Roy, B and Shebin, KJ and Sampath, S (2020) Pyrite-type cobalt phosphosulphide bifunctional catalyst for aqueous and gel-based rechargeable zinc-air batteries. In: Journal of Power Sources, 450 .
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Abstract
Bifunctional electrocatalysts with favorable electrode kinetics towards oxygen reduction and oxygen evolution reactions are the main pre-requisites to achieve practical utility of metal-air systems. Herein, ternary pyrite type nanosized cobalt phosphosulphide is reported as an excellent oxygen reduction/oxygen evolution catalyst in alkaline medium with a favorable reversible oxygen electrode index (difference between E10mA for oxygen evolution and E3mA for oxygen reduction) of 0.69 V. Four-electron reduction with low overpotential of ~240 mV to observe a current density of 10 mA cm−2 is reported. The assembled zinc-air batteries with both aqueous liquid- and gel-based electrolytes display stable low charge-discharge voltage polarization over a long duration. Aqueous primary zinc-air battery exhibits an impressive peak power density of 385 mW cm−2 at 560 mA cm−2 and a current density of 220 mA cm−2 at 1.0 V. The zinc-air battery in the air-breathing, rechargeable mode operates for over 100 h at 10 mA cm−2 and over a few hundred cycles under a drain current of 50 mAcm−2. The rechargeable battery has been investigated for both long term (4 h) and short term (10 min) cycles under different drain currents (10, 20 and 50 mA cm−2). Round trip efficiencies of ~64% have been achieved. Use of CoPS electrodes with gel-based electrolytes has also been demonstrated. The primary gel battery displays a specific capacity of 803 mA cm−2 corresponding to an energy density of 891 Wh kg−1. The high efficiency and durability of the catalyst establish its feasibility as a cost-effective alternative to precious metal catalysts. © 2019 Elsevier B.V.
| Item Type: | Journal Article |
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| Publication: | Journal of Power Sources |
| Publisher: | Elsevier B.V. |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Cobalt compounds; Cost effectiveness; Drain current; Electric discharges; Electrocatalysts; Electrodes; Electrolytic reduction; Oxygen; Phosphorus compounds; Pyrites; Solid electrolytes; Sulfur compounds; Zinc, Bi-functional catalysts; Bifunctional electrocatalysts; Four-electron reduction; Gel electrolyte; Oxygen evolution reaction; Oxygen reduction reaction; Precious metal catalysts; Rechargeable zinc-air batteries, Zinc air batteries |
| Department/Centre: | Division of Chemical Sciences > Inorganic & Physical Chemistry |
| Date Deposited: | 24 Jan 2023 11:22 |
| Last Modified: | 24 Jan 2023 11:22 |
| URI: | https://eprints.iisc.ac.in/id/eprint/79434 |
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