Synergistic Catalytic Effect of Hollow Carbon Nanosphere and Silver Nanoparticles for Oxygen Reduction Reaction

• Published in: ChemistrySelect (Weinheim) Vol. 5; no. 27; pp. 8099 - 8105
• Main Authors: Guo, Zhongqin, Zhang, Haizhou, Ma, Xiaochun, Zhou, Xiaoming, Liang, Dong, Mao, Jianfeng, Fang, Hengyi, Yu, Jiemei, Sun, Yue, Huang, Taizhong
• Format: Journal Article
• Language: English
• Published: 23.07.2020
• Subjects: Catalysis; Hollow carbon nanosphere; Oxygen reduction reaction; Silver; Synergistic effect
• ISSN: 2365-6549; 2365-6549
• DOI: 10.1002/slct.202001851

Developing low‐cost and high‐performance catalysts for oxygen reduction reaction (ORR) is critical for fuel cell applications. In this study, hollow carbon nano‐spheres (HCNS) are synthesized by a hydrothermal method and used as the support for silver nano‐particles (Ag@HCNS) as the ORR catalyst. The morphology of Ag@HCNS is investigated by the transmission electron microscopy (TEM), scanning electron microscopy (SEM) and other methodologies. Results show that the silver nanoparticles with a diameter from 3 to 6 nm are evenly distributed on the surface of HCNS. The catalytic performances of the HCNS and Ag@HCNS for ORR are investigated by cyclic voltammetry, linear sweeping voltammetry, rotating disc and rotating ring disc electrode tests. The synergistic effect between HCNS and Ag nanoparticles plays the major role on the high catalytic activity of Ag@HCNS for ORR. The onset potential of Ag@HCNS (0.82 V v.s. RHE) catalyzed ORR is close to that of Pt/C catalyst. In addition, the reaction kinetics study shows that the Ag@HCNS catalyzed ORR major proceeds through 4‐electron style. This paper promotes the understanding of the happening mechanism of ORR on the surface of novel carbon supported metal nanoparticles. The catalyst of hollow carbon nano‐spheres, which are derived through hydrothermal synthesis method from glucose, supported Ag nano‐particles (Ag@HCNS) are obtained. The synergistic effect of Ag and hollow carbon nano‐sphere improves the comprehensive catalytic performance of Ag@HCNS for oxygen reduction reaction that major happens through 4‐electron pathway. The synergistic effect of Ag and hollow carbon nano‐sphere also inhibits the oxide of Ag nano‐particles that prolongs the life of the catalysts.