Photoelectrochemical hydrogen evolution from water using copper gallium selenide electrodes prepared by a particle transfer method

Hiromu Kumagai, Tsutomu Minegishi, Yosuke Moriya, Jun Kubota, Kazunari Domen

研究成果: Article査読

76 被引用数 (Scopus)

抄録

Photocathodes prepared using p-type semiconductor photocatalyst powders of copper gallium selenides (CGSe) were investigated for visible-light-driven photoelectrochemical water splitting. The CGSe powders were prepared by solid-state reaction of selenide precursors with various Ga/Cu ratios. The CGSe photoelectrodes prepared by the particle transfer method showed cathodic photocurrent in an alkaline electrolyte. Pt modification was conducted for all the photoelectrodes by photoassisted electrodeposition. CGSe particles with a Ga/Cu ratio of 2, consisting of the CuGa3Se5 phase and an intermediate phase between CuGaSe2 and CuGa3Se 5, yielded the largest cathodic photocurrent. By surface modification with a CdS semiconductor layer, the photocurrent density and onset potential clearly increased, indicating enhancement of charge separation caused by the formed p-n junction with appropriate band alignment at solid-liquid interfaces. A multilayer structure on the particles was confirmed to be beneficial for enhancing the photocurrent, as in the case of thin-film photoelectrodes. A Pt/CdS/CGSe electrode (Ga/Cu = 2) was demonstrated to work as a photocathode contributing stoichiometric hydrogen evolution from water for 16 h under visible light irradiation.

本文言語English
ページ(範囲)16386-16392
ページ数7
ジャーナルJournal of Physical Chemistry C
118
30
DOI
出版ステータスPublished - 2014 7月 31
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

フィンガープリント

「Photoelectrochemical hydrogen evolution from water using copper gallium selenide electrodes prepared by a particle transfer method」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル