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
Hui Zhang
中科院分区:
工程技术2区
文献类型:
--
作者:
Jiawei Guo;Zhuojun Wei;Kun Wang;Hui Zhang

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采用柠檬酸辅助水相共沉淀法在rGO(还原石墨烯氧化物)均匀修饰的泡沫镍表面原位生长了新型CoFe-LDH(层状双氢氧化物)纳米片阵列。系统表征表明,CoxFe1-LDH/rGO/Nf(x=4,3,2)系列均为CoxFe1-LDH纳米片状(150~180×15 nm)垂直生长在rGO/Nf表面。其中,Co3Fe1-LDH/rGO/NF的析氧性能最好,在10 mA/cm−2in1/mKOH下,析氧反应和析氢反应的过电位分别为250和110 mV。当它同时用作阴极和阳极进行整体分水时,在10 mA/cm−2时分别需要1.65nV和1.84nV。Co3Fe1-LDH/rGO/NF的优异性能归功于具有开放沟道的纳米片状阵列结构,Co3Fe1-LDH与rGO之间的协同耦合提高了导电性,以及Co3Fe1-LDH在rGO/NF上的原位生长提高了稳定性。
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.
由层状双氢氧化物转化而来的多孔 CoP 纳米片,具有优异的电化学活性,可在宽 pH 范围内进行析氢反应
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