Highly Efficient Water Oxidation Photoanode Made of Surface Modified LaTiO2N Particles

Seiji Akiyama, Mamiko Nakabayashi, Naoya Shibata, Tsutomu Minegishi, Yusuke Asakura, Md Abdulla-Al-Mamun, Takashi Hisatomi, Hiroshi Nishiyama, Masao Katayama, Taro Yamada, Kazunari Domen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


An improved variation of highly active/durable O2-evolving LaTiO2N powder-based photoelectrode has been fabricated by pre-cleaning the powder with mild polysulfonic acid and by homogeneous deposition of CoOx co-catalyst aided by microwave annealing. The treatment in aqueous solution of poly(4-styrene sulfonic acid) results in removal of surface LaTiO2N layers, forming fine pores in the crystallites. The CoOx co-catalyst by microwave deposition in Co(NH3)6Cl3/ethylene glycol homogeneously covers the particle surface. The LaTiO2N powder is fabricated into particle-transferred electrodes on Ti thin film supported on solid substrate. The modified LaTiO2N grains on the electrode serve as a highly active O2-evolving photoanode achieving 8.9 mA cm−2 of the photocurrent density at 1.23 V versus reversible hydrogen electrode (RHE) in 0.1 m NaOH (pH 13) under solar-simulator irradiation Airmass 1.5 Global (AM 1.5G). The activity has been much improved, compared with conventional LaTiO2N treated in mineral acid or with CoOx deposited by impregnation. The new electrode also exhibits better durability in fixed-potential chronoamperometric tests under AM 1.5G irradiation.

Original languageEnglish
Pages (from-to)5468-5476
Number of pages9
Issue number39
Publication statusPublished - 2016 Oct 19
Externally publishedYes


  • microwave assisted deposition
  • photoelectrochemical water splitting
  • photoelectrodes
  • poly(4-styrenesulfonic acid)
  • surface reforming

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)


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