Hollow-Structure Pt-Ni Nanoparticle Electrocatalysts for Oxygen Reduction Reaction

• Published in: Molecules (Basel, Switzerland) Vol. 27; no. 8; p. 2524
• Main Authors: Wang, Quan, Mi, Baosen, Zhou, Jun, Qin, Ziwei, Chen, Zhuo, Wang, Hongbin
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 14.04.2022; MDPI
• Subjects: Accelerated tests; Carbon; carbon-free; Catalysts; Chemical reduction; Corrosion; Durability; electrocatalyst; Electrocatalysts; Energy; hollow structure; Kinetics; Nanoparticles; oxygen reduction reaction; Oxygen reduction reactions; PEMFC; Performance evaluation; Reaction kinetics; Silicon dioxide; carbon-free; electrocatalyst; PEMFC; hollow structure; oxygen reduction reaction
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules27082524

An electrocatalyst with high oxygen reduction reaction (ORR) activity and high stability during start-stop operation is necessary. In this paper, hollow-structure Pt-Ni electrocatalysts are investigated as ORR catalysts. After synthesis via sacrificial SiO template method, the electrocatalyst exhibits much higher specific activity (1.88 mA/cm ) than a commercial Pt/C catalyst. The mass activity (0.49 A/mg) is 7 times higher than the commercial Pt/C catalyst. The kinetics of the ORR is evaluated using Tafel and K-L plots. It also exhibits a higher durability than commercial Pt/C catalyst during accelerated durability test (ADT). Moreover, the electrocatalyst shows good resistance against accelerated durability test for start-stop, the specific activity and mass activity drops 34.6% and 40.8%, respectively, far better than the commercial catalyst.