Bismuth Vanadate Photoelectrodes with High Photovoltage as Photoanode and Photocathode in Photoelectrochemical Cells for Water Splitting

  • Wayler S. dos Santos
    Institute of Science, Engineering, and Technology (ICET) Federal University of the Jequitinhonha and Mucuri Valleys (UFVJM), Campus Mucuri 39803-371 Teófilo Otoni, Minas Gerais Brazil
  • Mariandry Rodriguez
    Institute of Science, Engineering, and Technology (ICET) Federal University of the Jequitinhonha and Mucuri Valleys (UFVJM), Campus Mucuri 39803-371 Teófilo Otoni, Minas Gerais Brazil
  • Júlia M. O. Khoury
    Institute of Science, Engineering, and Technology (ICET) Federal University of the Jequitinhonha and Mucuri Valleys (UFVJM), Campus Mucuri 39803-371 Teófilo Otoni, Minas Gerais Brazil
  • Luíza A. Nascimento
    Institute of Science, Engineering, and Technology (ICET) Federal University of the Jequitinhonha and Mucuri Valleys (UFVJM), Campus Mucuri 39803-371 Teófilo Otoni, Minas Gerais Brazil
  • Rebecca J. P. Ribeiro
    Institute of Science, Engineering, and Technology (ICET) Federal University of the Jequitinhonha and Mucuri Valleys (UFVJM), Campus Mucuri 39803-371 Teófilo Otoni, Minas Gerais Brazil
  • João P. Mesquita
    Department of Chemistry UFVJM, Campus JK 39100-000 Diamantina, Minas Gerais Brazil
  • Adilson C. Silva
    Institute of Exact and Biological Sciences Federal University of Ouro Preto (UFOP) 35400-000 Ouro Preto, Minas Gerais Brazil
  • Francisco G. E. Nogueira
    Department of Chemical Engineering Federal University of São Carlos (UFSCar) 13565-905 São Carlos São Paulo Brazil
  • Márcio C. Pereira
    Institute of Science, Engineering, and Technology (ICET) Federal University of the Jequitinhonha and Mucuri Valleys (UFVJM), Campus Mucuri 39803-371 Teófilo Otoni, Minas Gerais Brazil

抄録

<jats:title>Abstract</jats:title><jats:p>Using dual‐photoelectrode photoelectrochemical (PEC) devices based on earth‐abundant metal oxides for unbiased water splitting is an attractive means of producing green H<jats:sub>2</jats:sub> fuel, but is challenging, owing to low photovoltages generated by PEC cells. This problem can be solved by coupling n‐type BiVO<jats:sub>4</jats:sub> with n‐type Bi<jats:sub>4</jats:sub>V<jats:sub>2</jats:sub>O<jats:sub>11</jats:sub> to create a virtual p/n junction due to the formation of a hole‐inversion layer at the semiconductor interface. Thus, photoelectrodes with high photovoltage outputs were synthesized. The photoelectrodes exhibited features of p‐ and n‐type semiconductors when illuminated under an applied bias, suggesting their use as photoanode and photocathode in a dual‐photoelectrode PEC cell. This concept was proved by connecting a 1 mol % W‐doped BiVO<jats:sub>4</jats:sub>/Bi<jats:sub>4</jats:sub>V<jats:sub>2</jats:sub>O<jats:sub>11</jats:sub> photoanode with an undoped BiVO<jats:sub>4</jats:sub>/Bi<jats:sub>4</jats:sub>V<jats:sub>2</jats:sub>O<jats:sub>11</jats:sub> photocathode, which produced a high photovoltage of 1.54 V, sufficient to drive stand‐alone water splitting with 0.95 % efficiency.</jats:p>

収録刊行物

  • ChemSusChem

    ChemSusChem 11 (3), 589-597, 2018-01-17

    Wiley

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