Jump to main content
Jump to site search


Switchable synthesis of p- and n-type Cu-In-S grooved pyramid-like microcrystals for unassisted photoelectrochemical water splitting

Abstract

Herein, p- and n-type switchable Cu-In-S microcrystals with grooved pyramid-like morphology are facilely synthesized by transforming binary In2S3. A cation exchange and in-situ growth mechanism is proposed to illustrate the generation of grooved pyramid-like Cu-In-S samples. It is demonstrated that the structure, composition, and semiconducting property of Cu-In-S films could be controlled by maneuvering the rate of cation exchange, which can be simply adjusted by varying the amount of sulfur precursor. With the increased amount of added thiourea, p-type CuInS2, n-type CuIn5S8, as well as the mixture of CuInS2 and CuIn5S8 are prepared. The p-type CuInS2 and n-type CuIn5S8 photoelectrodes respectively exhibit a cathodic photocurrent of -0.18 mA·cm-2 at -0.4 V vs. RHE and an anodic photocurrent of 0.61 mA·cm-2 at 0.7 V vs. RHE in 0.1 M Na2SO4 solution (pH=3) under AM 1.5G illumination. More importantly, an unassisted water splitting system using parallel mode composed of CoOx/CuIn5S8 photoanode and Pt/CuInS2 photocathode is constructed, which shows a photocurrent density of 0.015 mA·cm-2. The present work could provide a new idea for constructing efficient unassisted photoelectrochemical water splitting devices using copper-based chalcogenides. Meanwhile, the capability to switch p-n semiconducting properties has a great inspiration to enable the development of novel semiconductor materials for photoelectric applications.

Back to tab navigation

Supplementary files

Publication details

The article was received on 14 Mar 2018, accepted on 12 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA02386G
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
  •   Request permissions

    Switchable synthesis of p- and n-type Cu-In-S grooved pyramid-like microcrystals for unassisted photoelectrochemical water splitting

    X. Feng, R. Li, M. Wang and Y. Chen, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02386G

Search articles by author

Spotlight

Advertisements