Improvement of hydrogen evolution under visible light over Zn1-2x(CuGa)xGa2S4 photocatalysts by synthesis utilizing a polymerizable complex method

Ciro Scheremeta Quintans, Hideki Kato, Makoto Kobayashi, Hiroshi Kaga, Akihide Iwase, Akihiko Kudo, Masato Kakihana

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Single phase Zn1-2x(CuGa)xGa2S4 was successfully synthesized by a two-step route: synthesis of an oxide precursor by a polymerizable complex (PC) method followed by sulfurization under a H2S-Ar flow. The samples thus obtained were porous aggregates consisting of fine crystals with 50 nm size. Among the examined compositions, Zn0.4(CuGa)0.3Ga2S4 (x = 0.3) showed the highest activity for H2 evolution from an aqueous solution containing S2- and SO32- as electron donors under visible light irradiation. The apparent quantum yield of the optimized sample with deposition of 2 wt% of Rh was 19% at 420 nm. This value is higher than that of the sample synthesized by a solid state reaction (15%). Therefore, improvement of the photocatalytic performance of Zn0.4(CuGa)0.3Ga2S4 for H2 evolution has been achieved by using the two-step synthesis method including the preparation of an oxide precursor by the PC method.

Original languageEnglish
Pages (from-to)14239-14244
Number of pages6
JournalJournal of Materials Chemistry A
Volume3
Issue number27
DOIs
Publication statusPublished - 21 Jul 2015

Fingerprint Dive into the research topics of 'Improvement of hydrogen evolution under visible light over Zn<sub>1-2x</sub>(CuGa)<sub>x</sub>Ga<sub>2</sub>S<sub>4</sub> photocatalysts by synthesis utilizing a polymerizable complex method'. Together they form a unique fingerprint.

  • Cite this