Achieving Rich and Active Alkaline Hydrogen Evolution Heterostructures via Interface Engineering on 2D 1T‐MoS<sub>2</sub> Quantum Sheets
Wenshu Chen, Jiajun Gu, Yongping Du, Fang Song, Fanxing Bu, Jinghan Li, Yang Yuan, Ruichun Luo, Qinglei Liu, Di Zhang
Abstract
Abstract Large‐scale production of hydrogen from water‐alkali electrolyzers is impeded by the sluggish kinetics of hydrogen evolution reaction (HER) electrocatalysts. The hybridization of an acid‐active HER catalyst with a cocatalyst at the nanoscale helps boost HER kinetics in alkaline media. Here, it is demonstrated that 1T–MoS 2 nanosheet edges (instead of basal planes) decorated by metal hydroxides form highly active / heterostructures, which significantly enhance HER performance in alkaline media. Featured with rich / sites, the fabricated 1T–MoS 2 QS/Ni(OH) 2 hybrid (quantum sized 1T–MoS 2 sheets decorated with Ni(OH) 2 via interface engineering) only requires overpotentials of 57 and 112 mV to drive HER current densities of 10 and 100 mA cm −2 , respectively, and has a low Tafel slope of 30 mV dec −1 in 1 m KOH. So far, this is the best performance for MoS 2 ‐based electrocatalysts and the 1T–MoS 2 QS/Ni(OH) 2 hybrid is among the best‐performing non‐Pt alkaline HER electrocatalysts known. The HER process is durable for 100 h at current densities up to 500 mA cm −2 . This work not only provides an active, cost‐effective, and robust alkaline HER electrocatalyst, but also demonstrates a design strategy for preparing high‐performance catalysts based on edge‐rich 2D quantum sheets for other catalytic reactions.