Tuning of metallic valence in CoMoP for promoting electrocatalytic hydrogen evolution
| Autor: | Dongyu Liu, Mingtao Li, Shiyao Lu, Chunhui Xiao, Dan Li, Yuankun Wang, Shuang Zhao, Yaming Ma, Guangbo Chen, Guoqing Zhou |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Tafel equation
Valence (chemistry) Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology 02 engineering and technology Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Catalysis Metal Fuel Technology Adsorption Chemical physics visual_art Desorption visual_art.visual_art_medium 0210 nano-technology Current density |
| Zdroj: | International Journal of Hydrogen Energy. 44:31072-31081 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2019.10.016 |
| Popis: | CoMoPx-based electrocatalysts are promising for hydrogen evolution reaction (HER) but suffer from high overpotential and poor stability at large current density. Herein, we propose CoMoP@NF in lower valence states by thorough phosphorization which improves the adhesion of the catalysts on substrate and facilitates the Volmer step. The CoMoP@NF can reach 39 mV at 10 mA cm−2, 119 mV at 100 mA cm−2, and a low Tafel slope of 73.3 mV per decade. The decline of i-t test in 10 h at ~370 mA cm−2 is only 1 mA cm−2. Theoretical calculations confirm the rational design of CoMoP whose Δ G H ∗ is as low as 0.15 and −0.01 eV corresponding to (013) and (211) facets, respectively. Electrons transfer from Co to Mo results in middle d band center of CoMoP that promotes H adsorption and desorption. This concept could provide valuable insights into the design of other catalysts for HER and beyond. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect