A study of photocatalytic, chemical, and electrocatalytic water oxidation on ACo(2)O(4) (A = Ni, Cu, Zn) samples through doping different metal ions

作者：Zhao, Yukun; Zhou, Xichen; Ding, Yong^*; Huang, Jingwei; Zheng, Min; Ye, Weichun

来源：Journal of Catalysis, 2016, 338: 30-37.

DOI：10.1016/j.jcat.2016.02.003

• ACo(2)O(4) samples
• Water oxidation
• Catalytic activity order
• Doping
• Charge and electron transport

ACo(2)O(4) samples were synthesized as water oxidation catalysts. The samples were characterized by multiple experiments to confirm their uniform morphology, which belongs to the spine] structure (Fd3m space group). The catalytic activity of ACo(2)O(4) samples was investigated under photochemical, chemical, and electrochemical conditions; it follows the catalytic activity order NiCo2O4 > CuCo2O4 > ZnCo2O4. This activity sequence results from different doping metal ions in {Co4O4} motifs, which act as the active sites of water oxidation. Electrochemical impedance spectroscopy and other experimental data demonstrate that ACo(2)O(4) samples doped with different metal ions may influence the rate of charge and electron transport. Therefore, the catalytic activity of water oxidation followed the above order.

• 出版日期2016-6
• 单位中国科学院; 羰基合成与选择氧化国家重点实验室; 兰州大学; 中国科学院兰州化学物理研究所; 功能有机分子化学国家重点实验室