铂负载介孔碳球的制备及其电催化析氢性能分析  

Preparation of Pt-loaded mesoporous carbon spheres and analysis of their hydrogen evolution reaction performance

作　　者：杜加信 薛强宇 司银松 DU Jiaxin;XUE Qiangyu;SI Yinsong(School of Materials Science&Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学材料科学与工程学院,杭州310018

出　　处：《浙江理工大学学报(自然科学版)》2025年第1期10-19,共10页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(52003243)。

摘　　要：为制备具有较低铂(Pt)负载量的碳铂催化剂并提高其电催化析氢(HER)性能,采用一种简单的硬模板法制备了铂负载介孔碳球催化剂。通过调控添加试剂的间隔时间t(t=2,8,16,32 min)制备得到具有不同核壳结构的介孔二氧化硅微球(SiO_(2)-t);然后以其为模板,以盐酸多巴胺为碳前驱体,制成具有不同形貌结构的铂负载介孔碳球催化剂(Pt/C-t)。利用SEM、TEM和BET表征制备所得Pt/C-t微球的形貌和结构,通过电化学测试分析Pt/C-t微球的电催化析氢性能。结果表明:Pt/C-2和Pt/C-8微球表面具有较好的放射状介孔,而Pt/C-16和Pt/C-32微球形成凹凸不平的结构。在Pt纳米粒子理论负载量为3.19%(质量分数)的情况下,Pt/C-32微球表现出了最佳的HER性能,10 mA/cm^(2)电流密度条件下过电势降至22.24 mV,Tafel斜率为56.23 mV/dec,电荷转移电阻为4.58Ω,双电层电容值Cdl为36.95 mF/cm^(2)。Pt/C-8、Pt/C-16、Pt/C-32的过电势均优于Pt负载量为20%(质量分数)的商业Pt/C催化剂,反映出制备所得铂负载介孔碳球具有较高的电催化性能。该研究结果为开发高电催化析氢效率的碳铂催化剂提供了重要参考。To obtain carbon-platinum catalysts with low platinum(Pt)loading and to enhance their electrocatalytic hydrogen evolution performance,this study employed a simple hard template method to synthesize Pt-loaded mesoporous carbon sphere catalysts.By controlling the interval time of adding reagents t(t=2,8,16,32 min),mesoporous silica microspheres(SiO_(2)-t)with different core-shell structures were prepared.These microspheres were then used as templates and hydrochloric acid dopamine as a carbon precursor to synthesize platinum-loaded mesoporous carbon sphere catalysts(Pt/C-t)with varying morphological structures.The morphology and structure of the Pt/C-t microspheres were characterized by SEM,TEM,and BET,while the hydrogen evolution reaction performance was analyzed through electrochemical tests.The results showed that Pt/C-2 and Pt/C-8 microspheres had better radial mesopores,whereas Pt/C-16 and Pt/C-32 microspheres formed uneven structures.At a theoretical platinum nanoparticle loading of 3.19%(mass fraction),Pt/C-32 microspheres exhibited the best hydrogen evolution reaction performance,with an overpotential reduced to 22.24 mV at a current density of 10 mA/cm^(2),a Tafel slope of 56.23 mV/dec,a charge transfer resistance of 4.58Ω,and a double-layer capacitance(Cdl)of 36.95 mFc/m^(2).The overpotentials of Pt/C-8,Pt/C-16,and Pt/C-32 were all superior to those of the commercial Pt/C catalyst with a Pt loading of 20%(mass fraction),validating the high electrocatalytic performance of the synthesized platinum-loaded mesoporous carbon spheres.The results of this article provide important reference for developing carbon-platinum catalysts with high electrocatalytic efficiency for hydrogen evolution.

关 键 词：硬模板 铂负载 介孔碳球 电催化 析氢性能 

分 类 号：TS332[轻工技术与工程]