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Rational design of multifunctional electrocatalyst: An approach towards efficient overall water splitting and rechargeable flexible solid-state zinc–air battery

Lookup NU author(s): Dr Ramakrishnan ShanmugamORCiD

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Abstract

Constructing an electrocatalyst with highly durable active and cost-effective core-shell with a porous carbon nanosheet for the development of high efficiency energy conversion and storage devices. Herein, we developed core-shell nickel-iron oxide on a highly porous N-doped carbon nanosheet (CS-NFO@PNC) via a facile solvothermal calcination route. The optimized CS-NFO@PNC-700 showed remarkable electrocatalytic activity towards ORR (0.85 V vs RHE), OER ƞ₁₀ = 217 mV, and HER ƞ₁₀ = 200 mV with excellent durability towards the corresponding half-cell reactions. Further, we investigated the ORR, OER, and HER mechanistic pathways of the electrocatalyst using the density functional theory. Finally, we fabricated a rechargeable liquid electrolyte-based zinc–air battery with CS-NFO@PNC-700 as the cathode which displayed an improved power density of 130 mW cm⁻² at 217 mA cm⁻² with excellent durability of 180 h. The rechargeable flexible quasi-solid-state zinc–air battery with CS-NFO@PNC-700 air cathode, which exhibited excellent long term durability over 40 h at 5 mA cm⁻².

Publication metadata

Author(s): Ramakrishnan S, Velusamy DB, Sengodan S, Nagaraju G, Kim AR, Kim DH, Yoo DJ

Publication type: Article

Publication status: Published

Journal: Applied Catalysis B: Environmental

Year: 2022

Volume: 300

Print publication date: 01/01/2022

Online publication date: 28/09/2021

Acceptance date: 23/09/2021

ISSN (print): 0926-3373

ISSN (electronic): 1873-3883

Publisher: Elsevier BV

URL: https://doi.org/10.1016/j.apcatb.2021.120752

DOI: 10.1016/j.apcatb.2021.120752

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