Tentacle-like core-shell CoNi2S4/C3N4 bifunctional electrocatalysts for efficient overall alkaline water splitting

被引：2

作者：

Li, Qingfei ^{[1
]}

Li, Nan ^{[1
]}

Wu, Mianmian ^{[1
]}

Sun, Guifang ^{[1
]}

Shen, Wenjing ^{[1
]}

Shi, Minghao ^{[1
]}

Ma, Jiangquan ^{[1
]}

机构：

[1] Changzhou Univ, Jiangsu Prov Adv Catalysis & Green Mfg Collaborat, Changzhou 213164, Peoples R China

来源：

DALTON TRANSACTIONS | 2023年 / 52卷 / 24期

关键词：

OXYGEN EVOLUTION; NI FOAM; HYDROGEN; ARRAYS; NANOSHEETS; OXIDATION; HETEROSTRUCTURES; NANOPARTICLES; DERIVATIVES; ELECTRODES;

D O I：

10.1039/d3dt00989k

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Stable and efficient bifunctional electrocatalysts are of great significance for sustainable energy conversion and human society sustainability. However, conventional electrocatalytic materials tend to exhibit high overpotentials and unsatisfactory chemical activities. Herein, we construct novel CoNi<INF>2</INF>S<INF>4</INF>/C<INF>3</INF>N<INF>4</INF> nanowires on a nickel foam (NF) electrode as a bifunctional electrocatalyst for alkaline water splitting by a two-step hydrothermal and thermal annealing process. The prepared CoNi<INF>2</INF>S<INF>4</INF>/C<INF>3</INF>N<INF>4</INF> electrocatalyst exhibits superior HER (e.g. 40 mV (eta<INF>H<INF>2</INF></INF>10)) and OER (e.g. 110 mV (eta<INF>O<INF>2</INF></INF>10)) activities in a 1 M KOH electrolyte, which are much smaller than those of bare NF, Co@NF, NiCoO@NF and most reported materials. Furthermore, the stability test at 10 mA cm-2 for 20 h for the CoNi<INF>2</INF>S<INF>4</INF>/C<INF>3</INF>N<INF>4</INF> electrocatalyst shows no obvious decay and proves the excellent stability of CoNi<INF>2</INF>S<INF>4</INF>/C<INF>3</INF>N<INF>4</INF>. In this work, the unique tentacle-like CoNi<INF>2</INF>S<INF>4</INF>/C<INF>3</INF>N<INF>4</INF> nanowire nanostructure leads to minimized interfacial resistance and abundant channels during electrocatalysis. Moreover, comprehensive analysis results show that Ni(Co)OOH active sites, which are beneficial for excellent OER activity, partially form on the surface of CoNi<INF>2</INF>S<INF>4</INF>/C<INF>3</INF>N<INF>4</INF> during electrocatalysis. Finally, the CoNi<INF>2</INF>S<INF>4</INF>/C<INF>3</INF>N<INF>4</INF>parallel to CoNi<INF>2</INF>S<INF>4</INF>/C<INF>3</INF>N<INF>4</INF> two-electrode system is constructed and it exhibits a low-voltage water splitting capability of 1.40 V.

引用

页码：8456 / 8465

页数：10

共 80 条

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