SOLID STATE SCIENCES
·
2019
·
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Jianxun Zhao,Xiaojie Zhai,Xing Tao,Heng Liu,Wanqiang Liu,Dayong Jiang,Shang Gao
Mechanical alloying technique was used to prepare the Co 0.9 Cu 0.1 Si alloy. Composite materials of Co 0.9 Cu 0.1 Si doping with different amounts of multi-walled carbon nanotubes (MWCNTs) or lithium modified MWCNTs (Li-MWCNTs) were obtained via ball-milling to improve the hydrogen storage performance of Co 0.9 Cu 0.1 Si. XRD , SEM and TEM were used to analysis the structural properties of the samples. A three-electrode battery system was carried out to test the electrochemical properties . After the addition of MWCNTs, the composites showed higher discharge capacity, stronger HRD, better cyclic stability and lower charge-transfer resistance than the original Co 0.9 Cu 0.1 Si alloy. The electro-catalytic function of MWCNTs, the reduction of particle size and the raise of specific surface area for Co 0.9 Cu 0.1 Si alloy may provide larger electrochemically accessible area and rapid channel for hydrogen transportation , which are important to enhance the electrochemical performance of the alloy. Moreover, a further improvement was achieved after the addition of Li-MWCNTs, illustrating that the MWCNTs and lithium species had synergistic effects in improving the discharge capacity and reaction kinetics of the Co 0.9 Cu 0.1 Si alloy electrode. As the weight ratio of the alloy and Li-MWCNTs was 15:1, the optimal discharge capacity of 624.4 mAh/g and the highest capacity retention of 67.5% were achieved.
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
Journal of Energy Storage
·
2023
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IF 9.4
Wenhao Fan,Jianxun Zhao,Dayong Liu,Qingcheng Liang,Wanqiang Liu,Xin Guo,Qingshuang Wang,Heng Liu,Peng Chen,Shang Gao,Yong Cheng,Xinwei Wang
The current hydrogen storage alloys used for Ni-MH battery negative electrode are difficult to guarantee excellent performance in terms of discharge capacity and cycle stability. Co 0.9 Cu 0.1 Si alloy has been widely investigated as a negative electrode material for nickel hydrogen battery, but its capacity and cycle stability need to be improved for commercial applications. In this work, Co 0.9 Cu 0.1 Si alloy was prepared by mechanical alloying. Molybdenum carbide (Mo 2 C) was loaded on multi-walled carbon nanotubes (MWCNTs) by in-situ carburizing . In order to improve the electrochemical hydrogen storage performance of Co 0.9 Cu 0.1 Si alloy, 5 wt% MWCNTs, Mo 2 C and molybdenum carbide modified multi-walled carbon nanotubes (Mo 2 C@MWCNTs) were added to Co 0.9 Cu 0.1 Si alloy via mechanical alloying method. The structure and morphology of the composites were characterized by XRD and SEM. The discharge capacity, cyclic stability and high rate discharge performance of the composites were tested, the electrochemical performance of the composites was investigated by three-electrode battery system. The composite materials have better discharge capacity, cycle stability and electrochemical performance compared with the pristine alloy. The Co 0.9 Cu 0.1 Si alloy doped with 5 wt% Mo 2 C@MWCNTs-2 has the best electrochemical hydrogen storage performance among all the composite materials. Its optimal discharge capacity is 609.9 mAh/g and its maximum capacity retention rate is 64.7 %. The enhancement of the electrochemical hydrogen storage performances of the composites are due to the high conductivity and high specific surface area of MWCNTs and the high catalytic activity of Mo 2 C. The synergistic effect of MWCNTs and Mo 2 C can improve the electrochemical hydrogen storage performances of the composites.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
·
IF 4.3
Jianxun Zhao,Wenhao Fan,Wanqiang Liu,Lianshan Sun,Yuhai Wang,Heng Liu,Peng Chen,Qingcheng Liang,Yong Cheng,Xinwei Wang
The Co 0.9 Cu 0.1 Si alloy was prepared using the mechanical alloying method, while CeO 2 and Ni-CeO 2 were synthesized through the hydrothermal method. Various mass ratios of CeO 2 and Ni-CeO 2 were incorporated into the Co 0.9 Cu 0.1 Si alloy via the mechanical alloying process. The electrochemical test results demonstrated a significant enhancement in hydrogen storage performance compared to that of the original Co 0.9 Cu 0.1 Si alloy. In our experiment, the samples with identical doping ratios revealed that the composite material doped with Ni-CeO 2 exhibited superior electrochemical hydrogen storage performance compared to its counterpart solely doped with CeO 2 .When Ni-CeO 2 was doped in the composite material at a ratio of 20:1, the sample demonstrated exceptional electrochemical hydrogen storage performance. At a discharge current of 25 mA/g, the discharge capacity reached 606.7 mAh/g, and after 50 cycles, the capacity retention rate was measured at 63.4%. Furthermore, its corrosion resistance and exchange current density surpassed those of other samples. The multifarious origins underlying these outcomes are rooted in a multitude of factors. Primarily, nickel engenders this phenomenon through its provision of high specific capacitance, exceptional reversibility, and enhanced electrical conductivity. Additionally, the introduction of nickel into the CeO 2 lattice creates vacancies that enhance hydrogen adsorption and facilitate charge transfer processes. Furthermore, CeO 2 and Ni-CeO 2 form the protective layer for the alloy, preventing dissolution of its constituents on the surface while improving resistance against fragmentation and corrosion. The findings of this investigation support the idea that incorporating transition metal oxides doped with metallic impurities into hydrogen storage alloys can improve their electrochemical performance and kinetic attributes, while also strengthening their resistance to corrosive influences.
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
Acta Metallurgica Sinica-English Letters
·
2023
·Vol. 36
·期 6
·1023-1037
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IF 3.5
Fan Wenhao,Zhao Jianxun,Liu Dayong,Liang Qingcheng,Liu Wanqiang,Wang Qingshuang,Liu Heng,Chen Peng,Gao Shang,Bao Xinlong,Cheng Yong,Wang Xinwei,Guo Xin
Co 0.9 Cu 0.1 Si alloy was prepared by mechanical alloying method. Nitrogen-doped graphene (NG) and nitrogen–sulfur co-doped graphene (NSG) were prepared by hydrothermal method. 5 wt% graphene oxide, NG and NSG were doped into Co 0.9 Cu 0.1 Si alloy, respectively, by ball milling to improve the electrochemical hydrogen storage performance of the composite material. X-ray diffraction and scanning electron microscopy were used to characterize the structure and morphology of the composite material, and the LAND battery test system and three-electrode battery system were used to test the electrochemical performance of the composite material. The composite material showed better discharge capacity and better cycle stability than the pristine alloy. In addition, in order to study the optimal ratio of NSG, 3%, 5%, 7% and 10% of NSG were doped into Co 0.9 Cu 0.1 Si alloy, respectively. Co 0.9 Cu 0.1 Si alloy doped with 5% NSG had the best performance among all the samples. The best discharge capacity was 580.1 mAh/g, and its highest capacity retention rate was 64.1%. The improvement in electrochemical hydrogen storage performance can be attributed to two aspects. On the one hand, the electrocatalytic performance of graphene is improved by co-doping nitrogen and sulfur, on the other hand, graphene has excellent electrical conductivity.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Rui Zhang,Jianxun Zhao,Wanqiang Liu,Lianshan Sun,Qingcheng Liang,Peng Chen,Xinwei Wang
Mechanical alloying is used to prepare Co 0.9 Cu 0.1 Si hydrogen storage alloy. Coral-like polyaniline (PANI) and NiO nanoparticles (NiO NPs) are synthesized separately. In order to improve the electrochemical properties of the alloy, polyaniline, NiO NPs and graphene oxide (GO) are doped into the alloy via mechanical alloying to form a composite. The composite material doped with PANI, NiO NPs and GO ultimately demonstrates superior discharge capability compared to the pristine alloy, establishing it as the most high-performing among all samples. The sample doped with both PANI or NiO NPs and GO exhibited superior discharge capacity and HRD performance compared to the sample containing only GO. The Co 0.9 Cu 0.1 Si + PANI/NiO NPs/GO electrode not only demonstrates a remarkable maximum discharge capacity of 590.82 mAh/g, but it also boasts an impressive highest exchange current density of 180.5 mA/g, alongside a notable cycle stability of 61.1 %. The enhancement of electrochemical activity and kinetic performance in alloys is attributed to the synergistic effect exerted by PANI, NiO NPs and GO. GO itself has a high specific surface area and good conductivity, which is conducive to the transfer of hydrogen inside the alloy and enhance the hydrogen storage performance of the alloy. Polyaniline participate in the reversible redox reaction and remain stable during the charge/discharge cycle, which promoted the surface anodizing process of the alloy. The NiO NPs catalyst can effectively weaken the O H bond, facilitating the dissociation of adsorbed water. These factors work together to significantly improve the overall electrochemical hydrogen storage performance of the alloy.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2025
·
IF 4.9
Jianxun Zhao,Wenhao Fan,Wanqiang Liu,Qingcheng Liang,Peng Chen,Yong Cheng
Co 0.9 Cu 0.1 Si alloy was synthesized by mechanical alloying. Nitrogen-doped reduced graphene oxide (N-rGO), cobalt-doped reduced graphene oxide (Co-rGO), and cobalt-nitrogen co-doped reduced graphene oxide (Co-N-rGO) were successfully synthesized via a hydrothermal method and subsequently coated with alloy nanoparticles, to enhance the electrochemical hydrogen storage capabilities of composite materials. In comparison to the pristine alloy, the composite material exhibits superior discharge specific capacity, cycling stability, and kinetic performance. The Co-N@rGO coated sample demonstrates superior electrochemical performance compared to all other coated rGO composites. The results indicate that the optimal addition ratio of Co-N@rGO is 5 wt.%. At this ratio, the battery achieves a maximum discharge capacity of 603.3 mAh/g. After 50 cycles, the capacity retention rate is 64.6% of the initial maximum discharge capacity. The significant enhancement in the electrochemical energy storage performance of the composite materials can be primarily attributed to the synergistic effects of nitrogen doping, cobalt doping, and the intrinsic properties of reduced graphene oxide (rGO). rGO enhanced the electrical conductivity of the composite material, thereby improving the efficiency of charge transfer during electrochemical reactions. Nitrogen doping improved the wettability of the rGO surface with the electrolyte and generated numerous active sites for hydrogen adsorption, significantly enhancing the electrocatalytic performance of rGO. Cobalt deposition on rGO further increased the electrical conductivity of the composite, promoted hydrogen atom adsorption, and accelerated hydrogen diffusion. The integration of rGO with nitrogen doping and cobalt incorporation demonstrated a strong synergistic effect, significantly further enhancing the kinetic characteristics of the electrochemical reactions.
研究领域:
材料科学
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储能技术
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电化学
·
纳米复合材料
·
氢能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）