首页|NH4Cl-assisted synthesis of TaON nanoparticle applied to photocatalytic hydrogen and oxygen evolution from water

NH4Cl-assisted synthesis of TaON nanoparticle applied to photocatalytic hydrogen and oxygen evolution from water

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Oxynitride semiconductors are promising photocatalyst materials for visible light-driven water splitting,while the synthesis of well crystalized oxynitride still remains challenge.In present work,narrow-bandgap TaON nanoparticles are synthesized via heating a vacuum-sealed mixture of KTaO3,Ta and NH4Cl.This method possesses multiple advantages in terms of lower calcination parameter,higher N conversion efficiency and superior photocatalytic activity in comparison with the traditional thermal ammonolysis using NH3 gas as a nitrogen source.Through the analysis of intermediates produced upon the elevation of heating temperature,a gas-solid-phase reaction between TaCl5 and Ta2O5 is demon-strated as the final step,which is conducive to decreasing thermal energy barrier and accelerating nitri-dation process.Precise control of preparation conditions,including calcination temperature and duration,allows for the regulation of surface O/N ratio of TaON particles to unity,resulting in optimized photocat-alytic activity.Photoelectrochemical assessment and intensity modulated photocurrent spectroscopy provide convincing evidence for improved charge transfer efficiency of photoexcited holes at TaON sur-face.A Z-scheme overall water splitting is accomplished by employing the TaON as an effective oxygen evolution photocatalyst,SrTiO3:Rh as a hydrogen evolution photocatalyst,and reduced graphene oxide(rGO)as a solid-state electron mediator.This work presents a promising strategy for the synthesis of high-quality oxynitride materials in application to photocatalytic water splitting.

TaONOxynitride synthesisPhotocatalystWater splitting,HydrogenZ-scheme

Yao Xu、Kaiwei Liu、Jifang Zhang、Boyang Zhang、Jiaming Zhang、Ke Shi、Haifeng Wang、Guijun Ma

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School of Physical Science and Technology,Shanghaitech University,Shanghai 201210,China

Starting Foundation of ShanghaiTech UniversityDouble First-Class Initiative Fund of ShanghaiTech UniversityNational Natural Science Foundation of China

21972092

2024

10.1016/j.jechem.2024.02.051

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.94(7)