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
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.
