journal article·2021-09-22

Hydrogen Evolution/Oxidation Electrocatalysts by the Self-Activation of Amorphous Platinum

Zhonghua Ma, Chang Chen, Xiangzhi Cui, Liming Zeng, Lianjun Wang, Wan Jiang, Jianlin Shi

ACS Applied Materials & Interfaces· Volume 13· Issue 37
Publisher page

Abstract

Amorphous nanostructures usually exhibit special and intriguing catalytic activities, and the electrochemical performance can be tuned during operation. Herein, a facile approach of the self-activation of amorphous platinum (A-Pt) nanospheres has been applied to develop a durable and efficient hydrogen electrode catalyst toward both the hydrogen evolution reaction (HER) and the hydrogen oxidation reaction (HOR), which was in situ converted to crystalline counterparts and partially oxidized during the electrochemical cycling, leading to the self-activated enhancements of both HER and HOR activities with the decreased overpotential by 5 times and the increased hydrogen oxidation current density by 67%, respectively. Especially, in addition to 12 times higher mass activity compared to benchmark Pt/C, in situ-activated A-Pt also demonstrated a lower HER overpotential even after 20 000 cycles than Pt/C. The significantly improved catalytic performance benefits from the rapid self-reconstruction processes (crystallization and oxidation) of the amorphous Pt during electrochemical cycling. This work shows the intriguing properties of the amorphous nanostructure and provides a new idea for designing an efficient electrocatalyst by phase engineering.
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Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced Memory and Neural Computing · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China

School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, P. R. China

Institute of Rare Metals, Guangdong Academy of Science, Guangzhou 510070, P. R. China

College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China

Funding

Natural Science Foundation of Shanghai · Science and Technology Commission of Shanghai Municipality · State Key Laboratory of Advanced Technology for Materials Synthesis and Processing · State Key Laboratory for Modication of Chemical Fibers and Polymer Materials, Donghua University

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