Tetrahexahedral Pt Nanoparticles: Comparing the Oxygen Reduction Reaction under Transient vs Steady-State Conditions
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- 作者：Yu-Jia Deng ; Gustav Karl Henrik Wiberg ; Alessandro Zana ; Shi-Gang Sun ; Matthias Arenz
- 刊名：ACS Catalysis
- 出版年：2017
- 出版时间：January 6, 2017
- 年：2017
- 卷：7
- 期：1
- 页码：1-6
- 全文大小：413K
- ISSN：2155-5435
文摘
In this work, we have synthesized tetrahexahedral (THH) Pt nanoparticles (NPs) enclosed with {730} high-index facets using a one-step square wave potential procedure. The catalytic activity of the THH NPs toward the oxygen reduction reaction (ORR) is studied under both transient and steady-state conditions. As a benchmark, the ORR activity is compared with those of polycrystalline Pt and a commercial Pt/C catalyst. The results show that, under transient conditions, the catalytic performance of the THH Pt NPs and Pt/C are approximately the same and about 2 times lower than that of polycrystalline Pt. However, under steady-state conditions the THH Pt NPs perform considerably better than Pt/C. Under steady-state conditions THH Pt NPs are even slightly more active than polycrystalline Pt.