SOLID STATE SCIENCES
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2019
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IF 2.155
Jianxun Zhao,Xiangjun Zhou,Yalan Guo,Zhongmin Su,Heng Liu,Wanqiang Liu,Shang Gao
Co 0.9 Cu 0.1 Si alloy was fabricated via mechanical alloying technique. Different amount of palladium was doped into the Co 0.9 Cu 0.1 Si alloy by ball milling. The composite alloy combined the excellent electrocatalysis activity of Pd, exhibiting preferable electrochemical performance than the original alloy. The Co 0.9 Cu 0.1 Si + 5 wt% Pd composite showed a C max of 559.2 mAh/g, significantly higher than that for Co 0.9 Cu 0.1 Si (502.1 mAh/g). The cycle stability was also enhanced after Pd loading. Moreover, the effect of ball milling time on electrochemical performance for the composite alloy was also investigated. 5 wt% Pd was mixed with the Co 0.9 Cu 0.1 Si alloy at different ball milling time (0.5 h, 1 h, 2 h, 3 h and 5 h). The optimal discharge capacity, capacity retention and high-rate dischargeability were obtained under the ball milling time of 2 h. The studies on electrochemical reaction kinetics demonstrated that the addition of Pd could accelerate the charge-transfer, thus enhancing the electrochemical activity and reaction kinetics of the alloy. The results indicated that Pd loading was an effective way in enhancing the electrochemical performance of Co 0.9 Cu 0.1 Si alloy.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Metals
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2020
·Vol. 10
·期 12
·1574
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IF 2.117
Ruochen Shen,Chaohui Pu,Xiaoou Xu,Youpeng Xu,Zhilin Li,Zhu Wu
The research aims to study the effect of adding mischmetal (Mm) to the TiFe0.86Mn0.07Co0.07alloy on its hydrogen storage performance and cyclic stability. The results show that TiFe0.86Mn0.07Co0.07+ x% Mm (x = 0,4,6,8) alloys can be easily activated. The hydrogen absorption capacity of TiFe0.86Mn0.07Co0.07+ 4% Mm reaches 1.76 wt% (mass fraction) at 298 K. With the increase of Mm addition, the hydrogen storage capacity decreases slightly. Furthermore, after 40 absorption and desorption cycles in hydrogen containing 250 ppm O2, the alloy still has 36% of its initial hydrogen storage capacity, and the alloy can recover 93% of its hydrogen storage capacity through heat treatment.Keywords:TiFe hydrogen storage alloys;life test;impure hydrogen gas;cyclic stability
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2020
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IF 3.442
Hui Yong,Xin Wei,Yanhao Wang,Shihai Guo,Zeming Yuan,Yan Qi,Dongliang Zhao,Yanghuan Zhang
To improve hydrogen storage property of Mg-based alloy, the Mg–Ce–Y–Ni + 10 wt % M (M = Zr, Ti, V) composites were prepared by the combination of alloying and ball-milling, and their microstructure, phase evolution, as well as hydrogen storage thermodynamic and kinetic properties, were investigated by XRD , PCT, and DSC methods. The result shows that the hydrogenated samples are composed of MgH 2 , Mg 2 NiH 4 and corresponding ZrH 2 , TiH 2 and VH 1.9 phases. In comparison, the |Δ H| value of M = Ti sample is larger than that of M = Zr and M = V samples, and the M = Ti sample has the highest the peak temperatures and lowest plateau pressure, which indicates that Zr and V elements are more efficient to reduce the thermodynamic stability of RE-Mg-Ni hydrogen storage alloys. Besides, the DSC curve of the M = V sample has another endothermic peak which corresponds to the decomposition reaction between VH 1.9 and VH 0.8 , which has a contribution to desorption kinetic property for the M = V sample. The apparent activation energies ( E de ) show an increasing trend in the following order: M = Zr (87.7 kJ/mol) < M = V (89.1 kJ/mol) < M = Ti (99.3 kJ/mol).
研究领域:
材料科学
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
Materials for Renewable and Sustainable Energy
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2018
·Vol. 8
·期 1
·1-9
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IF 0
Jiang L.,Zou Z. W.,Pei Q. M.,Zheng D. S.,Li F. S.,Tian Y. H.
Re 2 Mg(Ni 0.7 − x Co 0.2 Mn 0.1 Al x ) 9 ( x = 0‒0.04) alloys are prepared by induction melting, and the influence of the partial substitution of Ni by Al on the structure, hydrogen storage, and electrochemical properties of the alloys are investigated systematically. These alloys mainly consist of two main phases with LaNi 5 phase and (La,Mg) 2 Ni 7 phase, and minor LaNi 2 phase. The pressure-composition isotherms shows that, with Al content increasing in the alloys, the maximum hydrogen storage capacity decreased from 1.16 wt% ( x = 0) to 0.99 wt% ( x = 0.04). The changes of enthalpy and entropy reveal that the thermodynamic stability and the disordered degree of the hydride alloys increase with the Al addition. Results of electrochemical studies indicate that the substitution of Al for Ni can noticeably improve the cycle stability of the alloy electrode. The capacity retention after 80 cycles is enhanced from 63.6% ( x = 0) to 76.5% ( x = 0.04). However, the maximum discharge capacity of the alloys decreases. The Re 2 Mg(Ni 0.7 − x Co 0.2 Mn 0.1 Al x ) 9 ( x = 0‒0.04) alloys exhibit excellent dischargeability.
研究领域:
材料科学
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氢能源研究
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产品关联
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Hui Yong,Shuai Wang,Jiangwei Ma,Kewei Zhang,Dongliang Zhao,Jifan Hu,Yanghuan Zhang
The Mg-based hydrogen storage alloy with multiple platforms is successfully prepared by ball milling Co powder and Mg-RE-Ni precursor alloy, and its hydrogen storage behavior was investigated in detail by XRD , EDS , TEM, PCI , and DSC methods. The ball-milled alloy consists of the main phase Mg, the catalytic phases Mg 2 Ni, Mg 2 Co as well as a small amount of Mg 12 Ce, and convert into the MgH 2 –CeH 2.73 -Mg 2 NiH 4 –Mg 2 CoH 5 composite after hydrogenation. The composite has three PCI platforms corresponding to the reversible de/hydrogenation reaction of Mg/MgH 2 , Mg 2 Ni/Mg 2 NiH 4 and Mg 6 Co 2 H 11 /Mg 2 CoH 5 . Among them, the transformation between Mg 2 Ni and Mg 2 NiH 4 triggers the “spill-over” effect which promote the decomposition of MgH 2 phases and enhances the hydrogen desorption kinetics. Meanwhile, the conversion of the Mg 6 Co 2 H 11 to Mg 2 CoH 5 phase induces the “chain reaction” effect, which leads to preferential nucleation of Mg phase and improves the hydrogen absorption kinetics. Therefore, the Mg-RE-Ni-Co alloy has a double improvement on hydrogen absorption and desorption kinetics. Concretely, the alloy has an optimal hydrogen absorption temperature of 200 °C, at which it can absorb 5.5 wt. % H 2 within 40 s. Under the conditions, the capacity of absorption almost reaches the maximum reversible value (about 5.6 wt. %). Besides, the alloy has a dehydrogenation activation energy of 67.9 kJ/mol and can desorb 5.0 wt. % H 2 within 60 min at the temperature of 260 °C.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Jiefei Ding,Xin Ding,Xinxiu Wang,Guanglong Li,Xianglong Meng,Yong Zhang,Ruirun Chen
The application of Mg-based hydrides in portable and stationary energy storage is primarily hindered by sluggish sorption kinetics and unfavorable cycle stability. Herein, an attempt is made to enhance the hydrogen storage properties of MgSc alloy by the addition of TiO 2 nanoparticles to regulate multivalent‑oxygen vacancy. The formation of Sc 2 O 3 and MgTi 2 O 4 phases during heat treatment act as active sites, facilitating hydrogen absorption in the initial stages. Notably, MgSc-TiO 2 demonstrates a rapid rate of de/hydrogenation. The absorption capacity in the first cycle is 6.5 wt%, and releases 6.3 wt% H 2 within just 5 min. TiO 2 doping significantly improves the kinetics and cycling stability of the hydrogen absorption and desorption reaction, achieving a reversible capacity of 6.14 wt% at 320 °C. After 10 cycles, the capacity remains 6.32 wt% without visible decay. The improvement is attributed to the solid solution effect of Sc, the multivalent of Ti, the acceleration of electron transfer by oxygen vacancies and the alleviation of volume expansion stress by MgTi 2 O 4 . Ti hydrides participate in the de/hydrogenation reaction. Additionally, multivalent Ti contributes to electron transfer between Mg 2+ and H − , thereby weakening the stability of Mg H bond. Oxygen vacancies enhance the absorption of hydrogen and accelerate H atoms diffusion.
研究领域:
材料科学
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能量存储
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纳米技术
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储氢合金
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物理化学
✓ 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）