Engineering oxygen vacancy-rich Co3O4 nanowire as high-efficiency and durable bifunctional electrocatalyst for overall alkaline water splitting

doi:10.11949/0438-1157.20200597

Abstract

Abstract:

A novel kind of vacancy-rich nanowire arrays were prepared by reducing rough Co₃O₄ nanowires with NaBH₄ solution on 3D nickel foam at room temperature for overall water splitting. Co₃O₄/NF treated by NaBH₄ for 10 min was highly active for oxygen evolution reaction (OER) and simultaneously efficient for hydrogen evolution reaction (HER) with the need of the overpotentials of 240 and 132 mV to drive 10 mA·cm^-2 in alkaline media, respectively. Furthermore, the electrocatalysts as both cathode and anode in a two-electrode system presented excellent durability for over 60 h at 10 mA·cm^-2, maintaining the cell voltage of merely 1.63 V. This work provides new methods and ideas for the preparation of transition metal oxide bifunctional electrocatalysts rich in oxygen vacancies.

Key words: oxygen vacancy, Co₃O₄, nanostructure, electrochemistry, hydrogen production, oxygen evolution reaction

摘要：

在室温下利用NaBH₄溶液还原Co₃O₄纳米线获得富含氧空位（V_O）的三维自支撑纳米线阵列用作全水解电催化剂，其中NaBH₄处理10 min的Co₃O₄/NF在碱性介质中对析氧反应（OER）和析氢反应（HER）表现出很高的活性，在10 mA·cm^-2电流密度下分别仅需240和132 mV的过电位。V_O-Co₃O₄/NF同时作为阴极和阳极电催化剂时，在10 mA·cm^-2下电解水槽电压仅为1.63 V，其耐久性可达60 h以上。该工作为富含氧空位结构的过渡金属氧化物双功能电催化剂的制备提供了新的方法和思路。

关键词: 氧空位, Co₃O₄, 纳米结构, 电化学, 制氢, 析氧反应

CLC Number:

O 646

YUAN Hefeng,MA Zizai,WANG Shumin,LI Jinping,WANG Xiaoguang. Engineering oxygen vacancy-rich Co₃O₄ nanowire as high-efficiency and durable bifunctional electrocatalyst for overall alkaline water splitting[J]. CIESC Journal, 2020, 71(12): 5831-5841.

原荷峰,马自在,王淑敏,李晋平,王孝广. 富氧空位Co₃O₄纳米线的制备及其电解水性能研究[J]. 化工学报, 2020, 71(12): 5831-5841.

Figures/Tables 9

Fig.1 XRD patterns of Co3O4/NF and VO-Co3O4/NF

Fig.2 SEM images of Co3O4/NF and VO-Co3O4/NF

Fig.3 Microstructure characterization of Co3O4/NF and VO-Co3O4/NF(The lattice fringes and amorphous domain of VO-Co3O4/NF are labeled in solid and doted ellipse respectively in (e))

Fig.4 XPS spectra of Co3O4/NF and VO-Co3O4/NF

Fig.5 HER performance of VO-Co3O4/NF in 1.0 mol·L-1 KOH

Fig.6 OER performance of VO-Co3O4/NF ((a)—(d)) andoverall water splitting performance of bifunctional VO-Co3O4/NF((e),(f))

Fig.7 XRD patterns and SEM images of VO-Co3O4/NF after OER ((a),(b)) and HER ((c),(d)) durability test, respectively

Fig.A1 Electrochemical characterization of Co3O4/NF and VO-Co3O4/NF

Fig.A2 High resolution XPS spectra of Co 2p and O 1s for VO-Co3O4/NF after OER((a),(b)) and HER((c),(d))

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Engineering oxygen vacancy-rich Co₃O₄ nanowire as high-efficiency and durable bifunctional electrocatalyst for overall alkaline water splitting

富氧空位Co₃O₄纳米线的制备及其电解水性能研究

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References 36

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