A series of MnO_(x)/N-doped carbon/MnO_(2)composites with high nitrogen amounts,namely MnO_(x)/NC/MnO_(2),was successfully fabricated.These composites were synthesized by soaking the thermally decomposed products of M...A series of MnO_(x)/N-doped carbon/MnO_(2)composites with high nitrogen amounts,namely MnO_(x)/NC/MnO_(2),was successfully fabricated.These composites were synthesized by soaking the thermally decomposed products of Mn-MOF precursors in potassium permanganate solutions of different concentrations.The Mn-MOF precursors were constructed from the coordination of N-rich linker,3-amino-1H-1,2,4-triazole-5-carboxylic acid(HATC)or pyrazine-2,3-dicarboxylic acid(H_(2)PDA)with Mn(II)ions.The assynthesized composites,particularly the samples with moderate carbon/nitrogen ratios(6.76 and 1.84 for C1-and C_(2)-based composites,respectively,)showed excellent rate capabilities,low series resistances and charge-transfer resistances as well as superior long-term cycling stabilities(more than 88%after 5000 unceasing cycles).This enhancement should be attributed to the inter-effect relationship among carbon,nitrogen and the MnO_(2)layer,which gives rise to a superior synergistic-effect in minimizing ionic and electronic transmission distances,resulting in better performances.展开更多
Supercapacitors are highly sought after by the expanding new energy industry owing to their advantages of high power and long life.However,porous carbon,a crucial electrode material,is extremely expensive.As a result,...Supercapacitors are highly sought after by the expanding new energy industry owing to their advantages of high power and long life.However,porous carbon,a crucial electrode material,is extremely expensive.As a result,the supercapacitor manufacturing industry has developed a strong demand for a new,lowcost method for synthesizing capacitor carbon.This study reports for the first time a novel method for producing high-performance capacitive carbon from ultra-low-cost raw materials CaCO_(3)(the primary stone component)and CaC_(2)(also referred to as electrical stone),which is accomplished via ball milling the two materials to facilitate a solid-solid inorganic chemical reaction.The specific surface area attained by this approach reaches 1000 m^(2) g^(-1) because of the template function of CaO generated in situ during the reaction,which is the highest value reported to date for CaC_(2)-derived carbon.The as-prepared capacitive carbon performed well in both aqueous and organic electrolytes,with a coulombic efficiency of approximately 100%.It outperforms the commercial capacitive carbon YP50F,even when prepared on a kilogram scale.This advancement dramatically reduces the cost associated with the large-scale production of porous carbon for supercapacitors,thus establishing a long-term relationship between carbon neutrality and clean energy development.展开更多
基金supported by the Qing Lan Project of Jiangsu Province,the Natural Science Foundation of Jiangsu Province(BK20180514,BK20131314)the National Natural Science Foundation of China(21371098)+1 种基金the China Postdoctoral Science Foundation(2015M570430),the Jiangsu Postdoctoral Science Foundation(1401007C)the Scientific Research Foundation of Nanjing Agricultural University(050804087).
文摘A series of MnO_(x)/N-doped carbon/MnO_(2)composites with high nitrogen amounts,namely MnO_(x)/NC/MnO_(2),was successfully fabricated.These composites were synthesized by soaking the thermally decomposed products of Mn-MOF precursors in potassium permanganate solutions of different concentrations.The Mn-MOF precursors were constructed from the coordination of N-rich linker,3-amino-1H-1,2,4-triazole-5-carboxylic acid(HATC)or pyrazine-2,3-dicarboxylic acid(H_(2)PDA)with Mn(II)ions.The assynthesized composites,particularly the samples with moderate carbon/nitrogen ratios(6.76 and 1.84 for C1-and C_(2)-based composites,respectively,)showed excellent rate capabilities,low series resistances and charge-transfer resistances as well as superior long-term cycling stabilities(more than 88%after 5000 unceasing cycles).This enhancement should be attributed to the inter-effect relationship among carbon,nitrogen and the MnO_(2)layer,which gives rise to a superior synergistic-effect in minimizing ionic and electronic transmission distances,resulting in better performances.
基金financially supported by Key Research and Development Program of Zhenjiang City(CG2023004)National Natural Science Foundation of China(22379055,21975109,52075224)Qinglan Project of Jiangsu Province of China.
文摘Supercapacitors are highly sought after by the expanding new energy industry owing to their advantages of high power and long life.However,porous carbon,a crucial electrode material,is extremely expensive.As a result,the supercapacitor manufacturing industry has developed a strong demand for a new,lowcost method for synthesizing capacitor carbon.This study reports for the first time a novel method for producing high-performance capacitive carbon from ultra-low-cost raw materials CaCO_(3)(the primary stone component)and CaC_(2)(also referred to as electrical stone),which is accomplished via ball milling the two materials to facilitate a solid-solid inorganic chemical reaction.The specific surface area attained by this approach reaches 1000 m^(2) g^(-1) because of the template function of CaO generated in situ during the reaction,which is the highest value reported to date for CaC_(2)-derived carbon.The as-prepared capacitive carbon performed well in both aqueous and organic electrolytes,with a coulombic efficiency of approximately 100%.It outperforms the commercial capacitive carbon YP50F,even when prepared on a kilogram scale.This advancement dramatically reduces the cost associated with the large-scale production of porous carbon for supercapacitors,thus establishing a long-term relationship between carbon neutrality and clean energy development.
