一种用于水分解的高活性钴铁层状双氢氧化物。
A Highly Active CoFe Layered Double Hydroxide for Water Splitting.
作者信息
Feng Lanxiang, Li Airong, Li Yuxuan, Liu Jia, Wang Leidanyang, Huang Lieyuan, Wang Yong, Ge Xingbo
机构信息
School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, P. R. China.
出版信息
Chempluschem. 2017 Mar;82(3):483-488. doi: 10.1002/cplu.201700005.
Highly active, cost-effective, and durable catalysts for oxygen evolution reaction (OER) are required in energy conversion and storage processes. A facile synthesis of CoFe layered double hydroxide (CoFe LDH) is reported as a highly active and stable oxygen evolution catalyst. By varying the concentration of the metal ion precursor, the Co/Fe ratios of LDH products can be tuned from 0.5 to 7.4. The structure and electrocatalytic activity of the obtained catalysts were found to show a strong dependence on the Co/Fe ratios. The Co Fe LDH sample exhibited the best electrocatalytic performance for OER with an onset potential of 1.52 V (vs. the reversible hydrogen electrode, RHE) and a Tafel slope of 83 mV dec . The Co Fe LDH was further loaded onto a Ni foam (NF) substrate to form a 3D porous architecture electrode, offering a long-term current density of 100 mA cm at 1.65 V (vs. RHE) towards the OER.
在能量转换和存储过程中，需要高活性、高性价比且耐用的析氧反应（OER）催化剂。本文报道了一种简便合成钴铁层状双氢氧化物（CoFe LDH）的方法，该材料是一种高活性且稳定的析氧催化剂。通过改变金属离子前驱体的浓度，LDH产物的Co/Fe比可在0.5至7.4之间调节。研究发现，所得催化剂的结构和电催化活性强烈依赖于Co/Fe比。CoFe LDH样品对OER表现出最佳的电催化性能，起始电位为1.52 V（相对于可逆氢电极，RHE），塔菲尔斜率为83 mV dec。CoFe LDH进一步负载到泡沫镍（NF）基底上，形成三维多孔结构电极，在1.65 V（相对于RHE）下对OER提供100 mA cm的长期电流密度。
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