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Interplanar Growth of 2D Non‐Van der Waals Co 2 N‐Based Heterostructures for Efficient Overall Water Splitting
Author(s) -
Jiang Jingyun,
Yan Pengfei,
Zhou Yannan,
Cheng Zhenfeng,
Cui Xinwei,
Ge Yifei,
Xu Qun
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202002214
Subject(s) - overpotential , materials science , van der waals force , graphene , water splitting , heterojunction , nanotechnology , chemical engineering , bifunctional , catalysis , optoelectronics , chemistry , molecule , electrode , photocatalysis , physics , biochemistry , engineering , electrochemistry , quantum mechanics
The design and synthesis of 2D heterostructured materials for water splitting are normally based on van der Waals (vdW) nanosheets, but this approach is gradually approaching a performance ceiling in terms of activity and stability. Herein, a novel heterostructured system is explored based on 2D non‐vdW and conductive nanosheets. Notably, the interplanar growth of 2D non‐vdW Co 2 N nanosheets is realized between graphene layers in the current collector of carbon fiber papers (CPs), generating an interlocking structure within CPs. The exposed surface of Co 2 N nanosheets possesses a high surface energy that anchors highly active CoNC, forming 2D CoNC@Co 2 N heterostructures outside CPs. This integrated electrocatalytic system bridged by non‐vdW Co 2 N nanosheets presents a low overpotential of 1.52 V and an excellent stability of 280 h, which outperform most bifunctional and nonprecious‐metal‐based electrocatalysts in alkaline media, owing to the nature of 2D non‐vdW nanosheets and the formation of strong and conductive connections among CoNC, nanosheets, and CPs.