Investigation of PtNi/C anode electrocatalysts for direct borohydride fuel cell

✍ Scribed by Guang-jin Wang; Yun-zhi Gao; Zhen-bo Wang; Chun-yu Du; Jia-jun Wang; Ge-ping Yin

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 676 KB
• Volume: 195
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2009.06.080

✦ Synopsis

In this study, carbon-supported PtNi alloys with different molar ratios synthesized by borohydride reduction were evaluated as anode catalysts for sodium borohydride fuel cells. The higher angle shifts of the Pt peaks from X-ray diffraction (XRD) account for the alloy formation between Pt and Ni. The negative shift of Pt 4f XPS spectrum for PtNi(7:3)/C also indicates an electronic structural change of Pt in the alloyed PtNi/C catalyst. The cyclic voltammetry (CV) results show that the PtNi(x:10x)/C catalysts are electrochemically active toward borohydride oxidation at the potential range between -0.6 V and +0.1 V vs. Hg/HgO electrode, and PtNi(7:3)/C presents the strongest peak current density among three catalysts with different molar ratios. The results of amperometric i-t curves (i-t) tests also show that the steady-state current density is the highest on PtNi(7:3)/C among alloy catalysts. The higher electrocatalytic activity of the PtNi(7:3)/C can be attributed to the alloy effect and the Pt electronic structure change due to the addition of Ni.