氮掺杂中空石墨烯球负载Pt催化剂的制备及其电化学性能  

Preparation and electrochemical performance of Pt supported N doping graphene hollow spheres

作　　者：黄红 郑莹莹[1] 蒋仲庆 HUANG Hong;ZHENG Yingying;JIANG Zhongqing(School of Science,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学理学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2023年第1期59-68,共10页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：国家自然科学基金项目(11975205);浙江省自然科学基金项目(LR22E070001)。

摘　　要：以模板牺牲法合成的氮掺杂中空石墨烯球(Nitrogen-doped hollow graphene spheres, NHGSs)为基体,通过硼氢化钠还原前驱体氯铂酸,在NHGSs上负载Pt纳米颗粒,获得NHGSs/Pt催化剂;采用场发射扫描电子显微镜、透射电子显微镜、X射线衍射仪、拉曼光谱分析仪、N2吸/脱附仪、X射线光电子能谱和电感耦合等离子体发射光谱仪对NHGSs及NHGSs/Pt进行形貌和结构表征,并测试其在酸性和碱性电解液中的电化学性能。结果表明:NHGSs和NHGSs/Pt具有超大的比表面积以及明显的介孔结构,有利于电荷转移并提高相应的电化学性能;在碱性电解液中,在NHGSs上负载质量分数9.72%Pt的NHGSs/Pt-2催化剂的ORR的起始电位为1.0805 V、半波电位为0.8075 V;在酸性电解液中,NHGSs/Pt-2催化剂的HER的过电位为53.5 mV;在Pt实际负载量只有9.72%的情况下,NHGSs/Pt催化剂的性能就能达到甚至超过质量分数20%商用材料Pt/C的性能。该研究为提升电极材料的催化活性、降低贵金属用量提供了新的思路。Nitrogen-doped hollow graphene spheres(NHGSs) synthesized by template sacrificial method were used as the matrix, and then Pt nanoparticles(NPs) were loaded on NHGSs by reducing the precursor chloroplatinic acid with sodium borohydride to obtain NHGSs/Pt catalyst. Scanning Electron Microscope(SEM), Transmission electron microscope(TEM), X-ray diffractometer(XRD), Raman spectrometer(Raman), Nitrogen adsorption and desorption instrument, X-ray photoelectron spectroscopy(XPS) and Inductive coupled plasma emission spectrometer(ICP) were used to characterize the morphology and structure of the substrate and catalyst. The results have shown that NHGSs and NHGSs/Pt have large specific surface area and obvious mesoporous structure, which are conducive to charge transfer and the improvement of the corresponding electrochemical performance. The onset potential of NHGSs/Pt-2 catalyst for ORR reached 1.0805 V and the half-wave potential reached 0.8075 V in alkaline electrolyte, while the overpotential of HER for NHGSs/Pt-2 catalyst was 53.5 mV. When the actual loading of Pt was only 9.72%, the performance of NHGSs/Pt catalyst could reach or even exceed the performance of the commercial Pt/C catalyst with 20% mass fraction, providing new ideas for improving the catalytic activity of electrode materials and reducing the amount of precious metals.

关 键 词：石墨烯 聚苯乙烯微球 三维中空结构 氮掺杂 电化学性能 Pt纳米颗粒 

分 类 号：TM912[电气工程—电力电子与电力传动]