Cobalt based nanostructured alloys: Versatile high performance robust hydrogen evolution reaction electro-catalysts for electrolytic and photo-electrochemical water splitting |
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| Authors: | Prasad Prakash Patel Prashanth Jampani Hanumantha Moni Kanchan Datta Oleg I Velikokhatnyi Daeho Hong James A Poston Ayyakkannu Manivannan Prashant N Kumta |
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| Affiliation: | 1. Department of Chemical and Petroleum Engineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA;2. Department of Bioengineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA;3. Center for Complex Engineered Multifunctional Materials, University of Pittsburgh, PA 15261, USA;4. US Department of Energy, National Energy Technology Laboratory, Morgantown, WV 26507, USA;5. Mechanical Engineering and Materials Science, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA;6. School of Dental Medicine, University of Pittsburgh, PA 15217, USA |
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| Abstract: | 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. |
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| Keywords: | Hydrogen evolution reaction PEM water electrolysis Photoelectrochemical water splitting Iridium Cobalt Nanostructured solid solution |
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