A Combined experimental and theoretical study of the accelerated hydrogen evolution kinetics over wide pH range on porous transition metal doped tungsten phosphide electrocatalysts
| Autor: | Kuan Chang, Cheng Zhang, Chang-jun Liu, Jiajun Wang, Jingguang G. Chen, Ji Hoon Lee, Brian M. Tackett, Zeyu Sun |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Dopant Phosphide Process Chemistry and Technology chemistry.chemical_element 02 engineering and technology Tungsten 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences Catalysis 0104 chemical sciences Nanomaterials Metal chemistry.chemical_compound chemistry Chemical engineering Transition metal visual_art visual_art.visual_art_medium 0210 nano-technology General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 251:162-167 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2019.03.065 |
| Popis: | Modifying the nanostructures and chemical compositions provides an opportunity of developing the effective and inexpensive hydrogen evolution reaction (HER) electrocatalysts. Herein, porous transition metal doped tungsten phosphide (M-WP, M=Mo, Co) catalysts have been developed as enhanced HER electrocatalysts in comparison with pristine WP. Owing to the incorporated transition metals, the as-prepared M-WP nanomaterials exhibit porous nanostructures, abundant active sites and reduced charge transfer resistances. Density functional theory (DFT) calculations further demonstrate that the Co dopant simultaneously facilitates the water dissociation step and optimizes the hydrogen adsorption free energy during the entire HER process. Consequently, the Co-WP catalyst shows efficient and stable HER performance over wide pH range. This work demonstrates how metal dopants promote the HER kinetics and develops the strategy for further designing non-precious metal based nanomaterials for energy conversion and electrocatalysis. |
| Databáze: | OpenAIRE |
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