Density Functional Theory Approximations and Experimental Investigations on Co1-xMoxTe2 Alloy Electrocatalysts Tuning the Overall Water Splitting Reactions

Dhanasekaran Vikraman, Sajjad Hussain, Zeesham Abbas, K. Karuppasamy, P. Santhoshkumar, Jongwan Jung, Hyun Seok Kim

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Understanding the relationship between electronic structure, surface characteristic, and reaction process of a catalyst helps to architect proficient electrodes for sustainable energy development. The highly active and stable catalysts made of earth-abundant materials provide a great endeavor toward green hydrogen production. Herein, we assembled the Co1-xMoxTe (x = 0-1) nanoarray structures into a bifunctional electrocatalyst to achieve high-performance hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) kinetics under alkaline conditions. The designed Co0.75Mo0.25Te and Co0.50Mo0.50 electrocatalysts require minimum overpotential and Tafel slope for high-efficacy HER and OER, respectively. Furthermore, we constructed a Co0.50Mo0.50Te2∥Co0.50Mo0.50Te2 device for overall water splitting with an overpotential of 1.39 V to achieve a current density of 10 mA cm-2, which is superior to noble electrocatalyst performance, with stable reaction throughout the 50 h continuous process. Density functional theory approximations and Gibbs free energy calculations validate the enhanced water splitting reaction catalyzed by the Co0.50Mo0.50Te2 nanoarrays. The partial replacement of Co atoms with Mo atoms in the Co0.50Mo0.50Te2 structure substantially enhances the water electrolysis kinetics through the synergistic effects between the combined metal atoms and the bonded chalcogen.

Original languageEnglish
Pages (from-to)26893-26909
Number of pages17
JournalACS Applied Materials and Interfaces
Volume15
Issue number22
DOIs
StatePublished - 7 Jun 2023

Keywords

  • bifunctional
  • DFT
  • HER
  • OER
  • water splitting

Fingerprint

Dive into the research topics of 'Density Functional Theory Approximations and Experimental Investigations on Co1-xMoxTe2 Alloy Electrocatalysts Tuning the Overall Water Splitting Reactions'. Together they form a unique fingerprint.

Cite this