材料科学
分解水
制作
纳米技术
串联
制氢
光电子学
兴奋剂
氢
催化作用
光催化
病理
复合材料
医学
有机化学
化学
替代医学
生物化学
作者
Pongkarn Chakthranont,Thomas R. Hellstern,Joshua M. McEnaney,Thomas F. Jaramillo
标识
DOI:10.1002/aenm.201701515
摘要
Abstract Tandem photoelectrochemical water splitting cells utilizing crystalline Si and metal oxide photoabsorbers are promising for low‐cost solar hydrogen production. This study presents a device design and a scalable fabrication scheme for a tandem heterostructure photoanode: p + n black silicon (Si)/SnO 2 interface/W‐doped bismuth vanadate (BiVO 4 )/cobalt phosphate (CoPi) catalyst. The black‐Si not only provides a substantial photovoltage of 550 mV, but it also serves as a conductive scaffold to decrease charge transport pathlengths within the W‐doped BiVO 4 shell. When coupled with cobalt phosphide (CoP) nanoparticles as hydrogen evolution catalysts, the device demonstrates spontaneous water splitting without employing any precious metals, achieving an average solar‐to‐hydrogen efficiency of 0.45% over the course of an hour at pH 7. This fabrication scheme offers the modularity to optimize individual cell components, e.g., Si nanowire dimensions and metal oxide film thickness, involving steps that are compatible with fabricating monolithic devices. This design is general in nature and can be readily adapted to novel, higher performance semiconducting materials beyond BiVO 4 as they become available, which will accelerate the process of device realization.
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