Bimetallic NiO/NiFe2O4 heterostructures with interfacial effects for boosting electrochemical water splitting applications

Sebastian Cyril Jesudass, Subramani Surendran, Joon Young Kim, Sathyanarayanan Shanmugapriya, Dae Jun Moon, Gnanaprakasam Janani, Krishnan Veeramani, Shivraj Mahadik, Jinuk Choi, Pildo Jung, Il Goo Kim, Hyunjung Park, Hyun Soo Han, Heechae Choi, Gibum Kwon, Jaeyeong Heo, Kootak Hong, Tae Hoon Kim*, Yong Il Park, Uk Sim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The present work reports the simple preparation of NiO/ NiFe2O4 heterostructures with interfacial effects as bifunctional electrocatalysts for overall water splitting. At increasing Ni/Fe precursor ratios, the evolution of NiO phases is observed in NFO heterostructures, which incorporate differential strain effects at the interface. The modulated heterojunction of NiO/NiFe2O4 heterostructure incorporates compressive strain at the interfaces enhancing its electrocatalytic performances. Notably, NiO/NiFe2O4 heterostructure prepared at equimolar Ni/Fe ratios (NFO-1) exhibits significant electrocatalytic performances due to modulated interfacial effects. As such, NFO-1 exhibits lower OER and HER overpotentials of about 242 mV and 106 mV for 10 mA cm−2 current density and exhibits improved water splitting activity, requiring 1.56 V to drive 10 mA cm−2 current density. The present work emphasizes the importance of modulating the heterostructures of transition metal oxides to enhance the interfacial effects as bifunctional electrocatalysts for water splitting applications.

Original languageEnglish
Article number117947
JournalJournal of Electroanalytical Chemistry
Volume952
DOIs
Publication statusPublished - 1 Jan 2024

Keywords

  • Energy conversion
  • Heterogenous electrocatalysts
  • Heterostructures
  • Hydrogen production
  • Transition metal oxide
  • Water splitting

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