无机材料学报 ›› 2023, Vol. 38 ›› Issue (7): 823-829.DOI: 10.15541/jim20220688 CSTR: 32189.14.10.15541/jim20220688

所属专题: 【能源环境】氢能材料(202409)

• 研究论文 • 上一篇    下一篇

片状NiFeCo-LDH-Ti6C3.75复合催化剂的制备及电催化析氧性能

李光兰(), 王天宇, 刘一辰, 路中发   

  1. 大连理工大学 化工学院, 精细化工国家重点实验室, 盘锦 124221
  • 收稿日期:2022-11-17 修回日期:2023-01-19 出版日期:2023-02-01 网络出版日期:2023-02-07
  • 作者简介:李光兰(1985-), 女, 博士, 副教授. E-mail: guanglanli@dlut.edu.cn
  • 基金资助:
    国家自然科学基金(21805026)

Layered NiFeCo-LDH-Ti6C3.75 Catalyst: Preparation and Performance for Oxygen Evolution Reaction

LI Guanglan(), WANG Tianyu, LIU Yichen, LU Zhongfa   

  1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China
  • Received:2022-11-17 Revised:2023-01-19 Published:2023-02-01 Online:2023-02-07
  • About author:LI Guanglan (1985-), female, PhD, associate professor. E-mail: guanglanli@dlut.edu.cn
  • Supported by:
    National Natural Science Foundation of China(21805026)

摘要:

氧析出反应(OER)是电解水的关键反应, 但其动力学过程缓慢, 限制了电解水的快速发展。因此, 设计和构筑高效的OER催化剂对电解水至关重要。本研究以硝酸钴、硝酸镍、硝酸铁、尿素及Ti6C3.75为原料, 采用简单的一步水热法制备了片状Co2+离子掺杂的NiFe双金属氢氧化物偶联Ti6C3.75的(NiFeCo-LDH-Ti6C3.75)OER催化剂。NiFeCo-LDH-Ti6C3.75催化剂呈片状堆叠结构, 有利于暴露更多活性位点, 引入Co2+和Ti6C3.75可以降低Ni、Fe位点的电子密度。得益于此, NiFeCo-LDH-Ti6C3.75催化剂表现出优异的OER活性, 在20 mA·cm-2电流密度下的过电势仅为290 mV, 并且Tafel斜率低至87.84 mV·dec-1, 具有较快的反应动力学。并且其电荷转移电阻较低, 电荷转移速率较高。此外, NiFeCo-LDH-Ti6C3.75催化剂在20 mA·cm-2条件下经过6000圈加速老化测试后过电势仅增加约 7 mV, 表现出卓越的循环稳定性。

关键词: NiFe-LDH, 钴掺杂, Ti6C3.75掺杂

Abstract:

Oxygen evolution reaction (OER) is the key reaction for water splitting, but its slow kinetics limitsits application. Therefore, rational design and construction of efficient OER catalysts are crucial for water splitting. Here, a Co2+ ion doped NiFe layered double hydroxides coupled Ti6C3.75 (NiFeCo-LDH-Ti6C3.75) catalyst was prepared by a simple one-step hydrothermal method using cobalt nitrate, nickel nitrate, iron nitrate, urea, and Ti6C3.75 as raw materials. NiFeCo-LDH-Ti6C3.75 catalyst showed a lamellar stacking structure, which is facilitating exposing more active sites. Introduction of Co2+ and Ti6C3.75 reduced the electronic density of Ni and Fe sites of NiFeCo-LDH-Ti6C3.75 catalyst. Benefiting from these features, the NiFeCo-LDH-Ti6C3.75 catalyst exhibits excellent OER activity with an overpotential of merely 290 mV at a current density of 20 mA·cm-2 and a Tafel slope of 87.84 mV·dec-1 with faster reaction kinetics. NiFeCo-LDH-Ti6C3.75 catalyst shows a relatively low charge transfer resistance, which means a fast charge transfer efficiency. Furthermore, after 6000 cycles of accelerated aging test at 20 mA·cm-2, the overpotential only increased ~7 mV, indicating excellent cycle stability of NiFeCo-LDH-Ti6C3.75.

Key words: NiFe-LDH, Co doping, Ti6C3.75 doping

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