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Enhanced Photocatalytic Activity by the Combined Influence of Ferroelectric Domain and Au Nanoparticles for BaTiO <sub/>3</sub> Fibers
摘要： Ferroelectric particles have been applied in the photocatalytic field because the spontaneous polarization results in the internal electric field, which can accelerate the separation and migration of photogenerated carriers. In this study, the BaTiO3 (BT) fibers are synthesized by electrospinning. The BT fibers calcined above 800 °C exhibit a strong ferroelectric property, which is verified by a typical butterfly-shaped displacement-voltage loop. It is found that the BT fibers with the single-domain structure exhibit better photocatalytic performance than that with the multi-domain configuration. When the single-domain transforms into multi-domain, the integrated internal electric field correspondingly breaks up, inducing that the internal electric field might cancel each other out and diminish the separation of photogenerated carriers. Also, the Au nanoparticles can improve the photocatalytic activity further on account of the surface plasmon resonance. Therefore, it is suggested that Au nanoparticles decorated on ferroelectric BT nanomaterials are promising photocatalysts.
关键词： photocatalytic performance,Ferroelectric property,domain configuration,internal electric field
更新于2025-09-23 15:23:52
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N multiple quantum dot solar cells
摘要： In this work, we investigate the influence of the internal electric field induced by the polarization inside the active region of the p-i-n photodiode on the characteristics of InN/InGaN quantum dots intermediate band solar cell. Considering the conduction and valence band offsets, the electron and hole energy levels have been determined by solving analytically the corresponding Schr?dinger equations. The hole level, usually neglected in similar studies, is taken into account to determine all the intermediate transitions. All parameters of multiple quantum dot solar cells such as open-circuit voltage, short-circuit current density and photovoltaic conversion efficiency are determined as functions of the indium content, the internal electric field, inter-dot distances and dot sizes. Our calculations show that determining the photovoltaic conversion efficiency (η) without taking into account the internal electric field leads to an overestimation of η.
关键词： Temperature effect,Intermediate level,Internal electric field,Solar cell,Photovoltaic conversion efficiency
更新于2025-09-23 15:19:57
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Visible-light-responsive bismuth oxybromide/graphite-like C3N4 hybrid material and its application in photocatalysis via internal electric field
摘要： In this work, we propose a facile route to obtain BiOBr/ graphite-like C3N4 hybrid material, which was constructed by in situ depositing BiOBr onto the surface of g-C3N4 as a template via self-assembly procedure at room temperature. This method describes the use of g-C3N4/BiOBr nanocomposite for the superior photocatalytic performances under visible light excitation (λ > 420 nm). The crystalline phase, morphology, textile structure and components of the samples were studied by several tools such as X-ray diffraction, transmission electron microscopy, N2 adsorption–desorption, energy dispersive X-ray spectrum, Fourier transform infrared spectroscopy and Raman spectroscopy. The optical, photoelectrochemical properties and band structure were measured by ultraviolet–visible diffuse reflectance spectroscopy, steady-state photoluminescence spectra, photocurrent response analysis, electrochemical impedance spectra and valence-band X-ray photoelectron spectroscopy techniques, respectively. In addition, the catalytic activities of the hetero-structural material were broadly investigated and compared with single BiOBr or g-C3N4 alone in the same reaction. The as-obtained BiOBr/g-C3N4 composite showed distinctive advantages over BiOBr alone and universality for various substrate, i.e., dichloronaphthol degradation and reduction efficiency of Cr (VI) over BiOBr/g-C3N4 was increased by up to 3 and 2.5 times, respectively. The enhanced photocatalytic activity of the as-prepared BiOBr/g-C3N4 complex was mainly contributed to the effective charge transfer, which can further cause the establishment of the internal electric field in the interface between BiOBr and g-C3N4 to boost the space charge separation. This work gives a new route for designing high efficient semiconductor hybrid photocatalyst with broad absorption region as well as quick charge separation.
关键词： Graphite-like C3N4,BiOBr,Self-assembly,Photoelectrochemical,Internal electric field
更新于2025-09-04 15:30:14