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Shape-tuned, surface-active and support-free silver oxygen reduction electrocatalyst enabled high performance fully non-PGM alkaline fuel cell

Anandha Ganesh, P and Prakrthi, AN and Selva Chandrasekaran, S and Jeyakumar, D (2021) Shape-tuned, surface-active and support-free silver oxygen reduction electrocatalyst enabled high performance fully non-PGM alkaline fuel cell. In: RSC Advances, 11 (40). pp. 24872-24882.

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Official URL: https://doi.org/10.1039/d1ra02718b


Exploring non-platinum group metal (n-PGM) based efficient oxygen reduction reaction (ORR) electro-catalysts is highly important for realizing advancement in sustainable next generation-alkaline anion exchange membrane fuel cells (AAEMFCs). Herein, we demonstrate a new �hierarchical shape tuning approach� for the synthesis of controlled sized and shaped non-PGM based Ag ORR electro-catalysts with surface active nano-islands. Hierarchical shapes ranging from spherical (S-AgNs), worm-in-sphere, sphere-in-worm and vermiform (worm-like) Ag nanostructures (V-AgNs) were obtained by precisely varying the ratios of capping agent to dual reducing agents in water at ambient conditions. Compared to S-AgNs, V-AgNs revealed a higher mass normalized ORR Tafel activity (0.303 A mgAg�1at 0.9 V), onset (1.06 V) and half wave (0.78 V) potentials and higher retention of limiting current density (>88) after 5000 cycles in 0.5 M potassium hydroxide (KOH) solution attributable to their unique worm like morphology with surface active nano-islands and support free-nature enabled better catalyst utilization. In a fully �non-PGM AAEMFC� (n-PAAEMFC), V-AgNs exhibited the highest fuel cell activity of 115.6 mW cm�2and stable short-term durability (�240 h) compared to S-AgNs (41.3 mW cm�2) and previously reported fully n-PAAEMFCs indicating their potential use in next-generation alkaline fuel cells. © The Royal Society of Chemistry 2021.

Item Type: Journal Article
Publication: RSC Advances
Publisher: Royal Society of Chemistry
Additional Information: The copyright for this article belongs to Authors
Keywords: Electrocatalysts; Electrolysis; Electrolytic reduction; Ion exchange membranes; Morphology; Oxygen; Oxygen reduction reaction; Potassium hydroxide; Reducing agents; Silver; Spheres, Alkaline anion exchange membrane; Ambient conditions; Catalyst utilization; Limiting current density; Oxygen Reduction; Potassium hydroxide solution; Short-term durabilities; Surface active, Alkaline fuel cells
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 20 Nov 2021 11:35
Last Modified: 20 Nov 2021 11:35
URI: http://eprints.iisc.ac.in/id/eprint/69895

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