Construction of highly-stable graphene hollow nanospheres and their application in supporting Pt as effective catalysts for oxygen reduction reaction

• 作者: Dongmei Sun Huaifang Zhang Jubing Zhang Kunhao Liu Xiaoyu Qiu Yawen Tang Yunqi Zhu
• 来源期刊: 绿色能源与环境:英文版
• 学科: 工学
• 关键词: Sacrificial TEMPLATE method 3D r-GO NANOSPHERES Highly-stable HOLLOW structure Oxygen reduction reaction
• 年，卷（期）: 2019,（3）
• 页码范围: 245-253
• 页数: 9页
• 分类号: TQ127.11

摘要

The construction and surface modification of three-dimensional(3D) graphene structures have been recognized as effective ways to prepare high-performance graphene-based composites in energy-related applications. Herein, on the basis of well-defined morphology and efficient electron conduction, the 3D highly-stable graphene hollow nanospheres have been synthesized by using sacrificial template method. The asprepared 3D graphene nanospheres exhibit superior mechanical stability, electrochemical stability, and strong hydrophobicity, which may accelerate the emission of H2O in acidic medium-based ORR. Accordingly, the 3D highly-stable graphene nanospheres are used to confine tiny Pt nanoparticles(3Dr-GO@Pt HNSs) for ORR in acidic medium, exhibiting superior activity with 4-electron-transfered pathway. Meanwhile,dramatically improved durability are achieved in terms of both ORR mass activity and electrochemically surface area compared to those of commercial Pt/C.