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Understanding the fundamental electrical and photoelectrochemical behavior of a hematite photoanode.
Soares, Mario R S; Gonçalves, Ricardo H; Nogueira, Içamira C; Bettini, Jefferson; Chiquito, Adenilson J; Leite, Edson R.
Afiliação
  • Soares MR; Chemistry Department, Federal University of São Carlos, São Carlos, SP, Brazil. edson.leite@pq.cnpq.br.
  • Gonçalves RH; Chemistry Department, Federal University of São Carlos, São Carlos, SP, Brazil. edson.leite@pq.cnpq.br.
  • Nogueira IC; Postgraduate Program in Materials Engineering, Federal Institute of Maranhão - IFMA, São Luís, MA, Brazil.
  • Bettini J; Laboratório Nacional de Nanotecnologia LNNano, Caixa Postal 6192, BR-13083970, Campinas, SP, Brazil.
  • Chiquito AJ; Physics Department, Federal University of São Carlos, São Carlos, SP, Brazil.
  • Leite ER; Chemistry Department, Federal University of São Carlos, São Carlos, SP, Brazil. edson.leite@pq.cnpq.br.
Phys Chem Chem Phys ; 18(31): 21780-8, 2016 Aug 03.
Article em En | MEDLINE | ID: mdl-27436162
Hematite is considered to be the most promising material used as a photoanode for water splitting and here we utilized a sintered hematite photoanode to address the fundamental electrical, electrochemical and photoelectrochemical behavior of this semiconductor oxide. The results presented here allowed us to conclude that the addition of Sn(4+) decreases the grain boundary resistance of the hematite polycrystalline electrode. Heat treatment in a nitrogen (N2) atmosphere also contributes to a decrease of the grain boundary resistance, supporting the evidence that the presence of oxygen is fundamental for the formation of a voltage barrier at the hematite grain boundary. The N2 atmosphere affected both doped and undoped sintered electrodes. We also observed that the heat treatment atmosphere modifies the surface states of the solid-liquid interface, changing the charge-transfer resistance. A two-step treatment, with the second being performed at a low temperature in an oxygen (O2) atmosphere, resulted in a better solid-liquid interface.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Chem Chem Phys Assunto da revista: BIOFISICA / QUIMICA Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Chem Chem Phys Assunto da revista: BIOFISICA / QUIMICA Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido