Journal
RSC ADVANCES
Volume 4, Issue 77, Pages 41152-41158Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra05607h
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Funding
- National Basic Research Program of China [2011CB605702]
- NSF of China [50573014, 50773012, 51173027]
- Shanghai Nanotechnology Program [1052nm00400]
- Shanghai Basic Research Program [14JC1400600]
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A series of PtxCo1-x bimetallic nanoparticles (NPs) were deposited on polyethyleneimine (PEI) decorated graphene oxide (GO) by a simple co-reduction method. The PEI molecules facilitated the uniform distribution of bimetallic NPs (similar to 2.3 nm) on GO. PEI-GO/Pt0.17Co0.83 showed extraordinary catalytic properties: a total turnover frequency of 377.83 mol(H2) min(-1) mol(metal)(-1), a hydrogen generation rate of 111.28 L-H2 min(-1) g(metal)(-1) at 298 K, an activation energy of 51.6 kJ mol(-1) and good recyclability (similar to 80% of the original activity after five cycles). The synergistic effect between Pt and Co, and the small size of these NPs play important roles in improving their catalytic properties. Such low-cost, recyclable bimetallic catalysts will enable many practical applications in portable devices and fuel cells.
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