采用水热合成法制备了二氧化锰/二氧化钛/介孔碳复合材料,利用该复合材料制备了空气电极。通过X射线衍射仪(XRD)分析了复合材料的物相,用扫描电子显微镜(SEM)观察了复合材料的表面形貌,采用循环伏安法研究了空气电极的电化学性能。结果...采用水热合成法制备了二氧化锰/二氧化钛/介孔碳复合材料,利用该复合材料制备了空气电极。通过X射线衍射仪(XRD)分析了复合材料的物相,用扫描电子显微镜(SEM)观察了复合材料的表面形貌,采用循环伏安法研究了空气电极的电化学性能。结果表明:在160℃条件下制备的复合材料结晶度更高,循环伏安测试表明空气电极可逆性较好。利用复合材料组装了锂空气电池,对其进行充放电测试,发现锂空气电池首次放电容量最高可达1 331 m Ah/g。展开更多
Co-doped perovskite oxide La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0, 0.2, 0.4) composites are prepared by sol-gel method utilizing citric acid as chelating agent. These composites show good catalytic activities when tested ...Co-doped perovskite oxide La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0, 0.2, 0.4) composites are prepared by sol-gel method utilizing citric acid as chelating agent. These composites show good catalytic activities when tested as catalysts rechargeable lithium-air batteries. In particular, the La_(0.4)Sr_(0.6)Co_(0.4)Mn_(0.6)O_3 shows a lower potential gap. When these samples are tested as catalysts for Li-air batteries at a current density of100 mA g^(-1), the discharge capacities with different La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0,0.2, 0.4) catalysts are 5819, 6420, and 7227 mA h g^(-1),respectively. In addition, under a capacity limitation of 1000 mA h g^(-1), the cell using La_(0.4)Sr_(0.6)Co_(0.4)Mn_(0.6)O_3 as catalyst shows good cycling stability up to 46 cycles. The good electrochemical performance suggests that suitable doping of Co in Mn site of La_(0.4)Sr_(0.6)MnO_3 could be a promising route to improve the catalytic activity.展开更多
以金属有机框架-74为模板制备了仿锤体状Co_(3)O_(4),然后与单质Ag复合,通过界面工程提高了材料电导率,制备出Li-O_(2)电池的高活性催化剂Ag/Co_(3)O_(4)。在100 m A/g电流密度,使用Ag/Co_(3)O_(4)催化剂的Li-O_(2)电池的放电比容量达到...以金属有机框架-74为模板制备了仿锤体状Co_(3)O_(4),然后与单质Ag复合,通过界面工程提高了材料电导率,制备出Li-O_(2)电池的高活性催化剂Ag/Co_(3)O_(4)。在100 m A/g电流密度,使用Ag/Co_(3)O_(4)催化剂的Li-O_(2)电池的放电比容量达到了13945 m A·h/g,即使在1000 m A/g高电流密度,依然可以保持4476.3 m A·h/g的放电比容量,证明其具有出色的倍率性能。同时,循环性能也得到了大幅提高,在电流密度为500 m A/g,限制比容量为1000 m A·h/g,使用Ag/Co_(3)O_(4)催化剂的电池可以稳定循环195圈,而使用Co_(3)O_(4)催化剂的电池只能循环42圈。展开更多
文摘采用水热合成法制备了二氧化锰/二氧化钛/介孔碳复合材料,利用该复合材料制备了空气电极。通过X射线衍射仪(XRD)分析了复合材料的物相,用扫描电子显微镜(SEM)观察了复合材料的表面形貌,采用循环伏安法研究了空气电极的电化学性能。结果表明:在160℃条件下制备的复合材料结晶度更高,循环伏安测试表明空气电极可逆性较好。利用复合材料组装了锂空气电池,对其进行充放电测试,发现锂空气电池首次放电容量最高可达1 331 m Ah/g。
文摘Co-doped perovskite oxide La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0, 0.2, 0.4) composites are prepared by sol-gel method utilizing citric acid as chelating agent. These composites show good catalytic activities when tested as catalysts rechargeable lithium-air batteries. In particular, the La_(0.4)Sr_(0.6)Co_(0.4)Mn_(0.6)O_3 shows a lower potential gap. When these samples are tested as catalysts for Li-air batteries at a current density of100 mA g^(-1), the discharge capacities with different La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0,0.2, 0.4) catalysts are 5819, 6420, and 7227 mA h g^(-1),respectively. In addition, under a capacity limitation of 1000 mA h g^(-1), the cell using La_(0.4)Sr_(0.6)Co_(0.4)Mn_(0.6)O_3 as catalyst shows good cycling stability up to 46 cycles. The good electrochemical performance suggests that suitable doping of Co in Mn site of La_(0.4)Sr_(0.6)MnO_3 could be a promising route to improve the catalytic activity.
文摘以金属有机框架-74为模板制备了仿锤体状Co_(3)O_(4),然后与单质Ag复合,通过界面工程提高了材料电导率,制备出Li-O_(2)电池的高活性催化剂Ag/Co_(3)O_(4)。在100 m A/g电流密度,使用Ag/Co_(3)O_(4)催化剂的Li-O_(2)电池的放电比容量达到了13945 m A·h/g,即使在1000 m A/g高电流密度,依然可以保持4476.3 m A·h/g的放电比容量,证明其具有出色的倍率性能。同时,循环性能也得到了大幅提高,在电流密度为500 m A/g,限制比容量为1000 m A·h/g,使用Ag/Co_(3)O_(4)催化剂的电池可以稳定循环195圈,而使用Co_(3)O_(4)催化剂的电池只能循环42圈。
