采用铜模铸造法制备了V3TiNi0.56Co0.3钒基贮氢合金,并进行物相组成、显微组织、电化学腐蚀性能和电化学循环稳定性能的测试与对比分析。结果表明,铜模铸造制备的V3Ti Ni0.56Co0.3钒基贮氢合金为非晶合金,显著改善了合金的电化学腐蚀性...采用铜模铸造法制备了V3TiNi0.56Co0.3钒基贮氢合金,并进行物相组成、显微组织、电化学腐蚀性能和电化学循环稳定性能的测试与对比分析。结果表明,铜模铸造制备的V3Ti Ni0.56Co0.3钒基贮氢合金为非晶合金,显著改善了合金的电化学腐蚀性能和电化学循环稳定性能。与常规铸造相比,铜模铸造使其腐蚀电位正移389 m V、最大放电容量增大19.96%、充放电循环20次后的放电容量下降率从96.93%减小至40.22%。展开更多
为了有效提高铸态钒基固溶体储氢合金的电化学性能,分别采用三种不同的铸造工艺制备了V_3TiNi_(0.56_Sc_(0.1)钒基固溶体储氢合金铸态试样,并进行了显微组织观察以及电化学循环稳定性和电化学腐蚀性能的测试与分析。结果表明:与常规铸...为了有效提高铸态钒基固溶体储氢合金的电化学性能,分别采用三种不同的铸造工艺制备了V_3TiNi_(0.56_Sc_(0.1)钒基固溶体储氢合金铸态试样,并进行了显微组织观察以及电化学循环稳定性和电化学腐蚀性能的测试与分析。结果表明:与常规铸造法相比,静置辅助铸造法和双重辅助铸造法有利于改善合金的铸造质量,细化合金晶粒,提高合金的电化学循环稳定性和电化学腐蚀性能,且双重辅助铸造法效果更佳;静置辅助铸造法、双重辅助铸造法分别使放电容量衰减率减小47%、71%,分别使合金的腐蚀电位正移109、237 m V。展开更多
对添加不同含量Ti的Mg2Ni-Ti储氢合金进行了电化学腐蚀试验和电化学循环稳定性的测试与分析,结果表明:合金元素Ti的添加,有利于提高Mg2Ni合金的电化学腐蚀性能和电化学循环稳定性。合金中Ti含量以0.8%为宜。与不添加Ti的Mg2Ni储氢合金相...对添加不同含量Ti的Mg2Ni-Ti储氢合金进行了电化学腐蚀试验和电化学循环稳定性的测试与分析,结果表明:合金元素Ti的添加,有利于提高Mg2Ni合金的电化学腐蚀性能和电化学循环稳定性。合金中Ti含量以0.8%为宜。与不添加Ti的Mg2Ni储氢合金相比,添加0.8%Ti时合金的腐蚀电位正移87 m V,放电容量衰减率从86%减小到47%。展开更多
The structures and electrochemical properties of the Ti1.4V0.6Ni ribbon before and after heat treatment are investigated systematically. The structure of the sample is characterized by X-ray powder diffraction analysi...The structures and electrochemical properties of the Ti1.4V0.6Ni ribbon before and after heat treatment are investigated systematically. The structure of the sample is characterized by X-ray powder diffraction analysis. Electrochemical properties including the discharge capacity, the cyclic stability and the high-rate discharge ability are tested. X-ray powder diffraction analysis shows that after heat treatment at 590 °C for 30 min, all samples mainly consist of the icosahedral quasicrystal phase (I-phase), Ti2Ni phase (FCC), V-based solid solution phase (BCC) and C14 Laves phase (hexagonal). Electrochemical measurements show that the maximum discharge capacity of the alloy electrode after heat treatment is 330.9 mA?h/g under the conditions that the discharge current density is 30 mA/g and the temperature is 30 °C. The result indicates that the cyclic stability and the high-rate discharge ability are all improved. In addition, the electrochemical kinetics of the alloy electrode is also studied by electrochemical impedance spectroscopy (EIS) and hydrogen diffusion coefficient (D).展开更多
A series of layered LiNi0.8?xCo0.1Mn0.1LaxO2(x=0,0.01,0.03)cathode materials were synthesized by combining co-precipitation and high temperature solid state reaction to investigate the effect of La-doping on LiNi0.8Co...A series of layered LiNi0.8?xCo0.1Mn0.1LaxO2(x=0,0.01,0.03)cathode materials were synthesized by combining co-precipitation and high temperature solid state reaction to investigate the effect of La-doping on LiNi0.8Co0.1Mn0.1O2.A new phase La2Li0.5Co0.5O4was observed by XRD,and the content of the new phase could be determined by Retiveld refinement and calculation.The cycle stability of the material is obviously increased from74.3%to95.2%after La-doping,while the initial capacity exhibits a decline trend from202mA·h/g to192mA·h/g.The enhanced cycle stability comes from both of the decrease of impurity and the protection of newly formed La2Li0.5Co0.5O4,which prevents the electrolytic corrosion to the active material.The CV measurement confirms that La-doped material exhibits better reversibility compared with the pristine material.展开更多
Nowadays,it is a matter of great concern to design electrode materials with excellent electrochemical performance for supercapacitors by a safe,efficient and simple method.And these characteristics are usually related...Nowadays,it is a matter of great concern to design electrode materials with excellent electrochemical performance for supercapacitors by a safe,efficient and simple method.And these characteristics are usually related to the vacancies and impurities in the electrode.To investigate the effect of the vacancies on the electrochemical properties of the supercapacitor cathode material,the uniform reduced CoNi2S4(r-CoNi2S4)nanosheets with sulfur vacancies have been successfully prepared by a one-step hydrothermal method.And the formation of sulfur vacancies are characterized by Raman,X-ray photoelectron spectroscopy and other means.As the electrode for supercapacitor,the r-CoNi2S4 nanosheet electrode delivers a high capacity of 1918.9 Fg-1 at a current density of 1 A g-1,superior rate capability(87.9%retention at a current density of 20 A g-1)and extraordinary cycling stability.Compared with the original CoNi2S4 nanosheet electrode(1226 F g-1at current density of 1 A g-1),the r-CoNi2S4 nanosheet electrode shows a great improvement.The asymmetric supercapacitor based on the r-CoNi2S4 positive electrode and activated carbon negative electrode exhibits a high energy density of 30.3 Wh kg-1 at a power density of 802.1 W kg-1,as well as excellent long-term cycling stability.The feasibility and great potential of the device in practical applications have been successfully proved by lightening the light emitting diodes of three different colors.展开更多
文摘采用铜模铸造法制备了V3TiNi0.56Co0.3钒基贮氢合金,并进行物相组成、显微组织、电化学腐蚀性能和电化学循环稳定性能的测试与对比分析。结果表明,铜模铸造制备的V3Ti Ni0.56Co0.3钒基贮氢合金为非晶合金,显著改善了合金的电化学腐蚀性能和电化学循环稳定性能。与常规铸造相比,铜模铸造使其腐蚀电位正移389 m V、最大放电容量增大19.96%、充放电循环20次后的放电容量下降率从96.93%减小至40.22%。
文摘为了有效提高铸态钒基固溶体储氢合金的电化学性能,分别采用三种不同的铸造工艺制备了V_3TiNi_(0.56_Sc_(0.1)钒基固溶体储氢合金铸态试样,并进行了显微组织观察以及电化学循环稳定性和电化学腐蚀性能的测试与分析。结果表明:与常规铸造法相比,静置辅助铸造法和双重辅助铸造法有利于改善合金的铸造质量,细化合金晶粒,提高合金的电化学循环稳定性和电化学腐蚀性能,且双重辅助铸造法效果更佳;静置辅助铸造法、双重辅助铸造法分别使放电容量衰减率减小47%、71%,分别使合金的腐蚀电位正移109、237 m V。
文摘对添加不同含量Ti的Mg2Ni-Ti储氢合金进行了电化学腐蚀试验和电化学循环稳定性的测试与分析,结果表明:合金元素Ti的添加,有利于提高Mg2Ni合金的电化学腐蚀性能和电化学循环稳定性。合金中Ti含量以0.8%为宜。与不添加Ti的Mg2Ni储氢合金相比,添加0.8%Ti时合金的腐蚀电位正移87 m V,放电容量衰减率从86%减小到47%。
基金Project (20112216120001) supported by the Doctoral Program of Tertiary Education of the Ministry of Education of ChinaProject(21215141) supported by the Natural Science Foundation of Jilin Province, China+3 种基金Project (20921002) supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of ChinaProjects (21073179, 61106050) supported by the National Natural Science Foundation of ChinaProject (BE2012047) supported by Scientific and Technological Supporting Program of Jiangsu Province of China and GS Yuasa Corporation of JapanProject (11KZ38) supported by and Scientific and Technological Pillar Project of Changchun, China
文摘The structures and electrochemical properties of the Ti1.4V0.6Ni ribbon before and after heat treatment are investigated systematically. The structure of the sample is characterized by X-ray powder diffraction analysis. Electrochemical properties including the discharge capacity, the cyclic stability and the high-rate discharge ability are tested. X-ray powder diffraction analysis shows that after heat treatment at 590 °C for 30 min, all samples mainly consist of the icosahedral quasicrystal phase (I-phase), Ti2Ni phase (FCC), V-based solid solution phase (BCC) and C14 Laves phase (hexagonal). Electrochemical measurements show that the maximum discharge capacity of the alloy electrode after heat treatment is 330.9 mA?h/g under the conditions that the discharge current density is 30 mA/g and the temperature is 30 °C. The result indicates that the cyclic stability and the high-rate discharge ability are all improved. In addition, the electrochemical kinetics of the alloy electrode is also studied by electrochemical impedance spectroscopy (EIS) and hydrogen diffusion coefficient (D).
基金Project(2014CB643406)supported by the National Basic Research Program of China
文摘A series of layered LiNi0.8?xCo0.1Mn0.1LaxO2(x=0,0.01,0.03)cathode materials were synthesized by combining co-precipitation and high temperature solid state reaction to investigate the effect of La-doping on LiNi0.8Co0.1Mn0.1O2.A new phase La2Li0.5Co0.5O4was observed by XRD,and the content of the new phase could be determined by Retiveld refinement and calculation.The cycle stability of the material is obviously increased from74.3%to95.2%after La-doping,while the initial capacity exhibits a decline trend from202mA·h/g to192mA·h/g.The enhanced cycle stability comes from both of the decrease of impurity and the protection of newly formed La2Li0.5Co0.5O4,which prevents the electrolytic corrosion to the active material.The CV measurement confirms that La-doped material exhibits better reversibility compared with the pristine material.
基金supported by the National Natural Science Foundation of China(61376011 and 51402141)Gansu Provincial Natural Science Foundation(17JR5RA198)+1 种基金the Fundamental Research Funds for the Central Universities(lzujbky-2018-119 and lzujbky-2018-ct08)Shenzhen Science and Technology Innovation Committee(JCYJ20170818155813437)。
文摘Nowadays,it is a matter of great concern to design electrode materials with excellent electrochemical performance for supercapacitors by a safe,efficient and simple method.And these characteristics are usually related to the vacancies and impurities in the electrode.To investigate the effect of the vacancies on the electrochemical properties of the supercapacitor cathode material,the uniform reduced CoNi2S4(r-CoNi2S4)nanosheets with sulfur vacancies have been successfully prepared by a one-step hydrothermal method.And the formation of sulfur vacancies are characterized by Raman,X-ray photoelectron spectroscopy and other means.As the electrode for supercapacitor,the r-CoNi2S4 nanosheet electrode delivers a high capacity of 1918.9 Fg-1 at a current density of 1 A g-1,superior rate capability(87.9%retention at a current density of 20 A g-1)and extraordinary cycling stability.Compared with the original CoNi2S4 nanosheet electrode(1226 F g-1at current density of 1 A g-1),the r-CoNi2S4 nanosheet electrode shows a great improvement.The asymmetric supercapacitor based on the r-CoNi2S4 positive electrode and activated carbon negative electrode exhibits a high energy density of 30.3 Wh kg-1 at a power density of 802.1 W kg-1,as well as excellent long-term cycling stability.The feasibility and great potential of the device in practical applications have been successfully proved by lightening the light emitting diodes of three different colors.
