Bae Dongyeon, Park Karam, Kwon Hagyeong, Won Dongyeun, Ling Ning, Baik Hionsuck, Yang Jayoon, Park Hee Jung, Cho Jiung, Yang Heejun, Jeong Sukmin, Cho Suyeon
Division of Chemical Engineering and Materials Science, ELTEC College of Engineering, Ewha Womans University, Seoul 03760, Republic of Korea.
System Health & Engineering Major in Graduate School (BK21 Plus Program), Ewha Womans University, Seoul 03760, Republic of Korea.
ACS Appl Mater Interfaces. 2021 Jan 20;13(2):2437-2446. doi: 10.1021/acsami.0c16098. Epub 2020 Dec 22.
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 PtTe, 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/cm. PtTe was synthesized as nanocrystals on a metallic molybdenum ditelluride (MoTe) template by a rapid electrochemical method. X-ray diffraction and high-resolution transmission microscopy revealed that the PtTe nanocrystals have a unique layered structure with repeated monolayer units of PtTe and PtTe. Theoretical calculations exhibit that PtTe 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.
二维（2D）层状催化剂因其具有丰富的活性位点且氢吸附的吉布斯自由能变化几乎为零，被认为是一类用于析氢反应（HER）的理想催化剂。尽管性能前景广阔，但基于二维材料设计稳定且经济的电化学催化剂仍有待解决，以实现工业规模的制氢。在此，我们报道了层状碲化铂矿物米特洛凡诺夫矿（PtTe），它是一种高效且稳定的HER催化剂，过电位为39.6 mV，塔菲尔斜率为32.7 mV/dec，同时具有超过7000 mA/cm²的高电流密度。通过快速电化学方法在金属二碲化钼（MoTe）模板上合成了纳米晶体形式的PtTe。X射线衍射和高分辨率透射显微镜显示，PtTe纳米晶体具有独特的层状结构，由PtTe和PtTe的重复单层单元组成。理论计算表明，具有大量边缘的PtTe的氢吸附吉布斯自由能变化接近零，这表明其具有优异的HER性能以及用于大规模制氢的极大交换电流密度。
