Ruthenium and palladium oxide promoted zinc oxide nanoparticles: Efficient electrocatalysts for hydrazine oxidation reaction

Khan S. f., Shah S. S., Ahmad A., BAYRAKÇEKEN YURTCAN A., Jabeen E., Alshgari R. A., ...Daha Fazla

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, cilt.917, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 917
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.jelechem.2022.116422
  • Dergi Adı: JOURNAL OF ELECTROANALYTICAL CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, Chimica, Compendex, INSPEC
  • Anahtar Kelimeler: Hydrazine, Electrooxidation, HzOR, Gamma alumina, Metal oxide electrocatalyst, Zinc oxide, Ruthenium, Palladium, Co-impregnation, Cyclic voltammetry, HYDROGEN GENERATION, CATALYTIC DECOMPOSITION, CARBON, METAL, ELECTROOXIDATION, SIZE, CO2, ELECTRODE, PLATINUM, FUELS
  • Atatürk Üniversitesi Adresli: Evet

Özet

Development of highly catalyzing electrode materials for hydrazine electrooxidation reaction (HzOR) demands a judicious assortment of intrinsically active candidates, precise engineering of electrodes for enhancement of active sites and building of electronically conductive structures. Herein, we report the novel, innovative and robust heterogeneous electrocatalysts for HzOR for ultimate hydrogen generation and their applicability in direct hydrazine fuel cell (DHFC). The presented catalysts comprised of ZnO microparticles supported on gamma- Al(2)O(3 )with different weight percentages (10, 20, 30, 40 wt/wt%). Binary catalyst i.e. 20% ZnO/Al2O3 displayed the maximum catalytic output towards HzOR, so it is chosen to further combine with RuO2 and PdO to investigate a promoted and enhanced oxidation output. Ternary metal oxide catalysts i.e. RuO2-ZnO/Al2O3 and PdOZnO/Al2O3 with varied contents of RuO2 and PdO (0.1, 0.5 and 1 wt/wt%) are prepared via co-impregnation method. X-Ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy coupled energy dispersive spectroscopy (SEM-EDS), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) are the techniques employed for physio-chemical characterization of samples. Among all the investigated catalysts, 1% PdO-ZnO/Al2O3 produced the most catalyzing behavior toward HzOR owing to its largest diffusion coefficient (50.0 x 10(-6) cm(2 )s(-1)), highest current density (5.2 mA cm(-2)) and high ECSA (0.23 cm(2)). The catalysts showed sufficient reproducibility and stability by scanning multiple cycles and testing similar electrodes after different time intervals. This is the first study of hydrazine electrooxidation protocol employing RuO(2 )and PdO promoted gamma-alumina supported ZnO structured electrocatalysts.