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Saha S, Mitra S, Kharwar YP, Annadata HV, Roy S, Dutta A. A Molecular Catalyst-Driven Sustainable Zinc-Air Battery Assembly. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2025; 21:e2411021. [PMID: 39639183 DOI: 10.1002/smll.202411021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2024] [Indexed: 12/07/2024]
Abstract
Bidirectional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts are key for molecular oxygen-centric renewable energy transduction via metal-air batteries. Here, a molecular cobalt complex is covalently tethered on a strategically functionalized silica surface that displayed both ORR and OER in alkaline media. The detailed X-ray absorbance spectroscopy (XAS) studies indicate that this catalyst retains its intrinsic molecular features while playing a central role during bidirectional electrocatalysis and demonstrating a relatively lower energy gap between O2/H2O interconversions. This robust molecular catalyst-silica composite (deposited on a porous carbon paper) is assembled along with a zinc foil and polymeric gel membrane to devise an active single-stack quasi-solid zinc-air battery (ZAB) setup. This quasi-solid ZAB assembly displayed impressive power density (60 mW cm-2@100 mA cm-2), specific capacity (818 mAh g-1@ 5mA cm-2), energy density (757 Whkg-1 @5mA cm-2), and elongated charging/discharging life (28 h). An appropriate assembly of these ZAB units is able to power practical electronic appliances, requiring ≈1.6-6.0V potential requirements.
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Affiliation(s)
- Sukanta Saha
- Chemistry Department, Indian Institute of Technology Bombay, Mumbai, Maharashtra, 400076, India
| | - Sampurna Mitra
- Chemistry Department, Indian Institute of Technology Bombay, Mumbai, Maharashtra, 400076, India
| | - Yashwant Pratap Kharwar
- Chemistry Department, Indian Institute of Technology Bombay, Mumbai, Maharashtra, 400076, India
| | - Harshini V Annadata
- Beamline Development & Application Section, Bhabha Atomic Research Center, Trombay, Mumbai, 400085, India
| | - Soumyabrata Roy
- Department of Materials Science and Nano Engineering, Rice University, Houston, TX, 77005, USA
| | - Arnab Dutta
- Chemistry Department, Indian Institute of Technology Bombay, Mumbai, Maharashtra, 400076, India
- Interdisciplinary Program Climate Studies, Indian Institute of Technology Bombay, Mumbai, Maharashtra, 400076, India
- National Centre of Excellence in Carbon Capture and Utilization, Mumbai, Maharashtra, 400076, India
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Saini A, Das C, Guha A, Majumder P, Dutta A. Harnessing the cobalt complex for bidirectional O 2/H 2O transformation in neutral water via electrocatalysis/photocatalysis. STAR Protoc 2024; 5:103015. [PMID: 38613776 PMCID: PMC11026828 DOI: 10.1016/j.xpro.2024.103015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 02/26/2024] [Accepted: 03/26/2024] [Indexed: 04/15/2024] Open
Abstract
Bidirectional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalysts are crucial for renewable energy transduction via electrolyzers and fuel cell. Here, we present a protocol for harnessing the cobalt complex for bidirectional O2/H2O transformation in neutral water via electrocatalysis/photocatalysis. We describe steps for monitoring ORR and OER in neutral aqueous solution, measuring O2 concentration, and identifying the probable catalytic mechanism for ORR and OER. We then detail procedures for examining catalyst behavior under photocatalytic conditions in neutral aqueous surroundings. For complete details on the use and execution of this protocol, please refer to Saini et al.1.
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Affiliation(s)
- Abhishek Saini
- Chemistry Department, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Chandan Das
- Chemistry Department, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Aritra Guha
- Chemistry Department, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Piyali Majumder
- Chemistry Department, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Arnab Dutta
- Chemistry Department, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India; Interdisciplinary Program in Climate Studies, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India; National Center of Excellence in CCU, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
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