使用Co(NO3)2·6H2O为原料,采用简单的还原-氧化法制得了二维超薄α-Co(OH)2纳米片。使用透射电子显微镜(TEM),X射线衍射仪(XRD)对其进行形貌分析及结构表征,并研究了其电催化析氧活性。在1 M的KOH电解液中,样品表现出优异的电催化...使用Co(NO3)2·6H2O为原料,采用简单的还原-氧化法制得了二维超薄α-Co(OH)2纳米片。使用透射电子显微镜(TEM),X射线衍射仪(XRD)对其进行形貌分析及结构表征,并研究了其电催化析氧活性。在1 M的KOH电解液中,样品表现出优异的电催化析氧性能,其在电流密度为10 m A/cm2时的析氧过电位仅为290 m V,塔菲尔斜率为84 m V/dec,且经过1500次CV循环后保持了良好的稳定性。该合成方法简单廉价,产物电催化析氧活性较高,可适用于大规模工业生产。展开更多
Al/Co co-doped α-Ni（OH）2 samples were prepared by either ultrasonic co-precipitation method （Sample B） or co-precipitation method （Sample A）. The crystal structure and particle size distribution of the prepared...Al/Co co-doped α-Ni（OH）2 samples were prepared by either ultrasonic co-precipitation method （Sample B） or co-precipitation method （Sample A）. The crystal structure and particle size distribution of the prepared samples were examined by X-ray diffraction （XRD） and laser particle size analyzer, respectively. The results show that Sample B has more crystalline defects and smaller average diameter than Sample A. The cyclic voltammetry and electrochemical impedance spectroscopy measurements indicate that Sample B has better electrochemical performance than Sample A, such as better reaction reversibility, lower charge-transfer resistance and better cyclic stability. Proton diffusion coefficient of Sample B is 1.96×10-10cm2/s, which is two times as large as that （9.78×10-11cm2/s） of Sample A. The charge-discharge tests show that the discharge capacity （308 mA·h/g） of Sample B is 25 mA·h/g higher than that of Sample A （283 mA·h/g）.展开更多
文摘使用Co(NO3)2·6H2O为原料,采用简单的还原-氧化法制得了二维超薄α-Co(OH)2纳米片。使用透射电子显微镜(TEM),X射线衍射仪(XRD)对其进行形貌分析及结构表征,并研究了其电催化析氧活性。在1 M的KOH电解液中,样品表现出优异的电催化析氧性能,其在电流密度为10 m A/cm2时的析氧过电位仅为290 m V,塔菲尔斜率为84 m V/dec,且经过1500次CV循环后保持了良好的稳定性。该合成方法简单廉价,产物电催化析氧活性较高,可适用于大规模工业生产。
基金Project (10774030) supported by the National Natural Science Foundation of ChinaProject (2008J1-C161) supported by the Science and Technology Program of Guangzhou City of China
文摘Al/Co co-doped α-Ni（OH）2 samples were prepared by either ultrasonic co-precipitation method （Sample B） or co-precipitation method （Sample A）. The crystal structure and particle size distribution of the prepared samples were examined by X-ray diffraction （XRD） and laser particle size analyzer, respectively. The results show that Sample B has more crystalline defects and smaller average diameter than Sample A. The cyclic voltammetry and electrochemical impedance spectroscopy measurements indicate that Sample B has better electrochemical performance than Sample A, such as better reaction reversibility, lower charge-transfer resistance and better cyclic stability. Proton diffusion coefficient of Sample B is 1.96×10-10cm2/s, which is two times as large as that （9.78×10-11cm2/s） of Sample A. The charge-discharge tests show that the discharge capacity （308 mA·h/g） of Sample B is 25 mA·h/g higher than that of Sample A （283 mA·h/g）.
