Boosting catalytic activity of niobium/tantalum-nitrogen active-sites for triiodide reduction in photovoltaics
| Autor: | Menglong Sun, Xi Wang, Yinhao Wang, Zhuolei Liu, Yongwei Zhang, Sining Yun, Lishan Zhang, Jiaoe Dang |
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| Rok vydání: | 2021 |
| Předmět: |
Tafel equation
Materials science Ion exchange Inorganic chemistry Energy conversion efficiency Tantalum chemistry.chemical_element 02 engineering and technology Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry chemistry Triiodide 0210 nano-technology |
| Zdroj: | Journal of Colloid and Interface Science. 603:651-665 |
| ISSN: | 0021-9797 |
| Popis: | To fabricate high-quality catalysts with abundant active sites, a series of transition-metal-modified nitrogenous carbon catalysts (Ta-NOC, Nb-NOC, and Nb/Ta-NOC) was successfully fabricated via pyrolysis and ion exchange. Owing to the high conductivity and ion transport capacity of its unique nitrogen-carbon structure, and synergistic effect of dual-metal active sites on modulating electronic structure, Nb/Ta-NOC catalyst exhibited an excellent catalytic performance and a remarkable electrochemical stability in triiodide reduction reaction (IRR) and hydrogen evolution reaction (HER). Nb/Ta-NOC catalyst achieved an ideal conversion efficiency of 8.45% for IRR in solar cells, which was higher than that of Pt electrode (7.63%). Furthermore, Nb/Ta-NOC catalyst exhibited a small overpotential of 145 mV at a current density of 10 mA·cm-2 and a Tafel slope of 77 mV dec-1 for HER. This work provided a new approach for the rational design of the active-sites-rich electrocatalysts for energy conversion applications. |
| Databáze: | OpenAIRE |
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