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Dimethylamine oxalate manipulating CsPbI_(3) perovskite film crystallization process for high efficiency carbon electrode based perovskite solar cells

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Journal of Energy Chemistry 2024年第6期93卷 221-228,I0006页

作者： Wenran Wang Xin Peng Jianxin Zhang Jiage Lin Rong Huang Guizhi Zhang Huishi Guo Zhenxiao Pan Xinhua Zhong Huashang Rao Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and EnergySouth China Agricultural UniversityGuangzhou 510642GuangdongChina College of Chemistry and Civil Engineering Shaoguan UniversityShaoguan 512005GuangdongChina Guangdong Provincial Key Laboratory of Utilization and Conservation of Food and Medicinal Resources in Northern Region Shaoguan UniversityShaoguan 512005GuangdongChina

Crystallization process determines the quality of perovskite films and the performances of resultant perovskite solar cells(PSCs).Dimethylamine oxalate has been proven as a multifunctional modulator,and is explored as an efficient additive in manipulating the crystallization process of CsPbI_(3) perovskite films.On one hand,oxalate serves as the precipitator that facilitates the nucleation process of intermediate.The larger size of intermediate is conductive to the larger size and smaller grain boundaries of resultant perovskite.On the other hand,in subsequent annealing process,the phase conversion and growth process of transient perovskite can be decelerated due to the strong interactions of oxalate with both dimethylamine cation(DMA^(+))and Pb^(2+).Due to the optimized crystallization kinetics,the morphology and quality of CsPbI_(3) perovskite films are comprehensively improved with lower defect concentrations,and charge recombination loss is effectively suppressed.Benefiting from the optimized crystal quality of perovskite films,the carbon electrode-based CsPbI_(3) PSCs exhibit a champion efficiency of 18.48%.This represents one of the highest levels among all hole transport layer-free inorganic perovskite solar cells.

关键词： Solar cells Perovskite CsPbI_(3) Carbon electrodes oxalate

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Synthesis,crystal structure,and magnetic properties of a new onedimensional chain antiferromagnet Co(ox)(bib)·H_(2)O(ox=oxalate;bib=1,4-bis(imidazole-1-yl)benzene)

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Nano Research 2023年第2期16卷 3552-3557页

作者： Yan She Yanhong Wang Shuang Li Tao Wang Hongcheng Lu School of Chemistry and Chemical Engineering Key Laboratory of Material Chemistry for Energy Conversion and StorageHubei Key Laboratory of Bioinorganic Chemistry&Materia MedicaHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

A new one-dimensional(1D)chain antiferromagnet Co(ox)(bib)·H_(2)O 1(ox=oxalate;bib=1,4-bis(imidazole-1-yl)benzene)has been successfully synthesized under hydrothermal condition and characterized by single crystal X-ray crystallography,powder X-ray diffraction,thermogravimetric analysis,Fourier transform infrared(FTIR)spectroscopy,magnetic susceptibility,and heat capacity measurements.The CoII ion is connected by oxalate ions in trans-configuration to form 1D CoII–ox–CoII spin chains,which are further separated by the long organic molecule bib.The magnetic susceptibility curve shows that 1 exhibits a feature of broad maximum around 29 K,indicating strong antiferromagnetic interactions with short spin–spin correlations along the spin chains.However,no long-range order is observed due to the negligible interchain interactions through bib ligand and weak hydrogen bonds,which is further confirmed by the heat capacity data.The intrachain interaction J of−8.4 K is estimated.Both magnetic susceptibility and heat capacity results indicate that 1 exhibits a good 1D magnetism.

关键词： 1,4-bis(imidazole-1-yl)benzene antiferromagnetic cobalt chain structure oxalate

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A collaborative strategy for enhanced reduction of Cr(Ⅵ) by Fe(0) in the presence of oxalate under sunlight:Performance and mechanism

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Journal of Environmental Sciences 2020年第4期32卷 385-394页

作者： Qi Zhou Yang Li Heng Yang Yun Gao College of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Chengdu Integrated Testing Center of Rocks and Ores Sichuan Geology and Mineral Exploration and Development BureauChengdu 610081China Anhui Electric Power Construction Second Engineering Co.Ltd. China Energy Construction GroupHefei 230000China

Nanometer-size zero-valent iron(NZVI)is an efficient reducing agent,but its surface is easily passivated with an oxide layer,leading to reaction inefficiency.In our study,oxalate(OA)was introduced into this heterogeneous system of NZVI,which could form ferrioxalate complexes with the NZVI surface-bound Fe3+and dissolved Fe3+in the solution.Photolysis of ferrioxalate complexes can facilitate the generation of Fe2+from Fe3+and CO2·-radical,both species have strong reduction capacity.Hence,a"photo-oxalate-Fe(0)"system through sunlight induction was established,which not only prohibited the formation of a surface passivation layer,but also displayed a synergetic mechanism of ferrioxalate photolysis to enhance reduction,exhibiting remarkably higher degradation activity(several times faster)toward the model pollutant Cr(Ⅵ)than the mechanism with NZVI alone.Factor tests suggested that both NZVI dosage and OA content markedly affected the reduction rate.Low pH was beneficial to the reduction efficiency.Moreover,recyclability experiment showed that the reduction rate decreased from 0.21706 to 0.03977 min-1 after three cycles of reuse due to the NZVI losing reaction activity generally,but the system still maintained considerable reduction capacity.Finally,a mechanism was revealed whereby NZVI would transform to Fe oxides after the exhaustion of its reductive power,and the photolysis of ferrioxalate to promote the cycling of iron species played the predominant role in providing extra reduction ability.These features confirm that introduction of OA into Cr(Ⅵ)reduction by NZVI through sunlight induction is advantageous and promising.

关键词： Nanometer-size zero-valent iron oxalate Sun irradiation Photolysis of ferrioxalate Cycling of surface iron Synergetic mechanism

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In vitro antilithiatic activity of the hydro-alcoholic extract of Cinnamomum zeylanicum Blume bark on calcium oxalate crystallization

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Journal of Integrative Medicine 2019年第4期17卷 273-281页

作者： Sana Zaki Nasreen Jahan Mohd Kalim Ghausia Islam Department of Ilmus Saidla (Pharmacy) Glocal College of Unani Medicine Glocal University Saharanpur 247001 UP India Department of llmul Advia (Pharmacology) National Institute of Unani Medicine Rajiv Gandhi University of Health Sciences Bengaluru 560091 Karnataka India Department of Preventive and Social Medicine Ajmal Khan Tibbiya College Aligarh Muslim University Aligarh 202002 UP India

Objective: The study examines the effect of the hydro-alcoholic extract of Cinnamomum zeylanicum Blume bark on crystallization of calcium oxalate. Methods: The antilithiatic effect of various concentrations of the hydro-alcoholic extract of C. zeylanicum was investigated at various stages of stone formation, using Cystone as a stan da rd refere nee drug. The effect on calcium oxalate crystallization was evaluated by measuring the change in turbidity over time, during crystal nucleation, growth and aggregation, in the metastable solution of calcium chloride and sodium oxalate. The slope from the change in turbidity over time was measured using a spectrophotometer at 620 and 214 nm in respective tests. The inhibition rate was estimated by comparing turbidity in the presence and absence of extract. Crystals formed under experimental conditions were observed under a light microscope, and number and shape of the crystals were assessed in a randomly selected field. Phytochemical analysis and high-performance thin-layer chromatography of the extract was also carried out. Results: C. zeylanicum significantly reduced crystal nucleation at concentrations of 4, 8 and 10 mg/mL (P< 0.001). The inhibition percentage of crystal growth was between 28.30% and 92.46% in the presence of C. zeylanicum extract and from 20.76% to 64.15% with various concentrations of Cystone. The maximum inhibition of crystal growth was obtained from C. zeylanicum at 2 mg/mL (92.46%). Microscopic examination revealed a reduction in the number and size of crystals. In the aggregation assay, the inhibition percentage of C. zeylanicum was between 16.27% and 100%, while Cystone was from -214.68% to 100% at different concentrations. The highest (100%) inhibition of aggregation was found at 4 mg/mL of both the test and standard drugs. Conclusion: We found that C. zeylanicum hydro-alcoholic extract has notable inhibitory effects on various stages of crystallization, in terms of turbidity of solution, as well as the crystal size, number and morphology.

关键词： Antilithiatic activity Calcium oxalate Inorganic inhibitors In vitro Unani medicine

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Dependence of bisphenol A photodegradation on the initial concentration of oxalate in the lepidocrocite-oxalate complex system

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Journal of Environmental Sciences 2006年第4期18卷 777-782页

作者： DONG Jun LI Fang-bai LAN Chong-yu LIU Cheng-shuai LI Xiao-min LUAN Tian-gang School of Life Science Sun Yat-sen University Guangzhou 510275 China Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control Guangdong Institute of Eco-Environment and Soil Science Guangzhou 510650 China Zhongshan Institute University of Electronic Science and Technology of China Zhongshan 528402 China

To understand the degradation of endocrine disrupting chemicals （EDCs） in natural environment with existence of iron oxides and carboxylic acids, the dependence of bisphenol A （BPA） photodegradation on the initial concentration of oxalate （Cox） in lepidocrocite （y-FeOOH） aqueous suspension was investigated under both UV and visible lights in this study. Lepidocrocite powder was home-prepared by a hydrothermal process. It was found that BPA degradation was promoted greatly in the presence of oxalate owing to the formation of lepidocrocite-oxalate complex. And there was an optimal Cox, which was 2.0 and 2.4 mmol/L, under UV and visible lights, respectively. The first-order kinetic constant, k value increased 38 times from 0.17 × 10^-2 min^-1 in the absence of oxalate to 6.39 × 10^-2 min^-1 in the presence of oxalate with an optimal Cox （2.0 mmol/L） under UV irradiation, and almost 306 times from 0.02 × 10^-2 min^-1 in the absence of oxalate to 6.11 × 10^-2 min^-1 in the presence of oxalate with an optimal Cox （2.4 mmol/L） under visible irradiation. The BPA degradation rate increased and the first-order kinetic constants decreased with the increase in BPA initial concentration. The dependence of the variation of pH value, total-Fe and Fe^2＋ during the photoreaction on Cox was also investigated. The pH value increased obviously with the reaction time. Total-Fe increased dramatically at the first 5 min and then decreased quickly under UV irradiation and slowly under visible irradiation. The initial concentration of oxalate is a main factor to affect BPA photodegradation in aqueous suspension under both UV and visible lights.

关键词： bisphenol A lepidocrocite oxalate photodegradation

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Oxidative degradation of phenol by sulfidated zero valent iron under aerobic conditions:The effect of oxalate and tripolyphosphate ligands

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Journal of Environmental Sciences 2021年第2期33卷 82-89页

作者： Xianglong Kong Chengwu Zhang Jingyi Zhang Lishuang Xuan Chuanyu Qin Key Laboratory of Groundw ater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China Jilin Prouindal Key Laboratory of Water Resources and Enuironment jinin UniversityChangchun 130021China National and Local Joint Engineering Laboratory for Petrochem ical Contaminated Site Control and Remediation Technology Jilin UniversityChangchun 130021China

After adding either organic or inorganic ligands,sulfidated nano-zero-valent iron(Sn ZVI)was used for aerobic degradation of phenol,and the effect of the ligand species on oxidation performance was investigated.We found that Sn ZVI hardly degraded phenol in the absence of ligand addition.Ligands initiated and promoted the degradation of pollutants by Sn ZVI.The data herein show that a characteristic inorganic ligand,tripolyphosphate(TPP),is more effective in enhancing oxidation than a characteristic organic ligand oxalate.In addition to the scavenging of reactive oxidants by the organic ligand,more ferrous ion(Fe(Ⅱ))dissolution from Sn ZVI in the TPP system is another cause for the superior enhancement by the inorganic ligand.In the oxalate system,as the sulfur content of Sn ZVI increased,the oxidation efficiency increased because Fe S shell promoted the transfer of electrons to produce more reactive oxygen species(ROS).In TPP system,the effect of sulfur content on oxidation performance is more complex.The Sn ZVI with low sulfur content showed poor oxidation performance compared with that of n ZVI.Further experiments proved that sulfidation might weaken the complexation of TPP with surface bound Fe,which would slow down the ionic Fe(II)dissolution rate.Therefore,sulfidation has the dual effects of enhancing electron transfer and inhibiting the complexation of inorganic ligands.In addition,the mechanisms of ROS generation in different ligand systems were investigated herein.Results showed that the critical ROS in both the oxalate and TPP systems are hydroxyl radicals,and that they are produced via one-electron activation of O_(2).

关键词： Zero valent iron Sulfidation Tripolyphosphate oxalate Oxygen activation

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Removal of iron from ilmenite by KOH leaching-oxalate leaching method

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Rare Metals 2010年第1期29卷 9-15页

作者： WANG Yuanbo QI Tao CHU Jinglong ZHAO Wei Graduate School of Chinese Academy of Sciences Beijing 100039 China Key laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China

Oxalic acid was used for the removal of iron from the intermediates of ilmenite leached by KOH liquor. Various parameters, such as pH, temperature, initial oxalate concentration, and illumination were investigated. Meanwhile, it was found that orthorhombic crystal Ti2O2（OH）2（C2O4）-H2O formed as the leaching proceeded. Scanning electronic microscope （SEM） images implied that the formation of Ti2O2（OH）2（C2O4）.H2O with good crystallinity proceeded through three stages. Calcining Ti2O2（OH）2（C2O4）·H2O, anatase （350℃） or mtile （550℃） type TiO2 was obtained, respectively. Element analysis found that the calcined product contained 94.9% TiO2 and 2.5% iron oxide, but only about 1600 ppm dissolvable iron oxide was left, which indicates that oxalic acid was comparatively effective on iron oxide removal from the intermediates. Finally, an improved route was proposed for the upgrading of ilmenite into mtile.

关键词： ilmenite iron removal titanium oxide oxalate potassium hydroxide KOH leaching

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Flow Injection Determination of oxalate Based on Its Catalytic Effect on the Oxidation of p-Chloride Aniline by Dichromate

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Chemical Research in Chinese Universities 2001年第3期17卷 253-258页

作者： LI Li-jun WEI Hong-guang ZHANG Ying Guangxi Institute of Technology Liuzhou 545006P.R.China

In a sulfuric acid medium, oxalate exhibits a strong catalytic effect on the oxidation of p-chloride aniline(ClBN) by dichromate, and the red oxidation product of ClBN has a maximum absorhancy at 520 nm. Based on this founding, a new FI method for determining oxalate was developed. A calibration curve of oxalate in the range of 0.40—17.0μg/mL was obtained. The detection limit was 0.10μg/mL. Sampling rate was 103-samples/h. The possible interference by the co-existing substances or ions was examined. This new method was applied to the determination of micro amounts of oxalate in real samples with satisfactory results.

关键词： FIA oxalate p-Chloro aniline Potassium dichromate

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Facile synthesis of flake-like dihydrate zinc oxalate particles

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International Journal of Minerals,Metallurgy and Materials 2019年第2期26卷 234-240页

作者： Xing Chen Xin Liu Kai Huang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Global Energy Research Institute Future Science and Technology Park Beijing Key Lab of Green Recycling and Extraction of Metals University of Science and Technology Beijing

Monodispersed dihydrated zinc oxalate(ZnC_2O_4·2H_2O) particles with characteristic morphology were synthesized by aging a mixed solution of zinc nitrate(Zn(NO_3)_2) and sodium oxalate(Na_2C_2O_4) in the presence of a citrate ligand, with an average flat size of approximately 10–15 μm. The important parameters, including the solution pH values and the concentration of the zinc ions and citrate ligand, were investigated using a series of experiments. It is verified that the citrate ligand significantly affects the morphology of zinc oxalate particles, probably via its multiple roles of chelating, dispersing, and selective absorption. Thermodynamic equilibrium of the distribution of zinc species in an aqueous solution of Zn(Ⅱ)-citrate-oxalate-H_2O was estimated to explain the experimental results and to clarify the size and morphological evolution mechanism of the precipitated particles.

关键词： facile synthesis zinc oxalate flaky morphology citrate ligand one-pot synthesis

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Synthesis, Structure, and Magnetic and Optical Properties of a Novel Chain-like oxalate-bridging Samarium Complex

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Chinese Journal of Structural Chemistry 2007年第9期26卷 1112-1117页

作者：蔡丽珍郭国聪吴阿清付明来董振超 MATSUSHITA Akiyuki State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China National Institute for Materials Science 1-2-1 Sengen

A new lanthanide complex [Sm（C2O4）（H2O）5]nCln·2nH2O has been obtained by hydrothermal synthetic method. The crystal belongs to monoclinic, space group P21/n, with a = 7.5438（6）, b = 14.3201（11）, c = 10.8608（9）A, β = 94.565（4）°, V = 1169.55（16）A^3, C2H14ClO11Sm, Mr = 399.93, Z = 4, Dc = 2.271 g/cm^3, μ = 5.290 cm^-1, F（000） = 772, the final R = 0.0271 and wR = 0.0632 for 1880 observed reflections with I 〉 2σ（I）. X-ray crystal analysis reveals that each Sm（III） atom is nine-coordinated by four oxygen atoms from two oxalate ligands and five coordinated water molecules in a distorted tricapped trigonal prism. The chain-like structure of lanthanide oxalate is reported for the first time. The fluorescent property and magnetic behavior of the title compound were investigated. The θ of –14.3（2）° and J of –0.26 cm^-1 indicate antiferromagnetic interaction in the molecule.

关键词： lanthanide luminescent magnetic oxalate structure

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