Photoelectrochemical Characterization of Nano-Crednerite AgMnO2 Synthesized by Auto-Ignition: a Novel Photocatalyst for H2 Evolution

N. Koriche N. Koriche , R. Brahimi R. Brahimi , B. Bellal B. Bellal , M. Trari M. Trari
Российский электрохимический журнал
Abstract / Full Text

AgMnO2 nanocrystallites (31 nm) were prepared by sol-gel auto-ignition at 400°C in air. The crednerite characterized by X-ray diffraction (XRD) showed a single phase, crystallizing in a monoclinic unit cell (SG: C2/m). The refinement was made by isotypy with CuMnO2. The oxide is a narrow band-gap semiconductor with an indirect transition at 1.43 eV. The electrical conduction occurs predominantly by small polaron hopping between mixed valences Ag2+/+ in the (a, b) planes with an activation energy of 0.35 eV. The density of holes (NA = 2 × 1015 cm–3) and their mobility (μh = 0.8 × 10–4 m–2 V–1 s–1) indicate a conduction being thermally activated. The oxygen insertion in the layered crystal lattice induces p-type conductivity, a fact confirmed by the electrochemical measurements. The flat band potential (Efb = –0.04 V) indicates a cationic character of both valence and conduction bands deriving mostly from Ag+ 4d-orbital. The electrochemical impedance spectroscopy shows the predominance of the bulk contribution followed by diffusion of O2– species. The energetic band diagram of AgMnO2 established from the photoelectrochemical study, predicts a spontaneous hydrogen formation; a rate evolution of 39 µmol g–1 min–1 and a power conversion of 0.37% were obtained under visible light irradiation (27 mW cm–2).

Author information
  • Faculty of Sciences, University M’hamed Bougara (UMBB), 35000, Boumerdes, Algeria

    N. Koriche

  • Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, University of Sciences and Technology (USTHB), 16111, Algiers, Algeria

    N. Koriche, R. Brahimi, B. Bellal & M. Trari

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