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Indexed by:期刊论文

Date of Publication:2021-01-31

Journal:RSC ADVANCES

Volume:9

Issue:5

Page Number:2803-2811

ISSN No.:2046-2069

Key Words:Catalyst activity; Chemical vapor deposition; Electrolytic reduction; Energy dispersive spectroscopy; Fuel cells; Graphite; High resolution transmission electron microscopy; Oxygen; Potassium hydroxide; Scanning electron microscopy; X ray photoelectron spectroscopy, Electrocatalytic oxygen reduction; Elemental compositions; Hot-filament chemical vapor deposition; Methanol tolerance; Moderate concentration; Oxygen reduction reaction; Scanning electrons; Surface chemical state, Carbon films

Abstract:In this article, surface-modified graphite materials as cathodic catalysts are prepared by hot filament chemical vapor deposition and then chemically etched by KOH solution. Surface morphology, elemental composition, microstructure and surface chemical state of the modified graphite films are characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy techniques. Results indicate that the surface of the pristine graphite can be refined to effectively improve the surface area by etching using the KOH solution with a moderate concentration. The graphite catalyst etched with 4.8 mg mL(-1) KOH solution shows a higher catalytic activity for the oxygen reduction reaction and a superior methanol tolerance than that of the un-etched and the other etched graphite catalysts. The stability of the etched graphite materials needs to be improved.