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Open Access Publications from the University of California

Emergent Degradation Phenomena Demonstrated on Resilient, Flexible, and Scalable Integrated Photoelectrochemical Cells

  • Author(s): Kistler, TA
  • Zeng, G
  • Young, JL
  • Weng, LC
  • Aldridge, C
  • Wyatt, K
  • Steiner, MA
  • Solorzano, O
  • Houle, FA
  • Toma, FM
  • Weber, AZ
  • Deutsch, TG
  • Danilovic, N
  • et al.

Photoelectrochemical (PEC) water splitting provides a pathway to generate sustainable clean fuels using the two most abundant resources on Earth: sunlight and water. Currently, most of the successful models of PEC cells are still fabricated on small scales near 1 cm , which largely limits the mass deployment of solar-fuel production. Here, the scale-up to 8 cm of an integrated PEC (IPEC) device is demonstrated and its performance compared to a 1 cm IPEC cell, using state-of-the-art iridium and platinum catalysts with III–V photoabsorbers. The initial photocurrents at 1 sun are 8 and 7 mA cm with degradation rates of 0.60 and 0.47 mA cm  day , during unbiased operation for the 1 and 8 cm devices, respectively. Evaluating under outdoor and indoor conditions at two U.S. National Laboratories reveals similar results, evidencing the reproducibility of this design's performance. Furthermore, the emerging degradation mechanisms during scale-up are investigated and the knowledge gained from this work will provide feedback to the broader community, since PEC device durability is a limiting factor in its potential future deployment. 2 2 2 −2 −2 −1 2

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