High performance layer-by-layer Pt3Ni(Pt-skin)-modified Pd/C for the oxygen reduction reaction†,Chemical Science

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High performance layer-by-layer Pt3Ni(Pt-skin)-modified Pd/C for the oxygen reduction reaction†
Chemical Science ( IF 7.6 ) Pub Date : 2018-06-26 00:00:00 , DOI: 10.1039/c8sc01358f
Jing-Fang Huang _{1,

2,

3,

4} , Po-Kai Tseng _{1,

2,

3,

4}

Affiliation

Bimetallic Pt–Ni with Pt on the outermost layer and an innermost layer enriched in Ni, referred to as Pt₃Ni(Pt-skin), is a promising configuration of an electrocatalyst for the oxygen reduction reaction (ORR) in fuel cells. We prepare a core (Pd)/shell (Pt₃Ni(Pt-skin)) catalyst (Pt₃Ni(Pt-skin)/Pd/C) from Zn underpotential deposition (UPD) on a Ni UPD modified Pd/C catalyst, facilitating Pt atomic layer-by-layer growth on the Ni surface through the galvanic replacement process. Pt₃Ni(Pt-skin)/Pd/C shows the best ORR performance, with a Pt specific activity of 16.7 mA cm⁻² and Pt mass activity of 14.2 A mg_Pt⁻¹, which are 90- and 156- fold improvements over commercial Pt/C catalysts. The Pt₃Ni(Pt-skin) structure effectively inhibits Ni leaching to improve the durability in two accelerated durability test modes mimicking the catalyst lifetime and start-up/shut-down cycles.

中文翻译：

用于氧还原反应的高性能逐层Pt ₃ Ni（Pt-皮肤）改性Pd / C †

在最外层和最内层富含Pt的双金属Pt-Ni，称为Pt ₃ Ni（Pt-skin），是用于燃料电池中氧还原反应（ORR）的一种有希望的电催化剂。我们在Ni UPD改性的Pd / C催化剂上由Zn欠电位沉积（UPD）制备核（Pd）/壳（Pt ₃ Ni（Pt-skin）/ Pt ₃ Ni（Pt-skin）/ Pd / C），通过电置换过程促进了Ni表面上Pt原子的逐层生长。Pt ₃ Ni（Pt-skin）/ Pd / C显示最佳的ORR性能，Pt比活度为16.7 mA cm ^-2，Pt质量活度为14.2 A mg _Pt^-1，比市售Pt / C催化剂分别提高了90倍和156倍。Pt ₃ Ni（Pt-skin）结构有效地抑制了Ni的浸出，从而在模仿催化剂寿命和启动/关闭循环的两种加速耐用性测试模式下提高了耐用性。

更新日期：2018-06-26

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