检索结果-南通市图书馆

Chinese Journal of Chemistry 2007年第6期25卷 736-742页

作者：张述林李敏娇欧忠文陈国需刘富安谢家庆 Department of Material and Engineering Sichuan University of Science & Engineering Zigong Sichuan 643000 China Engineering Department of Oil Application and Control Engineering Logistical Engineering University Chongqing 400016 China

It has been reported that two Schiff base transition metal complexes bearing the side chain of the morpholine ring were synthesized and characterized, and two complexes with the same base agent but different metal ions were used as a simulant hydrolase in the catalytic hydrolysis of p-nitrophenyl picolinate in this paper. The mechanism of PNPP catalytic hydrolysis is proposed and supported by the results of the spectral analysis and the kinetic calculation. A kinetic mathematical model, applied to the calculation of the kinetic and thermodynamics parameters of PNPP catalytic hydrolysis, has been established on the foundation of the mechanism proposed. The result of the study shows that the two complexes have a good catalytic activity in PNPP catalytic hydrolysis, and the rate of the PNPP catalytic hydrolysis was increased with the increase of the pH values in the buffer solution and affected by the polarization effect of metal ion of the complexes.

关键词： Schiff base complex simulative hydrolase synthesis PNPP hydrolysis catalytic kinetics

Enhanced Redox Electrocatalysis in High‑Entropy Perovskite Fluorides by Tailoring d–p Hybridization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第3期16卷 333-350页

作者： Xudong Li Zhuomin Qiang Guokang Han Shuyun Guan Yang Zhao Shuaifeng Lou Yongming Zhu Department of Applied Chemistry Harbin Institute of Technology at WeihaiWeihai 264209People’s Republic of China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001People’s Republic of China

High-entropy catalysts featuring exceptional properties are,in no doubt,playing an increasingly significant role in aprotic lithium-oxygen *** extensive effort devoted to tracing the origin of their unparalleled performance,the relationships between multiple active sites and reaction intermediates are still ***,enlightened by theoretical screening,we tailor a high-entropy perovskite fluoride(KCoMnNiMgZnF_(3)-HEC)with various active sites to overcome the limitations of conventional catalysts in redox *** entropy effect modulates the d-band center and d orbital occupancy of active centers,which optimizes the d–p hybridization between catalytic sites and key intermediates,enabling a moderate adsorption of LiO_(2)and thus reinforcing the reaction *** a result,the Li–O2 battery with KCoMnNiMgZnF_(3)-HEC catalyst delivers a minimal discharge/charge polarization and long-term cycle stability,preceding majority of traditional catalysts *** encouraging results provide inspiring insights into the electron manipulation and d orbital structure optimization for advanced electrocatalyst.

关键词： Lithium-oxygen batteries KCoMnNiMgZnF_(3)-HEC perovskite fluoride Entropy effect catalytic kinetics d-p orbital hybridization

Enhanced reconstruction of Fe_(5)Ni_(4)S_(8) by implanting pyrrolidone to unlock efficient oxygen evolution

在线全文

学校读者我要写书评

暂无评论

能源化学:英文版 2023年第9期84卷 112-121页

作者： Zhengyan Du Zeshuo Meng Chao Jiang Chenxu Zhang Yanan Cui Yaxin Li Chong Wang Xiaoying Hu Shansheng Yu Hongwei Tian Key Laboratory of Automobile Materials of MOE School of Materials Science and EngineeringJilin UniversityChangchun 130012JilinChina College of Science and Laboratory of Materials Design and Quantum Simulation Changchun UniversityChangchun 130022JilinChina

During oxygen evolution reaction(OER),complex changes have been reported on surfaces of bimetallic Fe-Ni-based catalysts,and regulating the dynamic evolution could improve their electrocatalytic ***,a pyrrolidone-promoted reconstruction of pentlandite was investigated to uncover the correlation between the reconstructed surface and the OER *** theoretical calculations indicated the preferential implantation of pyrrolidone at Fe atoms,useful for regulating the electronic structures of *** vale nce state of Ni increased,suggesting the promotion of the in-situ reconstruction of pentlandite via strengthening hydroxyl adsorption to generate highly active *** electron-rich pentlandite was also found conducive to charge transfer under applied *** Operando Raman and various quasi-in-situ characterizations confirmed the realization of more delocalized electronic structures of pentlandite by introducing ***,in turn,promoted the accumulation of hydroxyl groups on the pentlandite surface,thereby boosting the formation of highly active NiOOH at lower OER ***,the adsorption energies of intermediates were optimized,conducive to enhanced OER reaction *** a proof of concept,the pentlandite decorated by pyrrolidone exhibited an overpotential as low as 265 mV at 10 mA cm^(-2) coupled with stable catalysis for 1000 hours at a high current density of 100 mA cm^(-2).In sum,new insights into unlocking the high catalytic activity of bimetallic Fe-Ni-based catalysts were provided,promising for future synthesis of advanced catalysts.

关键词： Pentlandite Oxygen evolution reaction Reconstruction ability catalytic kinetics

Exploring catalytic behaviors of CoS_(2)-ReS_(2) heterojunction by interfacial engineering

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第10期85卷 11-18,I0002页

作者： Jianmin Yu Yongteng Qian Sohyeon Seo Yang Liu Huong T.D.Bui Ngoc Quang Tran Jinsun Lee Ashwani Kumar Hongdan Wang Yongguang Luo Xiaodong Shao Yunhee Cho Xinghui Liu Min Gyu Kim Hyoyoung Lee Department of Chemistry Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Center for Integrated Nanostructure Physics(CINAP) Institute of Basic Science(IBS)Suwon 16419Republic of Korea College of Pharmacy Jinhua PolytechnicJinhua 321007ZhejiangChina Beamline Research Division Pohang Accelerator Laboratory(PAL)Pohang University of Science and TechnologyPohang 37673Republic of Korea Department of Biophysics Sungkyunkwan University2066 SeoburoJangan-guSuwon 16419Republic of Korea Creative Research Institute Sungkyunkwan University2066 SeoburoJangan-guSuwon 16419Republic of Korea

Herein, a stable and efficient CoS_(2)-ReS_(2) electrocatalyst is successfully constructed by using the different molar ratios of CoS_(2) on ReS_(2). The size and morphology of the catalysts are significantly changed after the CoS_(2) is grown on ReS_(2), providing regulation of the catalytic activity of ReS_(2). Particularly, the optimized CoS_(2)-ReS_(2) shows superior electrocatalytic properties with a low voltage of 1.48 V at 20 mA cm^(-2) for overall water splitting in 1.0 M KOH, which is smaller than the noble metal-based catalysts(1.77 V at 20 mA cm^(-2)). The XPS, XAS, and theoretical data confirm that the interfacial regulation of ReS_(2) by CoS_(2) can provide rich edge catalytic sites, which greatly optimizes the catalytic kinetics and drop the energy barrier for oxygen/hydrogen evolution reactions. Our results demonstrated that interfacial engineering is an efficient route for fabricating high-performance water splitting electrocatalysts.

关键词： CoS_(2) ReS_(2) Interfacial engineering catalytic kinetics Water splitting

Highly electrically conductive graphene papers via catalytic graphitization

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第6期15卷 4902-4908页

作者： Huanqin Peng Xin Ming Kai Pang Yanru Chen Ji Zhou Zhen Xu Yingjun Liu Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang University38 Zheda RoadHangzhou 310027China Beijing Institute of Space Mechanics&Electricity Haidian DistrictBeijing Friendship Road 104Beijing 100094China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

The highly electrically conductive graphene papers prepared from graphene oxide have shown promising perspectives in flexible electronics,electromagnetic interference(EMI)shielding,and *** achieve high electrical conductivity,the graphene oxide precursor usually needs to be graphitized at extremely high temperature(~2,800°C),which severely increases the energy consumption and production ***,we report an efficient catalytic graphitization approach to fabricate highly conductive graphene papers at lower annealing *** graphene papers with boron catalyst annealed at 2,000°C show a high conductivity of~3,400 S·cm^(-1),about 47%higher than pure graphene *** catalyst facilitates the recovery of structural defects and improves the degree of graphitization by 80%.We further study the catalytic effect of boron on the graphitization behavior of graphene *** results show that the activation energy of the catalytic graphitization process is as low as 80.1 kJ·mol^(–1)in the temperature ranges *** effective strategy of catalytic graphitization should also be helpful in the fabrication of other kinds of highly conductive graphene macroscopic materials.

关键词： graphene papers catalytic graphitization boron catalyst catalytic kinetics

Recent Progress in Covalent Organic Frameworks(COFs) for Electrocatalysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2022年第11期41卷 84-99页

作者： Cha Li Zining Qiu Hongming Sun Yijie Yang Cheng-Peng Li College of Chemistry Tianjin Key Laboratory of Structure and Performance for Functional MoleculesTianjin Normal UniversityTianjin 300387China

Electrocatalysis provides various technologies for energy storage and conversion,which is an important part of realizing sustainable clean energy for the ***,as emerging porous crystalline polymers,possess high specific surface areas,tunable pore structures,high crystallinity and tailorable *** features endow COFs with abundant active sites and fast electron transport channels,making them potentially efficient *** recent years,COF-based electrocatalysts have been widely developed for hydrogen evolution reaction(HER),hydrogen oxidation reaction(HOR),oxygen evolution reaction(OER),oxygen reduction reaction(ORR),nitrogen reduction reaction(NRR)and carbon dioxide reduction reaction(CO_(2)RR).In this review,design strategies of COF-based electrocatalysts are briefly summarized,including applying COF as supports,introducing active metals in COF,constructing two-dimensional conductive COF,formation of COF-based hybrid and pyrolysis of COF to obtain carbon ***,the recent research progress in COF-derived catalysts for specific electrocatalytic reactions is introduced ***,the outlook and challenges of future applications of COFs in electrocatalysis are highlighted.

关键词： covalent organic frameworks electrocatalyst catalytic performance catalytic kinetics energy conversion

Studies on PNPP Hydrolysis Catalyzed by Schiff Base Cobalt（Ⅱ） Complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2006年第11期24卷 1498-1504页

作者：胡伟李建章王莹李慈杜娟孟祥光胡常伟曾宪诚 Department of Chemistry Sichuan University Chengdu Sichuan 610064 China Department of Chemistry Sichuan University of Science & Engineering Zigong Sichuan 643000 China College of Bioengineering Chongqing Technology and Business University Chongqing 400060 China

Two cobalt（Ⅱ） complexes of the Schiff base with morpholino or aza-crown ether pendants, CoL^1 and CoL^2, as mimic hydrolytic metalloenzyme, were used in catalytic hydrolysis of carboxylic ester （PNPP）. The analysis of specific absorption spectra of the hydrolytic reaction systems indicates that key intermediates, made up of PNPP and Co（Ⅱ） complexes, have been formed in reaction processes of the PNPP catalytic hydrolysis. The mechanism of PNPP catalytic hydrolysis has been proposed based on the analytic result of specific absorption spectrum. A kinetic mathematical model, applied to the calculation of the kinetic parameter of PNPP catalytic hydrolysis, has been established based on the mechanism proposed. The acid effect of buffer solution, structural effect of the complexes, and effect of temperature on the rate of PNPP hydrolysis catalyzed by the complexes have been also discussed.

关键词： Schiff base cobalt(Ⅱ) complex mimic hydrolase catalytic kinetics carboxylic ester

Kinetic spectrophotometric method for the determination of cerium(IV) with naphthol green B

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2009年第1期28卷 5-8页

作者： LIU Yuying WANG Ping Department of Chemical Engineering Shandong University of Technology Zibo 255049 China

A simple and sensitive spectrophotometric method was described for the determination of cerium（IV） based on its catalytic effect on the oxidation of naphthol green B by potassium periodate in the medium of sulfuric acid. The influences of acidity, concentration of reactants, reaction time, reaction temperature, and foreign ions were discussed, and the optimum reaction conditions were established. The reaction was monitored spectrophotometrieally by measuring the decrease in absorbance of naphthol green B at 710 nm after a fixed time （8 min）. The proposed method allowed the determination of cerium（IV） in the range of 0.08-2.4 μg·mL^-1 with good precision and accuracy, and the detection limit was 0.012 μg·mL^-1. The method was applied successfully for the determination of trace cerium in hair samples without previous separation. Recovery experiments were also performed, and the recovery was between 95.7%-111.0%.

关键词： catalytic kinetics spectrophotometry naphthol green B cerium

Hydrolysis of p-Nitrophenyl Picolinate Catalyzed by Mono-and Binuclear Transition Metal Complexes with Polyether Bridged Dihydroxamic Acid

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2005年第6期23卷 678-684页

作者：李建章李鸿波冯发美谢家庆李慎新周波秦圣英 DepartmentofChemistry SichuanUniversityofScienceandEngineeringZigongSichuan643000China DepartmentofChemistry SichuanUniversityChengduSichuan610064China

Two polyether bridged dihydroxamic acids and their mono‐ and binuclear manganese(II), zinc(II) complexes have been synthesized and employed as models to mimic hydrolase in catalytic hydrolysis of p ‐nitrophenyl picolinate (PNPP). The reaction kinetics and the mechanism of hydrolysis of PNPP have been investigated. The kinetic mathematical model for PNPP cleaved by the complexes has been proposed. The effects of the different central metal ion, mono‐ and binuclear metal, the pseudo‐macrocyclic polyether constructed by polyethoxy group of the complexes, and reactive temperature on the rate for catalytic hydrolysis of PNPP have been examined. The results showed that the transition metal dihydroxamates exhibited high catalytic activity to the hydrolysis of PNPP, the catalytic activity of binuclear complexes was higher than that of mononuclear ones, and the pseudo‐macrocyclic polyether might synergetically activate H 2 O coordinated to metal ion with central metal ion together and promote the catalytic hydrolysis of PNPP.

关键词： dihydroxamic acid transition metal complex mimic hydrolase catalytic kinetics p‐nitrophenyl picolinate

Studies on PNPP Hydrolysis Catalyzed by Schiff Base Cobalt（Ⅱ） Complexes Containing Benzoaza-15-crown-5

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2007年第6期25卷 765-771页

作者：胡伟王莹李建章杜娟孟祥光胡常伟曾宪诚 Department of Chemistry Sichuan University Chengdu Sichuan 610064 China Department of Chemistry Sichuan University of Science & Engineering Zigong Sichuan 643000 China

Three novel Schiff base cobalt（Ⅱ） complexes containing benzoaza-15-crown-5, CoL^1, CoL^2 and CoL^3 were synthesized and characterized, and these complexes were used in catalytic hydrolysis of carboxylic ester （PNPP, p-nitrophenyl picolinate） as mimic hydrolytic metalloenzyme. The analysis of specific absorption spectra of the hydrolytic reaction systems indicated that the catalytic hydrolysis involved the key intermediates formed by PNPP with cobalt（Ⅱ） complexes. The CoL^3 bearing the electron withdrawing group shows better catalytic activity due to its stabilization effect on active species MLS^-. The catalytic mechanism of PNPP hydrolysis was also proposed. The kinetic parameter of PNPP catalytic hydrolysis has been calculated and the activation energy for the catalytic hydrolysis is 43.69, 39.76 and 35.44 kJ·mol^-1, respectively.

关键词： crowned Schiff base cobalt(Ⅱ) complex mimic hydrolase catalytic kinetics carboxylic ester hydrolysis