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Switched Photocurrent on Tin Sulfide‐Based Nanoplate Photoelectrodes
Author(s) -
Chen Hongjun,
Lyu Miaoqiang,
Zhang Meng,
Feron Krishna,
Searles Debra J.,
Dargusch Matthew,
Yao Xiangdong,
Wang Lianzhou
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201601603
Subject(s) - photocurrent , calcination , materials science , tin , anode , cathodic protection , water splitting , chemical engineering , nanotechnology , photocatalysis , optoelectronics , chemistry , catalysis , electrode , metallurgy , biochemistry , engineering
Abstract A new type of SnS 2 nanoplate photoelectrode is prepared by using a mild wet‐chemical method. Depending on the calcination temperatures, SnS 2 ‐based photoelectrodes can either retain their n‐type nature with greatly enhanced anodic photocurrent density (ca. 1.2 mA cm −2 at 0.8 V vs. Ag/AgCl) or be completely converted into p‐type SnS to generate approximately 0.26 mA cm −2 cathodic photocurrent density at −0.8 V vs. Ag/AgCl. The dominance of sulfur and tin vacancies are found to account for the dramatically different photoelectrochemical behaviors of n‐type SnS 2 and p‐type SnS photoelectrodes. In addition, the band structures of n‐type SnS 2 and p‐type SnS photoelectrodes are also deduced, which may provide an effective strategy for developing SnS 2 /SnS films with controllable energy‐band levels through a simple calcination treatment.