JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Haiqiang Bai,Biao Liu,Ling Kang,Yanhong Wang,Jing Bai,Santosh Kumar Verma,Yunhua Xu
The ability of magnesium-based hydrogen storage materials to store and release hydrogen is hampered by their relatively slow rates. To address this, Mg-x% Co (x = 5, 10, 15) magnesium-rich hydrogen storage alloys were fabricated using reactive ball milling. The resulting alloys were multiphase, composed of Mg, Co, MgCo₂, and Mg₂CoH₅, which provided nucleation sites and improved hydrogen uptake. The reduced particle size and surface microcracks and pores enhanced hydrogen diffusion. The Mg-15 %Co alloy had the ability to take in 4.72 wt% hydrogen in 1 min when the temperature was set at 350°C. Hydrogenation resulted in the formation of a biphasic structure composed of Mg₂CoH₅ and Mg₆Co₂H₁₁. This structure destabilized the Mg-H bond and improved the kinetics of hydrogen release. The hydrogen release capacity first increased and then decreased with Co content, with Mg-10 %Co showing the best performance. Due to the combined action of ball milling and Co catalysis, the Mg-10 %Co alloy had an activation energy for hydrogen release of 113.65 kJ/mol, making it the alloy with the lowest such activation energy in the set. Differential scanning calorimetry (DSC) analysis confirms that cobalt addition reduces the hydrogen release peak temperature of Mg by 16.58–29.67 °C, with the Mg-10 % Co alloy exhibiting peak temperatures of 410.72–425.53 °C, attributed to synergistic decomposition of MgH₂ with intermediate hydrides like Mg₂CoH₅ and Mg₆Co₂H₁₁. The findings of this study indicate that alloying Mg-based alloys with transition elements while performing ball milling is a practical method for enhancing their hydrogen storage and release kinetics.
研究领域:
材料科学
·
能源存储
·
纳米技术
·
合金工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Material Advances
·
2023
·
IF 12.9
Haixiang Huang,Jinting Chen,Tingting Xu,Yujie Lv,Bogu Liu,Bao Zhang,Jianguang Yuan,Ying Wu
Complex metal oxide catalysts greatly accelerate the hydrogen sorption rates in the magnesium hydride system. In this study, the graphene-supported Sc2O3/TiO2 catalyst is synthesized by means of a simple method, and a surprisingly synergetic effect of the Sc2O3-TiO2 cocatalyst on the hydrogen storage performance of MgH2 is observed. The MgH2-Sc2O3/TiO2@Gn composite starts to release hydrogen at 140 °C and reaches the peak dehydrogenation temperature at 239.9 °C. It absorbs 6.55 wt% of H2 in 1 min and desorbs 5.71 wt% of H2 in 10 min at 300 °C, showing excellent hydrogen absorption and desorption performance. Furthermore, with the decrease of the grain size and changes in the structure, the activity of the catalyst is greatly improved. The low-valent titanium and scandium and oxygen vacancies formed in the process of dehydrogenation facilitate hydrogen diffusion and electron transfer, and further improve the kinetic performance of the Mg/MgH2-Sc2O3/TiO2@Gn system. This study aims to provide insights into studying complex metal oxides as catalysts to improve hydrogen storage performance, and shed light on other catalysis-related research.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Weitao Shi,Feifan Hong,Renhuan Li,Ruolin Zhao,Sizhi Ding,Ziqi Liu,Peilin Qing,Yi Fan,Haizhen Liu,Jin Guo,Zhiqiang Lan
MgH 2 is a promising high-capacity solid hydrogen storage material. In this work, MnO 2 -doped Ti 3 C 2 (Ti 3 C 2 @MnO 2 ) was synthesized and used as a catalyst to improve the hydrogen storage performance of MgH 2 . We found that the dehydrogenated 10 wt% Ti 3 C 2 @MnO 2 -doped MgH 2 sample exhibited good hydrogen adsorption ability even at room temperature (30 °C), and could absorb 5.13 wt% of hydrogen in 400 s at 75 °C. The re‑hydrogenated Ti 3 C 2 @MnO 2 -doped MgH 2 sample started to release hydrogen at 182 °C and required 484 s to completely release hydrogen at 275 °C with a dehydrogenation capacity of 6.4 wt%. The Ti 3 C 2 @MnO 2 composite did not change the thermodynamic properties of MgH 2 . In the MgH 2 + Ti 3 C 2 @MnO 2 sample, Ti 3 C 2 , TiO 2 , MnO 2 , MnO, and Mn combined with MgH 2 to form Ti 3 C 2 /MgH 2 , TiO 2 /MgH 2 , MnO 2 /MgH 2 , MnO/MgH 2 , and Mn/MgH 2 multiphase interfaces, which improved the hydrogen storage performance of MgH 2 . The findings of this work may provide a new strategy for preparing novel and efficient catalysts for hydrogen storage applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Samuel Guemou,Fuying Wu,Pengzhou Chen,Jiaguang Zheng,Ting Bian,Danhong Shang,Alexei Pavlovich Levtsev,Liuting Zhang
Transition metal-based oxides have been proven to have a substantial catalytic influence on boosting the hydrogen sorption performance of MgH 2 . Herein, the catalytic action of Ni 6 MnO 8 @rGO nanocomposite in accelerating the hydrogen sorption properties of MgH 2 was investigated. The MgH 2 + 5 wt% Ni 6 MnO 8 @rGO composites began delivering H 2 at 218 °C, with about 2.7 wt%, 5.4 wt%, and 6.6 wt% H 2 released within 10 min at 265 °C, 275 °C, and 300 °C, respectively. For isothermal hydrogenation at 75 °C and 100 °C, the dehydrogenated MgH 2 + 5 wt% Ni 6 MnO 8 @rGO sample could absorb 1.0 wt% and 3.3 wt% H 2 in 30 min, respectively. Moreover, as compared to addition-free MgH 2 , the de/rehydrogenation activation energies for doped MgH 2 composites were lowered to 115 ± 11 kJ/mol and 38 ± 7 kJ/mol, and remarkable cyclic stability was reported after 20 cycles. Microstructure analysis revealed that the in-situ formed Mg 2 Ni/Mg 2 NiH 4 , Mn, MnO 2 , and reduced graphene oxide synergically enhanced the hydrogen de/absorption properties of the Mg/MgH 2 system.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Cenyu Yang,Chen Hu,Xiaoyu Wu,Yao Pang,Xiaofang Liu,Jianglan Shui
Metallic single-atom catalysts (SACs) have demonstrated high activity and potential in enhancing the hydrogen storage properties of MgH 2 . However, previous reports primarily focus on supported SACs, which often suffer from insufficient contact between single-atom active sites and hydrogen storage materials. In this study, the precursor Mo(CO) 6 is uniformly dispersed on the surface of MgH 2 via impregnation adsorption, leading to the formation of alloy-type Mo single atoms after hydrogenation/dehydrogenation activation. This alloy structure enables zero-distance contact between catalytic sites and the hydrogen storage material, facilitating electron exchange and hydrogen transfer between the Mo sites and MgH 2 . The MgH 2 loaded with Mo single atoms (Mo 1 -MgH 2 ) exhibits excellent hydrogen absorption and desorption properties, with the initial hydrogen release temperature lowered from 323 to 218 °C. At 250 °C, Mo 1 -MgH 2 absorbs over 6.77 wt% of hydrogen within 1 min and releases over 5.85 wt% within 4 h. During 10 cycles of hydrogenation and dehydrogenation reactions, Mo 1 -MgH 2 maintains nearly 100% capacity and shows stable kinetics. This work provides new insights into the design and fabrication of catalysts for hydrogen storage materials.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Xuansheng Wang,Muzi Liu,Tian Tian,Fang Liu,Jiali Wang,Jinping Li,Guang Liu
MgH₂ is recognized as one of the most promising solid hydrogen storage materials; however, its practical application is confined by sluggish kinetics and stable thermodynamics. In this study, fibrous VNbO₅ was synthesized via electrospinning and subsequently introduced into MgH₂ through ball milling technology to enhance hydrogen storage properties. The addition of 7 wt% VNbO₅ give rise to the obvious decline in the initial dehydrogenation temperature of MgH₂, from 322.2 °C to 200.2 °C. At 300 °C, the modified composite exhibited rapid dehydrogenation, releasing approximately 6.43 wt% hydrogen within 8.1 min. Moreover, the fully dehydrogenated sample demonstrated the ability to absorb hydrogen at room temperature and absorbed 6 wt% H₂ at 200 °C within 16 s. The desorption activation energy of the MgH₂-7 wt% VNbO₅ composite was determined to be 75.32 ± 1.44 kJ/mol, representing an approximate 48.1% reduction compared to the 145.25 ± 2.14 kJ/mol of pure MgH₂. Furthermore, the system possessed remarkable cyclic stability, retaining 95.5% of hydrogen storage amount after 20 cycles. During the reaction process, VNbO₅ decomposed into low-valence state active catalytic species, including Nb₂O₅, NbO, Nb, VO₂, and V. The in-situ generation of this multi-element, multi-valence chemical environment synergistically enhanced hydrogen storage performance of MgH₂.
研究领域:
材料科学
·
能源存储
✓ 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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Xin Zhang,Zhengyang Shen,Ni Jian,Jianjiang Hu,Fang Du,Jianhua Yao,Mingxia Gao,Yongfeng Liu,Hongge Pan
Herein, we demonstrate the successful preparation of a novel complex transition metal oxide (TiVO 3.5 ) by oxidizing a solid-solution MXene (Ti 0.5 V 0.5 ) 3 C 2 at 300 °C and its high activity as a catalyst precursor in the hydrogen storage reaction of MgH 2 . The prepared TiVO 3.5 inherits the layered morphology of its MXene precursor, but the layer surface becomes very coarse because of the presence of numerous nanoparticles . Adding a minor amount of TiVO 3.5 remarkably reduces the dehydrogenation and hydrogenation temperatures of MgH 2 and enhances the reaction kinetics. The 10 wt% TiVO 3.5 -containing sample exhibits optimal hydrogen storage properties, as it desorbs approximately 5.0 wt% H 2 in 10 min at 250 °C and re-absorbs 3.9 wt% H 2 in 5 s at 100 °C and under 50 bar of hydrogen pressure. The apparent activation energy is calculated to be approximately 62.4 kJ/mol for the MgH 2 -10 wt% TiVO 3.5 sample, representing a 59% reduction in comparison with pristine MgH 2 (153.8 kJ/mol), which reasonably explains the remarkably reduced dehydrogenation operating temperature. Metallic Ti and V are detected after ball milling with MgH 2 ; they are uniformly dispersed on the MgH 2 matrix and act as actual catalytic species for the improvement of the hydrogen storage properties of MgH 2 .
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jinhui Wang,Yuting Li,Quanhui Hou,Peng Jiang,Zhao Ding,Yonglian Xiong
Magnesium-based materials are favored by researchers because of their high hydrogen storage capacity, but they cannot be put to daily use because of their more demanding reaction conditions. Recently, the method to improve the hydrogen storage performance of MgH 2 by catalyst doping has been widely investigated. In this paper, Co 3 O 4 catalysts were prepared by homogeneous precipitation method. It was demonstrated that the Co 3 O 4 catalyst could effectively improve the hydrogen storage performance of MgH 2 . According to the experimental results, the dehydrogenation onset temperature of the MgH 2 +15 wt% Co 3 O 4 composite was about 200 °C, which was about 130 °C lower than that of pure MgH 2 , and the amount of dehydrogenation was 6.26 wt%. The dehydrogenation activation energy of the MgH 2 +15 wt% Co 3 O 4 composite was reduced to 89.13 kJ/mol, which was about 45.7% lower than that of pure MgH 2 . After complete dehydrogenation, the composites started to absorb hydrogen at 50 °C with 6.2 wt%, while the activation energy of reabsorption was also reduced to 47.97 kJ/mol. After 10 cycles of MgH 2 +15 wt% Co 3 O 4 composites, the hydrogen storage capacity of MgH 2 could still be maintained at 99%, which indicated that it had good cycling stability. It was confirmed by various characterizations that Co 3 O 4 was uniformly distributed on the MgH 2 matrix after ball milling . After the first reaction, Co 3 O 4 was converted to CoO, which was uniformly attached to the Mg/MgH 2 surface and stabilized during the cycling process, continuing to provide active sites for hydrogen.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2024
·
IF 24.4
Wenqiang Hu,Jiahe Zang,Qisen Wang,Siyuan Xiao,Jichao Zhang,Fang Fang,Zhongliang Ma,Dalin Sun,Yun Song
Magnesium hydride (MgH 2 ) is a promising hydrogen storage material for its high hydrogen capacity of 7.6 wt.%. However, the further application is severely hampered by the sluggish reaction kinetics and stable thermodynamics. Introducing catalysts is an effective method to improve the reaction rate, but the catalytic activity tends to decrease with an increasing number of reaction cycles, due to the highly reductive Mg and H species. Herein, the spring effect has been observed in the P doped Li 3 VO 4 , in which both V─P and V─V bonds undergo compression and elongation during hydrogen absorption and desorption, respectively. Such a unique self-regulation spring effect not only improves the reaction kinetics of MgH 2 , but also maintains the high activity of P doped Li 3 VO 4 , thereby ensuring the hydrogen capacity of MgH 2 even after 100 loops. This spring effect of chemical bonding, stretched-recovered-stretched with the motion between the highly reductive Mg and H species, will provide insight into catalyst design for hydrogen-related industries.
研究领域:
材料科学
·
能源存储与转换
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2024
·
IF 9
Xiaoming Li,Zeming Yuan,Zhenyang Li,Chenxu Liu,Tingting Zhai,Yanghuan Zhang,Tao Li
Magnesium metal and its hydride have the characteristics of high hydrogen storage capacity, which is suitable for storing hydrogen energy. In this paper, VS 2 /NC catalyst supported on nanosheet carbon was synthesized by hydrothermal method with organic matter as raw material, then the MgH 2 + x wt.% VS 2 /NC ( x = 0, 3, 6, 9) composites were prepared by ball milling with MgH 2 . The phase characterization of the composite material showed that the VS 2 and MgH 2 phases in the composite material remain stable during ball milling and subsequently, the hydrogen absorption/desorption cycle. There were V 4+ and V 2+ ions (an atomic ratio of 3.77:1) in the catalyst. At 593 K, the capacities of the composites were 5.71, 6.11, 5.62, and 5.33 wt.% H 2 , respectively. The time to reach the maximum hydrogen desorption capacity of 95% was 190, 30, 20, and 23 min, respectively. The dehydrogenation activation energy of the material with x = 6 is reduced by nearly 50 kJ/mol H 2 . The initial dehydrogenation temperature of the material decreases to 323 K. Because of the valence state transition between V ions, the band gap of the composite material is narrowed, which significantly improves the hydrogen absorption and desorption reaction kinetics.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 41
·19900-19908
·
IF 3.925
Hongwei Qiu,Xingbo Han,Shuyan Zang,Wei Liu,Guo Yang,Lijun Lv,Xiaofeng Wang,Jiaqi Duan,Shuangyu Wang
The MgH2–LiH composites with different composition ratios were prepared by different ball milling times, and the hydrogen generation performances of the composites were investigated and compared. X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy techniques were adopted to elucidate the performance improvement mechanisms. The results show that the hydrogen generation yield and kinetics can be improved with the increase of LiH content significantly. For the 7MgH2–3LiH and 1MgH2–1LiH, with the increase of the ball milling time, the hydrogen yield increases firstly, and then decreases, but the kinetics almost do not change. This may be caused by the change of particle size of the composites after ball milling. However, for the 9MgH2–1LiH, the hydrogen yield increases with ball milling time but the kinetics decrease gradually. This may be due to the gradual movement of LiH from the surface to the interior of MgH2 and to the covering of MgH2 after ball milling.
研究领域:
材料科学
·
无机化学
·
能源化学
·
纳米材料
·
储氢材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）