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Issue 25, 2018
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Enhanced light trapping and high charge transmission capacities of novel structures for efficient photoelectrochemical water splitting

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Abstract

Excellent PEC efficiency, good reusability and the super stability of trap-like SnS2/TiO2 nanotube arrays (NTs)-based photoanodes are reported. Specifically, the SnS2/TiO2-180 °C (ST-180) photoanode exhibited the highest photocurrent density (1.05 mA cm−2) and an optimal η (0.73%) at 0.5 V (vs. SCE) under simulated light irradiation (AM 1.5G), which are 4.6 and 3.8 times higher than those of pure TiO2 NTs (0.23 mA cm−2 and 0.19%). The IPCE values of ST-180 can reach 21.5% (365 nm) and 13.8% (420 nm), which are much higher than those of pure TiO2 NTs (10.6% at 365 nm and 0.8% at 420 nm). The APCE values of the pure TiO2 NTs photoelectrode are 12.8% (365 nm) and 1.1% (420 nm), while the ST-180 values are 22.3% and 14.2%, respectively. Furthermore, the generation rates of H2 and O2 for the ST-180 photoanode are 47.2 and 23.1 μmol cm−2 h−1 at 0.5 V under AM 1.5G, corresponding to faradaic efficiencies of around 80.1% and 78.3%, respectively. In short, the high-efficiency PEC water splitting performance of this SnS2/TiO2 photoanode results from the enhanced light harvesting ability of the trap-like SnS2 structure, accelerated carrier transportation properties of TiO2 NTs, and effective carrier separation of the type-II heterojunction structure. This work may offer a combinatorial strategy for the preparation of heterojunction structures with high PEC performance and can be a model structure for similar photoanode materials.

Graphical abstract: Enhanced light trapping and high charge transmission capacities of novel structures for efficient photoelectrochemical water splitting

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Publication details

The article was received on 14 Apr 2018, accepted on 28 May 2018 and first published on 29 May 2018


Article type: Paper
DOI: 10.1039/C8NR03040E
Citation: Nanoscale, 2018,10, 11881-11893
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    Enhanced light trapping and high charge transmission capacities of novel structures for efficient photoelectrochemical water splitting

    J. Mu, H. Miao, E. Liu, J. Feng, F. Teng, D. Zhang, Y. Kou, Y. Jin, J. Fan and X. Hu, Nanoscale, 2018, 10, 11881
    DOI: 10.1039/C8NR03040E

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