Cu_(2-x)S@C纳米复合材料的制备及其电催化析氢性能  

Synthesis and electrocatalytic hydrogen evolution performance of Cu_(2-x)S@C nanocomposites

作　　者：史桂梅[1] 倪佳瑶 SHI Guimei;NI Jiayao(School of Science,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学理学院,沈阳110870

出　　处：《沈阳师范大学学报(自然科学版)》2024年第6期497-503,共7页Journal of Shenyang Normal University:Natural Science Edition

基　　金：辽宁省科技厅自然科学基金资助项目(20180550564)。

摘　　要：利用直流电弧法与硫化技术,设计构建了阳离子空位及核壳结构Cu_(2-x)S@C纳米复合材料,用于电催化析氢。研究表明:Cu_(2-x)S@C的阳离子空位和核壳协同作用优化了它们的氢吸附自由能,加速了水的电子转移和快速裂解,从而获得了对析氢反应的高效催化活性。在电流密度为10 mA cm^(-2)时,Cu_(2-x)S@C的过电位低至99 mV,相应的Tafel斜率为65 mV。此外,Cu_(2-x)S@C在实验中表现出良好的稳定性。In this study,we present a novel core-shell structure involving Cu_(2-x)S@C nanohybrid catalysts.These nanohybrids were synthesized using arc-discharge methods followed by vulcanization.The Cu_(2-x)S@C nanohybrids exhibit an increased number of cation vacancies and take advantage of the core-shell synergy,which enhances their hydrogen adsorption free energy,expedites electron transfer,and accelerates the cleavage of H 2O.Consequently,they demonstrate remarkable catalytic efficiency for the hydrogen evolution reaction.The overpotential of CuCu_(2-x)S@C was remarkably low at only 99 mV when achieving a current density of 10 mA cm^(-2),and the corresponding Tafel slope was measured at 65 mV.Furthermore,these nanohybrids exhibit exceptional long-term stability under testing conditions.

关 键 词：Cu2-xS@C 阳离子空位 核壳结构 析氢反应 

分 类 号：O343.1[理学—固体力学] O341[理学—力学]