Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China.
Chem Commun (Camb). 2019 Jan 24;55(9):1334-1337. doi: 10.1039/c8cc09893j.
NiFe layered double hydroxides (NiFe-LDHs) have been regarded as significant electrocatalysts for the oxygen evolution reaction (OER). However, their overpotential must still be further reduced to enable commercial applications. Herein, a promising and highly effective "hydroxyl ions hungry" electrode structure was prepared for the first time via a two-step hydrothermal reaction procedure to enhance the surface adsorption kinetics to obtain an ultralow overpotential. The electrode exhibits OER activity with ultralow overpotentials of 203 mV and 293 mV at the current densities of 10 mA cm-2 and 100 mA cm-2, respectively, in 1.0 M KOH. These results reveal an important way to improve the catalytic performance in an alkaline medium.
镍铁层状双氢氧化物（NiFe-LDHs）已被认为是氧析出反应（OER）的重要电催化剂。然而，为了实现商业化应用，其过电位仍需进一步降低。在此，首次通过两步水热反应程序制备了一种很有前景且高效的“羟基饥饿”电极结构，以增强表面吸附动力学，从而获得超低过电位。该电极在 1.0 M KOH 中，在电流密度为 10 mA cm-2 和 100 mA cm-2 时，具有超低的过电位，分别为 203 mV 和 293 mV。这些结果揭示了一种在碱性介质中提高催化性能的重要途径。
