Tuning Pt-skin to Ni-rich surface of Pt₃Ni catalysts supported on porous carbon for enhanced oxygen reduction reaction and formic electro-oxidation

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• 作者：Bin-Wei Zhang^aAuthor Vitae ; Zong-Cheng Zhang^aAuthor Vitae ; Hong-Gang Liao^aAuthor Vitae ; Yue Gong^bAuthor Vitae ; Lin Gu^b ; ^cAuthor Vitae ; Xi-Ming Qu^aAuthor Vitae ; Le-Xing You^aAuthor Vitae ; Shuo Liu^aAuthor Vitae ; Long Huang^aAuthor Vitae ; Xiao-Chun Tian^aAuthor Vitae ; Rui Huang^aAuthor Vitae ; Fu-Chun Zhu^aAuthor Vitae ; Tao Liu^aAuthor Vitae ; Yan-Xia Jiang^a ; Author Vitae ; Zhi-You Zhou^aAuthor Vitae ; Shi-Gang Sun^a ; Author Vitae
• 关键词：Pt-skin ; Ni-rich ; ORR ; Surface composition ; Formic acid oxidation ; Controlled thermal treatment method
• 刊名：Nano Energy
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：19
• 期：Complete
• 页码：198-209
• 全文大小：3510 K

文摘

Controlling surface composition of bimetallic catalysts is of significance in energy conversion and storage. Here, we controlled thermal treatment to synthesize different surface composition of bimetallic catalysts with average diameter <4 nm. We report the synthesis of Pt₃Ni catalyst with Pt-skin surface directly supported on porous graphitic carbon (PC), which showed over 300% increase in mass activity compared with Pt/C for the oxygen reduction reaction (ORR). The high activity and stability are attributed to the Pt-skin structure and the morphology of PC. When we tuned the surface composition to Ni-rich, it showed 300% increase in mass activity when compared with Pt/C towards oxidizing of HCOOH. Our approach to control surface composition can be used to design nanocatalysts for different reaction and are simple, effective and promotional to be industrialized.