Premium
Cobalt–Nickel Layered Double Hydroxides Modified on TiO 2 Nanotube Arrays for Highly Efficient and Stable PEC Water Splitting
Author(s) -
Chen Weijian,
Wang Taotao,
Xue Jiawei,
Li Shikuo,
Wang Zidan,
Sun Song
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201602420
Subject(s) - photocurrent , water splitting , materials science , nickel , layered double hydroxides , electrolyte , chemical engineering , nanotube , cobalt , electrode , nanotechnology , template , photocatalysis , catalysis , optoelectronics , chemistry , hydroxide , carbon nanotube , metallurgy , biochemistry , engineering
TiO 2 ‐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 TiO 2 @CoNi‐layered double hydroxides nanotube arrays (TiO 2 @CoNi‐LDHs NTAs) are reported. The typical TiO 2 @CoNi‐LDHs NTAs exhibits enhancing photocurrent density of 4.4 mA cm −2 at 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 TiO 2 sample. Moreover, this hierarchical electrode displays excellent stability against photocorrosion with initial activity loss no more than 1.0% even after 10 h irradiation in Na 2 SO 4 electrolyte solution (pH 6.8), much competitive to those reported TiO 2 ‐based photoelectrodes. This work may offer a combinatorial synthesis strategy for the preparation of hierarchical architectures with high PEC performances.