Highly Surface-Distorted Pt Superstructures for Multifunctional Electrocatalysis
Highly Surface-Distorted Pt Superstructures for Multifunctional Electrocatalysis
复制标题
用于多功能电催化的高度表面扭曲的 Pt 超结构
DOI：
10.1021/acs.nanolett.1c00902
复制
发表时间：
2021-06-01
期刊：
影响因子：
10.8
通讯作者：
Huang, Xiaoqing
中科院分区：
文献类型：
--
作者：
Feng, Yonggang;Zhao, Zhonglong;Huang, Xiaoqing
铂（Pt）催化剂在能量转换和储存过程中起着关键作用，但实现进一步的性能增强仍然具有挑战性。在此，我们报告了一类新的Pt超结构（SS）的表面变形工程的PtTex SS的电化学浸出，可以大大提高氧还原反应（ORR），甲醇氧化反应（莫尔），和析氢反应（HER）。特别地，高畸变（H）-Pt SS在0.90 VRHE下实现ORR的2.24 A mg（-1）的质量活度和莫尔的2.89 A mg（-1）的质量活度，以及在10 mA cm（-2）下HER的25.3 mV的低过电位。可以通过减轻长时间电催化过程中的附聚/降解的有害影响来保持Pt SS的扭曲的表面特征。多尺度建模表明，表面压缩、缺陷和纳米孔协同作用，以提高ORR性能。这项工作突出了稳定的超结构和变形工程实现高性能的Pt纳米结构的进展。
Platinum (Pt) catalysts play a key role in energy conversion and storage processes, but the realization of further performance enhancement remains challenging. Herein, we report a new class of Pt superstructures (SSs) with surface distortion engineering by electrochemical leaching of PtTex SSs that can largely boost the oxygen reduction reaction (ORR), the methanol oxidation reaction (MOR), and the hydrogen evolution reaction (HER). In particular, the high-distortion (H)-Pt SSs achieve a mass activity of 2.24 A mg(-1) at 0.90 VRHE for the ORR and 2.89 A mg(-1) for the MOR as well as a low overpotential of 25.3 mV at 10 mA cm(-2) for the HER. Moreover, the distorted surface features of Pt SSs can be preserved by mitigating the detrimental effects of agglomeration/degradation during long-time electrocatalysis. A multiscale modeling demonstrates that surface compressions, defects, and nanopores act in synergy for the enhanced ORR performance. This work highlights the advances of stable superstructure and distortion engineering for realizing high-performance Pt nanostructures.