Multifunctional silicene/CeO2 heterojunctions: desirable electronic material and promising water-splitting photocatalyst

Multifunctional silicene/CeO2 heterojunctions: desirable electronic material and promising water-splitting photocatalyst
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多功能硅烯/CeO2异质结:理想的电子材料和有前景的水分解光催化剂

DOI:
10.1016/j.cclet.2021.11.026
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发表时间:
2021-11
影响因子:
9.1
通讯作者:
Wang Ling-Ling
Wang Ling-Ling
中科院分区:
化学1区
文献类型:
--
作者:
Xu Liang;Zeng Jian;Li Quan;Luo Xin;Chen Tong;Liu Jingjing;Wang Ling-Ling

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第一性原理计算表明,由于SiO2/CeO 2异质结的堆积方式不同,共价键结(cb)异质结和货车范德华(vdW)异质结可以共存.特别是,cb异质结的带隙为1.97 eV,形成II型异质结,具有良好的氧化还原性能和高效的光吸收光谱,是一种很有前途的全水分解光催化剂。此外,在vdW异质结中,SiO2的Dirac锥在CeO 2半导体衬底上保持良好,禁带宽度为0.43 eV,是一种理想的SiO2基电子器件材料.这些结果可能为硅烯/CeO 2纳米复合材料的纳米电子器件和能量转换开辟新的途径。
The first-principles calculations demonstrate that covalently bonded (cb) heterojunction and van der Waals (vdW) heterojunction can coexist in silicene/CeO2heterojunctions, due to the different stacking patterns. Especially, the cb heterojunction with band gap of 1.97 eV, forms a type-II heterojunction, exhibits good redox performance and has high-effective optical absorption spectra, thus it is a promising photocatalyst for overall water splitting. Besides, for the vdW heterojunction, the Dirac cone of silicene is well kept on CeO2semiconducting substrate, with a considerable energy gap of 0.43 eV, which can be an ideal material in building silicene-based electronic device. These results may open a new gateway in both of nanoelectronic device and energy conversion for silicene/CeO2nanocomposites.
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发表时间: 2005-10
期刊: physica status solidi (b)
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