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arXiv 2207.06232cond-mat.mtrl-sci
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$g-B_{3}C_{2}N_{3}$:一种新型的二维无金属光催化剂

$g-B_{3}C_{2}N_{3}$: A new potential two dimensional metal-free photocatalyst for overall water splitting

Sreejani Karmakar, Souren Adhikary, Sudipta Dutta

摘要:

本论文采用混合密度泛函理论(DFT)方法,提出了一种具有无金属掺杂前景的新型二维B-C-N材料$g-B_{3}C_{2}N_{3}$。一个全面的研究表明,它是一个近紫外(UV)吸收直接带隙(3.69 eV)的半导体具有强大的动力学和机械稳定性。相对于水的氧化和氢还原电位水平的能带位置估计,我们观察到,$g-B_{3}C_{2}N_{3}$单层显示的可能性被用于通过自发的太阳能水分裂的氢燃料发电,在一个广泛的pH值范围。在双轴应变应用的带隙随着拉伸应变的增加而减小,导致随后的吸收光谱的红移,这意味着在太阳照射下增强的光子收获。此外,由于带隙和功函数变化的组合效应,双轴应变重新排列能带位置,允许根据要求控制还原或氧化能力,以实现环境可持续性。

英文摘要:

In this work, using a hybrid density functional theory (DFT) based calculation, we propose a new two-dimensional (2D) B-C-N material, $g-B_{3}C_{2}N_{3}$, with the promising prospect of metal-free photocatalysis. A comprehensive investigation demonstrates that it is a near ultraviolet (UV) absorbing direct band gap (3.69 eV) semiconductor with robust dynamical and mechanical stability. Estimating the band positions with respect to water oxidation and hydrogen reduction potential levels, we observe that $g-B_{3}C_{2}N_{3}$ monolayer shows the possibility to be used for hydrogen fuel generation through spontaneous solar water splitting, over a broad pH range. Upon biaxial strain application the band gap decreases with increase in tensile strain, leading to a subsequent red shift in absorption spectra, implying enhanced photon harvest under solar irradiation. Furthermore, due to a combined effect of band gap and work function variation, biaxial strain realigns the band positions, allowing one to control the reducing or oxidizing ability as per requirement to attain environmental sustainability.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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