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Citation: SUN Dun, HE Jian-Ping, ZHOU Jian-Hua, WANG Tao, DI Zhi-Yong, DING Xiao-Chun. Galvanic Replacement Strategy for a Core-Shell Like Ni-Pt Electrocatalyst with High Pt Utilization[J]. Acta Physico-Chimica Sinica, ;2010, 26(05): 1219-1224. doi: 10.3866/PKU.WHXB20100507 shu

Galvanic Replacement Strategy for a Core-Shell Like Ni-Pt Electrocatalyst with High Pt Utilization

1.
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautic, Nanjing 210016, P. R. China

Received Date: 6 September 2009
Available Online: 23 March 2010

A highly active and well-dispersed nanoscale Ptshell-Nicore/XC-72 electrocatalyst was synthesized. The Ni-core was reduced by NaH2PO2, followed by an in situ galvanic replacement to yield a Ni-Pt core-shell like structure. Complete coverage of the Ni core by a Pt shell was confirmed by various techniques including transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-visible (UV-Vis) spectrophotometry, and cyclic voltammetry (CV). A probe reaction of hydrogen electrooxidation showed that the electrocatalytically active surface area of Ptshell-Nicore/XC-72 is 1.2 times as large as that of Pt/C (JM), even though its theoretical Pt loading is only 40% that of Pt/C (JM). This improvement in activity is attributed to the interaction between the Pt shell and the Ni core.
- Electrocatalyst,
- Ptshell-Nicore/XC-72,
- Core-shell like structure,
- Pt utilization
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