Two‐Dimensional NiIr@N‐Doped Carbon Nanocomposites Supported on Ni Foam for Electrocatalytic Overall Water Splitting
You Xu, Xingjie Chai, Mengying Liu, Tianlun Ren, Shanshan Yu, Ziqiang Wang, Xiao‐Nian Li, Liang Wang, Hongjing Wang
Abstract
Abstract Electrochemical water splitting can provide a promising avenue for sustainable hydrogen production. Highly efficient electrocatalysts toward the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are extremely important for the practical application of water splitting technology. Herein, a one‐step annealing strategy is reported for the fabrication of a metal–organic framework‐derived bifunctional self‐supported electrocatalyst, which is composed of two‐dimensional N‐doped carbon‐wrapped Ir‐doped Ni nanoparticle composites supported on Ni foam (NiIr@N‐C/NF). The resultant NiIr@N‐C/NF displays excellent electrocatalytic performance in 1.0 m KOH, with low overpotentials of 32 mV at 10 mA cm −2 for the HER and 329 mV at 50 mA cm −2 for the OER. Particularly, the HER‐OER bifunctional NiIr@N‐C/NF needs only 1.50 V to yield 10 mA cm −2 for overall water splitting.