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A High Faraday Efficiency NiMoO 4 Nanosheet Array Catalyst by Adjusting the Hydrophilicity for Overall Water Splitting
Author(s) -
Wang Zining,
Wang Hui,
Ji Shan,
Wang Xuyun,
Zhou Pengxin,
Huo Shuhui,
Linkov Vladimir,
Wang Rongfang
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202002310
Subject(s) - overpotential , nanosheet , water splitting , materials science , oxygen evolution , catalysis , chemical engineering , electrode , electrochemistry , nanotechnology , inorganic chemistry , chemistry , photocatalysis , organic chemistry , engineering
To obtain a highly active, stable, and binder‐free electrode based on transition‐metal compounds for water splitting, nickel foam‐supported 3D NiMoO 4 nanosheet arrays modified with 0D Fe‐doped carbon quantum dots (Fe‐CQDs/NiMoO 4 /NF) are synthesized. The structure characterizations indicated that 0D Fe‐CQDs are evenly dispersed onto the NiMoO 4 sheets of the arrays. The contact angle analysis confirmed that the surface hydrophilia of the arrays is improved after the 0D Fe‐CQDs are deposited 3D on the NiMoO 4 sheets. Here, both the activity and durability in electrochemical water splitting are significantly enhanced with the Fe‐CQDs/NiMoO 4 /NF catalysts. At a current density of 10 mA cm −2 , the resultant Fe‐CQDs/NiMoO 4 /NF revealed an overpotential of only 117 mV for the hydrogen evolution reaction (HER), a relatively low overpotential of 336 mV toward the oxygen evolution reaction (OER), and a Faraday efficiency of up to 99 %. This performance can be attributed to the unique 3D nanosheet array structure, the synergistic effect, and the optimal hydrophilia for gas evolution evolved from the electrode surface.