Platinum Coated Copper Nanowires and Platinum Nanotubes as Oxygen Reduction Electrocatalysts

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• 作者：Shaun M. Alia ; Kurt Jensen ; Christian Contreras ; Fernando Garzon ; Bryan Pivovar ; Yushan Yan
• 刊名：ACS Catalysis
• 出版年：2013
• 出版时间：March 1, 2013
• 年：2013
• 卷：3
• 期：3
• 页码：358-362
• 全文大小：292K
• 年卷期：v.3,no.3(March 1, 2013)
• ISSN：2155-5435

文摘

Platinum (Pt) coated copper (Cu) nanowires (Pt/CuNWs) are synthesized by the partial galvanic displacement of Cu nanowires (CuNWs) with a Pt loading of 18 wt %. Pt/CuNWs have an outer diameter of 100 nm, a length of 25鈥?0 渭m, and a theoretical Pt layer thickness of 2 nm. Cu templated Pt nanotubes (PtNTs (Cu)) with a wall thickness of 11 nm, an outer diameter of 100 nm, and a length of 5鈥?0 渭m are synthesized by the complete galvanic displacement of CuNWs. CuNWs are synthesized by the hydrazine reduction of Cu nitrate in sodium hydroxide. Oxygen reduction reaction (ORR) and durability experiments are conducted on Pt/CuNWs, PtNTs (Cu), silver templated PtNTs (Ag), and carbon supported Pt nanoparticles (Pt/C) to evaluate catalyst activity for use as proton exchange membrane fuel cell cathodes. The ORR area activities of Pt/CuNWs and PtNTs (Cu) are 1.501 and 1.506 mA cm_Pt^鈥?, respectively. Pt/CuNWs produce a dollar activity of 9.8 A $^鈥? (dollar activity calculated from the DOE mass activity target for 2017鈥?020 of 0.44 A mg_PGM^鈥?). Durability testing of each catalyst shows improved retention of surface area and ORR activity in comparison to Pt/C.

Keywords:

proton exchange membrane fuel cells; platinum nanotubes; core shell catalysts