Design Principle and Loss Engineering for Photovoltaic-Electrolysis Cell System

Woo Je Chang, Kyung Hwan Lee, Heonjin Ha, Kyoungsuk Jin, Gunho Kim, Sun Tae Hwang, Heon Min Lee, Seh Won Ahn, Wonki Yoon, Hongmin Seo, Jung Sug Hong, Yoo Kyung Go, Jung Ik Ha, Ki Tae Nam

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The effects of exchange current density, Tafel slope, system resistance, electrode area, light intensity, and solar cell efficiency were systematically decoupled at the converter-assisted photovoltaic-water electrolysis system. This allows key determinants of overall efficiency to be identified. On the basis of this model, 26.5% single-junction GaAs solar cell was combined with a membrane-electrode-assembled electrolysis cell (EC) using the dc/dc converting technology. As a result, we have achieved a solar-to-hydrogen conversion efficiency of 20.6% on a prototype scale and demonstrated light intensity tracking optimization to maintain high efficiency. We believe that this study will provide design principles for combining solar cells, ECs, and new catalysts and can be generalized to other solar conversion chemical devices while minimizing their power loss during the conversion of electrical energy into fuel.

Original languageEnglish
Pages (from-to)1009-1018
Number of pages10
JournalACS Omega
Volume2
Issue number3
DOIs
Publication statusPublished - 2017 Mar 31
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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