Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 54, Pages 27529-27542Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.06.013
Keywords
Layered double hydroxide; Reduced graphene oxide; Nanosheet arrays; Oxygen evolution reaction; Hydrogen evolution reaction; Electrocatalysis
Categories
Funding
- National Natural Science Foundation of China [21878007, 21838007]
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CoFe-LDH nanosheet arrays with excellent electrocatalytic performance were synthesized via citric acid-assisted aqueous phase coprecipitation on rGO-modified Ni foam, showing promising applications for oxygen and hydrogen evolution reactions, as well as overall water splitting.
Novel CoFe-LDH (layered double hydroxide) nanosheet arrays in situ grown on rGO (reduced graphene oxide) uniformly modified Ni foam were synthesized by a citric acidassisted aqueous phase coprecipitation strategy. Systematic characterizations indicates that the series of CoxFe1-LDH/rGO/NF (x = 4, 3, 2) all show CoxFe1-LDH nanosheets (150-180 x 15 nm) grown vertically on the surface of rGO/NF. Especially, the Co3Fe1-LDH/rGO/NF exhibits the best performance with overpotentials of 250 and 110 mV at 10 mA cm(-2) in 1 M KOH for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. When it is used as cathode and anode simultaneously for overall water splitting, they require 1.65 and 1.84 V at 10 and 100 mA cm(-2), respectively. Excellent performance of Co3Fe1-LDH/rGO/NF is due to the nanosheet arrays structure with open channels, synergistic coupling between Co3Fe1-LDH and rGO enhancing electrical conductivity, and in-situ growth of Co3Fe1-LDH on rGO/NF enhancing stability. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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