| Autor: |
Ede SR; Academy of Scientific and Innovative Research, CSIR-Central Electrochemical Research Institute (CECRI), New Delhi, India.; Materials Electrochemistry Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India., Bijoy TK; Academy of Scientific and Innovative Research, CSIR-Central Electrochemical Research Institute (CECRI), New Delhi, India.; Materials Electrochemistry Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India., Sankar SS; Academy of Scientific and Innovative Research, CSIR-Central Electrochemical Research Institute (CECRI), New Delhi, India.; Materials Electrochemistry Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India., Murugan P; Academy of Scientific and Innovative Research, CSIR-Central Electrochemical Research Institute (CECRI), New Delhi, India.; Materials Electrochemistry Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India., Kundu S; Academy of Scientific and Innovative Research, CSIR-Central Electrochemical Research Institute (CECRI), New Delhi, India.; Materials Electrochemistry Division, CSIR-Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India. |
| Abstrakt: |
The production of hydrogen from ecofriendly renewable technologies like water electrolysis and fuel cells involves oxygen evolution reaction (OER), which plays a major role, but the slow kinetics of OER is a bottleneck of commercialization of such technologies. Herein, we have reported the formation of an efficient OER catalyst from SnCo(OH) 6 (SCH) by leaching of Sn atoms during electrochemical OER studies. According to density functional theory calculations, adsorption of OH* species on Sn atoms is energetically more favorable than that of Co atoms, and as a result, highly active CoOOH is generated by leaching of Sn atoms from surface layers. We observed enhanced OER performance with superior mass activity by blending SCH with activated charcoal, which displays a low overpotential of 293 mV and higher mass activity than that of pristine SCH. More importantly, it outperforms Co(OH) 2 and RuO 2 having the same carbon composition because of the formation of thermodynamically stable and amorphous CoOOH on the surface of single-crystalline SCH and strong tethering ability of activated charcoal. |
