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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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Journal of Environmental Sciences 2024年第6期140卷 103-112页

作者： Gongjie Chen Ziruo Zhou Bifang Li Xiahui Lin Can Yang yuanxing fang Wei Lin Yidong Hou Guigang Zhang Sibo Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFujian 350116China

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 *** 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 *** 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 *** 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 ***,it also manifests high stability and fine reusability for the CO_(2)conversion *** 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.

关键词： Crystalline carbon nitride Photocatalysis CO_(2)reduction S-scheme WO_(3)

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Photocatalytic oxidation of methane to methanol over zinc titanate supported silver catalysts

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Journal of Rare Earths 2024年第5期42卷 899-906,I0004页

作者： Yuyan Gan Jinbi Huang Qian Lv Yanru Li Lizhi Wu YU Tang yuanxing fang Pengfei Zhu Li Tan Institute of Molecule Catalysis and In-Situ/Operando Studies State Key Laboratory of Photocatalysis on Energy and EnvironmentCollege of ChemistryFuzhou UniversityFuzhou350108China School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi'an 70021China

The direct activation of methane under mild condition to achieve highly selective of oxygenates is a challenging *** this study,a well dispersed silver supported ZnTiO_(3) catalyst was prepared to achieve selective preparation of methanol from methane and water under mild condition.X-ray diffraction,transmission electron microscopy and X-ray photoelectron spectroscopy characterizations demonstrate that silver species are uniformly dispersed on ZnTiO_(3) surface in the form of metallic silver *** photoelectric characterizations reveal that the addition of silver species enhances light absorption and promotes charge separation of the *** the reaction conditions of 50℃and 3 MPa,the methanol is obtained as the only liquid product over the designed Ag/ZnTiO_(3) catalyst under light *** this photocatalytic process,the holes generated by ZnTiO_(3) activate water to produce intermediate·OH,which further reacts with methane to synthesize *** silver species as co-catalysts extend the light absorption range of ZnTiO_(3) as well as promote charge separation.

关键词： Photocatalytic Methane oxidation Zinc titanate Silver Methanol

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Defect and nanostructure engineering of polymeric carbon nitride for visible-light-driven CO2 reduction

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结构化学 2024年第3期43卷 10-18页

作者： Ziruo Zhou Wenyu Guo Tingyu Yang Dandan Zheng yuanxing fang Xiahui Lin Yidong Hou Guigang Zhang Sibo Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou350116China College of Environment and Safety Engineering Fuzhou UniversityFuzhou350108China

Sunlight-induced photocatalytic carbon dioxide(CO2)reduction to energy-rich chemicals by metal-free polymeric carbon nitride(CN)semiconductor is a promising tactic for sustained solar fuel ***,the reaction efficiency of CO2 photoreduction is restrained seriously by the rapid recombination of photogenerated carriers on CN ***,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 ***,the ACN photocatalyst with desirable structural features attains enhanced separation and migration of photoexcited charge *** visible light irradiation with Co(bpy)32+as a cocatalyst,the optimized ACN sample manifests a high CO2 deoxygnative reduction activity and high sta-bility,providing a CO yielding rate of 17 μmol h-1,which is significantly higher than that of pristine *** key intermediates engaged in CO2 photoreduction reaction are determined by the in situ diffuse reflectance infrared Fourier transform spectroscopy,which sponsors the construction of the possible photocatalytic CO2 reduction mechanism on ACN nanosheets.

关键词： Carbon nitride Photocatalysis CO_2 reduction Nitrogen defects Nanosheets

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Self-template synthesis of hollow Fe-doped CoP prisms with enhanced oxygen evolution reaction activity

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Journal of Energy Chemistry 2021年第11期30卷 415-422,I0009页

作者： Xueda Ding Haitao Huang Qiang Wan Xu Guan yuanxing fang Sen Lin Dongyang Chen Zailai Xie College of Materials Science and Engineering Fuzhou UniversityFuzhou 350116FujianChina Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials College of ChemistryFuzhou UniversityFuzhou 350116FujianChina

The development of efficient, durable and low cost electrocatalysts is crucial but extremely challenging for the oxygen evolution reaction (OER). Herein, we develop a self-template strategy to synthesize hollow Fe-doped CoP prisms (Fe-CoP) via ion exchange of cobalt acetate hydroxide with [Fe(CN)_(6)]^(3-) and phosphorization-induced transformation of CoFe-PBA (Co/Fe-containing prussian blue analogue) prisms in N2 atmosphere. The obtained Fe-CoP not only inherits the hollow prism-like morphology of CoFe-PBA, but also forms rich mesoporous channel. The Fe-CoP prisms exhibit extraordinary OER performances in 1.0 M KOH, with a low overpotential of 236 mV to deliver a current density of 10 mA cm^(−2) and a low Tafel slope of 32.9 mV dec^(–1). Moreover, the presented electrocatalyst shows good long-term operating durability and activity. The XPS and TEM analysis confirm that Fe-CoP has undergone surface reconstruction in the process of electrocatalytic OER, and the in situ formed oxides and oxyhydroxides are the real active species to boost OER. This work provides a promising pathway to the design and synthesis of efficient and robust electrocatalysts with hierarchical hollow structure for boosting OER.

关键词： Prussian blue analogue Hollow structure Fe-doped CoP Oxygen evolution reaction

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Photocatalysis:an overview of recent developments and technological advancements

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Science China Chemistry 2020年第2期63卷 149-181页

作者： yuanxing fang Yun Zheng Taofang Yong Chen Yaodong Zhu Qing Liang Hua Sheng Zhaosheng Li Chuncheng Chen Xinchen Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116China Key Laboratory of Molecular Designing and Green Conversions Fujian Province UniversityCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093China Key Laboratory of Photochemistry CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Photocatalysis,which is the catalyzation of redox reactions via the use of energy obtained from light sources,is a topic that has garnered a lot of attention in recent years as a means of addressing the environmental and economic issues plaguing society *** particular interest are photosynthesis can potentially mimic a variety of vital reactions,many of which hold the key to develop sustainable energy *** light of this,many of the technological and procedural advancements that have recently occurred in the field are discussed in this review,namely those linked to:(1)photocatalysts made from metal oxides,nitride,and sulfides;(2)photocatalysis via polymeric carbon nitride(PCN);and(3)general advances and mechanistic insights related to TiO2-based *** challenges and opportunities that have arisen over the past few years are discussed in *** concepts and experimental procedures which could be useful for eventually overcoming the problems associated with photocatalysis are presented herein.

关键词： photocatalysis carbon nitride metal oxides metal nitride metal sulfide mechanism TiO2

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cPCN-Regulated SnO_(2) Composites Enables Perovskite Solar Cell with Efficiency Beyond 23%

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Nano-Micro Letters 2021年第7期13卷 12-27页

作者： Zicheng Li Yifeng Gao Zhihao Zhang Qiu Xiong Longhui Deng Xiaochun Li Qin Zhou yuanxing fang Peng Gao CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianPeople’s Republic of China College of Chemistry Fuzhou UniversityFuzhou 350116People’s Republic of China Laboratory for Advanced Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021People’s Republic of China

Efficient electron transport layers(ETLs)not only play a crucial role in promoting carrier separation and electron extraction in perovskite solar cells(PSCs)but also significantly affect the process of nucleation and growth of the perovskite ***,crystalline polymeric carbon nitrides(cPCN)are introduced to regulate the electronic properties of SnO_(2) nanocrystals,resulting in cPCN-composited SnO_(2)(SnO_(2)-cPCN)ETLs with enhanced charge transport and perovs-kite layers with decreased grain ***,SnO_(2)-cPCN ETLs show three times higher electron mobility than pristine SnO_(2) while offering better energy level alignment with the perovskite *** SnO_(2)-cPCN ETLs with decreased wettability endow the perovskite films with higher crystallinity by retarding the crystallization *** the end,the power conversion efficiency(PCE)of planar PSCs can be boosted to 23.17%with negligible hysteresis and a steady-state efficiency output of 21.98%,which is one of the highest PCEs for PSCs with modified SnO_(2) ***_(2)-cPCN based devices also showed higher stability than pristine SnO_(2),maintaining 88%of the initial PCE after 2000 h of storage in the ambient environment(with controlled RH of 30%±5%)without encapsulation.

关键词： Electron transport layer Perovskite solar cell Carbon nitride SnO_(2)

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Roles of Metal-Free Materials in Photoelectrodes for Water Splitting

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Accounts of Materials Research 2021年第10期2卷 933-943页

作者： Xiaochun Li Jiawen Wang yuanxing fang Hong Zhang Xianzhi Fu Xinchen Wang State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116P.R.China

CONSPECTUS:Photoelectrochemical(PEC)water splitting is an appealing approach to the hydrogen evolution reaction since it converts sunlight in the form of hydrogen fuel,which has the potential to revolutionize the fossil fuel-based energy systems of the modern *** the last half century,progress has been made with respect to the material,synthesis,and *** developments of multilayered photoelectrodes have made a breakthrough to improve the sunlight conversion efficiency and strengthen the physiochemical *** exploration of new materials for the functional layers of photoelectrodes offers a new opportunity for practical *** the emerging materials,metal-free species have shown superior properties,such as high stability,sustainability,and *** respect to inorganic materials,their physiochemical properties can be readily regulated,including thermodynamics and kinetics,and thus increasing attention has been devoted.

关键词： stability. kinetics breakthrough

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微观形貌调控对g-CN光催化性能影响的综合实验设计

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实验技术与管理 2022年第5期39卷 180-184页

作者：郑丹丹李仪鑫毕进红方元行福州大学环境与安全工程学院福建福州350108 福州大学化学学院能源与环境光催化国家重点实验室福建福州350108

基于前沿课题和研究基础,设计了探究微观形貌调控对氮化碳(g-CN)光催化性能影响的化学综合创新实验。该实验涉及纳米片、纳米棒和纳米球形貌的g-CN材料制备,光催化降解甲基蓝染料性能测试的基本实验操作,以及利用XRD、FT-IR、SEM和紫外... 详细信息

基于前沿课题和研究基础,设计了探究微观形貌调控对氮化碳(g-CN)光催化性能影响的化学综合创新实验。该实验涉及纳米片、纳米棒和纳米球形貌的g-CN材料制备,光催化降解甲基蓝染料性能测试的基本实验操作,以及利用XRD、FT-IR、SEM和紫外-可见分光光度计等仪器表征材料的结构和形貌,并使用Origin软件对数据进行处理和分析等。涵盖了半导体理论、光化学与催化反应以及材料的分子结构、晶体结构和微观结构分析等学科知识点。实验结果表明,g-CN纳米球的光降解性能最优,其对甲基蓝的降解率可达94.5%。

关键词：科教融合光催化氮化碳形貌调控综合实验

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电化学制备异质二氧化钛结构增强其在光电分解水中转化效率（英文）

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Chinese Journal of Catalysis 2018年第3期39卷 438-445页

作者：方元行马一文王心晨福州大学化学学院能源与环境光催化国家重点实验室福建福州350002

本文描述了一种利用电化学方法合成第二型异质二氧化钛纳米棒结构的方法,这种纳米棒由部分还原的黑色二氧化钛和原始的白色二氧化钛组成.这种异质结结构的半还原的二氧化钛纳米棒与原始的白色二氧化钛和完全还原的黑色二氧化钛纳米棒相... 详细信息

本文描述了一种利用电化学方法合成第二型异质二氧化钛纳米棒结构的方法,这种纳米棒由部分还原的黑色二氧化钛和原始的白色二氧化钛组成.这种异质结结构的半还原的二氧化钛纳米棒与原始的白色二氧化钛和完全还原的黑色二氧化钛纳米棒相比,展现出更好的光电催化性能.这可归结于这种条件下合成的纳米棒具备的协同作用.一方面,这类结构增强了整个太阳光光谱的利用率.底层的黑色二氧化钛能够大量吸收可见光,而上层的白色二氧化钛能够较好的利用太阳光中紫外光的部分.另一方面,因为形成了第二型异质结结构,电荷的激发分离和传输得到了有效的控制.这种简单的制备方法可进一步拓展合成其他金属氧化物,来进一步研究光电分解水的性能.本文利用传统的三电极系统:0.05 mol/L的硫酸作为电解液,在加–0.5 V的偏压下进行.相比与已报道的还原手段,该电解液中质子的浓度相对比较低,可以保证这个还原过程逐步发生.电化学还原曲线可以明显反映二氧化钛还原的过程,尽管从扫描电子显微镜中很难观察到响应的区别,但是在该过程中,电极片的颜色发生了明显的变化.相应的,我们将这个系列的电极进行了光学和晶体学的研究,发现其在还原过程中,能带能够逐步减小.而在X射线衍测试当中,仅最终完全还原的得到的样品在20度左右出现两个额外的峰,可归结为还原状态的二氧化钛.电化学扫描进一步测试其能带的相应位置,证明了黑色被还原的二氧化钛和白色的原始二氧化钛是同时存在的.最后将这个系列光电极光电催化分解水的性能进行了比较,发现在同等的测试条件下,形成异质结结构的二氧化钛具有最高的光催化效率,其值大约是白色二氧化钛的三倍,同时也比纯黑的二氧化钛增长了20%左右.另外,异质结结构的二氧化钛与黑色的相比,在可见光区域有相同的效率的同时具备更好的紫外光转化效率.最后,我们分析了异质结形成以后的相对应的能带结构,该结构能够更好的促进光吸收和转化.

关键词：第二型异质结结构光电催化水分解二氧化钛电化学还原改性

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我国混凝土骨料的现状与问题

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建筑技术 2005年第1期36卷 23-25页

作者：陈家珑方源兴北京建工学院建材试验室 100044 中国砂石协会 100835

针对目前我国天然矿石资源短缺、乱采滥挖砂石的现象屡禁不止、砂石质量严重失控的现状,应提高对砂石重要性的认识,引导砂石行业成为保护环境、开发建设用地、充分利用废弃资源的主力军。发展以工业废渣及淤泥、岩石为原料的人造轻骨料... 详细信息

针对目前我国天然矿石资源短缺、乱采滥挖砂石的现象屡禁不止、砂石质量严重失控的现状,应提高对砂石重要性的认识,引导砂石行业成为保护环境、开发建设用地、充分利用废弃资源的主力军。发展以工业废渣及淤泥、岩石为原料的人造轻骨料,积极开展再生骨料的应用研究工作。

关键词：砂石骨料混凝土人工砂

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