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

Shanmugam Ramakrishnan, Dhinesh Babu Velusamy, Sivaprakash Sengodan, Goli Nagaraju, Do Hwan Kim, Ae Rhan Kim, Dong Jin Yoo

Research output: Contribution to journalArticlepeer-review

144 Scopus citations

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.

Original languageBritish English
Article number120752
JournalApplied Catalysis B: Environmental
Volume300
DOIs
StatePublished - Jan 2022

Keywords

  • Density functional theory
  • Multifunctional electrocatalyst
  • Nickel-iron oxide
  • Overall water splitting
  • Zinc–air batteries

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