Details

Autor(en) / Beteiligte

• Chen, Weijian
• Wang, Taotao
• Xue, Jiawei
• Li, Shikuo
• Wang, Zidan
• Sun, Song

Titel

Cobalt–Nickel Layered Double Hydroxides Modified on TiO2 Nanotube Arrays for Highly Efficient and Stable PEC Water Splitting

Ist Teil von

• Small (Weinheim an der Bergstrasse, Germany), 2017-03, Vol.13 (10), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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−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 TiO2 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 Na2SO4 electrolyte 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. The well‐aligned hierarchical TiO2@CoNi‐layered double hydroxides nanotube arrays prepared by an anodization and electrodeposition combinatorial strategy exhibit high activity and superior long‐term stability for photoelectrochemical water splitting. It yields an anodic photocurrent of 4.4 mA cm−2 at 1.23 V versus reversible hydrogen electrode, 3.3 times higher than that of pristine TiO2, and displays activity loss less than 1.0% after illumination for 10 h.