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Improved Electrocatalytic Performance in Overall Water Splitting with Rational Design of Hierarchical Co 3 O 4 @NiFe Layered Double Hydroxide Core‐Shell Nanostructure
Author(s) -
Wang Shanpeng,
Wu Jian,
Yin Junwen,
Hu Qi,
Geng Dongsheng,
Liu LiMin
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800194
Subject(s) - overpotential , tafel equation , water splitting , oxygen evolution , materials science , hydroxide , chemical engineering , nanostructure , anode , electrocatalyst , cathode , catalysis , nanowire , current density , nanotechnology , inorganic chemistry , electrode , chemistry , electrochemistry , biochemistry , physics , photocatalysis , quantum mechanics , engineering
The development of low‐cost and highly reactive electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in basic media is still a great challenge. Herein, we design a three‐dimensional Co 3 O 4 @NiFe‐LDH (LDH: layered double hydroxide) core‐shell nanostructure on Ni foam, in which the core Co 3 O 4 nanowires play a key role in the stability and the shell NiFe‐LDH nanosheets provide the main active sites for electrocatalytic water splitting. The as‐prepared Co 3 O 4 @NiFe‐LDH exhibits excellent electrocatalytic activity for OER with a low overpotential of 269 mV at a current density of 100 mA cm −2 , a small Tafel slope of 66 mV dec −1 , and excellent stability without degradation over 40 h. Furthermore, the sample also demonstrates robust performance for HER with a low overpotential of 74 mV at a current density of 10 mA cm −2 . Most importantly, when employing the Co 3 O 4 @NiFe‐LDH/NF as both anode and cathode, only 1.56 V is needed to achieve a current density of 10 mA cm −2 , which is lower than the combination of Pt/C and IrO 2 catalysts for overall water splitting. This work provides a significant strategy toward the rational design of novel core‐shell electrocatalysts for overall water splitting.

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