Hydrothermally synthesized nickel molybdenum selenide composites as cost-effective and efficient trifunctional electrocatalysts for water splitting reactions

Kumar Premnath, Prabhakarn Arunachalam, Mabrook S. Amer, Jagannathan Madhavan, Abdullah M. Al-Mayouf

Research output: Contribution to journalJournal articlepeer-review

22 Scopus citations

Abstract

The development of efficient, cost-effective routes to prepare non-platinum-based electrocatalysts is a significant scientific challenge in water-splitting systems. A multifunctional electrocatalyst for the hydrogen evolution, oxygen evolution, and oxygen reduction reactions (HER/OER/ORR) involved in the water-splitting process was fabricated using a simple and eco-friendly strategy. The present study involves the simple synthesis of nanostructured nickel selenide (NiSe) via a hydrothermal method. The different phases of nickel selenide and their dependency on the precursor concentration were analyzed using X-ray diffraction (XRD). The morphologies of coral-like structured pure and Mo-doped NiSe (Ni1-xMoxSe) samples were investigated systematically using scanning electron microscopy (SEM). The as-prepared Ni0.5Mo0.5Se material showed an enhanced electrochemical activity of 1.57 V @ 10 mA/cm2 for OER and 0.19 V @ 10 mA/cm2 to HER, and follows the Volmer-Heyrovsky for HER mechanism. In addition, the electrocatalyst exhibits a large electrochemical surface area and high stability. Therefore, the hydrothermally synthesized Ni1–xMoxSe has been proven to be a perfect platinum-free trifunctional electrocatalyst for water splitting process.

Original languageEnglish
Pages (from-to)22796-22805
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number41
DOIs
StatePublished - 30 Aug 2019

Keywords

  • Electrocatalysis
  • Hydrogen evolution reaction
  • Nickel selenides
  • Oxygen evolution reaction
  • Renewable energy

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