Fe-doped Nickel Carbonate Hydroxide Array Electrocatalysts for Enhanced Oxygen Evolution Reaction

摘要

Developing efficient and inexpensive oxygen evolution reaction (OER) electrocatalysts is crucial to address the ever-increasing energy crisis and environment pollution. In this work, bimetallic nickel-iron carbonate hydroxide arrays were strongly grown on a conductive carbon cloth (NiFeCH/CC) through a facile one-step hydrothermal method, which were used as oxygen evolution reaction (OER) electrocatalysts. Ni0.8Fe0.2CH/CC requires overpotential of just 246 mV at 10 mA cm(-2), Tafel slope of 43 mV dec(-1), and charge transfer resistance of 3.1 omega for OER in 1 M KOH. The catalyst also shows excellent durability by a long-term operation for 10 h. A post-OER study of Ni0.8Fe0.2CH/CC reveals that the NiFeOOH species form on the surface during OER and the carbonate ions still intercalate between the cationic layers. Benefiting from a three-dimensional structure and Fe doping strategy, the performance of Ni0.8Fe0.2CH/CC has been improved. This work provides an effective strategy to design efficient OER electrocatalysts in alkaline media.