A low-cost photoelectrochemical tandem cell for highly-stable and efficient solar water splitting
A low-cost photoelectrochemical tandem cell for highly-stable and efficient solar water splitting
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DOI：
10.1016/j.nanoen.2017.09.032
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发表时间：
2017-11
期刊：
影响因子：
17.6
通讯作者：
Qingyi Zeng;Bai Jing;Jinhua Li;B. Zhou;Yugang Sun
中科院分区：
文献类型：
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作者：
Qingyi Zeng;Bai Jing;Jinhua Li;B. Zhou;Yugang Sun
太阳能水分解系统的稳定性和成本仍然是其大规模实施的主要瓶颈。在此，设计巧妙的低成本光电化学串联电池具有三个性能优越的组件，即，报道了一种新颖的前光电阳极，其由外延涂覆有[001]取向的TiO 2纳米颗粒的WO 3纳米片、后Si光伏电池和层间扩展的MoS 2纳米结构的反阴极组成，用于高度稳定和高效的太阳能水分解。在35天的测试中，串联电池显示出接近1的水分解库仑效率，以及高且持续稳定的太阳能-氢气效率。结果还表明，它是通用的太阳能驱动的废水处理。最重要的是，首次提出使用基于双匹配（即晶格匹配和能带匹配）的外延生长的复合光阳极在稳定性和光电化学性能方面显示出显著的改善，其中WO_3/TiO_2光阳极的光电流在连续测试100 h后没有明显衰减，比92%提高了80%，WO 3光阳极的光电流衰减。外延TiO 2层有利于界面电荷传输，并提供了一个完整的密封WO 3表面在原子水平。这种高效的界面设计和高性能纳米材料的系统级集成为太阳能水分解用于可再生氢燃料生产的潜在大规模实施提供了独特的启示。
The stability and cost of solar-driven water splitting system are still the main bottlenecks for its large-scale implementation. Here, an ingeniously designed low-cost photoelectrochemical tandem cell possessing three performance-superior components, i.e., a front novel photoanode of WO3nanoplates epitaxially coated with [001]-oriented TiO2nanoprickles, and a rear Si photovoltaic cell, and a counter-cathode of interlayer-expanded MoS2nanostructures, is reported for highly-stable and efficient solar water splitting. The tandem cell shows a close-to-unity Coulomb efficiency for water splitting, and a high and sustained-stable solar-to-hydrogen efficiency in a 35 days’ test. The result also reveals that it is versatile in solar-driven wastewater treatment. Most importantly, the composite photoanode that, for the first time, is proposed using epitaxial-growth based on double-match, i.e. lattice match and band match, shows dramatical improvement in stability and photoelectrochemical performance, in which the photocurrent of the WO3/ TiO2photoanode is improved by 80% without any obvious decay after 100 h of continuous testing compared with a 92% decay in photocurrent for the WO3photoanode. The epitaxial TiO2layer facilitates interfacial charge transportations and provides a complete sealing of WO3surfaces at an atomic level. Such efficient interfacial design and system-level integration of high-performance nanomaterials shed a unique light on the potential large-scale implementation of solar water splitting for renewable hydrogen fuel production.