JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chenxi Wu,Huajun Lai,Feng Wang,Dianhui Wang,Weijiang Gan,Yulai She,Zhongmin Wang
V-based alloy membranes have huge potential for hydrogen separation and purification due to their higher hydrogen permeability , but suffer from hydrogen embrittlement . To address this matter, Pd and Fe have been chosen as alloying additions in V-based membranes to inhibit hydrogen embrittlement and maintain high hydrogen permeation performance based on the lattice-matching strategy. The phase structure, composition, microstructure and hydrogen permeation properties of V-Pd-Fe ternary alloy are investigated systematically, and the V-Fe and V-Pd binary alloys are presented for comparison. The results show that the prepared V-Pd-Fe ternary can match almost perfectly with pure V in lattice constants . Attributing to the lattice-matching strategy, the V-Pd-Fe ternary alloy exhibits more excellent hydrogen permeable properties than that of V-Fe and V-Pd binary alloys . The reduction of hydrogen embrittlement is ascribed to the lower hydrogen solubility that induced by the lattice distortion and electronegativity of Fe and Pd. Meanwhile, the manipulated lattice constant that parallel to pure V maintains high hydrogen permeation performance. Additionally, the designed ternary V 87.8 Pd 8 Fe 4.2 alloy exhibits exceptional long-term hydrogen permeation stability at 573 and 623 K, and hydrogen flux gradually decreases at 673 and 723 K is observed due to the interdiffusion between Pd film and V 87.8 Pd 8 Fe 4.2 substrate and defects in the Pd coating. This study offers new scenario and method for optimized hydrogen permeable properties and restrains hydrogen embrittlement in the alloy membrane.
研究领域:
材料科学
·
氢能与储能
·
金属膜分离技术
·
固态氢传输
·
合金设计
·
物理冶金学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Man Yang,Yuxiang Jiao,Jianglin Duan,Keying Wu,Hailiang Song,Shaodong Sun,Yujing Ren
Taking the background of the ambiguous role of oxophilic metal oxide in metal-acid bifunctional catalysts for the important field of tetrahydrofurfuryl alcohol (THFA) hydrogenolysis, a linear relationship between the W═O/W–OH content in sub-nano-Rh-supported WOx and 1,5-pentanediol (1,5-PeD) yields from THFA hydrogenolysis has been established. It reveals that the higher reduction temperature promotes the surface Rh/W ratio. Thus, hydrogen spillover is facilitated, leading to more surface W═O structures and thereby more in-situ-reduced W–OH generation. W–OH structures work as the active sites to provide in situ Brønsted acid, resulting in enhanced selective activation for secondary C–O bonds of THFA. This discovery reveals the unique role of the surface structure on oxophilic metal oxide in chemoselective hydrogenolysis of the secondary C–O bond in polyols.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Xi Senliang,Wang Xiaojun,Wu Dan,Hu Xingtao,Zhou Shixue,Yu Hao
Phosphotungstic acid (HPW) as a polyoxometalate was selected as the active component of the catalyst. The activated carbon supported different percentage of HPW catalysts were prepared by impregnation and were characterized by X-ray diffraction (XRD), nitrogen adsorption, Fourier transform infrared (FTIR), and scanning electron microscope (SEM). The results showed that the HPW retained the original Keggin structure after being supported on activated carbon, the specific surface of the HPW/C was much bigger than that of pure HPW. The catalytic performance of HPW/C in the hydrogen generation reaction by hydrolysis of sodium borohydride in seawater and in deionized water were studied. 2.5 wt.% HPW/C showed the fastest hydrolysis reaction rate and the biggest volume of hydrogen generated. As for hydrolysis of sodium borohydride, catalytic effect of HPW/C was better in seawater than in distilled water. HPW dispersed on activated carbon is a real promising catalytic system for the development of hydrogen generation by hydrolysis of NaBH4 in seawater.
研究领域:
化学
·
材料科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhi Zhang,Dongqiang Gao,Jiaguang Zheng,Ao Xia,Qingbo Zhang,Li Wang,Liuting Zhang
For solid-state hydrogen storage, Mg(BH 4 ) 2 has long been recognized as a promising material. However, its higher thermal stability is distant from conditions for practical application. Herein, it is effectively established that VF 4 nanoparticles anchored on 2D Mxene Ti 3 C 2 (VF 4 @Ti 3 C 2 ) have efficiently catalytic effects towards the hydrogen storage process of Mg(BH 4 ) 2 . The MBH-VF 4 @Ti 3 C 2 sample started releasing hydrogen at 90 °C, which was 182 °C and 55 °C lower than those of additive-free Mg(BH 4 ) 2 and MBH-20Ti 3 C 2 composites. Additionally, the MBH-20VF 4 @Ti 3 C 2 composite desorbed more than 8 wt% H 2 at 275 °C. The activation energies of dehydrogenation were reduced, and the improved reversibility of VF 4 @Ti 3 C 2 -doped Mg(BH 4 ) 2 was also discussed. According to microstructural study, the heterostructural VF 4 @Ti 3 C 2 interacted with Mg(BH 4 ) 2 to produce VH 2.01 and metallic Ti during re/dehydrogenation, which worked as active species to improve hydrogen storage performance in Mg(BH 4 ) 2 .
研究领域:
材料科学
·
能源存储
·
催化
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Chenxu Liu,Zeming Yuan,Wei Li,Tingting Zhai,Zhonggang Han,Xinfang Zhang
MgH 2 is widely considered a great potential solid hydrogen storage material along with hydrogen energy and is recognized as a kind of renewable energy. However, its poor hydrogen absorption and desorption kinetics and high thermodynamic stability limit its application. In this work, CeO 2 @NC (Nano-Carbon supported CeO 2 particles) nanosphere catalysts were synthesized by a one-step hydrothermal method, and the particle size of CeO 2 was about 7 nm and MgH 2 + x wt.% CeO 2 @NC ( x = 0, 2, 4, 6, 8) composites were prepared by ball milling. It was found that the generation of oxygen vacancy defects and the multivalent environment of carbon-supported Ce can play the role of hydrogen pump and synergistically catalyze MgH 2 . Adding a carbon layer prevents nano-effect generation to a certain extent, which makes H atoms diffuse rapidly. The results show that MgH 2 + 6 wt.% CeO 2 @NC can release 5.89 wt.% H 2 in 50 min at 593 K, and MgH 2 without catalyst can only release 0.31 wt.% H 2 . As the amount of catalyst added increases, the dehydrogenation activation energy of the composite material decreases by 31.11 kJ/mol H 2 . Through density functional theory calculation, it was found that the adsorption energy of the material increased by 1.21 eV after the addition of the catalyst, and the Fermi level of the density of states of the composite increased, which accelerated the electron transfer rate. This study can help workers catalytically modify the hydrogen storage performance of MgH 2 . Introducing oxygen vacancy defects in carbon-based supported multivalent transition metal oxide catalysts gives them a unique electronic structure and excellent catalytic activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Liu Yu-Kun,Pang Yu-Chen,Li Chao-Qun,Zhang Xiao-Yue,Hu Xue-Chun,Chen Wei,Yu Xue-Bin,Xia Guang-Lin
As a typical reactive composite hydrogen storage system, 2LiBH 4 –MgH 2 holds an ultrahigh hydrogen storage capacity of 11.5 wt%. However, it suffers from sluggish hydrogen storage kinetics due to the difficult nucleation of MgB 2 . Herein, amorphous VB 2 nanoparticles with an average size of approximately 32 nm are synthesized to enhance the hydrogen storage performance of 2LiBH 4 –MgH 2 composite. VB 2 , sharing the same hexagonal structure with MgB 2 with a d -value mismatch ratio of only 2.28%, could serve as effective nucleation sites for promoting the formation of MgB 2 . Theoretical calculations reveal that the introduction of VB 2 significantly reduces the binding energies of B and Mg, facilitating in situ nucleation of MgB 2 . As a result, after the introduction of VB 2 nanoparticles, complete hydrogen desorption of 9.23 wt% is achieved for 2LiBH 4 -MgH 2 within 2 h at 400 °C, which is 4 times shorter than the time required for pure 2LiBH 4 -MgH 2 , and no nucleation incubation period for hydrogen desorption is observed even at a low temperature of 380 °C. More importantly, a reversible capacity of 9.3 wt%, corresponding to a capacity retention of 100%, could be preserved after 10 cycles of hydrogen storage, demonstrating stable reversible hydrogen storage performance. This study provides a novel technological pathway for improving the reversible hydrogen storage performance of composite metal hydrides and offers significant insights into the development of high-performance hydrogen storage materials. Graphical
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 23
·14244-14252
·
IF 10.733
Zeyi Wang,Xuelian Zhang,Zhuanghe Ren,Yong Liu,Jianjiang Hu,Haiwen Li,Mingxia Gao,Hongge Pan,Yongfeng Liu
A novel 2D layered NbTiC solid-solution MXene was synthesized from its MAX phase via a wet chemical etching process. While ball milling the NbTiC MXene with MgH2, ultrafine bimetal NbTi nanocrystals were formed in situ with a grain size of 5 nm, which offer highly stable catalytic activity for the hydrogen storage reaction of MgH2. The MgH2-9 wt% NbTiC sample starts releasing hydrogen from 195 °C, which is 80 °C lower than that for the additive-free sample. At 250 °C, it releases approximately 5.8 wt% H2 within 30 min, and the fully dehydrogenated sample takes up 4.0 wt% H2 within 15 min even at 50 °C under 50 bar H2 pressure. DFT calculations reveal a charge transfer process from Ti atoms to Nb atoms in the NbTi cluster and a lower absolute value of the adsorption energy of H2 on NbTi. This would presumably benefit both the breakage of Mg–H bonding and the detachment of H2 from the NbTi surface, and consequently lead to good catalytic activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Energies
·
2024
·Vol. 17
·期 3
·646
·
IF 3
Osama A. Marzouk
Recently, worldwide, the attention being paid to hydrogen and its derivatives as alternative carbon-free (or low-carbon) options for the electricity sector, the transport sector, and the industry sector has increased. Several projects in the field of low-emission hydrogen production (particularly electrolysis-based green hydrogen) have either been constructed or analyzed for their feasibility. Despite the great ambitions announced by some nations with respect to becoming hubs for hydrogen production and export, some quantification of the levels at which hydrogen and its derived products are expected to penetrate the global energy system and its various demand sectors would be useful in order to judge the practicality and likelihood of these ambitions and future targets. The current study aims to summarize some of the expectations of the level at which hydrogen and its derivatives could spread into the global economy, under two possible future scenarios. The first future scenario corresponds to a business-as-usual (BAU) pathway, where the world proceeds with the same existing policies and targets related to emissions and low-carbon energy transition. This forms a lower bound for the level of the role of hydrogen and its penetration into the global energy system. The second future scenario corresponds to an emission-conscious pathway, where governments cooperate to implement the changes necessary to decarbonize the economy by 2050 in order to achieve net-zero emissions of carbon dioxide (carbon neutrality), and thus limit the rise in the global mean surface temperature to 1.5 °C by 2100 (compared to pre-industrial periods). This forms an upper bound for the level of the role of hydrogen and its penetration into the global energy system. The study utilizes the latest release of the annual comprehensive report WEO (World Energy Outlook—edition year 2023, the 26th edition) of the IEA (International Energy Agency), as well as the latest release of the annual comprehensive report WETO (World Energy Transitions Outlook—edition year 2023, the third edition) of the IRENA (International Renewable Energy Agency). For the IEA-WEO report, the business-as-usual situation is STEPS (Stated “Energy” Policies Scenario), and the emissions-conscious situation is NZE (Net-Zero Emissions by 2050). For the IRENA-WETO report, the business-as-usual situation is the PES (Planned Energy Scenario), and the emissions-conscious situation is the 1.5°C scenario. Through the results presented here, it becomes possible to infer a realistic range for the production and utilization of hydrogen and its derivatives in 2030 and 2050. In addition, the study enables the divergence between the models used in WEO and WETO to be estimated, by identifying the different predictions for similar variables under similar conditions. The study covers miscellaneous variables related to energy and emissions other than hydrogen, which are helpful in establishing a good view of how the world may look in 2030 and 2050. Some barriers (such as the uncompetitive levelized cost of electrolysis-based green hydrogen) and drivers (such as the German H2Global initiative) for the hydrogen economy are also discussed. The study finds that the large-scale utilization of hydrogen or its derivatives as a source of energy is highly uncertain, and it may be reached slowly, given more than two decades to mature. Despite this, electrolysis-based green hydrogen is expected to dominate the global hydrogen economy, with the annual global production of electrolysis-based green hydrogen expected to increase from 0 million tonnes in 2021 to between 22 million tonnes and 327 million tonnes (with electrolyzer capacity exceeding 5 terawatts) in 2050, depending on the commitment of policymakers toward decarbonization and energy transitions.
研究领域:
能源研究
·
环境科学
·
政策分析
✓ 已验证
DOI
高影响因子
Nanoscale
·
2024
·
IF 5.8
Lei Sun,Rong Sun,Jianjun Liu,Mengzhou Zhu,Xiaoqin Zhang,Dongliang Guo,Kangyong Yin,Zhiyun Zhuang,Xueqiong Zhu,Peng Xiao
MgH2 used in solid-state hydrogen storage still suffers from high thermal stability and slow hydrogen absorption–desorption kinetics. Here, we report a hybrid of MgH2–Ti3C2/graphene prepared through a facile wet chemical method followed by a ball-milling method. It was confirmed that the coupling of Ti3C2 and graphene possesses a synergistic effect on the hydrogen desorption and absorption reactions of MgH2/Mg. The initial temperature of MgH2–Ti3C2/graphene to desorb hydrogen was reduced to 169 °C significantly and it could desorb 6.8 wt% H2 within 6 min at a constant temperature of 300 °C. Moreover, the desorbed sample could start to absorb hydrogen at room temperature and achieve a capacity of 6.0 wt% when the temperature was gradually increased to 350 °C. These results are far superior to pristine MgH2, disclosing that the addition of two-dimensional Ti3C2/graphene is an efficient strategy to boost the hydrogen storage performance of MgH2.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Ziqiang Wang,Yile Wang,Hugang Zhang,Hongjie Yu,You Xu,Kai Deng,Hongjing Wang,Liang Wang
Glycolic acid is used as a high-value-added chemical in a wide range of biological, chemical, and medical applications, and current large-scale production of glycolic acid usually suffers from harsh synthesis conditions and low selectivity. In this work, we report the coproduction of glycolic acid and hydrogen by electroreforming ethylene glycol using palladium–copper hydrides with hyperbranched nanocrystals (PdCu-H HNCs) as highly active electrocatalysts. The anodic ethylene glycol oxidation reaction (EGOR) requires only a low overpotential of 0.808 V at 100 mA cm–2. In a two-electrode system, PdCu-H HNCs show a low voltage of 0.824 V at 100 mA cm–2 for continuous production of glycolic acid and H2, with maximum Faraday efficiencies of 93% and nearly 100%, respectively. This work highlights the concurrent production of high-value glycolic acid and hydrogen with low energy consumption using palladium hydride-based electrocatalysts.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Li Yuan,Xueqian Wang,Xiang Li,Jianhong Wang,Langlang Wang,Yiran Xiong,Yuhang Xiao,Ping Ning
The performance of FeOOH for the removal of hydrogen sulfide (H 2 S) has been widely investigated. However, the harsh conditions of use and the difficulty of regeneration limit its practical application. In this study, FeOOH was loaded on activated carbon (AC) by a hydrothermal method to obtain a series of XF-AC catalysts for the removal of H 2 S from blast furnace gas (BFG). Among these catalysts, 3F-AC exhibited a high penetrating sulfur capacity of 482.3 mg/g and good regeneration performance. It is noteworthy that the use of AC as the support induced the transformation of α-FeOOH crystals into amorphous FeOOH and affected their morphology, and uniformly dispersed nanoparticles rather than agglomerated acicular crystals appeared on the surface of AC. The presence of amorphous FeOOH modulated the basic sites and surface hydroxyl groups of the catalysts while generating hydroxyl radicals during the reaction, thus improving the adsorption and oxidation of H 2 S. More importantly, the structural properties (surface area and pore volume) of 3F-AC enhanced the storage capacity of elemental sulfur and reduced the formation of by-products. The cyclic catalytic role of Fe 3+ /Fe 2+ played an important role in the oxidation process. This work provides a simple and effective strategy for the design of BFG desulfurization catalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Chunli Wang,Na Yang,Dongxue Cai,Shu-Zhong Zhan,Kun Liu
The electrocatalytic processes of hydrogen evolution reaction and hydrogen oxidation reactions have emerged as global strategies to address critical environmental and energy challenges associated with fossil fuel consumption. To enhance electrocatalytic activity, we focus on the design of novel electrocatalysts based on first-row transition metal complexes. A new nickel complex [Ni(dppe)Cl 2 ] by the reaction of NiCl 2 with 1,2-bis(diphenylphosphino)ethane (dppe) were synthesized and characterized in our group. The structure of nickel complex was determined cryptographically. The electro-catalyze hydrogen evolution (HER) activity of complex Ni(dppe)Cl 2 in acetonitrile solution with acetic acid as proton and a neutral buffer (pH 7.0) medium was evaluated by controlled potential electrolysis, with a turnover frequency (TOF) of 155 and 366 (mol of H 2 /mol of cat/h), respectively. Notably, electrocatalytic activity towards hydrogen oxidation (HOR) in acetonitrile solvent using Ni(dppe)Cl 2 as a catalyst has also been studied, and the complex exhibits highly catalytic efficiency with a TOF of 0.77 s −1 . The above results indicate that the Ni complex can be act as promising electrocatalyst for HER and HOR.
研究领域:
化学
·
材料科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）