AgInS2 and graphene co-sensitized TiO2 photoanodes for photocathodic protection of Q235 carbon steel under visible light

Hong Li; Weizhe Song; Xingqiang Cui; Yanhui Li; Baorong Hou; Xiaoping Zhang; Yuqi Wang; Lianjun Cheng; Pengfei Zhang; Junru Li

doi:10.1088/1361-6528/ab85eb

AgInS₂ and graphene co-sensitized TiO₂ photoanodes for photocathodic protection of Q235 carbon steel under visible light

Nanotechnology. 2020 Jul 24;31(30):305704. doi: 10.1088/1361-6528/ab85eb. Epub 2020 Apr 2.

Authors

Hong Li¹, Weizhe Song, Xingqiang Cui, Yanhui Li, Baorong Hou, Xiaoping Zhang, Yuqi Wang, Lianjun Cheng, Pengfei Zhang, Junru Li

Affiliation

¹ State Key Laboratory of Bio-fibers and Eco-textiles, College of Mechanical and Electrical Engineering, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, People's Republic of China.

PMID: 32240986
DOI: 10.1088/1361-6528/ab85eb

Abstract

AgInS₂ nanoparticle and graphene nanosheet co-sensitized anatase TiO₂ nanotube array films were fabricated by a combination of hydrothermal reaction and electrochemical anodization on titanium sheets. The results showed that the co-sensitization of AgInS₂ nanoparticles and graphene nanosheets extended the photoresponse of TiO₂ nanotubes into the visible-light region, and improved the photogenerated charge separation and transfer capability. The photocurrent density of the AgInS₂/graphene/TiO₂ composites (about 4.0 mA cm^-2) was 20 times that of bare TiO₂ (only 0.2 mA cm^-2) under visible-light illumination. The potential negative shift value of AgInS₂/graphene/TiO₂ composites was up to 0.68 V versus saturated calomel electrode. The AgInS₂/graphene/TiO₂ composites can provide Q235 carbon steel with highly efficient photocathodic protection under visible-light illumination.