Watermelon-like Rh x S y @C nanospheres: phase evolution and its influence on the electrocatalytic performance for oxygen reduction reaction
作者： Yanjuan Li , Nan Li , Xiao Yan , Xiaotian Li , Runwei Wang
DOI: 10.1007/S10853-017-1294-0
关键词: Electrolysis 、 Materials science 、 Phase (matter) 、 Hydrochloride 、 Rhodium 、 Inorganic chemistry 、 X-ray photoelectron spectroscopy 、 Catalysis 、 Metal 、 Hydrochloric acid
摘要: Design and synthesis of oxygen reduction reaction (ORR) electrocatalysts with desired constituent based on understanding exploitation electrocatalytic mechanism is great significance for applications hydrochloride acid electrolysis. Herein, strongly coupled hybrid watermelon-like Rh x S y @C nanospheres has been rationally designed synthesized via a one-step solvothermal method. X-ray photoelectron spectroscopy results reveal that the rhodium element presents in mixture phase metallic Rh three sulfides, i.e., Rh17Sl5, Rh3S4 Rh2S3. The ratio phases, Rh/Rh17Sl5/Rh3S4/Rh2S3, closely related to parameter, average S/Rh molar increases along increasing temperature duration. When assessed as ORR hydrochloric acid, /C composite 29.1% Rh17S15, 45.8% 25.1% Rh2S3, where ORR-active Rh17S15 phases are up 75%, exhibits best catalytic activity stability, even outperforms Pt/C. In contrast, Rh-involved counterpart suffers from severe degradation highly corrosive environment, inactive Rh2S3 phase-dominant less active toward ORR. Our may give new impetus rational design sulfides improved performance
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