期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 4, 期 3, 页码 1161-1168出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b01229
关键词
1D transparent conducting oxides; CdSe/CdS/TiO2 heterojunction; In2O3:Sn nanowire array; Photoelectrochemical hydrogen production; Charge transport
资金
- National Science Foundation [CMMI-1333182, EPMD-1408025]
- Global Frontier R&D Program on Center for Multiscale Energy System, Korea [2012M3A6A7054855]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2015R1C1A1A01053785]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1333182] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1408025] Funding Source: National Science Foundation
- National Research Foundation of Korea [2015R1C1A1A01053785] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
For photoelectrochemical (PEC) hydrogen production, low charge transport efficiency of a photoelectrode is one of the key factors that largely limit PEC performance enhancement. Here, we report a tin-doped indium oxide (In2O3:Sn, ITO) nanowire array (NWs) based CdSe/CdS/TiO2 multishelled heterojunction photoelectrode. This multi shelled one-dimensional (1D) heterojunction photoelectrode shows superior charge transport efficiency due to the negligible carrier recombination in ITO NWs, leading to a greatly improved photocurrent density (similar to 16.2 mA/cm(2) at 1.0 V vs RHE). The ITO NWs with an average thickness of similar to 12 mu m are first grown on commercial ITO/glass substrate by a vapor liquid solid method. Subsequently, the TiO2 and CdSe/CdS shell layers are deposited by an atomic layer deposition (ALD) and a chemical bath deposition method, respectively. The resultant CdSe/CdS/TiO2/ITO NWs photoelectrode, compared to a planar structure with the same configuration, shows improved light absorption and much faster charge transport properties. More importantly, even though the CdSe/CdS/TiO2/ITO NWs photoelectrode has lower CdSe/CdS loading (i.e., due to its lower surface area) than the mesoporous TiO2 nanoparticle based photoelectrode, it shows 2.4 times higher saturation photocurrent density, which is attributed to the superior charge transport and better light absorption by the 1D ITO NWs.
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