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The construction of a dual direct Z-scheme NiAl LDH/g-CN/AgPO nanocomposite for enhanced photocatalytic oxygen and hydrogen evolution. | LitMetric

AI Article Synopsis

Article Abstract

Dual direct Z-scheme photocatalysts for overall water decomposition have demonstrated strong redox abilities and the efficient separation of photogenerated electron-hole pairs. Overall water splitting utilizing NiAl-LDH-based binary and ternary nanocomposites has been extensively investigated. The synthesized binary and ternary nanocomposites were characterized XRD, FTIR, SEM, HRTEM, XPS, UV-DRS, and photoelectrochemical measurements. The surface wettability properties of the prepared nanocomposites were measured contact angle measurements. The application of the NiAl-LDH/g-CN/AgPO ternary nanocomposite was investigated for photocatalytic overall water splitting under light irradiation. In this work, we found that in the presence of AgPO, the evolution of H and O is high over LCN30, and 2.8- fold (O) and 1.4-fold (H) activity increases can be obtained compared with the use of LCN30 alone. It is proposed that AgPO is involved in the O evolution reaction during water oxidation and g-CN is involved in overall water splitting. Our work not only reports overall water splitting using NiAl-LDH-based nanocomposites but it also provides experimental evidence for understanding the possible reaction process and the mechanism of photocatalytic water splitting. Photoelectrochemical measurements confirmed the better H and O evolution abilities of NiAl-LDH/g-CN/AgPO in comparison with NiAl LDH, g-CN, AgPO, and LCN30. The observed improvement in the gas evolution properties of NiAl LDH in the presence of AgPO is due to the formation of a dual direct Z-scheme, which allows for the easier and faster separation of charge carriers. More importantly, the LCNAP5 heterostructure shows high levels of H and O evolution, which are significantly enhanced compared with LCN30 and pure NiAl LDH.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9418587PMC
http://dx.doi.org/10.1039/d0na01074jDOI Listing

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