Synthesis and applications of three-dimensional(3 D)porous graphene frameworks(GFs)have attracted extensive interest owing to their intriguing advantages of high specific surface area,enriched porosity,excellent elect...Synthesis and applications of three-dimensional(3 D)porous graphene frameworks(GFs)have attracted extensive interest owing to their intriguing advantages of high specific surface area,enriched porosity,excellent electrical conductivity,exceptional compressibility and processability.However,it is still challenging for economically viable,fast and scalable assembly of 3 D GFs at room-temperature.Herein,we reported a one-step scalable strategy for fast self-assembly of graphene oxide into 3 D macroscopically porous GFs,with assistance of polyoxometalates(POM)as functional cross-linker and hydrazine hydrate as reductant at room-temperature.The resulting 3 D interconnected macroporous POM-GFs uniformly decorated with ultrasmall POM nanoclusters were directly processed into binder-/additive-free film compact electrodes(1.68 g cm^(-3))with highly aligned,layer-stacked structure and electrically conductivity(622 S m-1)for high-performance supercapacitors,showing an impressive gravimetric capacitance of205 F g-1,volumetric capacitance of 334 F cm^(-3) at 1 mV s^(-1),and remarkable cycling stability with capacitance retention of 83%after 10,000 cycles,outperforming the most reported GFs.Further,the solid-state supercapacitors offered excellent gravimetric capacitance of 157 F g-1 exceptionally volumetric capacitance of 115 F cm^(-3) at 2 mV s^(-1) based on single electrode,and volumetric energy density of2.6 mWh cm^(-3).Therefore,this work will open novel opportunities to room-temperature fast assembly of 3 D porous graphene architectures for high-energy-density supercapacitors.展开更多
Knowledge reuse is a process for designing new product based on the embedded design knowledge and experience of existing products. In order to improve quality and efficiency of product design, a method to extract rela...Knowledge reuse is a process for designing new product based on the embedded design knowledge and experience of existing products. In order to improve quality and efficiency of product design, a method to extract related knowledge from using standard parts in product design is introduced. Based on the characteristics of standard parts and their application, knowledge reusable standard parts library was built up through analysis of key techniques of standard part modeling such as knowledge expression, knowledge reuse and knowledge searching.展开更多
基金financially supported by the National Key R@D Program of China(Grants 2016YFB0100100,2016YFA0200200)the National Natural Science Foundation of China(Grant Nos.51872283,22075279,21805273,22005297,22005298)+7 种基金the Liao Ning Revitalization Talents Program(Grant XLYC1807153)the Natural Science Foundation of Liaoning ProvinceJoint Research Fund Liaoning-Shenyang National Laboratory for Materials Science(Grant 20180510038)Dalian Innovation Support Plan for High Level Talents(2019RT09)the Dalian National Laboratory For Clean Energy(DNL),CASDNL Cooperation Fund,CAS(DNL180310,DNL180308,DNL201912,and DNL201915)DICP(DICP ZZBS201708,DICP ZZBS201802,DICP I2020032)the China Postdoctoral Science Foundation(2019M661141,2020M680995)。
文摘Synthesis and applications of three-dimensional(3 D)porous graphene frameworks(GFs)have attracted extensive interest owing to their intriguing advantages of high specific surface area,enriched porosity,excellent electrical conductivity,exceptional compressibility and processability.However,it is still challenging for economically viable,fast and scalable assembly of 3 D GFs at room-temperature.Herein,we reported a one-step scalable strategy for fast self-assembly of graphene oxide into 3 D macroscopically porous GFs,with assistance of polyoxometalates(POM)as functional cross-linker and hydrazine hydrate as reductant at room-temperature.The resulting 3 D interconnected macroporous POM-GFs uniformly decorated with ultrasmall POM nanoclusters were directly processed into binder-/additive-free film compact electrodes(1.68 g cm^(-3))with highly aligned,layer-stacked structure and electrically conductivity(622 S m-1)for high-performance supercapacitors,showing an impressive gravimetric capacitance of205 F g-1,volumetric capacitance of 334 F cm^(-3) at 1 mV s^(-1),and remarkable cycling stability with capacitance retention of 83%after 10,000 cycles,outperforming the most reported GFs.Further,the solid-state supercapacitors offered excellent gravimetric capacitance of 157 F g-1 exceptionally volumetric capacitance of 115 F cm^(-3) at 2 mV s^(-1) based on single electrode,and volumetric energy density of2.6 mWh cm^(-3).Therefore,this work will open novel opportunities to room-temperature fast assembly of 3 D porous graphene architectures for high-energy-density supercapacitors.
基金National Scientific and Technological Support Plan (2006BAF01A43)
文摘Knowledge reuse is a process for designing new product based on the embedded design knowledge and experience of existing products. In order to improve quality and efficiency of product design, a method to extract related knowledge from using standard parts in product design is introduced. Based on the characteristics of standard parts and their application, knowledge reusable standard parts library was built up through analysis of key techniques of standard part modeling such as knowledge expression, knowledge reuse and knowledge searching.
