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碳包覆Pd/TiO_(2)光催化产氢协同胺类选择性氧化合成亚胺 被引量:2
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作者 卢尔君 陶俊乾 +4 位作者 阳灿 侯乙东 张金水 王心晨 付贤智 《物理化学学报》 SCIE CAS CSCD 北大核心 2023年第4期37-47,共11页
负载型金属纳米催化剂由于其优异的光催化性能,被广泛应用于光催化产氢协同胺类氧化偶联合成高附加值亚胺体系。但在反应过程中,金属表面对H原子和亚胺表现出较强的吸附能力,导致了亚胺易于发生自氢化反应而生成仲胺,显著降低了亚胺的... 负载型金属纳米催化剂由于其优异的光催化性能,被广泛应用于光催化产氢协同胺类氧化偶联合成高附加值亚胺体系。但在反应过程中,金属表面对H原子和亚胺表现出较强的吸附能力,导致了亚胺易于发生自氢化反应而生成仲胺,显著降低了亚胺的选择性。在本文中,我们证实了在Pd/TiO_(2)表面构建超薄碳层(Pd/TiO_(2)@C)是一种解决上述问题的有效策略。在Pd/TiO_(2)表面构筑的超薄碳层可以有效调控H原子和亚胺在其表面的吸附行为,避免了光催化氧化偶联过程中亚胺的自氢化。因此,Pd/TiO_(2)@C光催化剂在光催化产氢协同胺类选择性氧化合成亚胺体系中展现出优异的亚胺选择性。本研究提供了一种便捷有效的策略推动负载型金属纳米催化剂在光催化产氢协同合成高附加值产物体系中的应用。 展开更多
关键词 光催化 析氢反应 胺氧化偶联 负载型金属催化剂 表面修饰
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Position-selected cocatalyst modification on a Z-scheme Cd_(0.5)Zn_(0.5)S/NiTiO_(3) photocatalyst for boosted H_(2) evolution
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作者 Bifang Li Wenyu Guo +3 位作者 Xue Feng Lu yidong hou Zhengxin Ding Sibo Wang 《Materials Reports(Energy)》 EI 2023年第4期52-59,共8页
Photocatalytic water splitting by semiconductors is a promising technology to produce clean H_(2) fuel,but the efficiency is restrained seriously by the high overpotential of the H_(2)-evolution reaction together with... Photocatalytic water splitting by semiconductors is a promising technology to produce clean H_(2) fuel,but the efficiency is restrained seriously by the high overpotential of the H_(2)-evolution reaction together with the high recombination rate of photoinduced charges.To enhance H_(2) production,it is highly desirable yet challenging to explore an efficient reductive cocatalyst and place it precisely on the right sites of the photocatalyst surface to work the proton reduction reaction exclusively.Herein,the metalloid NixP cocatalyst is exactly positioned on the Z-scheme Cd_(0.5)Zn_(0.5)S/NiTiO_(3)(CZS/NTO)heterostructure through a facile photodeposition strategy,which renders the cocatalyst form solely at the electron-collecting locations.It is revealed that the directional transfer of photoexcited electrons from Cd_(0.5)Zn_(0.5)S to Ni_(x)P suppresses the quenching of charge carriers.Under visible light,the CZS/NTO hybrid loaded with the Ni_(x)P cocatalyst exhibits an optimal H_(2) yield rate of 1103μmol h^(-1)(i.e.,27.57 mmol h^(-1)g^(-1)),which is about twofold of pristine CZS/NTO and comparable to the counterpart deposited with the Pt cocatalyst.Besides,the high apparent quantum yield(AQY)of 56%is reached at 400 nm.Further,the mechanisms of the cocatalyst formation and the H2 generation reaction are discussed in detail. 展开更多
关键词 Photocatalysis Ni_(x)P COCATALYSTS Z-scheme H_(2)evolution
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空心NiCo_(2)S_(4)纳米球助催化剂担载ZnIn_(2)S_(4)纳米片用于可见光催化制氢 被引量:5
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作者 熊壮 侯乙东 +3 位作者 员汝胜 丁正新 王伟俊 汪思波 《物理化学学报》 SCIE CAS CSCD 北大核心 2022年第7期56-65,共10页
纳米片与空心球上之间的合理界面调控是开发高效太阳能制氢光催化剂的潜在策略。在各类光催化材料中,金属硫化物由于具有相对较窄的带隙和优越的可见光响应能力而被广泛研究。ZnIn_(2)S_(4)是一种层状的三元过渡金属半导体光催化剂,其... 纳米片与空心球上之间的合理界面调控是开发高效太阳能制氢光催化剂的潜在策略。在各类光催化材料中,金属硫化物由于具有相对较窄的带隙和优越的可见光响应能力而被广泛研究。ZnIn_(2)S_(4)是一种层状的三元过渡金属半导体光催化剂,其带隙可控(约2.4 eV)。在众多金属硫化物光催化剂中,ZnIn_(2)S_(4)引起了广泛兴趣。然而,单纯的ZnIn_(2)S_(4)光催化活性仍然相对较差,主要是因为光生载流子的复合率较高、迁移速率较慢。在半导体光催化剂上负载助催化剂是提升光催化剂性能的一种有效方法,因为它不仅可以加速光生电子和空穴的分离,而且还可以降低质子还原反应的活化能。作为一种三元过渡金属硫化物,NiCo_(2)S_(4)表现出较高的导电性、较低的电负性、丰富的氧化还原特性以及优越的电催化活性。这些特性表明,NiCo_(2)S_(4)可以作为光催化制氢的助催化剂,以加速电荷分离和转移。此外,NiCo_(2)S_(4)和ZnIn_(2)S_(4)都属于三元尖晶石的晶体结构,这可能有助于构建具有紧密界面接触的NiCo_(2)S_(4)/ZnIn_(2)S_(4)复合物,从而提高光催化性能。本文中,将超薄ZnIn_(2)S_(4)纳米片原位生长到非贵金属助催化剂NiCo_(2)S_(4)空心球上,形成具有强耦合界面和可见光吸收的NiCo_(2)S_(4)@ZnIn_(2)S_(4)分级空心异质结构光催化剂。最优NiCo_(2)S_(4)@ZnIn_(2)S_(4)复合样品(NiCo_(2)S_(4)含量:ca.3.1%)的析氢速率高达78μmol·h−1,约是纳米片组装ZnIn_(2)S_(4)光催化剂析氢速率的9倍、约是1%(w,质量分数)Pt/ZnIn_(2)S_(4)样品析氢速率的3倍。此外,该复合光催化剂在反应中表现出良好的稳定性。荧光和电化学测试结果表明,NiCo_(2)S_(4)空心球是一种有效的助催化剂,可促进光生载流子的分离和传输,并降低析氢反应的活化能。最后,提出了NiCo_(2)S_(4)@ZnIn_(2)S_(4)光催化析氢的可能反应机理。在NiCo_(2)S_(4)@ZnIn_(2)S_(4)复合光催化剂中,具有高导电性的NiCo_(2)S_(4)助催化剂可快速接受ZnIn_(2)S_(4)上的光生电子,用以还原质子生成氢气,而电子牺牲剂TEOA捕获光生空穴,进而完成光催化氧化还原循环。该研究有望为基于纳米片为次级结构的分级空心异质结光催化剂的设计合成及其光催化制氢研究提供一定的指导。 展开更多
关键词 光催化 产氢 助催化剂 金属硫化物
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Enhanced reflection chiroptical effect of planar anisotropic chiral metamaterials placed on the interface of two media
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作者 Xiu Yang Tao Wei +3 位作者 Feiliang Chen Fuhua Gao Jinglei Du yidong hou 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第10期464-472,共9页
The strong chiroptical effect is highly desirable and has a wide range of applications in biosensing, chiral catalysis,polarization tuning, and chiral photo detection. In this work, we find a simple method to enhance ... The strong chiroptical effect is highly desirable and has a wide range of applications in biosensing, chiral catalysis,polarization tuning, and chiral photo detection. In this work, we find a simple method to enhance the reflection circular dichroism(CDR) by placing the planar anisotropic chiral metamaterials(i.e., Z-shaped PACMs) on the interface of two media(i.e., Z-PCMI) with a large refractive index difference. The maximum reflection CDR from the complex system can reach about 0.840 when the refractive index is set as ntop = 4.0 and nbottom = 1.49, which is approximately three times larger than that of placing the Z-shaped PACMs directly on the substrate(i.e., Z-PCMS). While the minimum reflection CDR is 0.157 when the refractive index is set as ntop = 1.0 and nbottom = 1.49. So we can get a large available range of reflection CDR from -0.840 to -0.157. Meanwhile, the transmission CDT remains unchanged with the refractive index ntop increment. Our in-depth research indicates that the large reflection CDR is derived from the difference of non-conversion components of the planar anisotropic chiral metamaterials’ reflection matrices. In short, we provide a simple and practical method to enhance the chiroptical effect by changing the refractive index difference between two media without having to design a complex chiral structure. 展开更多
关键词 chiroptical effect chiral metamaterials refractive index
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Giant Broadband One Way Transmission Based on Directional Mie Scattering and Asymmetric Grating Diffraction Effects
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作者 Xuannan Wu Guanwen Yuan +4 位作者 Rui Zhu Jicheng Wang Fuhua Gao Feiliang Chen yidong hou 《Chinese Physics Letters》 SCIE CAS CSCD 2020年第4期57-61,共5页
High performance optical diode-like devices are highly desired in future practical nano-photonic devices with strong directional selectivity.We demonstrate a kind of giant broadband reciprocity optical diode-like devi... High performance optical diode-like devices are highly desired in future practical nano-photonic devices with strong directional selectivity.We demonstrate a kind of giant broadband reciprocity optical diode-like devices by simultaneously using the directional Mie scattering effect and the asymmetric grating diffraction effect.The maximum asymmetric subtraction and the asymmetric transmission ratio can reach nearly 100%and 40dB at specified wavelength,respectively.In a wide waveband from 500nm to 800nm,the asymmetric subtraction and the ratio keep larger than 80%and 3.5 dB,respectively,even under oblique incidence.To the best of our knowledge,this is the best one-way-transmission effect observed in the reciprocity optical diode-like devices.In addition,we further demonstrate that this one-way-transmission effect can bring an effective absorption enhancement on gold films.The giant,broadband and angle-insensitive one-way-transmission effect demonstrated here is far beyond the well-known anti-reflection effect in the light-trapping devices and will bring new design philosophy for nano-photonic devices. 展开更多
关键词 SCATTERING effect directional
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晶面空间分离型聚三嗪亚胺基氮化碳纳米球用于光催化全分解水研究 被引量:2
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作者 郑丹丹 王乾 +3 位作者 潘志明 汪思波 侯乙东 张贵刚 《Science China Materials》 SCIE EI CAS CSCD 2024年第6期1900-1906,共7页
通过传统熔盐法合成的聚三嗪亚胺(PTI)其六棱柱晶体倾向于沿熔盐模板生长为聚晶形态,这使得其侧面活性面难以充分暴露.在本文中,我们通过耦合熔盐法和硬模板法制备得到了具有高结晶性和侧面暴露的PTI纳米球.研究表明,熔点合适的LiCl/NaC... 通过传统熔盐法合成的聚三嗪亚胺(PTI)其六棱柱晶体倾向于沿熔盐模板生长为聚晶形态,这使得其侧面活性面难以充分暴露.在本文中,我们通过耦合熔盐法和硬模板法制备得到了具有高结晶性和侧面暴露的PTI纳米球.研究表明,熔点合适的LiCl/NaCl二元熔盐促进了高结晶六棱柱的形成,此外,三维模板使六棱柱能够沿空间分离方向定向生长.优化后的PTI显示出具有完全扩展的π共轭聚合结构,且具有空间暴露更完全的活性晶面.因此,制备得到的PTI纳米球光催化全分解水性能得到显著提升. 展开更多
关键词 碳纳米球 光催化 硬模板法 定向生长 熔盐法 高结晶性 空间分离 亚胺基
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Salt-melt synthesis of poly(heptazine imide)in binary alkali metal bromides for enhanced visible-light photocatalytic hydrogen production 被引量:1
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作者 Yaxuan Jin Dandan Zheng +6 位作者 Zhongpu Fang Zhiming Pan Sibo Wang yidong hou Oleksandr Savateev Yongfan Zhang Guigang Zhang 《Interdisciplinary Materials》 EI 2024年第3期389-399,共11页
Poly(heptazine imide)(PHI),a semicrystalline version of carbon nitride photocatalyst based on heptazine units,has gained significant attention for solar H_(2)production benefiting from its advantages including molecul... Poly(heptazine imide)(PHI),a semicrystalline version of carbon nitride photocatalyst based on heptazine units,has gained significant attention for solar H_(2)production benefiting from its advantages including molecular synthetic versatility,excellent physicochemical stability and suitable energy band structure to capture visible photons.Typically,PHI is obtained in saltmelt synthesis in the presence of alkali metal chlorides.Herein,we examined the role of binary alkali metal bromides(LiBr/NaBr)with diverse compositions and melting points to rationally modulate the polymerization process,structure,and properties of PHI.Solid characterizations revealed that semicrystalline PHI with a condensedπ-conjugated system and rapid charge separation rates were obtained in the presence of LiBr/NaBr.Accordingly,the apparent quantum yield of hydrogen using the optimized PHI reaches up to 62.3%at 420 nm.The density functional theory calculation shows that the dehydrogenation of the ethylene glycol has a lower energy barrier than the dehydrogenation of the other alcohols from the thermodynamic point of view.This study holds great promise for rational modulation of the structure and properties of conjugated polymeric materials. 展开更多
关键词 crystallinity hydrogen evolution photocatalysis poly(heptazine imide) salt-melt synthesis
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S-scheme heterojunction of crystalline carbon nitride nanosheets and ultrafine WO_(3)nanoparticles for photocatalytic CO_(2)reduction
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作者 Gongjie Chen Ziruo Zhou +7 位作者 Bifang Li Xiahui Lin Can Yang Yuanxing Fang Wei Lin yidong hou Guigang Zhang Sibo Wang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第6期103-112,共10页
Highly crystalline carbon nitride polymers have shown great opportunities in overall water photosplitting;however,their mission in light-driven CO_(2)conversion remains to be explored.In this work,crystalline carbon n... Highly crystalline carbon nitride polymers have shown great opportunities in overall water photosplitting;however,their mission in light-driven CO_(2)conversion remains to be explored.In this work,crystalline carbon nitride(CCN)nanosheets of poly triazine imide(PTI)embedded with melon domains are fabricated by KCl/LiCl-mediated polycondensation of dicyandiamide,the surface of which is subsequently deposited with ultrafine WO_(3)nanoparticles to construct the CCN/WO_(3)heterostructure with a S-scheme interface.Systematic characterizations have been conducted to reveal the compositions and structures of the S-scheme CCN/WO_(3)hybrid,featuring strengthened optical capture,enhanced CO_(2)adsorption and activation,attractive textural properties,as well as spatial separation and directed movement of light-triggered charge carriers.Under mild conditions,the CCN/WO_(3)catalyst with optimized composition displays a high photocatalytic activity for reducing CO_(2)to CO in a rate of 23.0μmol/hr(i.e.,2300μmol/(hr·g)),which is about 7-fold that of pristine CCN,along with a high CO selectivity of 90.6%against H2formation.Moreover,it also manifests high stability and fine reusability for the CO_(2)conversion reaction.The CO_(2)adsorption and conversion processes on the catalyst are monitored by in-situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS),identifying the crucial intermediates of CO_(2)^(*)-,COOH^(*)and CO^(*),which integrated with the results of performance evaluation proposes the possible CO_(2)reduction mechanism. 展开更多
关键词 Crystalline carbon nitride Photocatalysis CO_(2)reduction S-scheme WO_(3)
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Extended light absorption and accelerated charge migration in ultrathin twisted carbon nitride nanoplates for efficient solar hydrogen production
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作者 Yanmin Zou Shiyao Li +4 位作者 Dandan Zheng Jianyong Feng Sibo Wang yidong hou Guigang Zhang 《Science China Chemistry》 SCIE EI CAS CSCD 2024年第7期2215-2223,共9页
Polymeric carbon nitride has been widely developed as a promising photocatalyst for solar hydrogen production via photocatalytic water splitting.However,pristine carbon nitride prepared by traditional solid-state poly... Polymeric carbon nitride has been widely developed as a promising photocatalyst for solar hydrogen production via photocatalytic water splitting.However,pristine carbon nitride prepared by traditional solid-state polymerization usually encounters issues such as rapid carrier recombination and insufficient absorption of visible light below 460 nm.Herein,poly(heptazine imide)with a distinctive nanoplate structure was synthesized in a binary molten salt of NaCl–CaCl_(2).The salt template allows the formation of the thin nanoplate structure,which promotes the charge separation and migration.Besides,the intercalation of Ca^(2+)ions between the conjugated layers endows the activation of n–π*electron transition due to the distortion of in-plane heptazine layers.Accordingly,the optimized poly(heptazine imide)nanoplates achieve an apparent quantum efficiency of up to 17.3%at 500 nm for photocatalytic hydrogen production from water.This work shares new idea for rational control of the optical absorption and charge carrier dynamics of poly(heptazine imide). 展开更多
关键词 photocatalysis poly heptazine imide NANOPLATES ion intercalation hydrogen production
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Defect and nanostructure engineering of polymeric carbon nitride for visible-light-driven CO_(2) reduction
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作者 Ziruo Zhou Wenyu Guo +6 位作者 Tingyu Yang Dandan Zheng Yuanxing Fang Xiahui Lin yidong hou Guigang Zhang Sibo Wang 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2024年第3期10-18,共9页
Sunlight-induced photocatalytic carbon dioxide(CO_(2))reduction to energy-rich chemicals by metal-free polymeric carbon nitride(CN)semiconductor is a promising tactic for sustained solar fuel production.However,the re... Sunlight-induced photocatalytic carbon dioxide(CO_(2))reduction to energy-rich chemicals by metal-free polymeric carbon nitride(CN)semiconductor is a promising tactic for sustained solar fuel production.However,the reaction efficiency of CO_(2)photoreduction is restrained seriously by the rapid recombination of photogenerated carriers on CN polymer.Herein,we incorporate 2-aminopyridine molecule with strong electron-withdrawing group into the skeleton edge of CN layers through a facile one-pot thermal polymerization strategy using urea as the precursor,which renders a modified carbon nitride(ACN)with extended optical harvesting,abundant nitrogen defects and ultrathin nanosheet structure.Consequently,the ACN photocatalyst with desirable structural features attains enhanced separation and migration of photoexcited charge carriers.Under visible light irradiation with Co(bpy)^(2+)_(3)as a cocatalyst,the optimized ACN sample manifests a high CO_(2)deoxygnative reduction activity and high sta-bility,providing a CO yielding rate of 17μmol h^(-1),which is significantly higher than that of pristine CN.The key intermediates engaged in CO_(2)photoreduction reaction are determined by the in situ diffuse reflectance infrared Fourier transform spectroscopy,which sponsors the construction of the possible photocatalytic CO_(2)reduction mechanism on ACN nanosheets. 展开更多
关键词 Carbon nitride PHOTOCATALYSIS CO_(2)reduction Nitrogen defects NANOSHEETS
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Synthesis and Photoluminescence Enhancement of Silver Nanoparticles Decorated Porous Anodic Alumina 被引量:1
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作者 Song Ye yidong hou +5 位作者 Renyi Zhu Shulong Gu Jingquan Wang Zhiyou Zhang Sha Shi Jinglei Du 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2011年第2期165-169,共5页
Silver nanoparticles(Ag NPs) were successfully assembled in porous anodic alumina(AAO) templates via a green silver mirror reaction.The Ag NPs/AAO composite templates then were characterized by field emission scan... Silver nanoparticles(Ag NPs) were successfully assembled in porous anodic alumina(AAO) templates via a green silver mirror reaction.The Ag NPs/AAO composite templates then were characterized by field emission scanning electron microscopy(FESEM),energy-dispersive X-ray microanalysis(EDX),and X-ray diffraction(XRD).Furthermore,the photoluminescence(PL) properties were also investigated.Compared with the blank AAO,the PL intensity of Ag NPs/AAO templates are enhanced and the maximum enhancement is 2.58 times.Based on the local electric field enhancement effect,the theoretical values were also deduced,which are basically coincident with the experimental. 展开更多
关键词 NANOCOMPOSITE Photoluminescence enhancement Local electric field enhancement
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