Shi Yanmei, Yu Yu, Liang Yu, Du Yonghua, Zhang Bin
Department of Chemistry, School of Science, and Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China.
Institute of Chemical and Engineering Sciences, A*STAR (Agency for Science, Technology and Research), 1 Pesek Road, Jurong Island, 627833, Singapore, Singapore.
Angew Chem Int Ed Engl. 2019 Mar 18;58(12):3769-3773. doi: 10.1002/anie.201811241. Epub 2019 Jan 9.
The oxygen evolution reaction (OER) is an important half reaction in many energy conversion and storage techniques. However, the development of a low-cost easy-prepared OER electrocatalyst with high mass activity and rapid kinetics is still challenging. Herein, we report the facile deposition of tannin-NiFe (TANF) complex film on carbon fiber paper (CP) as a highly efficient OER electrocatalyst. TANF gives rapid OER reaction kinetics with a very small Tafel slope of 28 mV dec . The mass activity of TANF reaches 9.17×10 Ag at an overpotential of 300 mV, which is nearly 200-times larger than that of NiFe double layered hydroxide. Furthermore, tannic acid in TANF can be electrochemically extracted under anodic potential, leaving the inorganic composite Ni Fe O H as the OER-active species. This work may provide a guide to probing the electrochemical transformation and investigating the reactive species of other metal-organic complexes as heterogeneous electrocatalysts.
析氧反应（OER）是许多能量转换和存储技术中的一个重要半反应。然而，开发一种具有高质量活性和快速动力学的低成本、易于制备的OER电催化剂仍然具有挑战性。在此，我们报道了单宁酸-镍铁（TANF）复合膜在碳纤维纸（CP）上的简便沉积，作为一种高效的OER电催化剂。TANF具有快速的OER反应动力学，其塔菲尔斜率非常小，仅为28 mV dec。在300 mV的过电位下，TANF的质量活性达到9.17×10 Ag，几乎是镍铁双层氢氧化物的200倍。此外，TANF中的单宁酸在阳极电位下可被电化学提取，留下无机复合物Ni Fe O H作为OER活性物种。这项工作可能为探索电化学转变和研究其他金属有机配合物作为非均相电催化剂的活性物种提供指导。
