Enhanced charge transfer and separation of hierarchical hydrogenated TiO2 nanothorns/carbon nanofibers composites decorated by NiS quantum dots for remarkable photocatalytic H-2 production activity

Zhang Xin; Chen Yajie; Xiao YutingZhou WeiTian GuohuiFu Honggang

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Enhanced charge transfer and separation of hierarchical hydrogenated TiO2 nanothorns/carbon nanofibers composites decorated by NiS quantum dots for remarkable photocatalytic H-2 production activity

机译：增强电荷转移和分离分层氢化二氧化钛nanothorns /碳通过NiS量子纳米纤维复合材料装饰点非凡的光催化氢生产活动

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Hierarchical core/shell hydrogenated TiO2 (H-TiO2) nanothorns/carbon nanofibers (CNFs) composites were produced through a solvothermal method, followed by ordinal calcination and hydrogenation treatments using the prepared carbon nanofiber as electron-transporting substrate material. The hierarchical H-TiO2/CNFs composites possess more exposed surface active sites and offer efficient charge transport paths. NiS quantum dots as excellent electron acceptors and cocatalysts were anchored on the hierarchical H-TiO2/CNFs composites by a wet chemical deposition method. The synergistic effects of the surface defects (oxygen vacancies), NiS cocatalyst, and carbon nanofibers greatly improve charge transfer and separation, increase the accessible surface area and surface donor density of the composites and also extend the photoresponse from the ultraviolet to the visible light region. By taking advantage of these features and because of its unique architecture, the optimal NiS quantum dots-decorated H-TiO2/CNFs composite exhibited a remarkable solar-driven hydrogen generation rate (75.92 mu mol h(-1), 30 mg(-1)) in the absence of a Pt cocatalyst under AM 1.5 irradiation, which is about 12.3 times that of TiO2/CNFs nanostructures.

机译：分层的核/壳氢化二氧化钛(H-TiO2)纳米碳纤维/ nanothorns (cnf)复合材料通过solvothermal生产方法,其次是序数煅烧和加氢治疗使用制备碳纳米纤维电子传输衬底材料。分层H-TiO2 / cnf复合材料拥有更多暴露表面活性的网站和提供高效电荷传输路径。优秀的电子受体和:固定在分层H-TiO2 / cnf复合材料的湿化学沉积方法。表面缺陷的协同效应(氧气空位)、NiS助催化剂和碳纳米纤维大大提高电荷转移分离,增加表面积和捐赠复合材料的密度和表面也扩展的光敏反应紫外可见光区域。利用这些功能,因为其独特的建筑,最优NiS量子dots-decorated H-TiO2 / cnf复合展出引人注目的太阳能氢产生率(75.92亩摩尔h(1), 30毫克(1))在缺乏Pt助催化剂在上午1.5辐照,是关于二氧化钛的12.3倍/ cnf吗nanostructures。

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来源
《Nanoscale》 |2018年第8期|4041-4050|共10页
作者
Zhang Xin; Chen Yajie; Xiao YutingZhou WeiTian GuohuiFu Honggang;
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作者单位

Heilongjiang Univ, Sch Chem & Mat Sci, Minist Educ Peoples Republ China, Key Lab Funct Inorgan Mat Chem, Harbin 150080, Heilongjiang, Peoples R China;

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正文语种英语
中图分类分子物理学、原子物理学;
关键词
charge transfer; INTERSTITIAL HYDROGEN GENERATION; HierarchicalQuantum dotsCarbon nanofibersCompositesNanofibressurface areaVisible Lightsubstrate materialseparationElectron acceptors;

机译：电荷转移;间质氢代;HierarchicalQuantum dotsCarbonnanofibersCompositesNanofibressurface areaVisibleLightsubstrate materialseparationElectron受体;

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Enhanced charge transfer and separation of hierarchical hydrogenated TiO2 nanothorns/carbon nanofibers composites decorated by NiS quantum dots for remarkable photocatalytic H-2 production activity

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