共查询到20条相似文献,搜索用时 31 毫秒
1.
Yifan Luo Chao Zhang Bingbing Zheng Xin Geng Marc Debliquy 《International Journal of Hydrogen Energy》2017,42(31):20386-20397
With the exhaustion of traditional energy, increasing attention has been paid on the new energy resources like H2. Because of its inflammable and explosive properties, it is imperative and challenging to detect ppm-level H2 during the transport and use process. This paper firstly introduces the working principles and sensing mechanism of the hydrogen sensors based on noble metal doped metal-oxide semiconductors. Then, this paper focuses on the advancement of noble metal doped metal oxide hydrogen sensors, especially the room temperature hydrogen sensors, in the recent years. At the end, we propose that fabricating semiconductors with special morphologies, using two different noble metals for bimetallic doping or composite semiconductors with 2D nanomaterials like graphene/MoS2 to improve the room temperature sensing properties towards low H2 concentration should be the emphasis for the future work. 相似文献
2.
《International Journal of Hydrogen Energy》2020,45(27):13777-13788
The efforts on energy system decarbonization and improved sustainable energy efficiency in developed countries led energy enthusiasts to explore alternative highly effective pathways in accomplishing these goals. Specifically, the transition from hydrocarbon to H2 economy using fuel cells and H2 technologies is a sustainable and favorable approach forward in meeting stationary, transportation, industrial, residential, and commercial sectors. This review in three Parts brings out the capability of H2 for enabling an energy revolution through much-needed flexibility in renewable energy resources. The review identifies the developments and challenges within the H2 generation, storage, transportation, distribution, and usage - as well as applications along with national and international initiatives in the field, all of which suggest a pathway for a greener H2 society. The review also highlights the opportunities and challenges in major energy sectors for H2 technologies. Part I of the series highlights the importance of H2 economy and initiatives from various agencies, and presents several H2 generation methods. 相似文献
3.
《International Journal of Hydrogen Energy》2022,47(88):37264-37281
The hydrogen (H2) economy has been recognized globally from a socio-economic, and environmental viewpoint. Hydrogen can be produced using technologies such as electrolysis, thermochemical, photoelectrochemical, and biological methods. Biological methods help in waste management and energy production simultaneously. To make the biohydrogen process economic and viable at a commercial scale there is a need to utilize renewable raw materials efficiently. Improved reactor designs and advanced genetic improvements using metabolic pathways developments are mandated to improve microbial adaptation to the harsh process conditions. Finally, this review aimed to fill the void among technical and applied research and review the current advances in genetic engineering and metabolic pathway developments to improve H2 productivity. 相似文献
4.
《International Journal of Hydrogen Energy》2020,45(3):2418-2428
The monitoring and classification of different gases, such as H2 and NH3 using a low-cost resistive semiconductor sensor is preferred in practical applications in hydrogen energy, breath analysis, air pollution monitoring, industrial control, and etc. Herein, porous bi-layer Pt/SnO2 thin film sensors were fabricated to enhance H2 and NH3 sensing performance for effective monitoring and classification. Different Pt film thicknesses of 2, 5, 10, and 20 nm were deposited on 150 nm SnO2 film-based sensors by sputtering method to optimize the response to H2 and NH3 gases. Gas sensing results showed that the fabricated Pt/SnO2 films significantly improved the sensor response to NH3 and H2 compared to pure SnO2 thin film. The sensors based on 5 and 10 nm Pt catalyst layers presented the highest responses to H2 and NH3, respectively. The optimal working temperature for NH3 was in the range from 250 °C to 350 °C, and that for H2 gas is less than 200 °C. The response of Pt/SnO2 sensors to CH4, CO, H2S, and liquefied petroleum gas was much lower than that to NH3 and H2 supporting the high selectivity. On the basis of sensing results at different working temperatures or Pt thicknesses, we applied a radar plot and linear discriminant analysis methods to distinguish NH3 and H2. The results showed that H2 and NH3 could be classified without any confusion with different Pt layer thicknesses at a working temperature of 250 °C. 相似文献
5.
《International Journal of Hydrogen Energy》2022,47(37):16398-16423
Recently, waste-generated nanomaterials have received a surge in consideration for energy production due to their excellent properties and eco-friendly effects. A plethora of literature has reported on the growing interest for the production of hydrogen (H2) by utilizing sunlight through water splitting and the recycling of bio-waste into organic catalysts. To the best of our knowledge, there has been no review on waste-derived nanocomposites for the production of H2. Herein, potential methods, modes of fabrication, and the efficacy of synthesized nanocomposites for H2 production have been highlighted. Distinct attention has been given to waste-generated nanocomposites, including a variety of graphene nanomaterials. Remarkable efforts have been made to fabricate biomass-derived nanomaterials and to optimize their reaction conditions and efficient use in energy production. Finally, future prospects and challenges in improving photocatalytic H2 production are also summarized. 相似文献
6.
《International Journal of Hydrogen Energy》2020,45(46):25054-25064
The current critical environmental pollution caused by the huge fossil fuel burning together with the increasingly scarce energy source has inspired much attention on the renewable clean hydrogen energy. Thus, the hydrogen storage materials are very vital for the hydrogen application and will be screened by the high-throughput computational screening procedure in this paper. Generally, metal-modified carbon (boron, nitrogen) nanomaterials can exhibit excellent hydrogen storage capacities. An effective procedure is designed to screen the potential metal decorated carbon (boron, nitrogen) hydrogen storage materials from the Materials Project database, which can be proved to be easily realized and reliable. Totally six ideal structures are obtained for hydrogen storage by considering the thermodynamic stability, the metal decorating, the theoretical hydrogen gravimetric density larger than 5.5 wt%, the PBE band gap smaller than 1.0 eV, and the two-dimensional structure restriction. Furthermore, the binding energy of the metal atom to the screened 2D materials, the average adsorption energy per H2 adsorbed by the metal, the density of states, the difference charge densities are calculated by the density functional method. We believe that our screening procedure can effectively and accurately search for hydrogen storage materials, which should be the theoretical basis for experimental researches. 相似文献
7.
Xiantao Luo Kaikai You Yongming Hu Shulin Yang Xumin Pan Zhao Wang Wanping Chen Haoshuang Gu 《International Journal of Hydrogen Energy》2017,42(12):8399-8405
In order to improve the hydrogen sensing of transition metal oxide nanomaterials at room temperature, MoO3 nanowire paper was prepared and used as a hydrogen sensing materials on substrate. In this paper, orthorhombic phase, ultra-long (~1 mm) MoO3 nanowires were synthesized through conventional hydrothermal method at 260 °C for 96 h. A flexible nanowires paper with size of 200 mm × 300 mm was obtained by further self-assembly formation process of pure α-MoO3 nanowires in aqueous solution on hydrophobic substrate, and the thickness of paper can be controlled depend on the concentration of disperse nanowires. A novel hydrogen sensor with sensing area of 10 mm × 10 mm was obtained after Pt interdigital electrodes (IDE) deposited on the surface of α-MoO3 nanowires paper and transferred into ceramic circuit board (CCB) without any surface modification. The response and recovery time are about 3.0 and 2.7 s toward 1.5% H2, respectively. The sensors also show good selectivity toward H2 against other reduce gas, such as C2H5OH, CO and CH4. Large amounts of the porous structures and high specific surface of nanowires paper is beneficial to the absorption of oxygen molecules, which would lead to the high sensitivity, fast response and recovery speed of sensor at room temperature. MoO3 nanowires paper sensors have excellent stability and reliability, which could work for 5.56 years at room temperature. 相似文献
8.
9.
《International Journal of Hydrogen Energy》2020,45(41):20693-20708
The goal of the review series on the H2 economy is to highlight the current status, major issues, and opportunities associated with H2 production, storage, transportation, distribution and usage in various energy sectors. In particular, Part I discussed the various H2 (grey and green) production methods including the futuristic ones such as photoelectrochemical for small, medium, and large-scale applications. Part II of the H2 economy review identifies the developments and challenges in the areas of H2 storage, transportation and distribution with national and international initiatives in the field, all of which suggest a pathway for establishing greener H2 society in the near future. Currently, various methods, comprising physical and chemical routes are being explored with a focus on improving the H2 storage density, capacity, and reducing the cost. H2 transportation methods by road, through pipelines, and via ocean are pursued actively in expanding the market for large scale applications around the world. As of now, compressed H2 and its transportation by road is the most realistic option for the transportation sector. 相似文献
10.
《International Journal of Hydrogen Energy》2023,48(46):17729-17741
Hydrogen sensors able to perform measurements in real time in anaerobic environment such as natural gas (NG) will greatly help the development of power to gas technology. For now, thermal conductivity (TC) gas sensors and Pd thin film based sensors have demonstrated their capability to measure H2 in air and N2 but there is still lack of testing in natural gas environment. In this study, the sensing performances (response, hysteresis, response time and selectivity) of two sensors were assessed in three anaerobic environments: N2, CH4, and NG. The first one is a homemade resistive sensor based on a PdAu thin film and the second one is a commercial thermal conductivity sensor. While most performances are equivalent for both technologies, only the PdAu sensor is able to detect selectively H2, without any interfering effect with NG components. Thus, Pd based thin film sensors are promising for H2 detection in anaerobic environments. 相似文献
11.
Sehar Tasleem Muhammad Tahir Wesam Alsayeh Khalifa 《International Journal of Hydrogen Energy》2021,46(27):14148-14189
Photocatalytic H2 generation using semiconductor photocatalysts is considered as a cost-effective and eco-friendly technology for solar to energy conversion; however, the present photocatalysts have been recognized to depict low efficiency. Currently, porous coordination polymers known as metal-organic frameworks (MOFs) constituting flexible and modifiable porous structure and having excess active sites are considered to be appropriate for photocatalytic H2 production. This review highlights current progress in structural development of MOF materials along with modification strategies for enhanced photoactivity. Initially, the review discusses the photocatalytic H2 production mechanism with the concepts of thermodynamics and mass transfer with particular focus on MOFs. Elaboration of the structural categories of MOFs into Type I, Type II, Type III and classification of MOFs for H2 generation into transition metal based, post-transition metal based, noble-metal based and hetero-metal based has been systematically discussed. The review also critically deliberate various modification approaches of band engineering, improvement of charge separation, efficient irradiation utilization and overall efficiency of MOFs including metal modification, heterojunction formation, Z-scheme formation, by introducing electron mediator, and dye based composites. Also, the MOF synthesized derivatives for photocatalytic H2 generation are elaborated. Finally, future perspectives of MOFs for H2 generation and approaches for efficiency improvement have been suggested. 相似文献
12.
《International Journal of Hydrogen Energy》2023,48(75):29256-29294
Hydrogen-based economy has a great potential for addressing the world's environmental concerns by using hydrogen as its future energy carrier. Hydrogen can be stored in gaseous, liquid and solid-state form, but among all solid-state hydrogen storage materials (metal hydrides) have the highest energy density. However, hydrogen accessibility is a challenging step in metal hydride-based materials. To improve the hydrogen storage kinetics, effects of functionalized catalysts/dopants on metal atoms have been extensively studied. The nanostructuring of metal hydrides is a new focus and has enhanced hydrogen storage properties by allowing higher surface area and thus reversibility, hydrogen storage density, faster and tunable kinetics, lower absorption and desorption temperatures, and durability. The effect of incorporating nanoparticles of carbon-based materials (graphene, C60, carbon nanotubes (CNTs), carbon black, and carbon aerogel) showed improved hydrogen storage characteristics of metal hydrides. In this critical review, the effects of various carbon-based materials, catalysts, and dopants are summarized in terms of hydrogen-storage capacity and kinetics. This review also highlights the effects of carbon nanomaterials on metal hydrides along with advanced synthesis routes, and analysis techniques to explore the effects of encapsulated metal hydrides and carbon particles. In addition, effects of carbon composites in polymeric composites for improved hydrogen storage properties in solid-state forms, and new characterization techniques are also discussed. As is known, the nanomaterials have extremely higher surface area (100–1000 time more surface area in m2/g) when compared to the bulk scale materials; thus, hydrogen absorption and desorption can be tuned in nanoscale structures for various industrial applications. The nanoscale tailoring of metal hydrides with carbon materials is a promising strategy for the next generation of solid-state hydrogen storage systems for different industries. 相似文献
13.
《International Journal of Hydrogen Energy》2019,44(47):26076-26099
Being a clean source of energy, hydrogen gas is in high demand in various industrial and commercial applications. However, the explosive nature of H2 gas above 4% concentration makes it highly dangerous to store, transport and use. Further, the small size gas molecules of H2 are prone to leak through the smallest possible holes and cracks. Hence, the detection of H2 gas becomes essential even at trace levels. This article reviews various gas sensing strategies including methods, materials, and integrated systems available for the sensitive detection of H2 gas for a bunch of different applications. The article also reviews some approaches which are available in the literature to detect parts per billion (ppb) level of H2 gas concentrations. This review article aims at explaining the different aspects of H2 gas sensing technology in a simple yet exhaustive manner. 相似文献
14.
《International Journal of Hydrogen Energy》2022,47(59):24817-24834
As a response to climate change caused by a surge in greenhouse gas emissions and the associated transition to sustainable energy systems, hydrogen (H2) is considered as an attracting alternative energy source. In that context, water electrolysis combined with renewable energy source, so called green H2, has been recently receiving great attention from worldwide. However, for stable use of H2 as an energy source in various type of fuel cells to produce electricity, the purity of H2 must not only meet the required level but also be maintained stably. Among possible impurities in the produced H2 steam, oxygen (O2) must be controlled below certain level in any circumstances for safety, hence catalytic purification for intensive and selective removal of O2 in H2 steam is nowadays regarded as an essential technology for commercial application of green H2 because of the intermittent nature of renewable energy. Nevertheless, the catalytic purification technology, especially the technology for catalyst and process development, is still in the basic stage, and the reported technologies have not been systemically organized yet. Therefore, this review 1) briefly summarizes the developmental trends and current available technologies of various H2 purification technologies, such as membrane separation, pressure swing adsorption, metal hydride, and cryogenic separation 2) and introduces the developmental of deoxo catalysts and catalytic H2 purification technologies with future research perspectives and suggestions. 相似文献
15.
Zhong Li ZhengJun Yao Azhar Ali Haidry Tomas Plecenik LiJuan Xie LinChao Sun Qawareer Fatima 《International Journal of Hydrogen Energy》2018,43(45):21114-21132
Owing to its high energy density and environmentally friendly nature, hydrogen has already been regarded as the ultimate energy of the 21st century and gained significant attention from the worldwide researchers. Meanwhile, there are increasing concerns about its safe use, storage and transport as, despite being colorless and odorless, after certain concentration level it becomes flammable and explosive in air. Therefore, it is imperative to develop H2 sensors for real-time monitoring of the H2 leakage for an early warning. This paper firstly introduces the general hydrogen gas sensing mechanism of TiO2-based hydrogen sensors. Then we summarize and comment on the current hydrogen gas sensor based on various TiO2 materials, which include pristine TiO2, metal-assisted TiO2, organic-TiO2 composites, carbon-TiO2 composites, MOX-TiO2 composites and novel sensor concept with effective top-bottom electrode configuration. Finally, we briefly discuss the obstacles that TiO2-based H2 sensors have to overcome in the progress of the systematically practical application, possible solutions, and future research perspectives that can be focused in this area. 相似文献
16.
《International Journal of Hydrogen Energy》2022,47(97):41310-41319
The use of nanomaterials for hydrogen storage could play a very important role in the large-scale utilization of hydrogen as an energy source. However, nowadays several potential hydrogen storage nanomaterials do not have a large gravimetric density and stability at room temperature. In this work, we have investigated the hydrogen storage performances of Na-, K- and Ca-decorated B-doped siligene monolayer (BSiGeML) using density functional theory calculations. The results show that boron doping improves the interaction between the metal adatom and the siligene monolayer (SiGeML). The K- and Ca-decorated BSiGeMLs can bind up to seven H2 molecules per metal adatom, whereas Na-decorated BSiGeML only adsorb four H2 molecules per adsorption site. The effect of temperature and pressure on the hydrogen storage capacity of BSiGeMLs was also evaluated. At room temperature, all the H2 molecules adsorbed on Na-, and Ca-decorated BSiGeML are stable at mild pressure. The metal decoration of both sides of BSiGeML may lead to hydrogen gravimetric densities exceeding the target of 5.5 wt% proposed by DOE for the year 2025. K- and Ca-decorated BSiGeML could be efficient hydrogen molecular storage media compared to undoped SiGeML and other 2D pristine materials. 相似文献
17.
《International Journal of Hydrogen Energy》2022,47(15):9477-9483
The utilization of H2 for versatile application has demanded highly selective, low cost and rapid hydrogen sensors that are proficient in sensing H2 near flammability limit. In this report, CrIIICl2(pyrazine)2 MOF with negatively charged pyrazine linkers in its structure is used for the stabilization of Pd (II) via charge transfer interactions. This material design turned an innocent MOF into selective hydrogen sensor that can respond (through decrease in resistance under dynamic sensing setup) to H2 in 5–7 s with a detection range of 0.25%–1% H2 concentration. A correlation of H2 sensing characteristics and the structure-property relationship is established using density functional theory (DFT) calculations. The calculations suggested that near fermi level in PdII@CrPy, the bandwidth increases upon interaction with H2 thereby the phase space for electron delocalization increases leading to better carrier mobility. This new approach not only yields novel sensing properties but also enables limited usage of precious metal to develop cost-effective sensors. 相似文献
18.
Thi Thu Le Claudio Pistidda Van Huy Nguyen Pardeep Singh Pankaj Raizada Thomas Klassen Martin Dornheim 《International Journal of Hydrogen Energy》2021,46(46):23723-23736
To find a solution to efficiently exploit renewable energy sources is a key step to achieve complete independence from fossil fuel energy sources. Hydrogen is considered by many as a suitable energy vector for efficiently exploiting intermittent and unevenly distributed renewable energy sources. However, although the production of hydrogen from renewable energy sources is technically feasible, the storage of large quantities of hydrogen is challenging. Comparing to conventional compressed and cryogenic hydrogen storage, the solid-state storage of hydrogen shows many advantages in terms of safety and volumetric energy density. Among the materials available to store hydrogen, metal hydrides and complex metal hydrides have been extensively investigated due to their appealing hydrogen storage properties. Among several potentials candidates, magnesium hydride (MgH2) and lithium borohydride (LiBH4) have been widely recognized as promising solid-state hydrogen storage materials. However, before considering these hydrides ready for real-scale applications, the issue of their high thermodynamic stability and of their poor hydrogenation/dehydrogenation kinetics must be solved. An approach to modify the hydrogen storage properties of these hydrides is nanoconfinement. This review summarizes and discusses recent findings on the use of porous scaffolds as nanostructured tools for improving the thermodynamics and kinetics of MgH2 and LiBH4. 相似文献
19.
《International Journal of Hydrogen Energy》2022,47(7):4959-4969
Here, for the first time, we synthesize hybrid hydrophilic and hydrophobic nanocarbon materials with reliable and stable gas sensing performance. The hybrid monolayer graphene (Gr)–nitrogen and argon (N2 and Ar) gas incorporated ultra-nanocrystalline diamond (Gr/N2@UNCD and Gr/Ar@UNCD) structures were synthesized using a microwave plasma enhanced chemical vapor deposition (MPECVD) method. The presented nanohybrid combinations have a unique morphology with diamond defects (sp3) covered by a graphene sheet (sp2). Sample sensors with metal electrodes were fabricated to study the H2 gas sensing properties of the material. Thus, the as-fabricated Gr/N2@UNCD exhibited higher sensor response (14.6%) than those of the as-fabricated Gr, N-UNCD and Gr/Ar@UNCD (3.6, 1.07 and 11.2%) based devices. The Gr/N2@UNCD nanohybrid based sensor showed outstanding repeatability, selectivity and stability over ~56 days. The substantial improvement in the H2 sensing performance of the as-fabricated Gr/N2@UNCD nanohybrid based sensor was attributed to the modifications in surface morphology and resistance. The partial-hydrophobic surface of Gr/N2@UNCD alters the beneficial resistivity and improved absorption, which assists in the efficient transport of electrons and H2 gas molecules. The hybrid nanostructure of Gr-N2@UNCD exhibits several unique properties that paves the way to future opportunities for advanced gas sensor fabrication. 相似文献
20.
Boris P. Tarasov Pavel V. Fursikov Alexey A. Volodin Mikhail S. Bocharnikov Yustinas Ya Shimkus Aleksey M. Kashin Volodymyr A. Yartys Stanford Chidziva Sivakumar Pasupathi Mykhaylo V. Lototskyy 《International Journal of Hydrogen Energy》2021,46(25):13647-13657
Along with a brief overview of literature data on energy storage technologies utilising hydrogen and metal hydrides, this article presents results of the related R&D activities carried out by the authors. The focus is put on proper selection of metal hydride materials on the basis of AB5- and AB2-type intermetallic compounds for hydrogen storage and compression applications, based on the analysis of PCT properties of the materials in systems with H2 gas. The article also presents features of integrated energy storage systems utilising metal hydride hydrogen storage and compression, as well as their metal hydride based components developed at IPCP and HySA Systems. 相似文献