title: A Titanium-Doped SiOx Passivation Layer for Greatly Enhanced Performance of a Hematite-Based Photoelectrochemical System.
abstract: This study introduces an in situ fabrication of nanoporous hematite with a Ti-doped SiOx passivation layer for a high-performance water-splitting system. The nanoporous hematite with a Ti-doped SiOx layer (Ti-(SiOx /np-Fe2 O3 )) has a photocurrent density of 2.44 mA cm(-2) at 1.23 VRHE and 3.70 mA cm(-2) at 1.50 VRHE . When a cobalt phosphate co-catalyst was applied to Ti-(SiOx /np-Fe2 O3 ), the photocurrent density reached 3.19 mA cm(-2) at 1.23 VRHE with stability, which shows great potential of the use of the Ti-doped SiOx layer with a synergistic effect of decreased charge recombination, the increased number of active sites, and the reduced hole-diffusion pathway from the hematite to the electrolyte.
authors.affiliation: Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919, Republic of Korea.|School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919, Republic of Korea.
authors.forename: Hyo-Jin
authors.initials: HJ
authors.lastname: Ahn
authors.affiliation: Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919, Republic of Korea.|School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919, Republic of Korea.
authors.forename: Ki-Yong
authors.initials: KY
authors.lastname: Yoon
authors.affiliation: Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919, Republic of Korea.|School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919, Republic of Korea.
authors.forename: Myung-Jun
authors.initials: MJ
authors.lastname: Kwak
authors.affiliation: Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919, Republic of Korea. clau@unist.ac.kr.|School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919, Republic of Korea. clau@unist.ac.kr.
authors.forename: Ji-Hyun
authors.initials: JH
authors.lastname: Jang
keywords: conductive SiOx layers; hematite; nanoporous structures; passivation layers; photoelectrochemical cells