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2D/2D Heterojunction of Ni−Co−P/Graphdiyne for Optimized Electrocatalytic Overall Water Splitting
Author(s) -
Yin XuePeng,
Lu David,
Wang JiaWei,
Lu XiuLi
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201901173
Subject(s) - overpotential , water splitting , x ray photoelectron spectroscopy , oxygen evolution , heterojunction , bifunctional , materials science , ternary operation , electrocatalyst , catalysis , raman spectroscopy , electrochemistry , chemical engineering , electrode , chemistry , optoelectronics , biochemistry , physics , optics , photocatalysis , computer science , engineering , programming language
The development of efficient catalysts for water splitting in alkaline condition is central to produce hydrogen for renewable energy storage. Herein, we fabricated a new 2D/2D heterojunction via directly electrodepositing of ternary Ni−Co−P nanosheets on graphdiyne (GDY) nanowalls. Benefiting from the synergistic interaction between Ni−Co−P and GDY, Ni−Co−P/GDY shows obviously improved activity for electrocatalytic hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), realizing a large current density of 300 mA/cm 2 for HER at low overpotential of 313 mV, much lower than that of commercial 20 wt% Pt/C (430 mV), and a much better OER performance than the commercial RuO 2 . A small cell voltage of 1.60 V is sufficient to achieve the standard 10 mA/cm 2 current density by Ni−Co−P/GDY as a bifunctional electrode for water splitting in 1.0 M KOH solution. Raman, XPS and Surface valence band photoemission spectroscopic measurements confirm that the GDY‐incorporation strategy optimizes the electronic structure of the Ni−Co−P and thus promotes its electrocatalytic activity.