caa a22 4500 463234367 CHVBK 20180405153252.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10853-006-1250-x doi (NATIONALLICENCE)springer-10.1007/s10853-006-1250-x The physical and photo electrochemical characterization of the crednerite CuMnO2 [Elektronische Daten] [Yassine Bessekhouad, Yamina Gabes, Aissa Bouguelia, Mohamed Trari] CuMnO2 is prepared via Cu+→Li+ exchange in molten copper (I) chloride. It crystallizes in a monoclinic structure (SG C2/m) where the MnO6 octahedra elongation is ascribed to the Yahn-Teller (Y-T) effect of Mn3+ ions. From chemical analysis, the oxide is more accurately formulated as CuMnO2.01. Above 250°C, it undergoes a reversible transition to spinel Cu x Mn3−x O4 and beyond 940°C it converts back to Cu1.1Mn0.9O2. Extrapolation of high-temperature magnetic data indicates T-intercept θ p of −450K and an effective moment of 5.22μB, consistent with strong antiferromagnetism in the basal plans and high spin (HS) configuration Mn3+. This value is slightly larger than that of the spin only moment, a behavior ascribed to Cu2+ originating from oxygen insertion. As prepared, CuMnO2 displays p-type conductivity with an activation energy of 0.16eV. Most holes generated upon band gap excitation are trapped on Cu+ ions and the conduction occurs by small polarons hopping between neighboring sites. The linear increase of thermopower for Cu1.05Mn0.95O2 with temperature indicates a hole mobility μ300K (3.5×10-6cm2V−1s−1) thermally activated. CuMnO2 is made p- and n-type and the difference in the carriers mobilities is attributed to different oxygen polyhedra. The title oxide, characterized photo electrochemically, exhibits a pH-insensitive flat band potential (+0.13VSCE). The valence band, located at 5.3eV below vacuum, is made up of Cu 3d orbital. As application, the powder showed a good performance for the H2-photo evolution. Springer Science+Business Media, LLC, 2007 Bessekhouad Yassine Laboratoire de Stockage et de Valorisation des Energies Renouvelables, USTHB, BP 32 El-Alia, 16111, Algiers, Algeria aut Gabes Yamina Laboratoire de Stockage et de Valorisation des Energies Renouvelables, USTHB, BP 32 El-Alia, 16111, Algiers, Algeria aut Bouguelia Aissa Laboratoire de Stockage et de Valorisation des Energies Renouvelables, USTHB, BP 32 El-Alia, 16111, Algiers, Algeria aut Trari Mohamed Laboratoire de Stockage et de Valorisation des Energies Renouvelables, USTHB, BP 32 El-Alia, 16111, Algiers, Algeria aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6469-6476 0022-2461 42:15<6469 2007 42 10853 https://doi.org/10.1007/s10853-006-1250-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1250-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bessekhouad Yassine Laboratoire de Stockage et de Valorisation des Energies Renouvelables, USTHB, BP 32 El-Alia, 16111, Algiers, Algeria aut NATIONALLICENCE 700 1- Gabes Yamina Laboratoire de Stockage et de Valorisation des Energies Renouvelables, USTHB, BP 32 El-Alia, 16111, Algiers, Algeria aut NATIONALLICENCE 700 1- Bouguelia Aissa Laboratoire de Stockage et de Valorisation des Energies Renouvelables, USTHB, BP 32 El-Alia, 16111, Algiers, Algeria aut NATIONALLICENCE 700 1- Trari Mohamed Laboratoire de Stockage et de Valorisation des Energies Renouvelables, USTHB, BP 32 El-Alia, 16111, Algiers, Algeria aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6469-6476 0022-2461 42:15<6469 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer