物理化学学报 >> 2022, Vol. 38 >> Issue (6): 2107005.doi: 10.3866/PKU.WHXB202107005

所属专题： 面向电化学储能与转化的表界面工程

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有机配体表面改性NiCo2O4纳米线用于水全分解

孙轲, 赵永青, 殷杰, 靳晶, 刘翰文, 席聘贤()   

  • 收稿日期:2021-07-02 录用日期:2021-08-13 发布日期:2021-08-30
  • 通讯作者: 席聘贤 E-mail:xipx@lzu.edu.cn
  • 基金资助:
    国家自然科学基金(21931001);国家自然科学基金(21922105);国家自然科学基金(51771085);国家自然科学基金(51801088);甘肃省引导科技创新发展专项基金项目(2019ZX-04);111项目(B20027);中央高校基本科研业务费专项资金(lzujbky-2021-pd04);中央高校基本科研业务费专项资金(lzujbky-2021-sp41);中央高校基本科研业务费专项资金(lzujbky-2021-it12);中央高校基本科研业务费专项资金(lzujbky-2021-37);中国博士后科学基金(2021M691375);国家博士后创新人才计划(BX20200157)

Surface Modification of NiCo2O4 Nanowires using Organic Ligands for Overall Water Splitting

Ke Sun, Yongqing Zhao, Jie Yin, Jing Jin, Hanwen Liu, Pinxian Xi()   

  • Received:2021-07-02 Accepted:2021-08-13 Published:2021-08-30
  • Contact: Pinxian Xi E-mail:xipx@lzu.edu.cn
  • About author:Pinxian Xi, Email: xipx@lzu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21931001);the National Natural Science Foundation of China(21922105);the National Natural Science Foundation of China(51771085);the National Natural Science Foundation of China(51801088);the Special Fund Project of Guiding Scientific and Technological Innovation Development of Gansu Province(2019ZX-04);the 111 Project(B20027);the Fundamental Research Funds for the Central Universities(lzujbky-2021-pd04);the Fundamental Research Funds for the Central Universities(lzujbky-2021-sp41);the Fundamental Research Funds for the Central Universities(lzujbky-2021-it12);the Fundamental Research Funds for the Central Universities(lzujbky-2021-37);the China Postdoctoral Science Foundation(2021M691375);the China National Postdoctoral Program for Innovative Talents(BX20200157)

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摘要：

由于水分解在绿色能源领域的重要作用，能够在碱性介质中进行析氢(HER)和析氧(OER)反应的双功能电催化剂具有重要的应用价值。本文报道一种具有丰富缺陷的表面改性NiCo2O4纳米线(NWs)，在碱性介质中作为一种高效的整体水裂解电催化剂。X射线光电子能谱(XPS)分析表明，Co2+/Co3+比值的增加是表面修饰NiCo2O4纳米线具有优异双功能电催化性能的重要原因。结果表明，在1.0 mol·L-1 KOH溶液中，通过有机配体主导的表面改性，优化后的NiCo2O4纳米线在电流密度达到10 mA·cm-2时的HER过电位仅为83 mV，OER过电位仅为280 mV。更重要的是，有机配体表面改性后的NiCo2O4纳米线表现出了出色的水分解性能，在2.1 V电压下达到了100 mA·cm-2的电流密度。目前的工作凸显了提高NiCo2O4 NWs尖晶石结构中Co2+含量对促进整体水裂解的重要性。

关键词: 双功能电催化剂, 有机配体, 界面, 表面修饰纳米线, 水全分解

Abstract:

Bifunctional electrocatalysts in alkaline media play an important role in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), owing to the considerable influence of water splitting in the green energy sector. Herein, we present surface-modified NiCo2O4 nanowires (NWs) with rich defects as a highly efficient overall water splitting electrocatalyst in alkaline media, where the surface modification is accomplished using organic ligands. X-ray photoelectron spectroscopy reveals that the increase in the Co2+/Co3+ ratio is responsible for the excellent bifunctional electrocatalytic performance of the surface-modified NiCo2O4 NWs. As expected, benefiting from the organic ligand-dominated surface modification, the optimized NiCo2O4 NWs can display an overpotential of only 83 mV for the HER and 280 mV for the OER, with a current density of 10 mA·cm-2 in 1.0 mol·L-1 KOH solution. More importantly, the NiCo2O4 NWs surface-modified using organic ligands exhibit outstanding performance for overall water splitting, with a voltage of 2.1 V and current density of 100 mA·cm-2, and also maintain their activity for at least 15 h. The present work highlights the importance of increasing the content of Co2+ in the spinel structure of NiCo2O4 NWs for enhancing their performance in overall water splitting.

Key words: Bifunctional electrocatalyst, Organic ligand, Interface, Surface modified nanowire, Water splitting