首页|One-step fabrication of hierarchically flower-like N-doped carbon-CoMo-LDH nanosheets for efficient overall alkaline water splitting

One-step fabrication of hierarchically flower-like N-doped carbon-CoMo-LDH nanosheets for efficient overall alkaline water splitting

扫码查看
原文链接
  • NETL
  • NSTL
  • Elsevier
© 2024 Hydrogen Energy Publications LLCDeveloping highly active, durable, and cost-effective layered double hydroxides (LDHs) based electrocatalysts using earth-abundant metals (like Co, Mo) is crucial for efficient water splitting. However, limited electrical conductivity, large lateral size, and significant bulk thickness of LDHs are bottlenecks for their electrocatalytic activity. This work develops a highly porous hierarchical nitrogen (N)-doped carbon-based CoMo-LDH nanosheet (denoted as N–CoMo-LDH) by a one-step hydrothermal method. Due to its ultrathin morphology and the optimized electronic configuration, the Co1Mo1/130 catalyst demonstrates a low overpotential of 127 mV for the hydrogen evolution reaction (HER) and 220 mV for the oxygen evolution reaction (OER) at a current density of 10 mA cm−2 in 1.0 M KOH. Furthermore, the Co1Mo1/130 as a bifunctional catalyst achieved a low cell voltage of 1.572 V@10 mA cm−2 with good durability over 100 h in alkaline media. Results revealed that the precise control of the Co/Mo ratio and the incorporation of heteroatoms N-doping finely tune the electronic properties of CoMo-LDH by enhancing charge density and promoting the formation of new active sites, thereby improving its electrocatalytic activity. In addition, N-doping significantly modifies the carbon electronic structure, increasing pyridinic N-content, introducing localized electron-rich sites within the carbon matrix, and boosting the material's overall conductivity and electron transfer efficiency. This study presents a promising strategy for boosting electrocatalytic activity by developing hierarchical N-doped carbon-based bimetallic-LDH materials for overall water splitting.

Bifunctional electrocatalystsCoMo-LDHHierarchical nanosheetsN-Doped carbonOxygen evolution reaction

Meng S.、Nie Q.、Yaseen W.、Mao H.、Chen M.、Xie J.、Xu Y.、Xie M.

展开 >

School of Chemistry and Chemical Engineering Jiangsu University

School of Chemistry and Chemical Engineering Jiangsu University||School of Pharmacy Jiangsu University||Jiangsu Jiangke Graphene Research Institure Co. LTD Jiangsu Jiangke Composite Material Co. LTD

School of Pharmacy Jiangsu University

2025

10.1016/j.ijhydene.2024.12.116

International journal of hydrogen energy

International journal of hydrogen energy

ISSN：0360-3199
年,卷(期)：2025.99(Jan.)
  • 45