Evolution of composition and structure of PtRh/C in the acidic methanol electrooxidation process
PtRh alloys are highly active in the anodic methanol oxidation reaction (MOR) but few studies have looked at their evolution in the composition and structure during the catalytic process. Herein, a uniformly dispersed carbon-supported PtRh (PtRh/C) catalyst with Rh-enriched surface was synthesized v...
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doaj-00a03e48c5574d89af3ed3587fd1b98f2020-11-25T03:35:56ZengElsevierElectrochemistry Communications1388-24812020-04-01113Evolution of composition and structure of PtRh/C in the acidic methanol electrooxidation processZhaoping Shi0Xin Li1Tongfei Li2Yifan Chen3Yawen Tang4Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, PR ChinaJiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, PR ChinaJiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, PR ChinaCorresponding authors.; Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, PR ChinaCorresponding authors.; Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, PR ChinaPtRh alloys are highly active in the anodic methanol oxidation reaction (MOR) but few studies have looked at their evolution in the composition and structure during the catalytic process. Herein, a uniformly dispersed carbon-supported PtRh (PtRh/C) catalyst with Rh-enriched surface was synthesized via a facial hydrothermal method. By recording the performance of different cyclic voltammetry (CV) cycles during electrocatalytic MOR process in acid, the evolution of PtRh/C in composition and structure was elucidated. During the first 80 CV cycles, the rapid dissolution of the surface Rh atoms and the exposure of active Pt sites lead to the dramatic enhancement of the current density. When further continue the CV cycling, Pt atoms on the surface have aggregated and recombined to form a tightly aligned Pt-enriched surface. But Rh tends to be stable and catalytic performance reaches a relatively stable status with slightly decreased activity. Compared with the performance of PtRu/C catalyst, it can be concluded that PtRh/C has better stability and higher activity based on the less soluble property of Rh than Ru. Keywords: PtRh alloys, Anode catalysts, Methanol electrooxidation, Structural evolution, Compositional evolutionhttp://www.sciencedirect.com/science/article/pii/S1388248120300412 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zhaoping Shi Xin Li Tongfei Li Yifan Chen Yawen Tang |
spellingShingle |
Zhaoping Shi Xin Li Tongfei Li Yifan Chen Yawen Tang Evolution of composition and structure of PtRh/C in the acidic methanol electrooxidation process Electrochemistry Communications |
author_facet |
Zhaoping Shi Xin Li Tongfei Li Yifan Chen Yawen Tang |
author_sort |
Zhaoping Shi |
title |
Evolution of composition and structure of PtRh/C in the acidic methanol electrooxidation process |
title_short |
Evolution of composition and structure of PtRh/C in the acidic methanol electrooxidation process |
title_full |
Evolution of composition and structure of PtRh/C in the acidic methanol electrooxidation process |
title_fullStr |
Evolution of composition and structure of PtRh/C in the acidic methanol electrooxidation process |
title_full_unstemmed |
Evolution of composition and structure of PtRh/C in the acidic methanol electrooxidation process |
title_sort |
evolution of composition and structure of ptrh/c in the acidic methanol electrooxidation process |
publisher |
Elsevier |
series |
Electrochemistry Communications |
issn |
1388-2481 |
publishDate |
2020-04-01 |
description |
PtRh alloys are highly active in the anodic methanol oxidation reaction (MOR) but few studies have looked at their evolution in the composition and structure during the catalytic process. Herein, a uniformly dispersed carbon-supported PtRh (PtRh/C) catalyst with Rh-enriched surface was synthesized via a facial hydrothermal method. By recording the performance of different cyclic voltammetry (CV) cycles during electrocatalytic MOR process in acid, the evolution of PtRh/C in composition and structure was elucidated. During the first 80 CV cycles, the rapid dissolution of the surface Rh atoms and the exposure of active Pt sites lead to the dramatic enhancement of the current density. When further continue the CV cycling, Pt atoms on the surface have aggregated and recombined to form a tightly aligned Pt-enriched surface. But Rh tends to be stable and catalytic performance reaches a relatively stable status with slightly decreased activity. Compared with the performance of PtRu/C catalyst, it can be concluded that PtRh/C has better stability and higher activity based on the less soluble property of Rh than Ru. Keywords: PtRh alloys, Anode catalysts, Methanol electrooxidation, Structural evolution, Compositional evolution |
url |
http://www.sciencedirect.com/science/article/pii/S1388248120300412 |
work_keys_str_mv |
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