posted on 2021-06-01, 19:07authored byYonggang Feng, Zhonglong Zhao, Fan Li, Lingzheng Bu, Qi Shao, Leigang Li, Jianbo Wu, Xing Zhu, Gang Lu, Xiaoqing Huang
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.