School of Chemical and Biomedical Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Institute for New Energy Materials & Low-Carbon Technologies, Tianjin University of Technology, Tianjin, P.R. China.
Chemistry. 2018 Dec 10;24(69):18502-18511. doi: 10.1002/chem.201802092. Epub 2018 Jun 25.
A cost-effective and efficient electrocatalyst for the oxygen evolution reaction during the electrolysis of water is highly desired. In an effort to develop an economical material for replacing precious-metal-based catalysts, a novel and self-standing amorphous ultrathin nanosheet (NS) of bimetallic iron-nickel boride (Fe-Ni-B NSs) on Ni foam is presented, which displays a better oxygen-evolving activity compared to the precious-metal catalyst RuO . In 1.0 m KOH electrolyte solution, it requires an overpotential of only 237 mV to reach a current density of 10 mA cm with a small Tafel slope of 38 mV dec and shows prominent long-term electrochemical stability. A synergistic effect between highly abundant catalytically active sites on the 3D porous substrate improved the electron transport arising from the presence of highly negative boron, and the high conductivity of the substrate results in an outstanding electrocatalytic activity. The advanced catalytic activity, facile electrode fabrication, and low costs make it a potential oxygen-evolving material, which may be extended to other energy-conversion and storage technologies.
在水电解过程中，寻找一种经济高效的氧气析出反应电催化剂是十分必要的。为了开发一种可替代贵金属基催化剂的经济型材料，本文提出了一种在泡沫镍上具有自支撑的非晶态超薄纳米片（NS）的新型双金属铁-镍硼化物（Fe-Ni-B NSs），其析氧活性优于贵金属催化剂 RuO 。在 1.0 m KOH 电解质溶液中，仅需 237 mV 的过电势，即可达到 10 mA cm 的电流密度，具有较小的 38 mV dec 的塔菲尔斜率，表现出突出的长期电化学稳定性。3D 多孔基底上丰富的催化活性位点的协同作用提高了电子传输能力，这是由于硼的高度负电性，而基底的高导电性则导致了优异的电催化活性。其先进的催化活性、易于制备电极以及低成本使其成为一种有潜力的氧气析出材料，有望扩展到其他能量转换和存储技术中。
