Near-infrared-driven water splitting for hydrogen evolution using a Cu2ZnSnS4-based photocathode by the application of upconversion nanoparticles
Near-infrared-driven water splitting for hydrogen evolution using a Cu2ZnSnS4-based photocathode by the application of upconversion nanoparticles
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通过应用上转换纳米粒子，使用基于 Cu2ZnSnS4 的光电阴极进行近红外驱动的水分解以析氢
DOI：
10.1039/d0se00152j
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发表时间：
2020-03
影响因子：
5.6
通讯作者：
Jiang Feng
中科院分区：
文献类型：
--
作者：
Feng Kuang;Cai Zhiwang;Huang Dingwang;Li Lintao;Wang Kang;Li Yan;Wang Chenyang;Song Jie;Zhao Lingzhi;Wei Wei;Jiang Feng
近年来，光电化学（PEC）水裂解已成为利用太阳能生产可再生氢气的一种有吸引力的方法。通过太阳能水分解实现高效制氢需要具有合适带隙的半导体。通常，宽带隙导致太阳能水分解装置的理想开路电压，但它使装置不能吸收和利用太阳光的近红外（NIR）部分。为了进一步提高太阳能的利用效率，我们采用合理设计的核-壳或核-壳-壳结构的上转换纳米颗粒（UCNPs）作为“纳米转换器”，使近红外光转换为可见光;因此，近红外光可以被可见光响应光电阴极间接吸收。在掺杂不同的镧系元素后，我们制备的UCNP获得将NIR光（980 nm）转换成蓝光、绿色或红光的能力。虽然Cu 2 ZnSnS 4（CZTS）光电阴极显示出对可见光的优异响应，但它几乎不能吸收超过860 nm的近红外光。在缓冲溶液中加入UCNPs后，CZTS基光电阴极在980 nm照射下在0 VRHE下表现出可观的光电流密度为−4 mA cm−2。这项工作表明，太阳能到氢的转换效率的光电极可以进一步提高与UCNPs作为近红外能量转换器的参与。
In recent years, photoelectrochemical (PEC) water splitting has become an attractive approach for the production of renewable hydrogen by utilizing solar energy. Achieving high-efficiency hydrogen production via solar water splitting requires a semiconductor with a suitable band gap. Generally, a wide band gap results in an ideal open-circuit voltage for solar water splitting devices, but it makes the devices incapable of absorbing and utilizing the near-infrared (NIR) portion of sunlight. To further improve the utilization efficiency for solar energy, we employ rationally designed core–shell or core–shell–shell structured upconversion nanoparticles (UCNPs) as “nanotransducers” that enable the conversion of NIR light into visible light; thus, NIR light can be indirectly absorbed by visible light-responsive photocathodes. Upon doping with different lanthanides, our prepared UCNPs gain the ability to convert NIR light (980 nm) into blue, green, or red light. Although the Cu2ZnSnS4 (CZTS) photocathode shows an excellent response to visible light, it is almost unable to absorb NIR light beyond 860 nm. After addition of UCNPs into the buffer solution, the CZTS-based photocathode exhibits an appreciable photocurrent density of −4 mA cm−2 at 0 VRHE under 980 nm irradiation. This work demonstrates that the solar-to-hydrogen conversion efficiency of the photoelectrode can be further boosted with the involvement of UCNPs as a NIR energy converter.
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通讯作者：
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影响因子：
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