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Efficient electrocatalytic CO2 reduction by crystalline polymetallophthalocyanine covalent organic frameworks unprecedentedly constructed involving 4-dimethylaminopyridine(DMAP)-type nucleophilic catalyst 认领 引用
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作者 Tao Wei Zhanpeng Liang +6 位作者 Boxin Zhang Yunhao Xu Zhaoxue Sun Minghao Duo Minghui Chen Sheng Zhang Bao Zhang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第4期319-329,共11页
Polymetallophthalocyanine covalent organic frameworks(pMPc-COFs)exhibit considerable promise in the electrocatalytic CO2 reduction reaction(CO2RR)due to their tunable active sites and excellent structural stabil... Polymetallophthalocyanine covalent organic frameworks(pMPc-COFs)exhibit considerable promise in the electrocatalytic CO2 reduction reaction(CO2RR)due to their tunable active sites and excellent structural stability.Nevertheless,preparation of crystalline pMPc-COFs under mild conditions remains a significant challenge.Herein,we developed a mild and scalable synthetic strategy,which can realize the construction of pMPc-COFs with different metals embedded.Thus,in the presence of different metal atoms(Co,Bi and Cu),the nucleophilic catalyst 4-dimethylaminopyridine(DMAP)flux-mediated formation of pMPc-COFs occurred efficiently leading to crystalline DMAP-pCoPc-COFs,DMAP-pBiPc-COFs and DMAP-pCuPc-COFs,respectively,incorporated with well-defined single-metal-atom reactive centers at a temperature of 150℃ with no other solvents required.Intriguingly,in the electrocatalytic CO2RR,as-prepared DMAP-pCoPc-COFs demonstrated remarkable CO Faradaic efficiencies above 88% and up to 91% over a wide potential range(-0.8 to-1.0 V vs.RHE).More interestingly,DMAP-pBiPc-COFs,as the first example of Bi phthalocyanine COFs to date,exhibited an encouraging formate selectivity of up to 85%,making it one of the most efficient formate electrocatalysts.The tuning of CO2RR selectivity by the center metal was further revealed from the atomic level through in-situ infrared spectroscopy technique and theoretical calculations,providing new insights for the design of efficient electrocatalysts involving pMPc-COFs. 展开更多
关键词 Covalent organic framework Synthesis method Phthalocyanine Carbon dioxide reduction reaction Electrocatalysis
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The Correlation between the Power Quality Indicators and Entropy Production Characteristics of Wind Power+Energy Storage Systems 认领 引用 被引量：3
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作者 Caifeng Wen Boxin Zhang +3 位作者 Yuanjun Dai Wenxin Wang Wanbing Xie Qian Du 《Energy Engineering》 EI 2024年第10期2961-2979,共19页
Power quality improvements help guide and solve the problems of inefficient energy production and unstable power output in wind power systems.The purpose of this paper is mainly to explore the influence of different e... Power quality improvements help guide and solve the problems of inefficient energy production and unstable power output in wind power systems.The purpose of this paper is mainly to explore the influence of different energy storage batteries on various power quality indicators by adding different energy storage devices to the simulated wind power system,and to explore the correlation between systementropy generation and various indicators,so as to provide a theoretical basis for directly improving power quality by reducing loss.A steady-state experiment was performed by replacing the wind wheel with an electric motor,and the output power qualities of the wind power systemwith andwithout energy storagewere compared and analyzed.Moreover,the improvement effect of different energy storage devices on various indicatorswas obtained.Then,based on the entropy theory,the loss of the internal components of the wind power system generator is simulated and explored by Ansys software.Through the analysis of power quality evaluation indicators,such as current harmonic distortion rate,frequency deviation rate,and voltage fluctuation,the correlation between entropy production and each evaluation indicator was explored to investigate effective methods to improve power quality by reducing entropy production.The results showed that the current harmonic distortion rate,voltage fluctuation,voltage deviation,and system entropy production are positively correlated in the tests and that the power factor is negatively correlated with system entropy production.In the frequency range,the frequency deviationwas not significantly correlated with the systementropy production. 展开更多
关键词 Wind power system entropy production system losses power quality indexes battery energy storage
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Correlation Analysis of Wind Turbine Temperature Rise and Exergy Efficiency Based on Field-Path Coupling 认领 引用 被引量：3
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作者 Caifeng Wen Qiang Wang +4 位作者 Yang Cao Liru Zhang Wenxin Wang Boxin Zhang Qian Du 《Energy Engineering》 EI 2023年第7期1603-1619,共17页
To solve the problems of large losses and low productivity of permanent magnet synchronous generators used in wind power systems,the field-circuit coupling method is used to accurately solve the electromagnetic field ... To solve the problems of large losses and low productivity of permanent magnet synchronous generators used in wind power systems,the field-circuit coupling method is used to accurately solve the electromagnetic field and temperature field of the generator.The loss distribution of the motor is accurately obtained by considering the influence of external circuit characteristics on its internal physical field.By mapping the losses to the corresponding part of the three-dimensional finite element model of the motor,the temperature field is solved,and the global temperature distribution of the generator,considering the influence of end windings,is obtained.By changing the air gap length,permanent magnet thickness,and winding conductivity,the relationship between the loss,temperature rise,and exergy efficiency can be obtained.By optimizing the air gap length,permanent magnet thickness,and winding conductivity,the best configuration and material properties can improve the efficiency of the motor by up to 4%. 展开更多
关键词 Wind turbine field-path coupling temperature rise distribution exergy efficiency
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三嗪共价骨架材料的层间位错行为及其光生载流子动力学理论研究 认领 引用 被引量：1
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作者 陈铭晖 张博心 +3 位作者 魏滔 孙兆雪 冯亚青 张宝 《化学学报》 SCIE CAS CSCD 北大核心 2025年第2期93-100,共8页
三嗪共价骨架(CTF)材料是一类由三嗪环连接构筑的结晶性二维骨架材料,于光催化领域受到了越来越多的关注.由于其特殊的二维结构,各层之间通过非化学键的方式进行堆叠形成体相结构,因此其各层之间的相互作用力较弱.在形成骨架过程以及光... 三嗪共价骨架(CTF)材料是一类由三嗪环连接构筑的结晶性二维骨架材料,于光催化领域受到了越来越多的关注.由于其特殊的二维结构,各层之间通过非化学键的方式进行堆叠形成体相结构,因此其各层之间的相互作用力较弱.在形成骨架过程以及光催化过程中可能发生堆积方式的变化.然而目前CTFs材料产生层间位错的机理尚未有所研究.因此本工作采用密度泛函方法,探究了四种三嗪骨架材料(CTF-1、CTF-2、CTF-13以及CTF-133)的层间位错行为的主要影响因素.结果表明,四种CTF发生层间位错行为的过程均为一自发行为,是由于相邻两层之间三嗪环基团中氮原子上π电子斥力造成的,而苯环单元的层间堆积能够稳定层间构型.最后,对不同堆积方式的CTF-1骨架的光生载流子动力学进行了研究,发现AA堆积的CTF-1骨架材料具有合适的带隙以及光生载流子迁移速率,是一种潜在的半导体光催化剂. 展开更多
关键词 三嗪基共价骨架材料 层间位错行为 堆积方式 密度泛函理论 半导体特性
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