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Facilitating the C–C bond cleavage on sub-10 nm concavity-tunable Rh@Pt core–shell nanocubes for efficient ethanol electrooxidation.
- Source :
- Journal of Materials Chemistry A; 8/14/2019, Vol. 7 Issue 30, p17987-17994, 8p
- Publication Year :
- 2019
-
Abstract
- Sluggish C–C bond cleavage during the ethanol oxidation reaction (EOR) in acidic media results in a lowered energy yield and gravely hinders the commercialization of direct ethanol fuel cells. Here we report an elaborate synthesis of sub-10 nm concavity-tunable Rh@Pt core–shell nanocubes with an engineered Rh–Pt interface and Pt atomic surface steps to facilitate the C–C bond cleavage in the EOR. Using a microsyringe pump, the surface concavity of the Rh@Pt core–shell nanocubes is successfully manipulated through kinetically adjusting the ratio of the atom deposition rate and surface diffusion rate (V<subscript>dep.</subscript>/V<subscript>diff.</subscript>) during the overgrowth process. Compared to the samples with shallow surface concavity and a flat surface, the deeper concaved Rh@Pt core–shell nanocubes possess richer surface Pt atomic steps and exhibit a greater enhancement in EOR catalysis, achieving mass activity and specific activity that are 3.74 times and 6.89 times higher than those of the state-of-the-art Pt/C catalysts, respectively. Electrochemical in situ FTIR studies indicate that the Rh–Pt interfacial interaction and the surface Pt atomic steps on the Rh@Pt concave nanocubes can effectively facilitate the C–C bond cleavage towards the complete oxidation of ethanol to CO<subscript>2</subscript>. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 7
- Issue :
- 30
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 137799242
- Full Text :
- https://doi.org/10.1039/c9ta04867g