Porous Ti_(3)C_(2)T_(x)for Efficient Electrocatalytic Hydrogen Evolution Reaction  

多孔Ti_(3)C_(2)T_(x)用于高效电催化析氢反应

作　　者：LIU Ying HUI Mingming BU Fanxing LUO Wei 刘影;惠明明;卜凡兴;罗维(东华大学材料科学与工程学院,上海201620;上海大学文化遗产与信息管理学院硅酸盐质文物保护教育部重点实验室,上海200444)

机构地区：[1]College of Materials Science and Engineering,Donghua University,Shanghai 201620,China [2]Key Laboratory of Silicate Cultural Relics Conservation,Ministry of Education,School of Cultural Heritage and Information Management,Shanghai University,Shanghai 200444,China

出　　处：《Journal of Donghua University(English Edition)》2025年第1期20-28,共9页东华大学学报(英文版)

基　　金：National Outstanding Youth Science Foundation(No.52225204)。

摘　　要：MXene is an emerging class of two-dimensional(2D)layered transition metal carbides or nitrides.Due to the highly tunable components and surface functional groups,it holds great potential in electrocatalytic hydrogen evolution reaction(HER).However,MXene nanosheet suffers from a strong tendency to restack and a lack of active edge sites.In this work,the porous Ti_(3)C_(2)T_(x)was synthesized by an oxidation and etching two-step strategy and then characterized by a series of spectroscopic techniques.The obtained porous Ti_(3)C_(2)T_(x)possesses a large number of in-plane pores.This not only creates abundant active edge sites but also enhances the mass transfer and increases the accessibility of the active sites.Compared with Ti_(3)C_(2)T_(x),in a 0.5 mol/L H_(2)SO_(4)electrolyte,the porous Ti_(3)C_(2)T_(x)shows a 65.6%higher electrochemical surface area(ECSA)(440 mF/cm^(2)),a 95.2%lower charge transfer resistance(12.8Ω),and a 69.8%lower Tafel slope(144 mV/dec),and thus exhibits lower overpotential with good stability at a current density of 10 mA/cm^(2).At the same time,the HER performance of the porous Ti_(3)C_(2)T_(x)can be further enhanced by near-infrared laser irradiation based on the localized surface plasmon resonance effect.MXene是一种新兴的二维过渡金属碳化物或氮化物,具有高度可调控的组分和表面官能团,在电催化析氢反应中表现出良好的应用前景,但是MXene纳米片极易堆叠且缺乏活性边缘位点。该研究通过氧化和刻蚀两步策略合成了多孔Ti_(3)C_(2)T_(x),并采用一系列光谱学方法进行了表征。研究发现多孔Ti_(3)C_(2)T_(x)表面存在大量面内孔,这不仅增加了大量活性边缘位点,而且提高了活性位点的可及性。相比于Ti_(3)C_(2)T_(x),多孔Ti_(3)C_(2)T_(x)在0.5 mol/L H_(2)SO_(4)电解质中的电化学活性比表面积(440 mF/cm^(2))提高65.6%,电荷转移电阻(12.8Ω)降低了95.2%,塔菲尔斜率(144 mV/dec)降低了69.8%,因此在电流密度为10 mA/cm 2时表现出了更低的过电位,且具有很好的稳定性。同时,利用Ti_(3)C_(2)T_(x)的局域表面等离子体共振效应,可在近红外激光辐照下进一步提升多孔Ti_(3)C_(2)T_(x)的电催化析氢反应性能。

关 键 词：porous Ti_(3)C_(2)T_(x) hydrogen evolution reaction(HER) active edge site localized surface plasmon resonance 

分 类 号：O611[理学—无机化学]