Zhang Zhao, Li Xiaopeng, Zhong Cheng, Zhao Naiqin, Deng Yida, Han Xiaopeng, Hu Wenbin
School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin University, Tianjin, 300350, P. R. China.
Angew Chem Int Ed Engl. 2020 Apr 27;59(18):7245-7250. doi: 10.1002/anie.202001703. Epub 2020 Mar 13.
The fabrication of metal-supported hybrid structures with enhanced properties typically requires external energy input, such as pyrolysis, photolysis, and electrodeposition. In this study, silver-nanoparticle-decorated transition-metal hydroxide (TMH) composites were synthesized by an approach based on a spontaneous redox reaction (SRR) at room temperature. The SRR between silver ions and TMH provides a simple and facile route to establish effective and stable heterostructures that can enhance the oxygen evolution reaction (OER) activity. Ag@Co(OH) grown on carbon cloth exhibits outstanding OER activity and durability, even superior to IrO and many previously reported OER electrocatalysts. Experimental and theoretical analysis demonstrates that the strong electronic interaction between Ag and Co(OH) activates the silver clusters as catalytically OER active sites, effectively optimizing the binding energies with reacted intermediates and facilitating the OER kinetics.
制备具有增强性能的金属支撑混合结构通常需要外部能量输入，如热解、光解和电沉积。在本研究中，通过基于室温下自发氧化还原反应（SRR）的方法合成了银纳米颗粒修饰的过渡金属氢氧化物（TMH）复合材料。银离子与TMH之间的SRR提供了一条简单便捷的途径来建立有效且稳定的异质结构，从而增强析氧反应（OER）活性。生长在碳布上的Ag@Co(OH)表现出出色的OER活性和耐久性，甚至优于IrO以及许多先前报道的OER电催化剂。实验和理论分析表明，Ag与Co(OH)之间的强电子相互作用激活了银簇作为催化OER活性位点，有效地优化了与反应中间体的结合能并促进了OER动力学。
