Amorphous Metal–Organic Framework-Derived Electrocatalyst to Boost Water Oxidation
Qingxi Zhai, Kuo‐Juei Hu, Yuxuan Shi, Hurong Ji, Hao Wu, Yilun Ren, Biao Wang, Shaochun Tang, Yujie Ma, Mingjin Cui, Xiangkang Meng
Abstract
Amorphous metal–organic framework (MOF) materials have drawn extensive interest in the design of high-performance electrocatalysts for use in the electrochemical oxygen evolution reaction. However, there are limitations to the utilization of amorphous MOFs due to their low electrical conductivity and unsatisfactory stability. Herein, a novel amorphous–crystalline (AC) heterostructure is successfully constructed by synthesizing a crystalline metal sulfide (MS)-embedded amorphous Ni 0.67 Fe 0.33 -MOF, namely an MS/Ni 0.67 Fe 0.33 -MOF. It exhibits excellent catalytic performance (a low overpotential of 248 mV at 10 mA cm –2 with a small Tafel slope of 50 mV decade –1 ), durability, and stability (only 8% degradation of the current density at a constant voltage after 24 h). This work thus sheds light on the engineering of highly efficient catalysts with AC heterointerfaces for optimizing water-splitting systems.