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

By S. Ramakrishnan, D. B. Velusamy, Sivaprakash Sengodan, G. Nagaraju, Do Hwan Kim, A. Kim, D. Yoo. Applied Catalysis B: Environmental, 2022

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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.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/876d64620c04afa435f806e453b0bb63a304c121