title: Cobalt-Nickel Layered Double Hydroxides Modified on TiO2Nanotube Arrays for Highly Efficient and Stable PEC Water Splitting.
abstract: TiO2-based photoanodes have attracted extensive attention worldwide for photoelectrochemical (PEC) water splitting, but these materials still suffer from poor electron-hole separation and low photoconversion efficiency. Here, the high PEC water splitting activity and long-term stability against photocorrosion of well-aligned hierarchical TiO2@CoNi-layered double hydroxides nanotube arrays (TiO2@CoNi-LDHs NTAs) are reported. The typical TiO2@CoNi-LDHs NTAs exhibits enhancing photocurrent density of 4.4 mA cm-2at a potential of 1.23 V (vs reversible hydrogen electrode) under AM 1.5G simulated sunlight (100 mW cm-2), 3.3 times higher than that of the pristine TiO2sample. Moreover, this hierarchical electrode displays excellent stability against photocorrosion with initial activity loss no more than 1.0% even after 10 h irradiation in Na2SO4electrolyte solution (pH 6.8), much competitive to those reported TiO2-based photoelectrodes. This work may offer a combinatorial synthesis strategy for the preparation of hierarchical architectures with high PEC performances.
authors.affiliation: Lab of Clean Energy & Environmental Catalysis, School of Chemistry and Chemical Engineering, Anhui University, Hefei, 230601, China.
authors.forename: Weijian
authors.initials: W
authors.lastname: Chen
authors.affiliation: Lab of Clean Energy & Environmental Catalysis, School of Chemistry and Chemical Engineering, Anhui University, Hefei, 230601, China.
authors.forename: Taotao
authors.initials: T
authors.lastname: Wang
authors.affiliation: National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui, 230029, China.
authors.forename: Jiawei
authors.initials: J
authors.lastname: Xue
authors.affiliation: Lab of Clean Energy & Environmental Catalysis, School of Chemistry and Chemical Engineering, Anhui University, Hefei, 230601, China.
authors.forename: Shikuo
authors.initials: S
authors.lastname: Li
authors.affiliation: Lab of Clean Energy & Environmental Catalysis, School of Chemistry and Chemical Engineering, Anhui University, Hefei, 230601, China.
authors.forename: Zidan
authors.initials: Z
authors.lastname: Wang
authors.affiliation: National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui, 230029, China.
authors.forename: Song
authors.initials: S
authors.lastname: Sun
keywords: PEC water splitting; TiO2 nanotubes; layered double hydroxides; long-term stability; photoconversion efficiency