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1.
Fatemeh Sadat Razavi Morteza Hajizadeh-Oghaz Omid Amiri Maryam Sadat Morassaei Masoud Salavati-Niasari 《International Journal of Hydrogen Energy》2021,46(1):886-895
The study of the effect of different chelating agents in the Pechini method on the morphology has been a promising strategy that can be used for practical tuning of the nanoparticle's morphology and hence the electrochemical hydrogen storage capacity. In the current study, the conventional Pechini sol-gel approach was used to prepare the Ba2Co9O14 nanoparticles as a novel hydrogen storage material. The X-ray diffraction investigation approved the formation of Ba2Co9O14 with a Hexagonal crystal structure for all of the synthesized samples. The scanning electron microscopy (SEM) revealed when citric acid was used as a chelating agent, nanoparticles with finer and more uniform morphology were obtained rather than other chelating sources. The transmission electron microscopy (TEM) showed in the presence of citric acid; the size of the synthesized nanoparticles was between 14 and 24 nm. According to the Diffuse Reflectance Spectroscopy (DRS) analysis, the calculated bandgap of synthesized nanoparticles was approximately 3.2 eV, which indicates that synthesized nanoparticles were semiconductors in essence. The electrochemical hydrogen adsorption/desorption results showed that the sample synthesized by the citric acid has an enhancement in electrochemical hydrogen storage of approximately 800 mAh/g after 15 cycles. 相似文献
2.
《International Journal of Hydrogen Energy》2020,45(35):17662-17670
Barium cobalt oxide nanocomposites (Ba2Co9O14/Co3O4 NCs) as potential hydrogen storage material fabricated by sol-gel auto-combustion method using maltose as reductant, for the first time. Three different ratios of Ba:maltose were applied, including 1:5.5, 1:11 and 1:22 for morphological engineering. X-Ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FT-IR), along with Field Emission Scanning Electron Microscopy (FE-SEM) and Transmission electron microscopy (TEM) images was applied for study the composition and structure of as-prepared samples. Also, the magnetic, optical and electrochemical properties of optimum sample were inquired using VSM, DRS and CV techniques. The porosity and surface properties of NCs were checked by Brunauer-Emmett-Teller (BET) measurements. FE-SEM micrographs of all maltose assisted-synthesis products showed formation of hexagonal nanoparticles on the surfaces of the microplates. According to FE-SEM, HRTEM and XRD results, 1:22 ratio of Ba:maltose and calcination process of 900 °C for 4 h, was selected as optimum condition. The electrochemical hydrogen sorption capability of obtained Ba2Co9O14/Co3O4 NCs was studied according to chronopotentiometry charge-discharge procedures in KOH medium and performed 1100 mAh/g discharge capacity. Based on the obtained results, Ba2Co9O14/Co3O4 NCs can be promising compounds to improve the electrochemical performance of hydrogen storage. 相似文献
3.
《International Journal of Hydrogen Energy》2023,48(12):4762-4772
Green energies are vital for near-future energy needs. Hydrogen is a promising secondary energy career that counted as a clean-burning fuel. However, hydrogen suffers from a low volumetric energy density at ambient temperature and pressure. This deficiency has been overcome by “solid-state hydrogen storage” technologies, where the hydrogen is adsorbed/absorbed - depending on the type of materials - on a solid surface. Mixed metal oxides (MMOs) particularly transition-based metal oxides have been recently developed for hydrogen adsorption with a superior affinity for hydrogen. Here, we demonstrated two nanosized-MMOs based on (mono-) perovskite structure, Li2TiO3, and LaTiO3. These two MMOs are successfully synthesized via the auto-combustion method in the presence of starch fuel. After confirmation of their structures and morphologies, the samples are used for electrochemical hydrogen storage in an alkaline medium. The average particle diameters of Li2TiO3 and LaTiO3 are calculated to be around 16.74 and 24.46 nm, respectively. The results indicate a higher discharge capacity of LaTiO3 nanoperovskites (1140 mAh/g) as compared to Li2TiO3 nanoparticles (680 mAh/g); as confirmed primarily by cyclic voltammetry (CV), with the theoretical hydrogen capacities of 4.1% and 2.4%, respectively. We believe that novel MMOs can be potentially fulfilled the requirements of future energy targets, arranged and reported by US-department of energy (DOE). 相似文献
4.
《International Journal of Hydrogen Energy》2020,45(27):13805-13813
Hydrogen evolution reaction (HER) has been identified as a sustainable and environment friendly technology for a wide range of energy conversion and storage applications. The big barrier in realizing this green technology requires a highly efficient, earth-abundant, and low-cost electrocatalyst for HER. Various HER catalysts have been designed and reported, still, their performance is not up to the mark of Pt. Among them, cobalt-based, especially cobalt disulfide (CoS2) has shown significant HER activity and found suitable candidature for HER due to its low cost, simple to prepare, and exhibits good stability. Herein, we synthesized various nanostructured materials including pure CoS2, Co3O4 and their composites by wet chemical methods and found them active for HER. The scanning electron microscopy (SEM) has revealed a morphology of composite as a mixture of nanowires and round shape spherical nanoparticles with several microns in dimension. The X-ray diffraction (XRD) confirmed the cubic phase of CoS2 and cubic phase of Co3O4 in the composite materials. The chemical deposition of CoS2 onto Co3O4 has tailored the HER activity of CoS2@Co3O4 composite material. Two CoS2@Co3O4 composite materials were produced with varying amounts of Co3O4 and labeled as samples 1 and 2. The Co3O4 reduced the adsorption energy for hydrogen, decreased the aggregation of CoS2 and uplifted the stability of CoS2@Co3O4 a composite material in alkaline media. Sample 1 requires an overpotential of 320 mV to reach a current density of 10 mA/cm2 and it exhibits a Tafel slope of 42 mVdec−1which is the key indicator for the fast HER kinetics on sample 1. The sample 1 is highly durable for 50 h and also it has excellent stability. The electrochemical impedance spectroscopy (EIS) revealed a small charge transfer resistance of 28.81 Ohms for the sample 1 with high capacitance double-layer value of 0.81 mF. EIS has supported polarization and Tafel slope results. Based on the partial physical characterization and the electrochemical results, the as-obtained sample 1 (CoS2@Co3O4 composite material) will find potential applications in an extended range of energy conversion and storage devices owing to its low cost, high abundance, and excellent efficiency. 相似文献
5.
Zhe Zhao Xiuling Wang Shuai Tang Mojie Cheng Zhigang Shao 《International Journal of Hydrogen Energy》2021,46(50):25332-25340
Hydrogen production via solid oxide electrolysis cell (SOEC) is world widely concerned with the new energy revolution. The SOEC performance must be enhanced for the practical application. In this study we report a high-performance Ce0.9Co0.1O2-δ-LSM-YSZ (CC-LSM-YSZ) oxygen electrode, in which Ce0.9Co0.1O2-δ nanoparticles are loaded on LSM-YSZ scaffold and characterized by XRD, SEM, O2-TPD and H2-TPR. Under 50% absolute humidity (A.H), the cell with 1CC-LSM-YSZ, 2CC-LSM-YSZ, 3CC-LSM-YSZ and 4CC-LSM-YSZ oxygen electrode delivers a current density of 0.63, 0.94, 1.14 and 1.26A cm?2 at 1.3 V, which is 1.7, 2.5, 3.0 and 3.3 times higher than the blank LSM-YSZ cell, respectively. The hydrogen generation rate of the 4CC-LSM-YSZ cell is as high as 873 m L cm?2 h?1 under 70% A.H. The DRT results demonstrate the accelerated charge transfer reaction on LSM-YSZ-Ce0.9Co0.1O2-δ oxygen electrode. LSM-YSZ-Ce0.9Co0.1O2-δ has the potential for the application of oxygen electrode in SOEC technology. 相似文献
6.
《International Journal of Hydrogen Energy》2022,47(12):8145-8154
High-quality p-type semiconducting Co3O4 with mixed morphology of nanoparticles/nanorods are synthesized using a hydrothermal route for high response and selective hydrogen sulphide (H2S) sensor application. XRD and Raman studies revealed the crystal structure and molecular bonding for obtained Co3O4, respectively. The nanoparticles/nanorods-like structures were confirmed for Co3O4 using FESEM and TEM analysis. The EDS and XPS spectra analysis were carried out for elemental composition and chemical atomic states of Co3O4. The Co3O4 sensor is investigated for gas sensing properties in dynamic conditions. The sensor exhibited the highest selectivity towards H2S among various hydrogen-contained gases at 225 °C. The sensor revealed a high response of 357% and 44% for 100 and 10 ppm H2S gas concentrations, respectively. The Co3O4 sensor exhibited a systematic dynamic resistance response for 100–10 ppm range H2S gas. The excellent dynamic resistance repeatability of the sensor was shown towards 25 ppm H2S gas. The response of Co3O4 sensor was investigated at different operating temperatures and H2S concentrations. The sensor stability and H2S sensing mechanism for the Co3O4 sensor have been reported. Highly uniform and mixed nanostructures of Co3O4 can be the potential sensor material for real-time high-performance H2S sensor application. 相似文献
7.
《International Journal of Hydrogen Energy》2020,45(46):24312-24321
Developing high performance, good stability and noble-metal-free electrocatalysts for renewable hydrogen evolution reaction (HER) remain a substantial challenge. Herein, we introduce a novel facile one-step in-situ strategy through pyrolysis for the synthesis of Co2P nanoparticles encapsulated Boron, Nitrogen, and Phosphorous tri-doped carbon nanotubes (Co2P/BNP-CNTs). The synergetic effect between Co2P nanoparticles and heteroatom doped CNTs contributes to the remarkable HER performance. The Co2P/BNP-CNT-900 electrocatalyst shows a low overpotential of 133 mV at a current density of 10 mA cm−2 and a small Tafel slope of 90 mV dec−1 in 0.1 M KOH media. More importantly, the Co2P/BNP-CNT-900 electrocatalyst exhibits superior long-term stability in alkaline solution at −0.25 V versus Reversible Hydrogen Electrode (RHE) for 15 h and up to 1000 cycles with negligible performance loss. Overall, our works suggest a one-pot facile synthesis strategy for rational designing high-performance electrocatalysts with enhanced HER performance. 相似文献
8.
Two different Co–S compounds with enhanced hydrogen storage properties, Co9S8 and CoS2, were prepared by ball-milling mixtures of Co metal and S powder. X-ray diffractometry, scanning electron microscopy and transmission electron microscopy were used to show that specific molar ratios of Co:S and ball-milling speeds and times result in pure Co9S8 and CoS2, thus overcoming a long-standing inability to obtain pure Co–S compounds via ball-milling. A galvanostatic charge–discharge process and cyclic voltammetry measurements showed that the as-obtained Co9S8 and CoS2 nanoparticles have enhanced electrochemical hydrogen storage capacities of 1.79 and 1.57 wt% hydrogen, respectively, which are higher than those previously reported. In addition, based on the corresponding X-ray photoelectron spectroscopy and cyclic voltammetry measurements, a new electrochemical hydrogen storage mechanism for the two Co–S compounds was proposed and discussed. 相似文献
9.
Umair Aftab Aneela Tahira Alessandro Gradone Vittorio Morandi Muhammad Ishaq Abro Muhammad Moazam Baloch Adeel Liaquat Bhatti Ayman Nafady Alberto Vomiero Zafar Hussain Ibupoto 《International Journal of Hydrogen Energy》2021,46(13):9110-9122
For an active hydrogen gas generation through water dissociation, the sluggish oxygen evolution reaction (OER) kinetics due to large overpotential is a main hindrance. Herein, a simple approach is used to produce composite material based on TiO2/Co3O4 for efficient OER and overpotential is linearly reduced with increasing amount of TiO2. The scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) investigations reveal the wire like morphology of composite materials, formed by the self-assembly of nanoparticles. The titania nanoparticles were homogenously distributed on the larger Co3O4 nanoparticles. The powder x-ray diffraction revealed a tetragonal phase of TiO2 and the cubic phase of Co3O4 in the composite materials. Composite samples with increasing TiO2 content were obtained (18%, 33%, 41% and 65% wt.). Among the composites, cobalt oxide-titanium oxide with the highest TiO2 content (CT-20) possesses the lowest overpotential for OER with a Tafel slope of 60 mV dec?1 and an exchange current density of 2.98 × 10?3A/cm2. The CT-20 is highly durable for 45 h at different current densities of 10, 20 and 30 mA/cm2. Electrochemical impedance spectroscopy (EIS) confirmed the fast charge transport for the CT-20 sample, which potentially accelerated the OER kinetics. These results based on a two-step methodology for the synthesis of TiO2/Co3O4 material can be useful and interesting for various energy storage and energy conversion systems. 相似文献
10.
《International Journal of Hydrogen Energy》2020,45(20):11802-11813
Fe-, Ni- and Zn- doped La0·9Sr0·1CoO3 are prepared and a single-component solid oxide fuel cell composed of 30 wt% perovskite oxide and 70 wt% samarium-doped ceria (SDC)-(Li0·67Na0.33)2CO3 is fabricated and characterized. When doping with either Fe, Ni or Zn, most cations occupy the Co3+ sites. X-ray photoelectron spectroscopy and oxygen temperature-programmed desorption characterizations show that Zn-doped La0·9Sr0·1CoO3 exhibits notably high surface oxygen, causing higher catalytic activity for oxygen reduction reaction (ORR) than that of nondoped La0·9Sr0·1CoO3. Fe or Ni doping into La0·9Sr0·1CoO3 decreases surface oxygen, resulting in a lower catalytic activity toward ORR than La0·9Sr0·1CoO3. Furthermore, X-ray diffraction, temperature-programmed reduction and transmission electron microscopy characterizations prove that after reduction, Fe-doped La0·9Sr0·1CoO3 is reduced to Co0·72Fe0.28 alloy-oxide core-shell nanoparticles, resulting in a high catalytic activity for hydrogen oxygen reaction (HOR). However, NiCo2O4 are formed during the reduction of Ni-doped La0·9Sr0·1CoO3, exhibiting a low catalytic activity for the HOR. Similarly, the low catalytic activity of reduced Zn-doped La0·9Sr0·1CoO3 for the HOR is caused by the formation of ZnCo2O4. A single component fuel cell composed with Fe-doped La0·9Sr0·1CoO3-SDC-(Li0·67Na0.33)2CO3 exhibits the highest Pmax of 239.1 mW cm−2 at 700 °C with H2 as fuel, indicating that HOR processes are rate-determining steps. 相似文献
11.
《International Journal of Hydrogen Energy》2022,47(66):28645-28654
The introduction of catalyst on anode of solid oxide fuel cell (SOFC) has been an effective way to alleviate the carbon deposition when utilizing biogas as the fuel. A series of La0.6Sr0.4Co1-xNixO3-δ (x = 0, 0.2, 0.4, 0.6, 0.8) oxides are synthesized by sol-gel method and used as catalysts precursors for biogas dry reforming. The phase structure of La0.6Sr0.4Co1-xNixO3-δ oxides before and after reduction are characterized by X-ray diffraction (XRD). The texture properties, carbon deposition, CH4 and CO2 conversion rate of La0.6Sr0.4Co1-xNixO3-δ catalysts are evaluated and compared. The peak power density of 739 mW cm?2 is obtained by a commercial SOFC with La0.6Sr0.4Co0.4Ni0.6O3-δ catalyst at 850 °C when using a mixture of CH4: CO2 = 2:1 as fuel. This shows a great improvement from the cell without catalyst for internal dry reforming, which is attributed to the formation of NiCo alloy active species after reduction in H2 atmosphere. The results indicate the benefits of inhibiting the carbon deposition on Ni-based anode through introducing the La0.6Sr0.4Co0.4Ni0.6O3-δ catalyst precursor. Additionally, the dry reforming technology will also help to convert part of the exhaust heat into chemical energy and improve the efficiency of SOFC system with biogas fuel. 相似文献
12.
《International Journal of Hydrogen Energy》2022,47(74):31566-31574
Facing the energy crisis in the whole world, it is important to decompose water to obtain high-clean hydrogen energy. However, water splitting by electrocatalysis is suffering from high voltage and poor stability. Herein, we synthesize Co3V2O8 coral reef-like nanoparticles in a facile way, showing a low oxygen evolution reaction (OER) overpotential of 318 mV coupled with good stability, which is superior to commercial RuO2. Besides, the Co3V2O8 shows fast kinetics for hydrogen evolution reaction (HER) and small impedance. Furthermore, the Co3V2O8 nanoparticles are assembled in symmetric two-electrode system, which has a very low overall water splitting voltage of 1.50 V at 10 mA cm?2, this value surpasses the benchmark RuO2//Pt/C assembling and most of the other oxometalate-based electrocatalysts. This work provides a novel and facile way of preparing oxometalates nanomaterial electrocatalyst for hydrogen energy. 相似文献
13.
《International Journal of Hydrogen Energy》2020,45(3):2034-2043
Chemical looping has been proposed as an emerging technology for large-scale hydrogen storage with the advantages of high volumetric hydrogen storage density, environmental compatibility, and safety. However, to ensure sufficient redox activity, conventional oxygen carrier materials must be operated at a temperature higher than 800 °C, leading to the rapid deterioration on the storage capacity over several cycles. In this work, we report a ternary ferrite-spinel material Cu0.5Co0.5Fe2O4 for chemical looping hydrogen storage and production. The material exhibits high volumetric hydrogen storage density (65.58 g·L−1) and average hydrogen production rate (142 μmol·g−1·min−1) at 550 °C. The performance is maintained with negligible deactivation over repetitive redox cycles. The high performance can be attributed to the ability of Cu and Co to improve the reduction and the reversible phase change during the oxidation stage at moderate temperatures. The performance of the Cu0.5Co0.5Fe2O4 is comparable to the state-of-the-art Rh-FeOx containing rare earth metals, which enables its potential in industry application. 相似文献
14.
《International Journal of Hydrogen Energy》2022,47(1):16-29
The simple, reliable, and economical process of combustion is used to synthesize carbon loaded cobalt oxide (C–Co3O4) for hydrogen generation via NaBH4 hydrolysis. The effect of NaBH4 concentration, pH, and temperature of the solution on hydrogen generation is investigated in detail. C–Co3O4 exhibits zero order reaction kinetics with respect to NaBH4 concentration. A stable Hydrogen Generation Rate (HGR) is observed throughout the reaction in the temperature range of 300–315 K using C–Co3O4. It is found that 0.01 g of C–Co3O4 exhibited high reaction activity with a maximum HGR of 5430 ml min?1 g?1 for the optimal solution at 320 K. The activation energy is calculated to be 55.9 kJ mol?1 for hydrolysis of NaBH4 using C–Co3O4. The present study provides an economical method for the large-scale production of C–Co3O4 for hydrogen generation from NaBH4 hydrolysis, which can pave the way to commercialize hydrogen as a main source of fuel. 相似文献
15.
《International Journal of Hydrogen Energy》2022,47(8):5372-5379
Today, the reduction of fossil fuel resources and the increase of their destructive environmental effects are important challenges. One strategy to this problem is application of new sources of energy supply. Hydrogen can play an important role in future energy supplies due to its unique properties such as clean combustion and high energy content relative to mass. In addition, hydrogen is considered as a green energy because it can be produced from renewable sources and is not polluting. The most important issue in hydrogen as a fuel is its storage. Hydrogen must be stored reversibly in a completely safe manner as well as with high storage efficiencies. One of the best ways to store hydrogen is using of new nanostructured adsorbents. In this study, first strontium hexaferrite (SrFe12O19) nanostructures are synthesized by sol-gel auto-combustion method. Then, the samples structure is studied using various techniques. Furthermore, the nanostructures are used as hydrogen storage materials. Using electrochemical techniques, the hydrogen storage properties of the materials are investigated in alkaline media. The obtained electrochemical results show that the maximum hydrogen storage capacity of SrFe12O19 nanostructures is about 3100 mAh/g. 相似文献
16.
《International Journal of Hydrogen Energy》2021,46(68):33835-33848
Hydrogen is a promising candidate to substitute the fossil fuels. However, the efficient hydrogen storage technologies restrict the commercial applications. Developing new catalysts with high activity and selectivity is important for the dehydrogenation reaction in N-ethylcarbazole/dodecahydro-N-ethylcarbazole (NECZ/12H-NECZ) hydrogen storage system. In this work, a series of Pd-M/Al2O3 (M = Co, Ni and Cu) bimetallic catalysts are synthesized successfully and show good performance in the dehydrogenation reaction of 12H-NECZ than the commercial Pd/Al2O3 catalyst. The Pd1Co1/Al2O3 catalyst (Practical Pd content = 2.4136 wt%) showed the highest catalytic performance with 95.34% H2 release amount, TOF of 230.5 min−1 and 85.4% selectivity of NECZ. Combined with the characterization analysis, it can be proposed that the dehydrogenation performance of 12H-NECZ is dependent on the alloy phases, reasonable electronic structures and nanoparticle size of catalysts. The fine-tuned alloy degree and appropriate nanoparticle size of Pd1Co1/Al2O3 bring the 17.7% increase of H2 release amount and 99.5% increase of NECZ selectivity than those of Pd/Al2O3. For the bimetallic catalysts, the enhancement of selectivity of NECZ is mainly from the increase of the kinetic constant of rate-limiting step. 相似文献
17.
《International Journal of Hydrogen Energy》2020,45(7):4587-4595
An effective bi-functional electrocatalyst of Co3O4/Polypyrrole/Carbon (Co3O4/Ppy/C) nanocomposite was prepared through a simple dry chemical method and used to catalyze the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Three types of carbon support as Vulcan carbon, reduced graphite oxide (RGO) and multi-walled carbon nanotubes (MCNTs) were used to study the influence on electrochemical reactions. Spherical shaped Co3O4 nanoparticles with 8–10 nm was found uniformly distributed on Ppy/C composite, which were analyzed by X-ray diffraction and transmission electron microscopy techniques. Amongst, Co3O4/Ppy/MWCNT shows improved bifunctional electrocatalytic activity towards both OER and HER with relatively low over potential (340 mV vs. 490 mV at 10 mA cm−2) and Tafel slope (87 vs. 110 mV dec−1). In addition to that, MWCNT supported Co3O4/Ppy nanocomposite exhibits good electronic conductivity and electrochemical stability up to 2000 potential cycles. The results clearly indicate that the Co3O4/Ppy/MWCNT nanocomposite could be the promising bi-functional electrocatalyst for efficient water electrolysis. 相似文献
18.
《International Journal of Hydrogen Energy》2022,47(1):490-500
Co2B alloy was synthesized via the method of high temperature solid phase. Carbon fiber (CF) was prepared from cotton by calcination process. The addition of carbon fiber and Co3O4 improves corrosion resistance and charge transfer speed of the composite material electrode. The Rct value of Co2B + 1 wt.% CF was 360 mΩ, lower than the other composite electrode could reduce charge transfer resistance. The overall electrochemical performance of Co2B + 2 wt.% Co3O4 + 1 wt.% CF was best among all the electrodes, and its Cmax could reach 715.3 mAh/g. The high conductivity and multiple reaction sites provided by carbon fiber and the catalytic effect of Co3O4 may be the main reasons for the improvement of electrochemical performance, which enhance the kinetic performance of electrochemical reactions. The synergistic effect of carbon fiber and Co3O4 improves the electrochemical hydrogen storage properties of Co2B alloy. This work presents a simple and effective method to improve the electrochemical hydrogen storage performance of cobalt-boron alloys by adding transition metal oxides and carbon materials derived from biomass. 相似文献
19.
Peng Gao Ying Wang Shaoqiang Yang Yujin Chen Zhu Xue Longqiang Wang Guobao Li Yuzeng Sun 《International Journal of Hydrogen Energy》2012
Fullerene-like orthorhombic-structured Co3C nanoparticles have been synthesized by direct ball-milling of Co and graphene (GE) powders with different Co/GE weight ratios. Electrochemical measurements showed that the Co3C nanoparticles displayed excellent electrochemical hydrogen storage capacities and the maximum capacity reached 1415 mA h/g (5.176 wt% hydrogen) at room temperature and ambient pressure. The reaction mechanism and the reasons for the differences of the Co3C electrodes were also investigated. It was found that the quasi-reversible Co3CHx/Co3C reaction was dominant for all the Co3C electrodes. 相似文献
20.
Jing Chen Fengli Liang Lina Liu Sanping Jiang Bo Chi Jian Pu Jian Li 《Journal of power sources》2008,183(2):586-589
A nano-structured La0.8Sr0.2Co0.5Fe0.5O3 + Y2O3 doped ZrO2 (LSCF + YSZ) composite cathode was prepared by impregnation of a LSCF-containing solution into porous YSZ structure presintered on the YSZ electrolyte. The result shows that the LSCF phase was formed at 700 °C, forming a nano-structured, effective and functional LSCF + YSZ composite cathode that not only produces high triple phase boundaries for the O2 reduction reaction, but also provides a structurally stable interface between the LSCF and YSZ. The electrode polarization resistance for the O2 reduction reaction is from 0.539 to 0.047 Ω cm2 between 600 and 750 °C, indicating the promising potential the LSCF + YSZ as a high performance cathode for intermediate temperature solid oxide fuel cells. 相似文献