【作者】 王成名； 马亮； 廖玲文； 柏嵩； 龙冉； 左鸣； 熊宇杰；

【Author】 Chengming Wang;Ma;Liao;Bai;Long;Zuo;Xiong;Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China;School of Chemistry and Materials Science, University of Science and Technology of China;

【机构】 中国科学技术大学合肥微尺度物质科学国家实验室； 中国科学技术大学化学与材料科学学院；

【摘要】 获得在燃料电池氧还原反应中铂电催化剂的高活性和高稳定性仍然是个重大挑战。我们开发出了一类具有高度凹面立方体(HCC)结构的铂纳米晶催化剂,具有{311}等高指数晶面和高氧还原活性。HCC纳米晶的稳定性可通过和石墨烯的组装得到显著提高。该独特的复合结构表现出进一步增强的电化学活性,比商用的Pt/C催化剂活性高出7倍。这种复合结构也在半波电位(E1/2)方面表现出了突出的高性能。在较低Pt担载量为46μg/cm2时,这种催化剂的半波电位高达0.967 V,比商用Pt/C催化剂高出63 mV,而且还稍高于文献中活性最高的多孔Pt-Ni催化剂的记录。本工作为通过调节负载基质的表面和界面来设计高性能电催化剂铺平了道路。更多还原

【Abstract】 It remains a grand challenge to achieve both high activity and durability in Pt electrocatalysts for oxygen reduction reaction(ORR) in fuel cells. Here we develop a class of Pt highly concave cubic(HCC) nanocrystals, which are enriched with high-index facets and exhibit high ORR activity. The durability of HCC nanocrystals can be significantly improved via assembly with graphene. The unique hybrid structure displays further enhanced specific activity, which is 7-fold greater than the state-of-the-art Pt/C catalysts. Strikingly, it exhibits impressive performance in terms of half-wave potential(E1/2). The E1/2 of 0.967 V at the Pt loading as low as 46 μg cm-2, which stands as 63 mV higher than that of the Pt/C catalysts, is slightly superior to the record observed for the most active porous Pt-Ni catalyst in literature. This work paves the way to designing high-performance electrocatalysts by modulating their surface and interface with loading substrates.更多还原