Cobalt–Nickel Layered Double Hydroxides Modified on TiO2 Nanotube Arrays for Highly Efficient and Stable PEC Water Splitting |
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| Authors: | Weijian Chen Taotao Wang Jiawei Xue Shikuo Li Zidan Wang Song Sun |
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| Affiliation: | 1. Lab of Clean Energy & Environmental Catalysis, School of Chemistry and Chemical Engineering, Anhui University, Hefei, China;2. National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui, China |
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| 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?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. |
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| Keywords: | layered double hydroxides long‐term stability PEC water splitting photoconversion efficiency TiO2 nanotubes |
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