A Stand-Alone Si-Based Porous Photoelectrochemical Cell

Wouter J.C. Vijselaar, Paula Perez-Rodriguez, Pieter J. Westerik, Roald M. Tiggelaar, Arno H.M. Smets, Han Gardeniers*, Jurriaan Huskens*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
23 Downloads (Pure)

Abstract

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 IrO x 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 η 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 H 2 SO 4 , a pH gradient-free system is observed thus completely avoiding the build-up of a counteracting potential.

Original languageEnglish
Article number1803548
JournalAdvanced energy materials
Volume9
Issue number19
DOIs
Publication statusPublished - 16 May 2019

Keywords

  • micropores
  • pH gradient
  • silicon
  • stand-alone photoelectrochemical
  • wireless

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  • Cite this

    Vijselaar, W. J. C., Perez-Rodriguez, P., Westerik, P. J., Tiggelaar, R. M., Smets, A. H. M., Gardeniers, H., & Huskens, J. (2019). A Stand-Alone Si-Based Porous Photoelectrochemical Cell. Advanced energy materials, 9(19), [1803548]. https://doi.org/10.1002/aenm.201803548