Cobalt based nanostructured alloys: Versatile high performance robust hydrogen evolution reaction electro-catalysts for electrolytic and photo-electrochemical water splitting
| Autor: | James A. Poston, Ayyakkannu Manivannan, Prashanth Jampani Hanumantha, Oleg I. Velikokhatnyi, Moni Kanchan Datta, Daeho Hong, Prasad Prakash Patel, Prashant N. Kumta |
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| Rok vydání: | 2017 |
| Předmět: |
Hydrogen
Renewable Energy Sustainability and the Environment Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Electrolyte engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis Fuel Technology chemistry engineering Water splitting Noble metal 0210 nano-technology Cobalt Solid solution |
| Zdroj: | International Journal of Hydrogen Energy. 42:17049-17062 |
| ISSN: | 0360-3199 |
| Popis: | Engineering reduced noble metal containing electro-catalysts exhibiting superior electrochemical performance is important for efficient and economic production of hydrogen from electrolytic and photoelectrochemical (PEC) water splitting reactions. In this study, nanostructured Co–Ir solid solution alloys, Co1−x(Irx) (x = 0.2, 0.3, 0.4) have been studied as electro-catalysts for hydrogen evolution reaction (HER). Co1−x(Irx) (x = 0.3, 0.4) exhibit similar onset over-potential to Pt/C and lower over-potential required for Co1−x(Irx) (x = 0.3, 0.4) than Pt/C in acidic, neutral as well as basic media, suggesting excellent electrochemical activity of Co–Ir alloys, further studied using theoretical first principles density functional theory calculations. Co1−x(Irx) exhibit excellent electrochemical stability in acidic media similar to that of Pt/C. The applied bias photon-to-current efficiency obtained using Co1−x(Irx) (x = 0.3, 0.4) electro-catalysts and (Sn0.95Nb0.05)O2:N-600 NTs as photoanode in H-type cell is ∼5.74% and ∼7.92%, respectively which is ∼40% and ∼93% higher than Pt/C (∼4.1%) indicating considerable promise of the system. |
| Databáze: | OpenAIRE |
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