期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 38, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202206006
关键词
full pH range; heterogeneous electrocatalysis; hydrogen evolution reactions; noble metals; yolk-shell structures
类别
资金
- Environment and Conservation Fund of Hong Kong SAR, China [ECF 2020-13]
- City University of Hong Kong [9667227]
This article reports a heterogeneous yolk-shell nanostructure with optimized electronic structure and unique nanostructure as an efficient electrocatalyst for hydrogen evolution reaction (HER) under alkaline conditions. The catalyst shows higher activity than commercial Pt/C and Rh/C catalysts.
Design of efficient and robust electrocatalysts for hydrogen evolution reaction (HER) under all pH conditions has attracted significant attention. In particular, it is still a considerable challenge since the HER kinetics of Pt in alkaline solutions is about two to three orders of magnitude lower than that in acidic conditions. Herein, a heterogeneous yolk-shell nanostructure with Rh nanoparticles embedded in S, N co-doped carbon nanospheres prepared by a facile self-template method is reported. The optimized electrocatalyst can achieve an extremely small overpotential of 13.5 mV at 10 mA cm(-2), low Tafel slope of 25.5 mV dec(-1), high turnover frequency of 0.143 s(-1) (at -75 mV vs. reversible hydrogen electrode), and long-term durability for 10 h, which is the record-high alkaline HER activity among the ever-reported noble metal based catalysts. These striking performances are ascribed to the optimized electronic structure and unique heterogeneous yolk-shell nanostructure. More importantly, it is also demonstrated that the obtained electrocatalyst exhibits superior activities in all pH range, which is better than commercial Pt/C and Rh/C catalysts. This work proves that Rh-based nanomaterials are promising superior electrocatalysts in a wide pH range and nanostructure design is a powerful tool to increase the mass/electron transfer during reaction.
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