Affiliation:
1. Key Laboratory of Materials Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China
2. School of Environmental Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China
Abstract
AbstractCommercial Pt/C (Com. Pt/C) electrocatalysts are considered optimal for oxygen reduction and hydrogen evolution reactions (ORR and HER). However, their high Pt content and poor stability restrict their large‐scale application. In this study, photocatalytic synthesis was used to reduce ultrafine Pt nanoparticles in‐situ on a composite support of TiO2‐decorated nitrogen‐doped carbon (TiO2−NC). The nitrogen‐doped carbon had a large surface area and electronic effects that ensured the uniform dispersion of TiO2 nanoparticles to form a highly photoactive and stable support. TiO2−NC served as a composite support that enhanced the dispersibility and stability of ultrafine Pt electrocatalyst, owing to the presence of N sites and the strong metal‐support interaction. Relative to Com. Pt/C, the as‐obtained Pt/TiO2−NC had positive shifts of 44 and 10 mV in the ORR half‐wave potential and HER overpotential at −10 mA cm−2, respectively. After an accelerated durability test, Pt/TiO2−NC had lower losses in electrochemical specific area (0.7 %) and electrocatalytic activity (0 mV shift) than Com. Pt/C (25.6 %, 22 mV shift). These results indicate that the developed strategy enabled the facile synthesis and stabilization of ultrafine Pt nanoparticles, which improved the utilization efficiency and long‐term stability of Pt‐based electrocatalysts.
Funder
National Natural Science Foundation of China
Subject
General Energy,General Materials Science,General Chemical Engineering,Environmental Chemistry
Cited by
3 articles.
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