本文根据普通高等学校招生全国统一考试英语科考试说明中对概要写作所提出的要求,通过调查高中生在概要写作时所存在的问题,根据语言学的输入输出理论,同时结合多年积累的教学经验,在教学实践中不断探索,以The Return of the Milu Deer...本文根据普通高等学校招生全国统一考试英语科考试说明中对概要写作所提出的要求,通过调查高中生在概要写作时所存在的问题,根据语言学的输入输出理论,同时结合多年积累的教学经验,在教学实践中不断探索,以The Return of the Milu Deer 一课为例,总结出概要写作的有效课堂教学.展开更多
Developing methods to construct conjugated microporous polymers(CMPs)with desirable structures is a crucial undertaking.However,obtaining azo-CMPs with extended azaacene cores is immensely challenging.Herein,we disclo...Developing methods to construct conjugated microporous polymers(CMPs)with desirable structures is a crucial undertaking.However,obtaining azo-CMPs with extended azaacene cores is immensely challenging.Herein,we disclose the facile synthesis of diquinoxalino[2,3-a:2',3'-c]-phenazine-core CMP(3Qn-CMP;core diameter,∼1.6 nm)via the one-step hydrothermal homocoupling of nitro monomers in a mixture solution of N,N-dimethylformamide(or N,N-dimethylacetamide)and water(1:3,v/v).A 3Qn-CMP/rGO hybrid is readily prepared from CMP spheres(diameter,0.5-1.5µm)anchored on reduced graphene oxide(rGO)nanosheets(∼3 layers)by synergizing the one-pot synthesis of(rGO)for intercalation and self-assembly.The highly porous hybrid features dual redox active sites with azo and imine linkages and efficient charge conduction.3Qn-CMP and 3Qn-CMP/rGO exhibit outstanding energy storage capacity,current density tolerance(1-50 A g^(−1)),and long-term cycling stability in aqueous acidic electrolytes.3Qn-CMP and 3Qn-CMP/rGO also produce high specific capacitances of 615.4 and 847.8 F g^(−1),respectively,at 1 A g^(−1).Approximately 99.1%of this capacitance can be retained over 50,000 continuous charge/discharge cycles at 50 A g^(−1).To the best of our knowledge,our hybrid outperforms most organic molecules or CMP-/rGO-based composites reported in the literature in terms of capacitance and cycling durability.This work provides a general strategy to access a new library of CMPs and hybrids with multilevel elaborate architectures tailored for target applications,such as electrochemical energy storage and catalysis.展开更多
基金supported by the National Natural Science Foundation of China(51861145401,21905136)the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions。
文摘Developing methods to construct conjugated microporous polymers(CMPs)with desirable structures is a crucial undertaking.However,obtaining azo-CMPs with extended azaacene cores is immensely challenging.Herein,we disclose the facile synthesis of diquinoxalino[2,3-a:2',3'-c]-phenazine-core CMP(3Qn-CMP;core diameter,∼1.6 nm)via the one-step hydrothermal homocoupling of nitro monomers in a mixture solution of N,N-dimethylformamide(or N,N-dimethylacetamide)and water(1:3,v/v).A 3Qn-CMP/rGO hybrid is readily prepared from CMP spheres(diameter,0.5-1.5µm)anchored on reduced graphene oxide(rGO)nanosheets(∼3 layers)by synergizing the one-pot synthesis of(rGO)for intercalation and self-assembly.The highly porous hybrid features dual redox active sites with azo and imine linkages and efficient charge conduction.3Qn-CMP and 3Qn-CMP/rGO exhibit outstanding energy storage capacity,current density tolerance(1-50 A g^(−1)),and long-term cycling stability in aqueous acidic electrolytes.3Qn-CMP and 3Qn-CMP/rGO also produce high specific capacitances of 615.4 and 847.8 F g^(−1),respectively,at 1 A g^(−1).Approximately 99.1%of this capacitance can be retained over 50,000 continuous charge/discharge cycles at 50 A g^(−1).To the best of our knowledge,our hybrid outperforms most organic molecules or CMP-/rGO-based composites reported in the literature in terms of capacitance and cycling durability.This work provides a general strategy to access a new library of CMPs and hybrids with multilevel elaborate architectures tailored for target applications,such as electrochemical energy storage and catalysis.