Ruthenium Engineered A2B2O6-Hybrid Columbite Ferrite for Bifunctional pH-Universal Water Splitting

Patrick M. Bacirhonde, Ahmed Yousef Mohamed, Byounggun Han, Deok Yong Cho, Shrestha Devendra, Jong Won Choi, Che Ryong Lim, Emmanuel O. Afranie, Kyeong Ho Baik, Kyoungin Kang, Sunny Lee, Eun Suk Jeong, Nikhil Komalla, Nelson Y. Dzade, Chan Hee Park, Cheol Sang Kim

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Single-atomic catalysts based on ruthenium have a balanced efficiency for water splitting, but it is necessary to control their activity and durability. In this work, a binder-free Fe2-xRuxNb2O6 (FRNO) hybrid catalyst is rationally designed through a facile hydrogel-crosslinking route. The as-prepared FRNO catalyst exhibits high electrocatalytic activity and stability when operating under acidic (0.5 m H2SO4) and alkaline (1 m KOH) media. Operando X-ray adsorption and density functional theory calculations show that FRNO/CC, with its high intrinsic conductivity, promotes the adsorption and dissociation of water on its surface by regulating the charge distribution via charge transfer to the coordinated surface oxygen. This facilitates the oxygen evolution reaction (OER) performance by stabilizing *OOH adsorption on Ru and Fe. The FRNO/carbon cloth (CC) hybrid catalyst also delivers excellent activity and stability for both hydrogen evolution reaction (HER) and OER in pH-universal electrolytes with low overpotentials of 30 mV per 82 mV for HER and 200 mV per 260 mV for OER at a current density of 10 mA cm-2 in acidic/basic medium. Ultimately, the FRNO/CC hybrid catalyst shows good water-splitting performance, and it is expected to help contribute to the creation of various hybrid electrocatalysts.

Original languageEnglish (US)
Article number2300174
JournalAdvanced Energy Materials
Volume13
Issue number23
DOIs
StatePublished - Jun 16 2023

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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