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An efficient and durable trifunctional electrocatalyst for zinc–air batteries driven overall water splitting

Lookup NU author(s): Dr Ramakrishnan ShanmugamORCiD

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Abstract

Constructing more active and durable trifunctional electrocatalysts is key for boosting overall water splitting and metal–air battery efficiency. Herein, we developed a trifunctional electrocatalyst of ultrafine Pt nanoparticles anchored on CoS₂-N-doped reduced graphene oxide (Pt@CoS₂-NrGO). Owing to its more Pt active sites with rapid ion/electron transport ability, the Pt@CoS₂-NrGO shows excellent trifunctional activities towards HER (ƞ₁₀ = 39 mV), OER (ƞ₁₀ = 235 mV) ORR (E_1/2 = 0.85 V vs. RHE) and water splitting device of Pt@CoS₂-NrGO||Pt@CoS₂-NrGO achieved cell voltage of 1.48 V at 10 mA cm⁻², which is better than Pt-C||RuO₂. Finally, we employed Pt@CoS₂-NrGO as air cathode for zinc–air battery to display a power density of 114 mW cm^-2 and durability of 55 h, outperforming than Pt-C + RuO₂ based zinc–air batteries. For practical aspects, Pt@CoS₂-NrGO based zinc–air batteries were connected to overall water splitting device to produce H₂ and O₂ gases for hydrogen fuel cell.

Publication metadata

Author(s): N Logeshwaran, Ramakrishnan S, SS Chandrasekaran, M Vinothkannan, AR Kim, S Sengodan, DB Velusamy, P Varadhan, JH He, DJ Yoo

Publication type: Article

Publication status: Published

Journal: Applied Catalysis B: Environmental

Year: 2021

Volume: 297

Print publication date: 15/11/2021

Acceptance date: 28/01/2020

ISSN (electronic): 0926-3373

Publisher: Elsevier

URL: https://doi.org/10.1016/j.apcatb.2021.120405

DOI: 10.1016/j.apcatb.2021.120405

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