CuInS2/Sb2S3 heterostructure modified with noble metal co-catalyst for efficient photoelectrochemical water splitting

• Published in: Journal of alloys and compounds Vol. 795; pp. 319 - 326
• Main Authors: Cai, Qijun, Liu, Zhifeng, Han, Changcun, Tong, Zhengfu, Ma, Chonghao
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 30.07.2019; Elsevier BV
• Subjects: Catalysis; Catalysts; Chemical synthesis; Co-catalyst; CuInS2; Heterostructure; Heterostructures; Noble metals; Photocathodes; Photoelctrochemical water splitting; Photoelectric effect; Photoelectric emission; Sb2S3; Separation; Substrates; Water splitting; Heterostructure; Sb2S3; Co-catalyst; CuInS2; Photoelctrochemical water splitting
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.04.312

In order to improve the water splitting efficiency of CuInS2 in a photoelectrochemical (PEC) cell, the novel CuInS2/Sb2S3 heterostructure photocathodes modified with Pt noble metal co-catalyst were prepared on the ITO substrate by the hydrothermal and electrochemical deposition method for the first time. The mechanism of the synthesis reaction for the CuInS2/Sb2S3 and CuInS2/Sb2S3/Pt were investigated. With the photoelectrochemical measurements, the photocurrent density of CuInS2/Sb2S3/Pt photoelectrode (−2.48 mA/cm2 at −0.6 V vs. RHE) is about 3.13 times relatively higher than that of the corresponding the pure CuInS2 photoelectrode (−0.79 mA/cm2 at −0.6 V vs. RHE). The excellent PEC behaviors profit from the modification by Sb2S3 that forms the heterostructure which broadens the response of visible light and increases the separation and transfer of photo-generated carriers. Moreover, after introducing Pt co-catalyst onto the surface of CuInS2/Sb2S3 photoelectrode, photo-generated electrons can be captured quickly which further effectively promotes the separation of photo-generated carriers and greatly improve the PEC performance. This work manifests that the structure of CuInS2/Sb2S3/Pt photocathodes has a guiding suggestion to provide a promising approach to designing a highly stabilized efficient device for photoelectrochemical water splitting. [Display omitted] •Fabrication of CuInS2/Sb2S3/Pt photocathode for PEC water splitting.•CuInS2/Sb2S3/Pt prepared by the hydrothermal and electrodeposition method.•Pt acts as an electron capture layer to promote water reduction.•CuInS2 and Sb2S3 heterojunction reducing the charge recombination.