Chemical Industry and Engineering Progress ›› 2024, Vol. 43 ›› Issue (6): 3232-3239.DOI: 10.16085/j.issn.1000-6613.2023-0789

• Materials science and technology • Previous Articles    

Highly efficient electrocatalytic water splitting by MXene supported CoP nanorods

WAN Chengfeng1(), LI Zhida1, ZHANG Chunyue1, LU Lu1,2()   

  1. 1.School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, Guangdong, China
    2.State Key Laboratory of Urban Water Resources and Water Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
  • Received:2023-05-11 Revised:2023-09-06 Online:2024-07-02 Published:2024-06-15
  • Contact: LU Lu

MXene负载CoP纳米棒高效电催化分解水制氢

万成凤1(), 李志达1, 张春月1, 路璐1,2()   

  1. 1.哈尔滨工业大学(深圳)土木与环境工程学院,广东 深圳 518055
    2.哈尔滨工业大学城市水资源与水环境 国家重点实验室,黑龙江 哈尔滨 150090
  • 通讯作者: 路璐
  • 作者简介:万成凤(1999—),女,硕士研究生,研究方向为电催化。E-mail:21s054047@stu.hit.edu.cn
  • 基金资助:
    国家自然科学基金面上项目(22176046);广东省自然科学基金面上项目(2022A1515012016);深圳市自然科学基金面上项目(JCYJ20210324124209025)

Abstract:

Transition metal phosphide (TMP) shows great potential in catalyzing electrochemical water splitting for hydrogen (H2) production. By combining the exceptional electrical conductivity of MXene and the high catalytic activity of TMP, this study aims to enhance the overall performance towards water electrolysis. Specifically, cobalt phosphide nanorods supported by MXene (CoP NRs/Ti2C) were synthesized through a three-step procedure involving molten salt etching, hydrothermal treatment, and in-situ phosphidation. Under alkaline conditions (1mol/L KOH), CoP NRs/Ti2C required significantly reduced overpotentials for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) to maintain a current density of 10mA/cm², with values of 105mV and 320mV, respectively. In comparison, CoP NRs required higher overpotentials (157mV for HER and 350mV for OER). Furthermore, CoP NRs/Ti2C demonstrated more favorable reaction kinetics, by lower Tafel slopes (63.4mV/dec for HER and 54.6mV/dec for OER) when compared to CoP NRs (79.6mV/dec for HER and 60.8mV/dec for OER). In a two-electrode configuration employing CoP NRs/Ti2C, a remarkably low external voltage of only 1.62V was sufficient to achieve 10mA/cm². Collectively, these findings verified the substantial enhancement in electrocatalytic performance facilitated by the Ti2C support for CoP NRs. Consequently, this study put forth a viable strategy for further improving the catalytic capabilities of TMP, with the potential to supplant noble metal catalysts in hydrogen generation applications.

Key words: electrochemistry, catalysis, hydrogen production, catalyst support, cobalt phosphide

摘要:

过渡金属磷化物在电催化分解水制氢方面具备巨大的潜力,结合MXene优异的导电性能和过渡金属磷化物高效的催化性能,有望大幅提升电解水效能。本研究通过熔盐刻蚀、水热、原位磷化的方法合成了一种在MXene材料Ti2C上生长的CoP纳米棒(CoP NRs/Ti2C)。在碱性条件下(1mol/L KOH),反应电流密度为10mA/cm2时,CoP NRs/Ti2C催化析氢反应(hydrogen evolution reaction,HER)和析氧反应(oxygen evolution reaction,OER)所需的过电位分别为105mV和320mV,远低于CoP纳米棒(157mV和350mV),且在HER和OER过程中具有更小的Tafel斜率(63.4mV/dec和54.6mV/dec)。在全解水过程中,CoP NRs/Ti2C达到电流密度10mA/cm2时所需的外加电压仅为1.62V。综上,本文提供了一种高性能全解水电催化剂CoP NRs/Ti2C,为促进过渡金属磷化物取代贵金属提供了一种新的策略。

关键词: 电化学, 催化作用, 制氢, 催化剂载体, 磷化钴

CLC Number: 

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