期刊
SUSTAINABLE ENERGY & FUELS
卷 4, 期 6, 页码 2900-2906出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0se00399a
关键词
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资金
- US National Science Foundation (NSF) [CHE-18001317]
- Robert A. Welch Foundation [AH-0033]
- DoD-HBCU Program [64705CHREP]
- Ministry of Economy and Competitiveness (MINECO) of Spain [RyC-2014-14956, CTQ2017-83961-R, CTQ2017-92264-EXP]
- FEDER [UCO-1263193]
- Andalusian Government (Consejeria de Economia, Conocimiento, Empresas y Universidades, Junta de Andalucia) of Spain [UCO-1263193]
Here, we report the synthesis and characterization of crystalline C-60 nanomaterials and their applications as bifunctional water splitting catalysts. The shapes of the resulting materials were tuned via a solvent engineering approach to form rhombic-shaped nanosheets and nanotubes with hexagonal close packed-crystal structures. The as-synthesized materials exhibited suitable properties as bifunctional catalysts for HER and ORR reactions surpassing by far the electrocatalytic activity of commercially available amorphous C-60. The C-60 nanotubes displayed the most efficient catalytic performance with a small onset potential of -0.13 V vs. RHE and ultrahigh electrochemical stability properties towards the generation of molecular hydrogen. Additionally, the rotating-disk electrode measurements revealed that the oxygen reduction mechanism at the nanotube electrochemical surfaces followed an effective four-electron pathway. The improved catalytic activity was attributed to the enhanced local electric fields at the high curvature surfaces.
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