Highly efficient photochemical HCOOH production from CO2 and water using an inorganic system

Satoshi Yotsuhashi*, Hiroshi Hashiba, Masahiro Deguchi, Yuji Zenitani, Reiko Hinogami, Yuka Yamada, Momoko Deura, Kazuhiro Ohkawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


We have constructed a system that uses solar energy to react CO2 with water to generate formic acid (HCOOH) at an energy conversion efficiency of 0.15%. It consists of an AlGaN/GaN anode photoelectrode and indium (In) cathode that are electrically connected outside of the reactor cell. High energy conversion efficiency is realized due to a high quantum efficiency of 28% at 300 nm, attributable to efficient electron-hole separation in the semiconductor's heterostructure. The efficiency is close to that of natural photosynthesis in plants, and what is more, the reaction product (HCOOH) can be used as a renewable energy source.

Original languageEnglish (US)
Article number042160
JournalAIP Advances
Issue number4
StatePublished - Dec 1 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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