Compared with ordinary graphite anode,SnO_(2) possesses higher theoretical specifc capacity,rich raw materials and low price.While the severe volume expansion of SnO_(2) during lithium-ion extraction/intercalation lim...Compared with ordinary graphite anode,SnO_(2) possesses higher theoretical specifc capacity,rich raw materials and low price.While the severe volume expansion of SnO_(2) during lithium-ion extraction/intercalation limits its further application.To solve this problem,in this work the reduced graphene oxide(rGO)was introduced as volume bufer matrix of SnO_(2).Herein,SnO_(2)/rGO composite is obtained through one-step hydrothermal method.Three-dimensional structure of rGO could efectively hinder the polymerization of SnO_(2) nanoparticles and provide more lithium storage sites attributed to high specifc surface area and density defects.The initial discharge capacity of the composite cathode is 959 mA·h·g^(-1) and the capacity remained at 300 mA·h·g^(-1) after 1000 cycles at 1 C.It proved that the rGO added in the anode has a capacity contribution to the lithium-ion battery.It changes the capacity contribution mechanism from difusion process dominance to surface driven capacitive contribution.Due to the addition of rGO,the anode material gains stable structure and great conductivity.展开更多
Sb-based materials have been considered one of the most promising anode electrode materials for lithium-ion batteries,whereas they were commonly synthesized through time-consuming and costly processes.Here,Sb@Sb2O3/re...Sb-based materials have been considered one of the most promising anode electrode materials for lithium-ion batteries,whereas they were commonly synthesized through time-consuming and costly processes.Here,Sb@Sb2O3/reduced graphene oxide(Sb@Sb2O3/rGO)composite was successfully synthesized by a facile one-pot chemical method at ambient temperature.Based on the XRD and TGA analysis,the mass fractions of Sb and Sb2O3 in the Sb@Sb2O3/rGO composite are ca.34.05%and 26.6%,respectively.When used as an alternative electrode for lithium ion batteries,a high reversible capacity of 790.9 mA·h/g could be delivered after 200 cycles with the capacity retention of 93.8%at a current density of 200 mA/g.And a capacity of 260 mA·h/g could be maintained even at 2000 mA/g.These excellent electrochemical properties can be attributed to its well-constructed nanostructure.The Sb and Sb2O3 particles with size of 10 nm were tightly anchored on rGO sheets through electronic coupling,which could not only alleviate the stress induced by the volume expansion,suppress the aggregation of Sb and Sb2O3 particles,but also improve the electron transfer ability during cycling.展开更多
通过还原法制备了Cu_(2)O/还原氧化石墨烯(Cu_(2)O/rGO)复合材料,采用SEM、FTIR、EDS、XRD、XPS、氮气吸附-脱附、循环伏安曲线对其结构和氧还原性能进行了表征和测试。将Cu_(2)O/rGO复合材料负载于碳布制得了Cu_(2)O/rGO阴极,以硝酸盐...通过还原法制备了Cu_(2)O/还原氧化石墨烯(Cu_(2)O/rGO)复合材料,采用SEM、FTIR、EDS、XRD、XPS、氮气吸附-脱附、循环伏安曲线对其结构和氧还原性能进行了表征和测试。将Cu_(2)O/rGO复合材料负载于碳布制得了Cu_(2)O/rGO阴极,以硝酸盐作为模型污染物,将其作为微生物燃料电池(MFC)的阴极,探究其对MFC产电脱氮性能和微生物菌落结构的影响。结果表明,Cu_(2)O/rGO复合材料具有大量的介孔结构和良好的氧还原可逆性。与Pt/C阴极相比,Cu_(2)O/rGO阴极的交换电流密度升高了47.77%,电荷转移阻抗降低了65.53%。Cu_(2)O/rGO-MFC在处理NO_(3)^(–)-N废水时平均最大输出电压为662.54 m V、最大功率密度为26.27 m W/cm^(2)、平均库仑效率为32.02%、NO_(3)^(–)-N去除速率为83.33 mg/(L·h),均高于Pt/C-MFC[485.33 m V、16.98 m W/cm^(2)、7.38%、41.67 mg/(L·h)]。Cu_(2)O/rGO-MFC阴极生物膜中反硝化关键酶活性和胞外聚合物含量增加,同时,功能性微生物Betaproteobacteria和Alphaproteobacteria纲的丰度分别较Pt/C-MFC增加了35.66%和36.96%。展开更多
基金Supported by National Natural Science Foundation of China(Grant No.61774022)Natural Science Foundation of Guangdong Province(Grant No.2022A1515011449)+2 种基金Special Program for Science Research Foundation of the Higher Education Institutions of Guangdong Providence(Grant No.2020ZDZX2052)2020 Li Ka Shing Foundation Cross-Disciplinary Research Grant(Grant No.2020LKSFG01A)Research.Start-up Foundation of Shantou University(Grant No.NTF20024).
文摘Compared with ordinary graphite anode,SnO_(2) possesses higher theoretical specifc capacity,rich raw materials and low price.While the severe volume expansion of SnO_(2) during lithium-ion extraction/intercalation limits its further application.To solve this problem,in this work the reduced graphene oxide(rGO)was introduced as volume bufer matrix of SnO_(2).Herein,SnO_(2)/rGO composite is obtained through one-step hydrothermal method.Three-dimensional structure of rGO could efectively hinder the polymerization of SnO_(2) nanoparticles and provide more lithium storage sites attributed to high specifc surface area and density defects.The initial discharge capacity of the composite cathode is 959 mA·h·g^(-1) and the capacity remained at 300 mA·h·g^(-1) after 1000 cycles at 1 C.It proved that the rGO added in the anode has a capacity contribution to the lithium-ion battery.It changes the capacity contribution mechanism from difusion process dominance to surface driven capacitive contribution.Due to the addition of rGO,the anode material gains stable structure and great conductivity.
基金Project(51462032)supported by the National Natural Science Foundation of ChinaProject(17JR5RA066)supported by the Foundation for Distinguished Young Scholars of Gansu Province,China
文摘Sb-based materials have been considered one of the most promising anode electrode materials for lithium-ion batteries,whereas they were commonly synthesized through time-consuming and costly processes.Here,Sb@Sb2O3/reduced graphene oxide(Sb@Sb2O3/rGO)composite was successfully synthesized by a facile one-pot chemical method at ambient temperature.Based on the XRD and TGA analysis,the mass fractions of Sb and Sb2O3 in the Sb@Sb2O3/rGO composite are ca.34.05%and 26.6%,respectively.When used as an alternative electrode for lithium ion batteries,a high reversible capacity of 790.9 mA·h/g could be delivered after 200 cycles with the capacity retention of 93.8%at a current density of 200 mA/g.And a capacity of 260 mA·h/g could be maintained even at 2000 mA/g.These excellent electrochemical properties can be attributed to its well-constructed nanostructure.The Sb and Sb2O3 particles with size of 10 nm were tightly anchored on rGO sheets through electronic coupling,which could not only alleviate the stress induced by the volume expansion,suppress the aggregation of Sb and Sb2O3 particles,but also improve the electron transfer ability during cycling.
文摘通过还原法制备了Cu_(2)O/还原氧化石墨烯(Cu_(2)O/rGO)复合材料,采用SEM、FTIR、EDS、XRD、XPS、氮气吸附-脱附、循环伏安曲线对其结构和氧还原性能进行了表征和测试。将Cu_(2)O/rGO复合材料负载于碳布制得了Cu_(2)O/rGO阴极,以硝酸盐作为模型污染物,将其作为微生物燃料电池(MFC)的阴极,探究其对MFC产电脱氮性能和微生物菌落结构的影响。结果表明,Cu_(2)O/rGO复合材料具有大量的介孔结构和良好的氧还原可逆性。与Pt/C阴极相比,Cu_(2)O/rGO阴极的交换电流密度升高了47.77%,电荷转移阻抗降低了65.53%。Cu_(2)O/rGO-MFC在处理NO_(3)^(–)-N废水时平均最大输出电压为662.54 m V、最大功率密度为26.27 m W/cm^(2)、平均库仑效率为32.02%、NO_(3)^(–)-N去除速率为83.33 mg/(L·h),均高于Pt/C-MFC[485.33 m V、16.98 m W/cm^(2)、7.38%、41.67 mg/(L·h)]。Cu_(2)O/rGO-MFC阴极生物膜中反硝化关键酶活性和胞外聚合物含量增加,同时,功能性微生物Betaproteobacteria和Alphaproteobacteria纲的丰度分别较Pt/C-MFC增加了35.66%和36.96%。
