清华大学Zhiqiang Niu研究团队的一项最新研究发现，类块状Pt(100)取向的超薄表面可结合单晶和纳米颗粒的优点，促进氧还原（ORR）反应。相关论文于2022年11月24日发表于国际顶尖学术期刊《德国应用化学》杂志上。

在该研究中，团队采用外延生长法制备了超薄Pt(100)合金面。通过现场-探针反应和不同的光谱分析表明，该表面具有3.1%-6.9%的压缩应变和块状特征。该表面ORR活性超过块体Pt₃Ni(100)和Pt(111)，比活性和质量活性分别比商用Pt/C提高了19倍和13倍。此外，该材料的电化学活性表面积（ECSA）比传统薄膜（如NSTF）增加了四倍，这使得催化剂在燃料电池运行的高电流密度下更能容忍电压损失。这项工作拓宽了扩展表面催化剂的家族，并强调了先进电催化剂开发中知识驱动的方法。

据了解，具有高度配位位点的单晶表面通常对氧还原反应和其他反应具有较高的比活性，然而将它们的高比活性转化为实用的高表面积电催化剂仍然具有挑战性。

附：英文原文

Title: Bulk-like Pt(100)-oriented Ultrathin Surface: Combining the Merits of Single Crystals and Nanoparticles to Boost Oxygen Reduction Reaction

Author: Shuyan Gong, Mingze Sun, Yi-Yang Lee, Nigel Becknell, Jiangwei Zhang, Zhongqi Wang, Liang Zhang, Zhiqiang Niu

Issue&Volume: 2022-11-24

Abstract: Single crystal surfaces with highly coordinated sites very often hold high specific activities toward oxygen reduction reaction (ORR) and others. Transposing their high specific activity to practical high-surface-area electrocatalysts remains challenging. Here, ultrathin Pt(100) alloy surface is constructed via epitaxial growth. The surface shows 3.16.9% compressive strain and bulk-like characteristics as demonstrated by site-probe reactions and different spectroscopies. Its ORR activity exceeds that of bulk Pt3Ni(100) and Pt(111) and presents a 19-fold increase in specific activity and a 13-fold increase in mass activity relative to commercial Pt/C. Moreover, the electrochemically active surface area (ECSA) is increased by 4-fold compared to traditional thin films (e.g. NSTF), which makes the catalyst more tolerant to voltage loss at high current densities under fuel cell operation. This work broadens the family of extended surface catalysts and highlights the knowledge-driven approach in the development of advanced electrocatalysts.

DOI: 10.1002/anie.202214516

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202214516