Dispersing Pt atoms onto nanoporous gold for high performance direct formic acid fuel cells

• Published in: Chemical science (Cambridge) 2014-01, Vol.5 (1), p.403-409
• Main Authors: Wang, Rongyue, Liu, Jianguo, Liu, Pan, Bi, Xuanxuan, Yan, Xiuling, Wang, Wenxin, Ge, Xingbo, Chen, Mingwei, Ding, Yi
• Format: Article
• Language: English
• Subjects: Catalysis; Catalysts; Formic acid; Fuel cells; Nanocomposites; Nanostructure; Platinum; Self assembly
• ISSN: 2041-6520; 2041-6539
• DOI: 10.1039/c3sc52792a

Direct formic acid fuel cells (DFAFCs) are promising portable energy conversion devices for supplying our off-grid energy demands. However, traditional Pt-based catalysts suffer from poor performance; consequently the precious metal loading in an actual fuel cell has to be maintained at a very high value, typically orders of magnitude higher than the acceptable level. Through a molecular self-assembly/electro-deposition process, Pt atoms are effectively dispersed onto the surface of a nanoporous gold substrate, and the resulting nanocomposites demonstrate superior electrocatalytic performance toward formic acid electro-oxidation, which can be attributed to a nearly ideal catalyst configuration where all the Pt atoms are involved in a highly desired direct reaction path. In both half-cell electrochemical testing and actual DFAFCs, these rationally designed electrodes show over two orders of magnitude improvement in Pt efficiency, as compared with the state-of-the-art Pt/C catalyst. This design strategy allows customized development of new generation electrocatalysts for high performance energy saving technologies.