Journal
ACS APPLIED ENERGY MATERIALS
Volume 1, Issue 2, Pages 411-420Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.7b00081
Keywords
formic acid oxidation; Pd-based electrocatalysts; self-assembly; pH; heteropolyacid
Funding
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China
- Chongqing Natural Science Foundation [cstc2015jcyjA50029]
- Fundamental Research Funds for the Central Universities [XDJK2017B057]
- Southwest University, China [SWU114090]
- Program for Innovation Team Building at Institutions of Higher Education in Chongqing [CXTDX201601011]
- Chongqing Engineering Research Center for Micro-Nano Biomedical Materials and Devices
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The in situ growth of Pd nanoflowers on pristine graphene is achieved using phosphomolybdic acid (HPMo) to mediate self-assembly. The HPMo serves simultaneously as a linker, stabilizer, and structure-directing agent, and the nanoflowers are formed by kinetically controlled growth. When the resulting material, Pd nanoflowers on HPMo-modified graphene (HPMo-G) support, is used to catalyze the formic acid oxidation reaction (FAOR), much higher catalytic activity and durability are found than with HPMo-G supported Pd nanospheres, graphene supported Pd nanoparticles, and commercial Pd/C catalysts. The catalytic activity for Pd nanoflowers on HPMo-G is also among the highest reported for Pd-based catalysts. The superior electrocatalytic performance is attributed to the unique nanoflower shape, a promotion by the HPMo mediator, and the excellent support properties of pristine graphene. The use of HPMo to mediate self-assembly of metals on graphene can be extended to fabricate other hybrid nanostructures promising broad applicability.
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