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

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


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
Article number042160
JournalAIP Advances
Issue number4
Publication statusPublished - 2012 Dec

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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