硬炭凭借较高的储钠容量、低电压平台以及优异的循环稳定性成为了钠离子电池(SIBs)最具应用潜力的负极材料。硬炭材料的微观孔隙结构是影响其储钠性能的关键因素之一,合理调控硬炭材料的孔隙结构大小及分布对提升钠离子电池性能至关重...硬炭凭借较高的储钠容量、低电压平台以及优异的循环稳定性成为了钠离子电池(SIBs)最具应用潜力的负极材料。硬炭材料的微观孔隙结构是影响其储钠性能的关键因素之一,合理调控硬炭材料的孔隙结构大小及分布对提升钠离子电池性能至关重要。本文以β-环糊精为碳源,采用NaCl辅助水热法制备了一系列具有不同微观孔隙结构的硬炭材料,考察了NaCl浓度对硬炭微观孔隙结构的影响,研究了硬炭材料的储纳性能。采用非原位X射线衍射仪、拉曼光谱仪及高倍率透射电镜等进行表征,结果表明,调控NaCl浓度能够优化硬炭材料的孔隙结构,提升硬炭材料闭孔体积。当NaCl浓度为2mol L^(-1)时,制备的硬炭材料(CD-2)的无序程度与石墨微晶尺寸最大,具有最大的闭孔体积与梯度孔隙结构。电化学测试表明,在0.02Ag^(-1)的电流密度下,CD-2硬炭材料具有360 mA hg^(-1)的高储钠比容量及90.2%的首次库伦效率。提出的NaCl辅助水热炭化调控硬炭闭孔结构的策略,为硬炭材料孔隙结构的合理设计提供了有效的技术方法,指导了高性能SIBs硬炭负极材料的开发。展开更多
The reaction of Mg^(2+)and 5-{1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl}terephthalic acid(H_(2)L)leads to two metal-organic frameworks,[Mg(L)(DMF)_(2)(H_(2)O)_(2)]_(2)·5DMF·2H_(2)O(1)with a 1D structure and...The reaction of Mg^(2+)and 5-{1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl}terephthalic acid(H_(2)L)leads to two metal-organic frameworks,[Mg(L)(DMF)_(2)(H_(2)O)_(2)]_(2)·5DMF·2H_(2)O(1)with a 1D structure and[Mg_(2)(L)_(2)(DMSO)_(3)(H_(2)O)](2)with a 2D(4,4)-net structure.Interestingly,the two compounds exhibit distinct luminescent responses to external mechanical stimuli.1 exhibited exceptional resistance mechanical chromic luminescence(RMCL),which can be attributed to the predominant hydrogen bonds and the presence of high-boiling-point solvent molecules within its structure.2 had a reversible MCL property,which can be attributed to the dominantπ-πweak interactions,coupled with the reversible destruction/restoration of its crystallinity under grinding/fumigation.CCDC:2410963,1;2410964,2.展开更多
For rechargeable aqueous zinc-ion batteries(ZIBs),the design of nanocomposites comprised of electrochemically active materials and carbon materials with novel structures has great prom-ise in addressing the issue of e...For rechargeable aqueous zinc-ion batteries(ZIBs),the design of nanocomposites comprised of electrochemically active materials and carbon materials with novel structures has great prom-ise in addressing the issue of electrical conductivity and structural stability in the electrode materials during electrochemical cycling.We report the production of a novel flexible electrode material,by anchoring MnO_(2) nanosheets on a B,N co-doped carbon nanotube ar-ray(BNCNTs)grown on carbon cloth(BNCNTs@MnO_(2)),which was fabricated by in-situ pyrolysis and hydrothermal growth.The generated BNCNTs were strongly bonded to the surface of the car-bon fibers in the carbon cloth which provides both excellent elec-tron transport and ion diffusion,and improves the stability and dur-ability of the cathode.Importantly,the BNCNTs offer more active sites for the hydrothermal growth of MnO_(2),ensuring a uniform dis-tribution.Electrochemical tests show that BNCNTs@MnO_(2) delivers a high specific capacity of 310.7 mAh g^(−1) at 0.1 A g^(−1),along with excellent rate capability and outstanding cycling stability,with a 79.7% capacity retention after 8000 cycles at 3 A g^(−1).展开更多
电化学氧化处理有机废水的过程中阳极区降解废水中的有机物,同时在阴极耦合制氢回收清洁能源。选取苯酚、葡萄糖和淀粉为研究对象,研究了相同COD浓度不同有机物的降解效果、产氢量以及他们之间的关系。研究结果表明不同有机物的降解效...电化学氧化处理有机废水的过程中阳极区降解废水中的有机物,同时在阴极耦合制氢回收清洁能源。选取苯酚、葡萄糖和淀粉为研究对象,研究了相同COD浓度不同有机物的降解效果、产氢量以及他们之间的关系。研究结果表明不同有机物的降解效果由于结构和性质的不同而不同,产氢量也随之变化。苯酚降解效果最好,产氢量和产氢速率最大。对苯酚降解动力学进一步研究表明苯酚的降解是一级动力学过程,在5 V和10 V条件下的反应平衡常数分别为0.01498 h 1和0.1202 h 1,反应速率随电压升高而增大。研究结果为不同类型的有机废水选择合理的处理工艺提供了理论依据。展开更多
文摘硬炭凭借较高的储钠容量、低电压平台以及优异的循环稳定性成为了钠离子电池(SIBs)最具应用潜力的负极材料。硬炭材料的微观孔隙结构是影响其储钠性能的关键因素之一,合理调控硬炭材料的孔隙结构大小及分布对提升钠离子电池性能至关重要。本文以β-环糊精为碳源,采用NaCl辅助水热法制备了一系列具有不同微观孔隙结构的硬炭材料,考察了NaCl浓度对硬炭微观孔隙结构的影响,研究了硬炭材料的储纳性能。采用非原位X射线衍射仪、拉曼光谱仪及高倍率透射电镜等进行表征,结果表明,调控NaCl浓度能够优化硬炭材料的孔隙结构,提升硬炭材料闭孔体积。当NaCl浓度为2mol L^(-1)时,制备的硬炭材料(CD-2)的无序程度与石墨微晶尺寸最大,具有最大的闭孔体积与梯度孔隙结构。电化学测试表明,在0.02Ag^(-1)的电流密度下,CD-2硬炭材料具有360 mA hg^(-1)的高储钠比容量及90.2%的首次库伦效率。提出的NaCl辅助水热炭化调控硬炭闭孔结构的策略,为硬炭材料孔隙结构的合理设计提供了有效的技术方法,指导了高性能SIBs硬炭负极材料的开发。
文摘The reaction of Mg^(2+)and 5-{1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl}terephthalic acid(H_(2)L)leads to two metal-organic frameworks,[Mg(L)(DMF)_(2)(H_(2)O)_(2)]_(2)·5DMF·2H_(2)O(1)with a 1D structure and[Mg_(2)(L)_(2)(DMSO)_(3)(H_(2)O)](2)with a 2D(4,4)-net structure.Interestingly,the two compounds exhibit distinct luminescent responses to external mechanical stimuli.1 exhibited exceptional resistance mechanical chromic luminescence(RMCL),which can be attributed to the predominant hydrogen bonds and the presence of high-boiling-point solvent molecules within its structure.2 had a reversible MCL property,which can be attributed to the dominantπ-πweak interactions,coupled with the reversible destruction/restoration of its crystallinity under grinding/fumigation.CCDC:2410963,1;2410964,2.
基金financial support from projects funded by the National Natural Science Foundation of China(52172038,22179017)the National Key Research and Development Program of China(2022YFB4101600,2022YFB4101601)。
文摘For rechargeable aqueous zinc-ion batteries(ZIBs),the design of nanocomposites comprised of electrochemically active materials and carbon materials with novel structures has great prom-ise in addressing the issue of electrical conductivity and structural stability in the electrode materials during electrochemical cycling.We report the production of a novel flexible electrode material,by anchoring MnO_(2) nanosheets on a B,N co-doped carbon nanotube ar-ray(BNCNTs)grown on carbon cloth(BNCNTs@MnO_(2)),which was fabricated by in-situ pyrolysis and hydrothermal growth.The generated BNCNTs were strongly bonded to the surface of the car-bon fibers in the carbon cloth which provides both excellent elec-tron transport and ion diffusion,and improves the stability and dur-ability of the cathode.Importantly,the BNCNTs offer more active sites for the hydrothermal growth of MnO_(2),ensuring a uniform dis-tribution.Electrochemical tests show that BNCNTs@MnO_(2) delivers a high specific capacity of 310.7 mAh g^(−1) at 0.1 A g^(−1),along with excellent rate capability and outstanding cycling stability,with a 79.7% capacity retention after 8000 cycles at 3 A g^(−1).
文摘电化学氧化处理有机废水的过程中阳极区降解废水中的有机物,同时在阴极耦合制氢回收清洁能源。选取苯酚、葡萄糖和淀粉为研究对象,研究了相同COD浓度不同有机物的降解效果、产氢量以及他们之间的关系。研究结果表明不同有机物的降解效果由于结构和性质的不同而不同,产氢量也随之变化。苯酚降解效果最好,产氢量和产氢速率最大。对苯酚降解动力学进一步研究表明苯酚的降解是一级动力学过程,在5 V和10 V条件下的反应平衡常数分别为0.01498 h 1和0.1202 h 1,反应速率随电压升高而增大。研究结果为不同类型的有机废水选择合理的处理工艺提供了理论依据。
