Flexible electrodes with superior mechanical and electrochemical properties are essential for flexible supercapacitors.A convenient and scalable colloidal film-assisted chemical vapor deposition(CF-CVD)method is devel...Flexible electrodes with superior mechanical and electrochemical properties are essential for flexible supercapacitors.A convenient and scalable colloidal film-assisted chemical vapor deposition(CF-CVD)method is developed for the one-step fabrication of the carbon microspheres films composed of carbon nano-onions(CMS-CNO films).The influence of growth conditions(such as growth temperature,time,and gas ratio)during CF-CVD process on the carbon structures and the growth mechanism of the CMS-CNO films have been investigated.By controlling the growth conditions,the controllable preparation of CMS-CNO films is realized.Such binder-free films can be used for the assembly of flexible supercapacitors,and unique architecture can achieve excellent performance.Benefitting from the composite of nano-micro zero dimensional structures,the performance of the film in supercapacitors is remarkably improved.At the current density of 5 mA cm^(-2),the area-specific capacity can be 903 mF cm^(-2).When the current density is increased to 500 mA cm^(-2),the area-specific capacity can be increased to 729 mF cm^(-2).This simple and low-cost preparation process and the superb electrochemical performance suggest great potential applications of CMS-CNO films in flexible supercapacitors.展开更多
Three types of carbon nano-onions(CNOs) including Ni@CNOs.Fe_3C@CNOs and Fe_(0.64)Ni_(0.36)@CNOs nanoparticles have been synthesized by catalytic decomposition of methane at 850 ℃ using nickel,iron and iron-nickel al...Three types of carbon nano-onions(CNOs) including Ni@CNOs.Fe_3C@CNOs and Fe_(0.64)Ni_(0.36)@CNOs nanoparticles have been synthesized by catalytic decomposition of methane at 850 ℃ using nickel,iron and iron-nickel alloy catalysts.Comparative and systematic studies have been carried out on the morphology,structural characteristics and graphitic crystallinity of these CNOs products.Furthermore,the electrochemical hydrogen storage properties of three types of CNOs have been investigated.Measurements show that the Ni@CNOs have the highest discharge capacity of 387.2 mAh/g,coiTesponding to a hydrogen storage of 1.42%.This comparison study shows the advantages of each catalyst in the growth of CNOs.enabling the controllable synthesis and tuning the properties of CNOs by mediating different metals and their alloy for using in the fuel cell system.展开更多
The search for new fluorescent molecules for possible applications as functional p-electron systems and their conjugation with different nanomaterials is nowadays of paramount importance to broaden the availability of...The search for new fluorescent molecules for possible applications as functional p-electron systems and their conjugation with different nanomaterials is nowadays of paramount importance to broaden the availability of materials with different properties.Herein we present a diversity-oriented approach to heterocyclic luminophores based on a multicomponent Ugi reaction followed by a Pd-mediated cascade sequence.The new molecules are coupled to carbon nano-onions,and hybrid systems represent the first example of blue emitters conjugated with these carbon nanoparticles.展开更多
基金the Tianjin Science and Technology Project(18PTZWHZ000,2019JCQNJC05600)the Science&Technology Development Fund of Tianjin Education Commission for Higher Education(2019KJ092)the Doctor Foundation(043135202-XB1709)of Tianjin Normal University.
文摘Flexible electrodes with superior mechanical and electrochemical properties are essential for flexible supercapacitors.A convenient and scalable colloidal film-assisted chemical vapor deposition(CF-CVD)method is developed for the one-step fabrication of the carbon microspheres films composed of carbon nano-onions(CMS-CNO films).The influence of growth conditions(such as growth temperature,time,and gas ratio)during CF-CVD process on the carbon structures and the growth mechanism of the CMS-CNO films have been investigated.By controlling the growth conditions,the controllable preparation of CMS-CNO films is realized.Such binder-free films can be used for the assembly of flexible supercapacitors,and unique architecture can achieve excellent performance.Benefitting from the composite of nano-micro zero dimensional structures,the performance of the film in supercapacitors is remarkably improved.At the current density of 5 mA cm^(-2),the area-specific capacity can be 903 mF cm^(-2).When the current density is increased to 500 mA cm^(-2),the area-specific capacity can be increased to 729 mF cm^(-2).This simple and low-cost preparation process and the superb electrochemical performance suggest great potential applications of CMS-CNO films in flexible supercapacitors.
基金supported by the National Natural Science Foundation of China(51272173,51002188)the National Basic Research Program of China(2010CB934703)Tianjin Municipal Science and Technology Commission(12ZCZDGX00800)
文摘Three types of carbon nano-onions(CNOs) including Ni@CNOs.Fe_3C@CNOs and Fe_(0.64)Ni_(0.36)@CNOs nanoparticles have been synthesized by catalytic decomposition of methane at 850 ℃ using nickel,iron and iron-nickel alloy catalysts.Comparative and systematic studies have been carried out on the morphology,structural characteristics and graphitic crystallinity of these CNOs products.Furthermore,the electrochemical hydrogen storage properties of three types of CNOs have been investigated.Measurements show that the Ni@CNOs have the highest discharge capacity of 387.2 mAh/g,coiTesponding to a hydrogen storage of 1.42%.This comparison study shows the advantages of each catalyst in the growth of CNOs.enabling the controllable synthesis and tuning the properties of CNOs by mediating different metals and their alloy for using in the fuel cell system.
基金Istituto Italiano di Tecnologia and the University of Genova are gratefully acknowledged for financial supportthe COST Action CA 15107“Multi-Functional Nano-Carbon Composite Materials Network(MultiComp)”。
文摘The search for new fluorescent molecules for possible applications as functional p-electron systems and their conjugation with different nanomaterials is nowadays of paramount importance to broaden the availability of materials with different properties.Herein we present a diversity-oriented approach to heterocyclic luminophores based on a multicomponent Ugi reaction followed by a Pd-mediated cascade sequence.The new molecules are coupled to carbon nano-onions,and hybrid systems represent the first example of blue emitters conjugated with these carbon nanoparticles.
基金The authors acknowledge the finance support by the National Natural Science Foundation of China （Nos. 51531004 and 51272173） and Foundation for SinoEuro Cooperative Project from Chinese Ministry of Science and Technology （No. SQ2013ZOA100006）. The authors also acknowledge helpful discussion with Dr. Jiancan Yu in Nanyang Technological University in Singapore.
