Mitrofanovite, Layered Platinum Telluride, for Active Hydrogen Evolution
- 주제(키워드) edges and defects , electrochemical deposition , hydrogen evolution reaction , mitrofavonite Pt3Te4 , platinum-tellurium compound
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 American Chemical Society
- 발행년도 2021
- URI http://www.dcollection.net/handler/ewha/000000175543
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/acsami.0c16098
- 저작권 이화여자대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Two-dimensional (2D) layered catalysts have been considered as a class of ideal catalysts for hydrogen evolution reaction (HER) because of their abundant active sites with almost zero Gibbs energy change for hydrogen adsorption. Despite the promising performance, the design of stable and economic electrochemical catalyst based on 2D materials remains to be resolved for industrial-scale hydrogen production. Here, we report layered platinum tellurides, mitrofanovite Pt3Te4, which serves as an efficient and stable catalyst for HER with an overpotential of 39.6 mV and a Tafel slope of 32.7 mV/dec together with a high current density exceeding 7000 mA/cm2. Pt3Te4 was synthesized as nanocrystals on a metallic molybdenum ditelluride (MoTe2) template by a rapid electrochemical method. X-ray diffraction and high-resolution transmission microscopy revealed that the Pt3Te4 nanocrystals have a unique layered structure with repeated monolayer units of PtTe and PtTe2. Theoretical calculations exhibit that Pt3Te4 with numerous edges shows near-zero Gibbs free-energy change of hydrogen adsorption, which shows the excellent HER performance as well as the extremely large exchange current density for massive hydrogen production. ©
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