Low-temperature Synthesis of Heterostructures of Transition Metal Dichalcogenide Alloys (WxMo1–xS2) and Graphene with Superior Catalytic Performance for Hydrogen Evolution
| Autor: | Bernd Kabius, Chanjing Zhou, Xuyang Wang, Oluwagbenga Oare Iyiola, Jose L. Mendoza-Cortes, Kazunori Fujisawa, Mauricio Terrones, Lakshmy Pulickal Rajukumar, Ruitao Lv, Morinobu Endo, Nestor Perea Lopez, Yu Lei, Ana Laura Elías, Nasim Alem, Srimanta Pakhira |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Tafel equation
Materials science Graphene Alloy General Engineering General Physics and Astronomy Nanotechnology Heterojunction 02 engineering and technology Thermal treatment engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis law.invention Transition metal Chemical engineering law engineering General Materials Science 0210 nano-technology Current density |
| Zdroj: | ACS Nano. 11:5103-5112 |
| ISSN: | 1936-086X 1936-0851 |
| DOI: | 10.1021/acsnano.7b02060 |
| Popis: | Large-area (∼cm2) films of vertical heterostructures formed by alternating graphene and transition-metal dichalcogenide (TMD) alloys are obtained by wet chemical routes followed by a thermal treatment at low temperature. In particular, we synthesized stacked graphene and WxMo1–xS2 alloy phases that were used as hydrogen evolution catalysts. We observed a Tafel slope of 38.7 mV dec–1 and 96 mV onset potential (at current density of 10 mA cm–2) when the heterostructure alloy was annealed at 300 °C. These results indicate that heterostructures formed by graphene and W0.4Mo0.6S2 alloys are far more efficient than WS2 and MoS2 by at least a factor of 2, and they are superior compared to other reported TMD systems. This strategy offers a cheap and low temperature synthesis alternative able to replace Pt in the hydrogen evolution reaction (HER). Furthermore, the catalytic activity of the alloy is stable over time, i.e., the catalytic activity does not experience a significant change even after 1000 cycles. Using... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|