MXene负载CoP纳米棒高效电催化分解水制氢  

Highly efficient electrocatalytic water splitting by MXene supported CoP nanorods

作　　者：万成凤 李志达 张春月 路璐 WAN Chengfeng;LI Zhida;ZHANG Chunyue;LU Lu(School of Civil and Environmental Engineering,Harbin Institute of Technology,Shenzhen 518055,Guangdong,China;State Key Laboratory of Urban Water Resources and Water Environment,Harbin Institute of Technology,Harbin 150090,Heilongjiang,China)

机构地区：[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

出　　处：《化工进展》2024年第6期3232-3239,共8页Chemical Industry and Engineering Progress

基　　金：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)。

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Ti_(2)C上生长的CoP纳米棒(CoP NRs/Ti_(2)C)。在碱性条件下(1mol/L KOH),反应电流密度为10mA/cm2时,CoP NRs/Ti_(2)C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/Ti_(2)C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/Ti_(2)C,为促进过渡金属磷化物取代贵金属提供了一种新的策略。Transition metal phosphide(TMP)shows great potential in catalyzing electrochemical water splitting for hydrogen(H_(2))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/Ti_(2)C)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/Ti_(2)C required significantly reduced overpotentials for both the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)to maintain a current density of 10mA/cm^(2),with values of 105mV and 320mV,respectively.In comparison,CoP NRs required higher overpotentials(157mV for HER and 350mV for OER).Furthermore,CoP NRs/Ti_(2)C 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/Ti_(2)C,a remarkably low external voltage of only 1.62V was sufficient to achieve 10mA/cm^(2).Collectively,these findings verified the substantial enhancement in electrocatalytic performance facilitated by the Ti_(2)C 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.

关 键 词：电化学 催化作用 制氢 催化剂载体 磷化钴 

分 类 号：O646[理学—物理化学]