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A Stand-Alone Si-Based Porous Photoelectrochemical Cell

机译：一个独立的Si基多孔光电子化学电化细胞

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摘要

Wireless photoelectrochemical (PEC) devices promise easy device fabrication as well as reduced losses. Here, the design and fabrication of a stand-alone ion exchange material-embedded, Si membrane-based, photoelectrochemical cell architecture with micron-sized pores is shown, to overcome the i) pH gradient formation due to long-distance ion transport, ii) product crossover, and iii) parasitic light absorption by application of a patterned catalyst. The membrane-embedded PEC cell with micropores utilizes a triple Si junction cell as the light absorber, and Pt and IrOx as electrocatalysts for the hydrogen evolution reactions and oxygen evolution reactions, respectively. The solar-to-hydrogen efficiency of 7% at steady-state operation, as compared to an unpatterned (PV) of 10.8%, is mainly attributed to absorption losses by the incorporation of the micropores and catalyst microdots. The introduction of the Nafion ion exchange material ensures an intrinsically safe PEC cell, by reducing the total gas crossover to 0.1%, while without a cation exchange membrane, a crossover of 6% is observed. Only in a pure electrolyte of 1 m H2SO4, a pH gradient-free system is observed thus completely avoiding the build-up of a counteracting potential.
机译：无线光电化学（PEC）设备承诺易于设备制造以及减少损耗。这里，示出了独立离子交换材料嵌入式，基于Si膜的光电化学电池架的设计和制造，具有微米尺寸的孔，以克服I）pH由于长距离离子转运而导致的pH梯度形成，II ）产品交叉和III）通过施加图案化催化剂寄生光吸收。具有微孔的膜嵌入的PEC细胞利用三重Si结电池作为光吸收，Pt和Irox分别作为氢进化反应和氧进化反应的电催化剂。与未取出的稳态（PV）相比，稳态操作的太阳能 - 氢效率为7％，而不是10.8％，主要归因于掺入微孔和催化剂微陶器的吸收损失。通过将总气体交叉降低到<0.1％，而无需阳离子交换膜，引入氮离子交换材料的引入确保了本质安全的PEC细胞，观察到> 6％的交叉。仅在1M H 2 SO 4的纯电解质中，观察到pH梯度系统，从而完全避免了抵抗潜力的积累。

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