共查询到20条相似文献,搜索用时 13 毫秒
1.
Yaqiong Gong Hailong Pan Zhoufeng Xu Zhi Yang Yu Lin Jinlei Wang 《International Journal of Hydrogen Energy》2018,43(36):17259-17264
Great efforts in developing low-cost, highly efficient and stable electrocatalysts are to tune the chemical compositions and morphological characteristics for enhancing efficiency of water splitting. In this communication, FeCo2S4 nanosheet was grown in situ on nickel foam (FeCo2S4/NF) via a facile hydrothermal sulfidization method and served as a high-efficient bifunctional electrocatalyst for overall water splitting. As-synthesized FeCo2S4/NF self-supported electrode delivers 20 mA cm?2 at an overpotential of 259 mV toward OER and 10 mA cm?2 at an overpotential of 131 mV toward HER in alkaline media. Moreover, when used as both anode and cathode in a two-electrode electrolyzer, only a small cell voltage of 1.541 V is needed to afford a current density of 10 mA cm?2 for overall water splitting. Bifunctional electrode FeCo2S4/NF also revealed a distinguished electrochemical durability during a 12 h stability test at 1.63 V, which would provide a promising water splitting installation for commercial hydrogen production. 相似文献
2.
《International Journal of Hydrogen Energy》2019,44(44):24237-24245
Despite great efforts have been made during the past decade to improve the efficiency of hydrogen evolution reaction (HER) onto the MoS2-based electrocatalysts via increasing the number of active sites, further improvements are crucial to avoid the detachment of 2D MoS2 nanosheets from the substrate during the long-term water splitting under intense HER. In this study, we report on the formation of highly efficient and surprisingly stable layer composed of 2D nanoplatelets from the hybrid-type MoS2 as a new prospective electrocatalyst for HER from acidic water solution. This layer was formed via one-pot hydrothermal synthesis in the solution containing ammonium heptamolybdate, thiourea and glycine (Gly). The products obtained were characterized by SEM, HRTEM, XRD, Raman, XPS, and potential cycling. Note that at the designed hybrid-type MoS2/MoO3-Gly nanoplatelets the HER rate can achieve a stable electrochemical performance for days with ~100 mA cm−2 current density at −0.35 V potential vs RHE. 相似文献
3.
《International Journal of Hydrogen Energy》2020,45(55):30611-30621
Electrocatalytic water splitting is identified as one of the most promising solutions to energy crisis. The CoSe2@NiSe2 materials were first prepared and in situ grown on nickel foam by typical hydrothermal and selenification process at 120 °C. The results show that the CoSe2@NiSe2 material used as the 3D substrates electrode can maximize the synergy between the CoSe2 and NiSe2, and also exhibits high efficiency of water splitting reaction. The lower overpotential of only 235 mV is presented to attain 20 mA cm−2 compared to the benchmark of RuO2 electrodes (270 mV @ 20 mA cm−2). Besides, the CoSe2@NiSe2 material also shows a remarkable improved hydrogen evolution reaction activity compared to NiSe2 (192 mV@10 mA cm−2) and Co precursor catalysts (208 mV@10 mA cm−2) individually, which a low overpotential of only 162 mV is achieved at 10 mA cm−2. The CoSe2@NiSe2 catalysts exhibit excellent water splitting performance (cell voltage of 1.50 V@ 10 mA cm−2) under alkaline conditions. It was proved that the high water splitting performance of the catalyst is attributed to high electrochemical activity area and synergistic effect. The work offers new ideas for the exploitation of synergistic catalysis of composite catalysts and adds new examples for the exploitation of efficient, better and relatively non-toxic electrocatalysts. 相似文献
4.
Electrocatalytic water splitting, as an ideal technology in renewable energy applications, suffers from high electrical energy consumption due to the slow kinetics of HER and OER reactions. Therefore, it is urgent to design efficient bifunctional catalysts to improve the reaction kinetics. Herein, a self-supported electrode, anchoring CoP nanoparticles on N-doped carbon/graphene (NC-G) and chemically growing on Ni foam as a whole electrode (denoted as NC-G-CoP/NF) displays promising electrocatalytic performance in 1.0 M KOH electrolyte, with a low overpotentials of 68 mV at 10 mA cm?2 for HER and 255 mV at 50 mA cm?2 for OER. This bifunctional electrocatalyst only needs 1.435 V to generate 10 mA cm?2 for overall water splitting. The outstanding electrocatalytic performance is ascribed to the following factors: i) inherent nature of transition metal phosphides, ii) abundant and high dispersion N active sites in NC-G, iii) strong interaction between the NC-G and CoP nanoparticles, and iv) rapid electron transfer between the catalytic centers and Nickle foam. This provides a new perspective to design efficient electrocatalysts for electrocatalytic water splitting. 相似文献
5.
《International Journal of Hydrogen Energy》2022,47(13):8165-8176
Herein, strongly coupled Ni3S2/MoS2 hollow spheres derived from NiMo-based bimetal-organic frameworks are successfully synthesized for overall water splitting via a one-pot solvothermal method followed by sulfurization. A well-defined hollow spherical structure with a heterointerface between Ni3S2 and MoS2 is constructed using solvothermal and sulfurization processes. Owing to their bimetallic heterostructure, porous hollow carbon structure with large surface area, and numerous exposed active sites, the Ni3S2/MoS2 hollow spheres are found to be efficient electrocatalysts for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The heterostructured Ni3S2/MoS2 hollow spheres show small overpotentials of 303 and 166 mV to reach a current density of 10 mA cm?2 for the OER and HER in 1.0 M KOH, respectively. Furthermore, an overall water-splitting electrolyzer consisting of the Ni3S2/MoS2 hollow spheres as both the anode and cathode requires a very low cell voltage of 1.62 V to drive a current density of 10 mA cm?2 with outstanding long-term stability for 100 h. Our findings offer a new pathway for the design and synthesis of electrochemically advanced bifunctional catalysts for various energy storage and conversion applications. 相似文献
6.
《International Journal of Hydrogen Energy》2022,47(35):15603-15611
A bifunctional electrocatalyst was fabricated by in-situ vertical growth of Ni(OH)2 nanosheets on nickel foam (NF), with subsequent accretion of nickel vacancy NiFe-LDHs (NivacFe-LDHs) by two step hydrothermal method. It was exhibited to be a high-efficiency overall water splitting performance with good stability. The low over-potentials of 292, 330, and 376 mV were acquired when the current density was selected as 50, 100, and 200 mA/cm2 for oxygen evolution reaction (OER) with a relatively low Tafel slope. It also achieved low over-potentials of 116 and 247 mV when the current densities were 10 and 200 mA/cm2 for hydrogen evolution reaction (HER), and Tafel slope was estimated to be 95.87 mV/dec. For the overall water splitting, NF–Ni(OH)2-NivacFe-LDHs needed only a low overpotential (291 mV) to achieve 25 mA/cm2 in 1 mol/L potassium hydroxide. The long-term testing of this electrode for 24 h chronopotentiometric test at 25 mA/cm2 demonstrated very eminent stability. 相似文献
7.
《International Journal of Hydrogen Energy》2022,47(3):1633-1643
The high-efficiency non-precious metal catalysts for oxygen evolution (OER) and hydrogen evolution (HER) are of great significance to the development of renewable energy technologies. Herein, a multiple active sites CoNi-MOFs-DBD electrocatalyst modified by low temperature plasma (DBD) was successfully synthesized by converting metal hydroxyfluoride on nickel foam into a well-arranged MOFs array using vapor deposition. The as-prepared CoNi-MOFs-DBD electrode showed better HER and OER catalytic activity, super hydrophilicity, and excellent stability. In an alkaline medium, the overpotential of HER is 203 mV at 10 mA cm?2 and that of OER is 168 mV at 40 mA cm?2. When CoNi-MOFs-DBD was used as a bifunctional electrocatalyst for overall water splitting in a two-electrode system, a current density of 10 mA cm?2 can be achieved at a low voltage of 1.42 V, which shows great potential in electrocatalytic water splitting. 相似文献
8.
《International Journal of Hydrogen Energy》2021,46(70):34713-34726
Electrocatalytic water splitting technology has become one of the most promising methods to solve the energy crisis, which can produce a large amount of high purity H2 and O2. It is necessary to develop efficient and stable water splitting catalyst for reducing the overpotential of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) and accelerating their reaction kinetics. A series of NiSe2@NixSy nanoarrays was firstly in situ grown on the nickel foam through the typical hydrothermal, selenylation and sulfuration pathways. The Na2SeO3 homogeneous solution is formed by hydrothermal and the selenization process is done at the temperature of 180。C. Then the nickel foam (NF) is put into the Na2SeO3 solution to form NiSe2 material at the temperature of 120。C. After that, the NiSe2 materials were sulfuretted with different amounts of sulfur to form NiSe2@NixSy hybrid materials. The experimental results demonstrate that the NiSe2@NixSy material as a 3D electrode can maximize the synergistic reaction between NiSe2 and NixSy, thus exhibiting an efficient and comprehensive water splitting performance. The NiSe2@NixSy-1 material presents a superior OER performance with requiring the overpotential of only 206 mV at 100 mA cm−2. Moreover, the NiSe2@NixSy-0.3 material presents a superior HER performance with requiring the overpotential of only 148 mV at 100 mA cm−2. It is worth noting that when NiSe2@NixSy-1 material and the NiSe2@NixSy-0.3 material was used as cathode and anode, only 1.53 V cell voltage is needed to produce a current density of 10 mA cm−2 throughout the water splitting process, which is one of the smallest values reported so far. Density functional theory calculations results show that the Ni3S2 has the best water adsorption energy, so it is an active species in the process of catalysis. However, NiSe2 has more density distribution around the Fermi level, indicating that it exhibits better metallic properties, which makes the NiSe2@NixSy-1 hybrid material exhibit better electronic conductivity. 相似文献
9.
《International Journal of Hydrogen Energy》2022,47(25):12629-12641
Electrochemical water splitting technique requires high-efficient bifunctional electrocatalysts to obtain large-scale hydrogen production for resolving the impending energy and environmental crisis. Herein, hierarchical flower-like CoS2-MoS2 heterostructure hybrid spheres grown on carbon cloth (CoS2-MoS2/CC) were prepared by sulfuring wheel-shaped polyoxometalate {Co20Mo16}. The as-prepared CoS2-MoS2/CC as bifunctional electrocatalyst manifests excellent alkaline oxygen evolution and hydrogen evolution activities with low overpotentials of 240 mV for OER and 60 mV for HER at 10 mA cm?2, respectively. When assembled as two-electrode cell, CoS2-MoS2/CC delivers an extremely low cell-voltage of 1.52 V at 10 mA cm?2 accompanied with remarkable long-term durability. Additionally, CoS2-MoS2/CC exhibits favorable overall-water-splitting performance in simulated seawater. The superior performance of CoS2-MoS2/CC should be ascribed to the optimized intrinsic electron structure via electron transfer from MoS2 to CoS2 along with the synergistic effect of well-exposed heterostructure interfaces and favorable diffusion channels. This work offers a practical strategy for exploring high-efficient bifunctional electrocatalysts for overall water splitting. 相似文献
10.
Yanlong Shi Xiaojuan Feng Haiyu Guan Jiahua Zhang Zhongai Hu 《International Journal of Hydrogen Energy》2021,46(12):8557-8566
Constructing high-efficient and nonprecious electrocatalysts is of primary importance for improving the efficiency of water splitting. Herein, a novel sunflower plate-like NiFe2O4/CoNi–S nanosheet heterostructure was fabricated via facile hydrothermal and electrodeposition methods. The as-fabricated NiFe2O4/CoNi–S heterostructure array exhibits remarkable bifunctional catalytic activity and stability toward oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline media. It presents a small overpotential of 219 mV and 149 mV for OER and HER, respectively, to produce a current density of 10 mA cm?2. More significantly, when the obtained electrodes are used as both the cathode and anode in an electrolyzer, a voltage of 1.57 V is gained at 10 mA cm?2, with superior stability for 72 h. Such outstanding properties are ascribed to: the 3D porous network structure, which exposes more active sites and accelerates mass transfer and gas bubble emission; the high conductivity of CoNi–S, which provides faster charge transport and thus promotes the electrocatalytic reaction of the composites; and the effective interface engineering between NiFe2O4 (excellent performance for OER) and CoNi–S (high activity for HER), which leads to a shorter transport pathway and thus expedites electron transfer. This work provides a new strategy for designing efficient and inexpensive electrocatalysts for water splitting. 相似文献
11.
《International Journal of Hydrogen Energy》2021,46(58):29916-29925
The main factors limiting water splitting producing hydrogen production are overpotential, activity and persistence of electrocatalysts. Herein, a novel NixCo1-x(OH)2 coupled with NiFe amorphous compound array growing on nickel foam substrate (expressed as NixCo1-x(OH)2/NiFe-AM) was developed by facile hydrothermal and electrodeposition methods. Significantly, NixCo1-x(OH)2/NiFe-AM with this unique structural exhibits superior activity and stability in the two half reactions of water electrolysis. In addition, when tested in an alkaline electrolyte with a current density of 10 mA cm−2, the overpotentials of HER and OER was 157 mV and 196 mV (60 mA cm−2), respectively. The stability can up to 60 h. These test results show through constructing hierarchical nano-thron architecture enhanced electrocatalytic activity to produce hydrogen and oxygen. 相似文献
12.
《International Journal of Hydrogen Energy》2023,48(33):12354-12363
Searching for efficient, stable and low-cost nonprecious catalysts for oxygen and hydrogen evolution reactions (OER and HER) is highly desired in overall water splitting (OWS). Herein, presented is a nickel foam (NF)-supported MoS2/NiFeS2 heterostructure, as an efficient electrocatalyst for OER, HER and OWS. The MoS2/NiFeS2/NF catalyst achieves a 500 mA cm−2 current density at a small overpotential of 303 mV for OER, and 228 mV for HER. Assembled as an electrolyzer for OWS, such a MoS2/NiFeS2/NF heterostructure catalyst shows a quite low cell voltage (≈1.79 V) at 500 mA cm−2, which is among the best values of current non-noble metal electrocatalysts. Even at the extremely large current density of 1000 mA cm−2, the MoS2/NiFeS2/NF catalyst presents low overpotentials of 314 and 253 mV for OER and HER, respectively. Furthermore, MoS2/NiFeS2/NF shows a ceaseless durability over 25 h with almost no change in the cell voltage. The superior catalytic activity and stability at large current densities (>500 mA cm−2) far exceed the benchmark RuO2 and Pt/C catalysts. This work sheds a new light on the development of highly active and stable nonprecious electrocatalysts for industrial water electrolysis. 相似文献
13.
Xiaoqiang Du Wenzhen Lian Xiaoshuang Zhang 《International Journal of Hydrogen Energy》2018,43(45):20627-20635
Exploring low-cost and highly efficient Water splitting electrocatalyst has been recognized as one of the most challenging and promising ways. NiCo2S4 core-shell nanorods supported on nickel foam (NF) have been fabricated by a facile hydrothermal method. The electrochemical performance of NiCo2S4@NiCo2S4 for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is studied. NiCo2S4@NiCo2S4/NF exhibits a significantly improved OER and HER performance with an overpotential of 200 mV at 40 mA/cm2 and an overpotential of 190 mV at 10 mA/cm2. The combination of low charge-transfer resistance, enhanced interaction and charge transport as well as large electrochemical double-layer capacitance enables superior OER and HER. The NiCo2S4@NiCo2S4/NF nanorod electrode shows excellent electrocatalytic activity with a low voltage 1.57 V and stability with long hour electrolysis, which is highly satisfactory for a prospective bifunctional electrocatalyst. 相似文献
14.
Yuepeng Liu Shuo Zhao Yanyun Wang Liying Xie Jiasheng Fang Yiwei Zhang Yuming Zhou Shuping Zhuo 《International Journal of Hydrogen Energy》2021,46(49):25004-25014
Modifying the texture of carbon nitride to adjust its physicochemical performance is a fascinating method for achieving high photocatalytic activity. Herein, we synthesized 3D porous carbon nitride with ultra-thin nanosheets by using cyanuric acid-melamine supramolecular and ionic liquid as precursor and template, respectively. The ionic liquid adjusts the morphology of materials and induces the carbon residue into the porous channels owing to its incomplete degradation. The 3D porous framework makes carbon nitride reflect the enhanced surface area, exposes adequate reaction sites, and offers a pathway for charge transport. And carbon residue and ultra-thin nanosheets further promote the photogenerated carriers transport and reduce the recombination rate of charge carriers. Consequently, 3D porous carbon nitride with ultra-thin nanosheets exhibit outstanding and stable hydrogen evolution under visible light irradiation. Significantly, as-fabricated sample CN-100 reflects an improved H2 generation rate, up to 17,028 μmol h?1 g?1, which is 12 times higher than that of CN (1412 μmol h?1 g?1). The present work offers a unique synthesis strategy to develop the novel photocatalyst with efficient photocatalytic performance. 相似文献
15.
Jinhui Tong Chunyan Li Lili Bo Xiaolin Guan Yunxia Wang Deyuan Kong Huan Wang Wenping Shi Yuning Zhang 《International Journal of Hydrogen Energy》2021,46(5):3354-3364
Fabrication of multicomponent materials is the most effective strategy to develop high-performance multifunctional catalysts. In this work, a series of bimetallic Fe–Co chalcogenophosphates were facilely prepared and used as bifunctional water electrolysis catalysts. The results have shown that the obtained catalysts showed high performances for hydrogen and oxygen evolution reactions, and overall water splitting. For the optimum catalyst, only 260 and 365 mV of overpotential for HER and OER, and 1.59 V of cell voltage for water splitting was needed respectively in 1 M KOH when 10 mA cm?2 of current density was reached. High stability and Faraday efficiency were also obtained, and the obtained results confirm that the catalyst is competitive in application in water electrolysis. 相似文献
16.
《International Journal of Hydrogen Energy》2019,44(5):2883-2888
One of the most promising ways to produce high purity hydrogen is electrocatalytic water splitting, the slow rate of oxygen evolution reaction (OER) limited the whole water splitting process under alkaline conditions. Here, NiCo2O4@NiWO4/NF is firstly acted as a metal tungstate dominated bifunctional water splitting catalyst, which a very low cell voltage of 1.59 V is obtained with 10 mA cm−2 in alkaline media. Remarkably, the catalytic performance of NiCo2O4@NiWO4/NF is also kept for at least 12 h, which shows long time electrochemical stability. 相似文献
17.
《International Journal of Hydrogen Energy》2019,44(12):5983-5989
The development of bifunctional catalysts that can be applied to both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is widely regarded as a key factor in the production of sustainable hydrogen fuel by electrochemical water splitting. In this work, we present a high-performance electrocatalyst based on nickel-cobalt metal-organic frameworks for overall water splitting. The as-obtained catalyst shows low overpotential to reaches the current density of 10 mA cm−2 with 249 mV for OER and 143 mV for HER in alkaline media, respectively. More importantly, when the electrolyzer was assembled with the as-prepared catalyst as anode and cathode simultaneously, it demonstrates excellent activity just applies a potential of 1.68 V to achieve 10 mA cm−2 current density for overall water splitting. 相似文献
18.
Noor-Ul-Ain Babar Yasir Faheem Joya Hassan Khalil Fayyaz Hussain Khurram Saleem Joya 《International Journal of Hydrogen Energy》2021,46(11):7885-7902
Developing only Fe derived bifunctional overall water splitting electrocatalyst both for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) while performing at low onset overpotential and with high catalytic stability is a rare instance. We present here the first demonstration of unique iron-oxide nanobeads (FeOx-NBs) based electrocatalyst executing both OER and HER with high activity. Thin-film electrocatalytic FeOx-NBs assembly is surface grown via simple spray coating (SC). The unique SC/FeOx-NBs propels OER initiating water oxidation just at 1.49 VRHE (η = 260 mV) that is the lowest observable onset potential for OER on simple Fe-oxide based catalytic films reported so far. Catalyst also reveals decently high HER activity and competent overall water splitting performance in the FeOx-NBs two-electrode system as well. Catalyst also presents stable kinetics, with promising high electrochemically active surface area (ECSA) of 1765 cm2, notable Tafel slopes of just 54 mV dec1? (OER) and 85 mV dec1? (HER), high exchange current density of 1.10 mA cm2? (OER), 0.58 mA cm2? (HER) and TOF of 74.29s1?@1.58VRHE, 262s1?@1.62VRHE (OER) and 82.5s1?@-0.45VRHE, 681s1?@-0.56VRHE (HER). 相似文献
19.
《International Journal of Hydrogen Energy》2022,47(13):8303-8313
Developing an effective and low-cost bifunctional electrocatalyst for both OER and HER to achieve overall water splitting is remaining a challenge to meet the needs of sustainable development. Herein, an electroless plating method was employed to autogenous growth of ultrathin Ni–Fe2B nanosheet arrays on nickel foam (NF), in which the whole liquid phase reduction reaction took no more than 20 min and did not require any other treatments such as calcination. In 1.0 M KOH electrolyte, the resulted Ni–Fe2B ultrathin nanosheet displayed a low overpotential of 250 mV for OER and 115 mV for HER to deliver a current density of 10 mA cm?2, and both OER and HER activities remained stable after 26 h stability testing. Further, the couple electrodes composed of Ni–Fe2B could afford a current density of 10 mA cm?2 towards overall water splitting at a cell voltage of 1.64 V in 1.0 M KOH and along with excellent stability for 26 h. The outstanding electrocatalytic activities can be attributed to the synergistic effect of electron-coupling across Ni and Fe atoms and active sites exposed by large surface area. The effective combination of low cost and high electrocatalytic activity brings about a promising prospect for Ni–Fe2B nanosheet arrays in the field of overall water splitting. 相似文献
20.
Xin Q. Shen Kun Xiang Xian-Zhu Fu Jing-Li Luo 《International Journal of Hydrogen Energy》2021,46(7):5398-5402
Efficient non-noble metal catalysts are desirable to greatly improve the efficiency of anodic oxygen evolution and cathodic hydrogen evolution reactions. Herein, iron-nickel/carbon nanotube composites are synthesized as efficient bifunctional electrocatalysts for water splitting. The catalyst is homogeneously distributed, while the formation of iron-nickel alloy is confirmed. Because of the synergism of iron and copper and the contribution of carbon nanotubes, the Fe–Ni/CNT electrocatalyst shows excellent oxygen evolution reaction performance with the overpotential of 221 mV at 10 mA cm?2 and maintains stable at 0.48 V for 150 h. It expedites overall water splitting at 10 mA cm?2 with 1.50 V and show excellent stability at 20 mA cm?2 for 65 h, providing great potential for large-scale applications. 相似文献