N?Doped Graphene?Decorated NiCo Alloy Coupled with Mesoporous NiCoMoO Nano?sheet Heterojunction for Enhanced Water Electrolysis Activity at High Current Density

• 来源期刊: 纳微快报（英文版）
• 年，卷（期）: 2021,（5）
• 页码范围: 77-89
• 页数: 13页
• 语种: 英文

摘要

Developing highly effective and stable non-noble metal-based bifunctional catalyst working at high current density is an urgent issue for water electrolysis (WE). Herein, we prepare the N-doped graphene-decorated NiCo alloy coupled with mesoporous NiCoMoO nano-sheet grown on 3D nickel foam (NiCo@C-NiCoMoO/NF) for water splitting. NiCo@C-NiCoMoO/NF exhibits outstanding activity with low overpotentials for hydrogen and oxygen evolution reaction (HER: 39/266 mV; OER: 260/390 mV) at ± 10 and ± 1000 mA cm?2. More importantly, in 6.0 M KOH solution at 60 °C for WE, it only requires 1.90 V to reach 1000 mA cm?2 and shows excellent stabil-ity for 43 h, exhibiting the potential for actual application. The good performance can be assigned to N-doped graphene-decorated NiCo alloy and mesoporous NiCoMoO nano-sheet, which not only increase the intrinsic activity and expose abundant catalytic activity sites, butalso enhance its chemical and mechanical stability. This work thus could provide a promising material for industrial hydrogen production.