Department of Chemistry, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin (Germany).
Angew Chem Int Ed Engl. 2014 May 12;53(20):5183-7. doi: 10.1002/anie.201400243. Epub 2014 Apr 28.
In regard to earth-abundant cobalt water oxidation catalysts, very recent findings show the reorganization of the materials to amorphous active phases under catalytic conditions. To further understand this concept, a unique cobalt-substituted crystalline zinc oxide (Co:ZnO) precatalyst has been synthesized by low-temperature solvolysis of molecular heterobimetallic Co(4-x)Zn(x) O4 (x = 1-3) precursors in benzylamine. Its electrophoretic deposition onto fluorinated tin oxide electrodes leads after oxidative conditioning to an amorphous self-supported water-oxidation electrocatalyst, which was observed by HR-TEM on FIB lamellas of the EPD layers. The Co-rich hydroxide-oxidic electrocatalyst performs at very low overpotentials (512 mV at pH 7; 330 mV at pH 12), while chronoamperometry shows a stable catalytic current over several hours.
关于丰富的钴水氧化催化剂，最近的研究结果表明，在催化条件下，这些材料会重组为非晶态活性相。为了进一步理解这一概念，通过在苄胺中低温溶剂解分子异双核钴（4-x）锌（x）O4（x=1-3）前体，合成了一种独特的钴取代结晶氧化锌（Co:ZnO）前催化剂。将其电泳沉积到氟化锡氧化物电极上，经过氧化处理后得到一种非晶自支撑水氧化电催化剂，通过 FIB 薄片的高分辨率透射电子显微镜观察到了该电催化剂。富钴氢氧化物电催化剂的过电势非常低（pH=7 时为 512 mV；pH=12 时为 330 mV），而计时安培法显示在几个小时内催化电流稳定。
