Synergistic coupling of CoFe-layered double hydroxide nanosheet arrays with reduced graphene oxide modified Ni foam for highly efficient oxygen evolution reaction and hydrogen evolution reaction
Synergistic coupling of CoFe-layered double hydroxide nanosheet arrays with reduced graphene oxide modified Ni foam for highly efficient oxygen evolution reaction and hydrogen evolution reaction
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CoFe层状双氢氧化物纳米片阵列与还原氧化石墨烯改性镍泡沫的协同耦合用于高效析氧反应和析氢反应
DOI:
10.1016/j.ijhydene.2021.06.013
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发表时间:
2021-07
影响因子:
7.2
通讯作者:
Hui Zhang
中科院分区:
文献类型:
--
作者:
Jiawei Guo;Zhuojun Wei;Kun Wang;Hui Zhang
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 acid-assisted 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 × 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−2in 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.
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