| Authors: | Patel, Prasad Prakash; Velikokhatnyi, Oleg I.; Ghadge, Shrinath D.; Hanumantha, Prashanth J.; Datta, Moni Kanchan; Kuruba, Ramalinga; Gattu, Bharat; Shanthi, Pavithra Murugavel; Kumta, Prashant N. |
| Title: | Electrochemically active and robust cobalt doped copper phosphosulfide electro-catalysts for hydrogen evolution reaction in electrolytic and photoelectrochemical water splitting |
| Type: | Journal Article |
| Publisher: | International Journal of Hydrogen Energy
|
| Year: | 2018 |
| Volume: | 43 |
| Issue: | 16 |
| Start Page: | 7855-7871 |
| End Page: | |
| DOI: | 10.1016/j.ijhydene.2018.02.147 |
| WEB-link: | http://www.sciencedirect.com/science/article/pii/S0360319918306505 |
| Abstract: | The area of non-noble metals based electro-catalysts with electrochemical activity and stability similar or superior to that of noble metal electro-catalyst for efficient hydrogen production from electrolytic and photoelectrochemical (PEC) water splitting is a subject of intense research. In the current study, exploiting theoretical first principles study involving determination of hydrogen binding energy to the surface of the electro-catalyst, we have identified the (Cu0.83Co0.17)3P: x at. % S system displaying excellent electrochemical activity for hydrogen evolution reaction (HER). Accordingly, we have experimentally synthesized (Cu0.83Co0.17)3P: x at. % S (xý=ý10, 20, 30) demonstrating excellent electrochemical activity with an onset overpotential for HER similar to Pt/C in acidic, neutral as well as basic media. The highest electrochemical activity is exhibited by (Cu0.83Co0.17)3P:30ýat. % S nanoparticles (NPs) displaying overpotential to reach 100ýmAýcm2 in acidic, neutral and basic media similar to Pt/C. The (Cu0.83Co0.17)3P:30ýat. % S NPs also display excellent electrochemical stability in acidic media for long term electrolytic and PEC water splitting process [using our previously reported (Sn0.95Nb0.05) O2: N-600 nanotubes (NTs) as the photoanode]. The applied bias photon-to-current efficiency obtained using (Cu0.83Co0.17)3P:30ýat. % S NPs as the cathode electro-catalyst for HER in an H-type PEC water splitting cell (<4%) is similar to that obtained using Pt/C (<4.1%) attesting to the promise of this exciting non-noble metal containing system.
|
| Keywords: | Hydrogen evolution reaction |
| File: | (3229K) |
