Exploration of carbon additives to the synthesis of Cu2Mo6S8 structures and their electrocatalytic activity in oxygen reduction reaction

Karanfil G., Coskun H., Karakis M., Sarilmaz A., Gencer A., Sürücü G., ...Daha Fazla

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, cilt.47, sa.8, ss.5326-5336, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 47 Sayı: 8
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.ijhydene.2021.11.180
  • Dergi Adı: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.5326-5336
  • Anahtar Kelimeler: Chevrel phases, Cu2Mo6S8, Oxygen reduction reaction, Density functional theory, Lattice dynamic properties, TOTAL-ENERGY CALCULATIONS, POROUS CARBON, SULFIDE NANOPARTICLES, HIGHLY EFFICIENT, EVOLUTION, GRAPHENE, CU, NITROGEN
  • Gazi Üniversitesi Adresli: Evet

Özet

Catalytic processes are contemplated as break point in generating alternative and sustainable energy platforms. The cathodic oxygen reduction reaction (ORR) is an important catalytic system, mainly finding practice in fuel cell and metal-air battery technologies. This work presents the synthesis, structural characterization and electrocatalytic properties of three different Cu2Mo6S8 structures as alternative ORR electrocatalysts. The effect of different carbon additives during synthesis was studied and no positive influence of the carbon addition was indicated. Our findings show that only the bare Cu2Mo6S8 enhances the ORR electro-performance to class with the state-of-the-art ORR catalysts. Excellent stability of 10,000 consecutive ORR cycles, a superior onset potential of 0.894 V and halfwave (E-1/2) potential of 0.641 V vs. reversible hydrogen electrode (RHE) increase the noteworthiness of the Cu2Mo6S8 electrodes. Aside from experimental investigations, density functional theory calculations deliver profound knowledge on the structural and electronic properties (electronic band structure, partial density of states and electron density) of Cu2Mo6S8. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.