Cu掺杂WN松枝状自支撑纳米阵列的制备及其碱性析氢性能的研究  

Preparation of Cu-Doped WN Nanoarrays and Study on Their Hydrogen Evolution Performance

作　　者：李乐乐 申丽莎 涂志明 卢卓信 谭弘毅[2] 杨轶 闫常峰 LI Lele;SHEN Lisha;TU Zhiming;LU Zhuoxin;TAN Hongyi;YANG Yi;YAN Changfeng(School of Energy Science and Engineering,University of Science and Technology of China,Hefei Anhui 230026,China;Guangzhou Institute of Energy Conversion,Chinese Academy of Science,Guangzhou Guangdong 510640,China)

机构地区：[1]中国科学技术大学能源科学与技术学院,安徽合肥230026 [2]中国科学院广州能源研究所,广东广州510640

出　　处：《石油化工高等学校学报》2024年第4期57-65,共9页Journal of Petrochemical Universities

基　　金：国家自然科学基金项目(52276222);中国科学院国际伙伴计划项目(118GJHZ2022029MI);广州市科技计划项目(2024A04J4818,202103040002,202206050003);安徽省重点研发项目(2023t07020022)。

摘　　要：以偏钨酸铵、乙酸铜等为原料,通过控制掺杂比,采用简单的水热法,合成了形貌不同的前驱体,随后结合高温退火法,在碳纸上成功实现了Cu掺杂WN松枝状自支撑纳米阵列(Cu-WN-5:1)的原位生长;利用SEM、TEM、XRD、XPS等测试手段对样品的形貌和结构进行表征分析,进而利用电化学测试方法评估了催化剂的析氢性能。结果表明,W和Cu的掺杂比(n(W)/n(Cu))对催化剂的析氢性能具有重大影响;当n(W)/n(Cu)为5:1时,催化剂具有最优的析氢活性;Cu元素的成功掺杂改变了WN的电子结构,增加了其活性位点的数量,加速催化过程中的电荷转移速率,从而提升了材料的HER活性;Cu-WN-5:1在KOH浓度为1.0 mol/L、电流密度为10 mA/cm^(2)时所需的过电位为195 mV,Tafel斜率为192 mV/dec,说明Cu-WN-5:1具有较快的电化学析氢反应动力学速率;该材料在KOH浓度为1.0 mol/L的条件下持续反应36 h,表现出优异的长期稳定性。Using ammonium metatungstate and copper acetate as raw materials,the precursors with different morphology were synthesized by a simple hydrothermal method by controlling the doping ratio.Then,combined with high temperature annealing method,the in-situ growth of Cu-WN-5∶1 was successfully realized on carbon paper.The morphology and structure of the samples were characterized by SEM,TEM,XRD and XPS,and then the hydrogen evolution performance of the catalyst was evaluated by electrochemical testing methods.The results show that the doping ratio of W and Cu(n(W)/n(Cu))has a significant effect on the hydrogen evolution performance of the catalyst,in which the optimal hydrogen precipitation activity is achieved when n(W)/n(Cu)is 5∶1.The successful doping of Cu increases the number of active sites by changing the electronic structure of WN,accelerates the charge transfer rate in the catalytic process,which in turn improves the HER activity of the material.The required overpotential of Cu-WN-5∶1 at 1.0 mol/L KOH with a current density of 10 mA/cm^(2)is 195 mV,and the Tafel slope is 192 mV/dec,which indicates that Cu-WN-5∶1 has a fast kinetic rate of electrochemical hydrogen precipitation reaction;the material has been continuously reacted for 36 h under the condition of 1.0 mol/L KOH,and it exhibits excellent long-term stability.

关 键 词：氮化钨 过渡金属掺杂 碱性析氢 电催化 阵列结构 

分 类 号：TQ116.21[化学工程—无机化工]