Revisiting the Chemical Stability of Germanium Selenide (GeSe) and the Origin of its Photocatalytic Efficiency

Boukhvalov Danil W.; Nappini Silvia; Vorokhta MykhailoMentes Tevfik OnurPiliai LesiaPanahi MohammadGenuzio FrancescaDe Santis JessicaKuo Chia-NungLue Chin ShanPaolucci ValentinaLocatelli AndreaBondino FedericaPolitano Antonio

首页> 外文期刊>Advanced functional materials >Revisiting the Chemical Stability of Germanium Selenide (GeSe) and the Origin of its Photocatalytic Efficiency

【24h】

Revisiting the Chemical Stability of Germanium Selenide (GeSe) and the Origin of its Photocatalytic Efficiency

机译：Revisiting the Chemical Stability of Germanium Selenide (GeSe) and the Origin of its Photocatalytic Efficiency

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

Recently, germanium selenide (GeSe) has emerged as a promising van der Waals semiconductor for photovoltaics, solar light harvesting, and water photoelectrolysis cells. Contrary to previous reports claiming perfect ambient stability based on experiments with techniques without surface sensitivity, here, by means of surface-science investigations and density functional theory, it is demonstrated that actually both: i) the surface of bulk crystals; and ii) atomically thin flakes of GeSe are prone to oxidation, with the formation of self-assembled germanium-oxide skin with sub-nanometric thickness. Surface oxidation leads to the decrease of the bandgap of stoichiometric GeSe and GeSe1-x, while bandgap energy increases upon surface oxidation of Ge1-xSe. Remarkably, the formation of a surface oxide skin on GeSe crystals plays a key role in the physicochemical mechanisms ruling photoelectrocatalysis: the underlying van der Waals semiconductor provides electron-hole pairs, while the germanium-oxide skin formed upon oxidation affords the active sites for catalytic reactions. The self-assembled germanium-oxide/germanium-selenide heterostructure with different bandgaps enables the activation of photocatalytic processes by absorption of light of different wavelengths, with inherently superior activity. Finally, it is discovered that, depending on the specific solvent-GeSe interaction, the liquid phase exfoliation of bulk crystals can induce the formation of Se nanowires.

著录项

来源
《Advanced functional materials》 |2021年第50期|2106228.1-2106228.13|共13页
作者
Boukhvalov Danil W.; Nappini Silvia; Vorokhta MykhailoMentes Tevfik OnurPiliai LesiaPanahi MohammadGenuzio FrancescaDe Santis JessicaKuo Chia-NungLue Chin ShanPaolucci ValentinaLocatelli AndreaBondino FedericaPolitano Antonio;
展开▼
作者单位

Nanjing Forestry Univ, Inst Mat Phys & Chem, Coll Sci, Nanjing 210037, Peoples R China|Ural Fed Univ, Inst Phys & Technol, Mira St 19, Ekaterinburg 620002, Russia;

CNR, Ist Officina Mat IOM, Lab TASC, Area Sci Pk SS 14 Km 163-5, I-34149 Trieste, Italy;

Charles Univ Prague, Holesovickach 2, Prague 18000 8, Czech RepublicElettra Sincrotrone SCpA, SS 14 Km 163-5 AREA Sci Pk, I-34149 Trieste, ItalyUniv Aquila, Dept Ind & Informat Engn & Econ, Via G Gronchi 18,7, I-67100 Laquila, ItalyNatl Cheng Kung Univ, Dept Phys, 1 Ta Hsueh Rd, Tainan 70101, TaiwanUniv Aquila, INSTM, Via Vetoio, I-67100 Laquila, Italy|Univ Aquila, Dept Phys & Chem Sci, Via Vetoio, I-67100 Laquila, Italy|CNR IMM Ist Microelettron & Microsistemi, 8 Str 5, I-95121 Catania, Italy;

展开▼
收录信息
原文格式 PDF
正文语种英语
中图分类
关键词
2D materials; density functional theory calculations; catalysis; germanium selenide; surface science;

Revisiting the Chemical Stability of Germanium Selenide (GeSe) and the Origin of its Photocatalytic Efficiency

摘要

著录项

相关主题

期刊订阅