Hydroxyapatite-Supported Nickel(0) Nanoparticles: A Cost-Effective and Efficient Electrocatalyst for Oxygen Evolution Reaction in Alkaline Media

Arabacı E., Akbayrak S., ÖNAL A. M., ÖZKAR S.

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, cilt.172, sa.4, 2025 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 172 Sayı: 4
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1149/1945-7111/adcda0
  • Dergi Adı: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Analytical Abstracts, Applied Science & Technology Source, Chemical Abstracts Core, Chimica, Compendex, Computer & Applied Sciences, INSPEC
  • Anahtar Kelimeler: electrocatalyst, hydroxyapatite, nanoparticles, nickel, oxygen evolution reaction
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Water splitting for hydrogen production is a crucial technology for sustainable energy alternatives. The oxygen evolution process (OER) poses a considerable problem owing to its sluggish kinetics. This study examines the electrocatalytic characteristics of hydroxyapatite-supported nickel nanoparticles (Ni/HAp) as a promising catalyst for OER in alkaline environments. Ni/HAp nanoparticles were made via a straightforward impregnation-reduction procedure, and their structural and electrochemical characteristics are analyzed using a combination of analytical techniques including X-ray diffraction, field-effect scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and electrochemical methods. The Ni/HAp electrocatalyst exhibits an onset potential of 1.61 V (vs RHE), an overpotential of 521 mV at a current density of 5 mAcm-2, and a Tafel slope of 148.9 mVdec-1 in a 1.0 M KOH solution. The high turnover frequency (0.747 s-1 at 350 mV) and double-layer capacitance (0.0208 mFcm-2) indicate the material's potential for catalytic activity. The results suggest that Ni/HAp is a promising and cost-effective electrocatalyst for the OER.