Three-Dimensional GeSe Microstructured Air Brick Photocathode for Advanced Solar Water Splitting
Three-Dimensional GeSe Microstructured Air Brick Photocathode for Advanced Solar Water Splitting
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用于先进太阳能水分解的三维 GeSe 微结构空气砖光电阴极
DOI：
10.1002/solr.201900559
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发表时间：
2020
期刊：
影响因子：
7.9
通讯作者：
Jiang Feng
中科院分区：
文献类型：
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作者：
Wang Kang;Huang Dingwang;Li Lintao;Feng Kuang;Harada Takashi;Ikeda Shigeru;Li Jingbo;Jiang Feng
本文首次采用快速箱形热沉积法合成了空气砖结构的GeSe薄膜，这种新型空气砖结构的GeSe薄膜具有先进的光电化学（PEC）性能。研究发现，在化学浴沉积（CBD） CdS缓冲液之前，少量CdS纳米颗粒（NPs）在GeSe微空气砖（MAB）上的电极位置会影响CdS在GeSe微空气砖上的覆盖/钝化效率。在这种情况下，电沉积的CdS颗粒很可能是随后CBD过程中CdS生长/吸附Cd2+的种子，也可以作为吸附层和缓冲层之间的活性位点，收集电子并促进电子转移，最终减少复合损失。与不含CdS NPs的器件（3.6 mA cm - 2at 0 VRHE）相比，该器件的PEC性能，特别是电流密度（8 mA cm - 2at 0 VRHE）有明显提高。此外，用80 nm的原子层沉积tio2保护层进行表面改性，不仅可以将CdS层的光腐蚀减慢到5 h，还可以将半电池的太阳能-氢效率提高到1.47%。在持续的太阳光照射下，最终的Pt-TiO2 /CdS/CdS‐NP/GeSe MAB器件在3小时内产生了180 μmol以上的h2o2和90 μmol以上的o2。
Air brick‐structured GeSe is first synthesized by a rapid box thermal deposition method, and the GeSe thin film with such air brick novel structure demonstrates advanced photoelectrochemical (PEC) performance. It is found that the electrode position of a few CdS nanoparticles (NPs) on a GeSe microair brick (MAB) prior to the chemical bath deposition (CBD) of CdS buffer affects the coverage/passivation efficiency of CdS onto GeSe MAB. In this case, the electrodeposited CdS particles were likely to be the seed for CdS growth/adsorption of Cd2+during the subsequent CBD process and also could serve as active sites between the adsorbed layer and buffer layer for collecting electrons and facilitating their transfer, ultimately reducing the recombination loss. The PEC performance, especially the current density, is obviously improved (8 mA cm−2at 0 VRHE) compared with that of a device without CdS NPs (3.6 mA cm−2at 0 VRHE). Moreover, surface modification with an 80 nm atomic layer deposition TiO2protective layer not only slows the photocorrosion of the CdS layer to 5 h but also promotes the half‐cell solar‐to‐hydrogen efficiency to 1.47%. More than 180 μmol H2and 90 μmol O2are evolved during 3 h of sustained solar light illumination with the final Pt–TiO2/CdS/CdS‐NP/GeSe MAB device.