Versatile nanoporous bimetallic phosphides towards electrochemical water splitting

Alloying is an important approach to improving catalytic activities and realizing new functions of heterogeneous catalysts, which has extensively been employed in fabricating noble metal based bimetallic catalysts. However, it is technically unviable in the synthesis of alloyed transition metal comp...

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Bibliographic Details
Published in:Energy & environmental science 2016-01, Vol.9 (7), p.2257-2261
Main Authors: Tan, Yongwen, Wang, Hao, Liu, Pan, Shen, Yuhao, Cheng, Chun, Hirata, Akihiko, Fujita, Takeshi, Tang, Zheng, Chen, Mingwei
Format: Article
Language:English
Subjects:
Bimetals
Catalysis
Catalysts
Catalytic activity
Nanostructure
Phosphides
Synthesis (chemistry)
Water splitting
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Summary:Alloying is an important approach to improving catalytic activities and realizing new functions of heterogeneous catalysts, which has extensively been employed in fabricating noble metal based bimetallic catalysts. However, it is technically unviable in the synthesis of alloyed transition metal compounds, which are emerging as important catalysts for water splitting, in a controllable manner using conventional wet chemical methods. Here we report nanoporous bimetallic (Co 1− x Fe x ) 2 P phosphides with controllable compositions and tuneable porosity, which are fabricated by the combination of metallurgical alloy design and electrochemical etching. By tailoring the Co/Fe ratios and nanoporosity, the bimetallic phosphides exhibit versatile catalytic activities towards HER and OER in acidic and basic electrolytes. As both the cathode and the anode of an electrolyser, nanoporous (Co 0.52 Fe 0.48 ) 2 P shows an outstanding performance in water electrolysis, comparable to the commercial electrolyser with paired Pt/C and IrO 2 catalysts. Nanoporous bimetallic (Co 1− x Fe x ) 2 P phosphides with tuneable Co/Fe ratios exhibit versatile catalytic activities for highly efficient electrochemical water splitting.
ISSN:1754-5692
1754-5706
DOI:10.1039/c6ee01109h