Enhanced Electrocatalytic Hydrogen Evolution from Large-Scale, Facile-Prepared, Highly Crystalline WTe2 Nanoribbons with Weyl Semimetallic Phase

• DOI: 10.1021/acsami.7b13387
• Publication Date: 2017-12-13T15:46:16Z
• Authors: Jie Li; Meiling Hong; Leijie Sun; Wenfeng Zhang; Haibo Shu; Haixin Chang
• Keywords: Weyl semimetal; Overpotential

Tungsten ditellurium (WTe2) is one of most important layered transition metal dichalcogenides (TMDs) and exhibits various prominent physical properties. All the present methods for WTe2 preparation need strict conditions such as high temperature or cannot be applied in large scale, which limits its practical applications. In addition, studies on focus properties, whereas electrochemical properties are still illusive with little investigation. Here, we develop a facile scalable two-step method to synthesize high-quality nanoribbon crystals 1T' Weyl semimetal phase first time. Highly crystalline 1T'-WTe2 nanoribbons can obtained scale through this method. tests show that exhibit smaller overpotential much better hydrogen evolution reaction catalytic performance than other tungsten-based sulfide selenide (WS2, WSe2) same morphology under conditions. Tafel slope 57 mV/dec, best values TMD catalysts about 2 4 times 2H-WS2 (135 mV/dec) 2H-WSe2 (213 mV/dec), respectively. also ultrahigh stability 5000 cycles 20 h at 10 mA/cm2. The attributed conductivity semimetallic 1T'-phase-stable two order higher charge-transfer rate normally semiconducting 2H-stable WS2 WSe2 nanoribbons. These results open door applications TMDs.