Journal
CHEMICAL ENGINEERING JOURNAL
Volume 385, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123871
Keywords
Inorganic-organic; Complex heterojunction; Ethylenediamine; Solvothermal; Hydrogen generation
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2017H1D3A1A02014020]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1A2C1006402]
- National Research Foundation of Korea [2019R1A2C1006402, 2017H1D3A1A02014020] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An inorganic-organic CdSe(en)(0.5)/CdIn2S4/TiO2 complex heterostructure was successfully synthesized using a facile solvothermal method. The morphology of a CdSe(en)(0.5)/CdIn2S4/TiO2 heterostructure was controlled by varying the concentrations of cadmium nitrate and selenium precursors in ethylenediamine. Intentionally controlling the morphology enhances the absorption within the visible region compared to a ZnIn2S4/TiO2 photoanode. The photoelectrochemical (PEC) study shows that the CdSe(en)(0.5)/CdIn2S4/TiO2 photoanode complex heterostructure exhibits a photocurrent density of 2.43 mA cm(-2) at 0 V versus Ag/AgCl, which is 180% higher than that of a ZnIn2S4/TiO2 photoanode. The extra-delayed lifetime and photostability of CdSe(en)(0.5)/CdIn2S4/TiO2 complex heterojunction is cause of efficient hole scavenging. During the PEC measurement, the Se and ethylenediamine leaches out into the electrolyte while S-2- from the Na2S + Na2SO3 electrolyte reacts with surface of the CdSe(en)(0)(.5)/CdIn2S4/TiO2 complex heterojunction. Such structure can effectively separate the charge carrier and yields 100 mu mol of hydrogen within 3 h. The possible charge transfer mechanism during solar hydrogen generation in an inorganic-organic CdSe(en)(0)(.5)/CdIn2S4/TiO2 complex heterojunction structure has also been proposed.
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