以CoCl2·6H2O和CS(NH2)2为水热前驱物,在不同pH值下制备了CoS2粒子,对CoS2的物相组成、微观形貌、热稳定性和正极材料电化学性能进行表征和测试。结果表明,CoS2粒子在酸性和碱性溶液中形核生长机制不同,当pH=5和pH=10时分别获得黄...以CoCl2·6H2O和CS(NH2)2为水热前驱物,在不同pH值下制备了CoS2粒子,对CoS2的物相组成、微观形貌、热稳定性和正极材料电化学性能进行表征和测试。结果表明,CoS2粒子在酸性和碱性溶液中形核生长机制不同,当pH=5和pH=10时分别获得黄铁矿结构CoS2粒子其形貌为类球形和不规则块状,对应热分解温度为650℃和610℃。在100 m A/cm2放电时,两种形貌CoS2正极材料的电化学性能基本相近;800 m A/cm2放电时,类球形CoS2放电比容量较块状CoS2高9.65%,并具有优于后者的高初始放电电压及低内阻特性。展开更多
A promising anode material composed of SnS_2@CoS_2 flower-like spheres assembled from SnS_2 nanosheets and CoS_2 nanoparticles accompanied by reduced graphene oxide(rGO) was fabricated by a facile hydrothermal pathway...A promising anode material composed of SnS_2@CoS_2 flower-like spheres assembled from SnS_2 nanosheets and CoS_2 nanoparticles accompanied by reduced graphene oxide(rGO) was fabricated by a facile hydrothermal pathway. The presence of rGO and the combined merits of SnS_2 and CoS_2 endow the SnS_2@-CoS_2–rGO composite with high conductivity pathways and channels for electrons and with excellent properties as an anode material for sodium-ion batteries(SIBs). A high capacity of 514.0 mAh g^(-1) at a current density of200 m A g^(-1) after 100 cycles and a good rate capability can be delivered. The defined structure and good sodium-storage performance of the SnS_2@CoS_2–rGO composite demonstrate its promising application in high-performance SIBs.展开更多
通过溶剂挥发诱导自组装和硫化、磷化处理合成具有多孔结构的CoS2和CoP催化剂,采用X-射线衍射、扫描电子显微镜等表征方法对材料的晶体结构和形貌进行分析。将这2种材料用于析氧反应的催化剂,结果表明,当电流密度达到10 m A/cm2时,2种...通过溶剂挥发诱导自组装和硫化、磷化处理合成具有多孔结构的CoS2和CoP催化剂,采用X-射线衍射、扫描电子显微镜等表征方法对材料的晶体结构和形貌进行分析。将这2种材料用于析氧反应的催化剂,结果表明,当电流密度达到10 m A/cm2时,2种催化剂均需要较小过电位。CoS2和CoP催化剂相应的塔菲尔曲线显示其斜率值较小,分别为78 m V/dec和77 m V/dec,说明这2种催化剂在析氧催化反应过程中表现出优异的催化性能和很好的析氧反应动力性能。展开更多
文摘以CoCl2·6H2O和CS(NH2)2为水热前驱物,在不同pH值下制备了CoS2粒子,对CoS2的物相组成、微观形貌、热稳定性和正极材料电化学性能进行表征和测试。结果表明,CoS2粒子在酸性和碱性溶液中形核生长机制不同,当pH=5和pH=10时分别获得黄铁矿结构CoS2粒子其形貌为类球形和不规则块状,对应热分解温度为650℃和610℃。在100 m A/cm2放电时,两种形貌CoS2正极材料的电化学性能基本相近;800 m A/cm2放电时,类球形CoS2放电比容量较块状CoS2高9.65%,并具有优于后者的高初始放电电压及低内阻特性。
基金supported by National Nature Science Foundation of China (11674187, 11604172, and 11504192)Program of Science and Technology in Qingdao City (165-1-2-jch)China Postdoctoral Science Foundation (2015M570570, and 2017M622138)
文摘A promising anode material composed of SnS_2@CoS_2 flower-like spheres assembled from SnS_2 nanosheets and CoS_2 nanoparticles accompanied by reduced graphene oxide(rGO) was fabricated by a facile hydrothermal pathway. The presence of rGO and the combined merits of SnS_2 and CoS_2 endow the SnS_2@-CoS_2–rGO composite with high conductivity pathways and channels for electrons and with excellent properties as an anode material for sodium-ion batteries(SIBs). A high capacity of 514.0 mAh g^(-1) at a current density of200 m A g^(-1) after 100 cycles and a good rate capability can be delivered. The defined structure and good sodium-storage performance of the SnS_2@CoS_2–rGO composite demonstrate its promising application in high-performance SIBs.
文摘通过溶剂挥发诱导自组装和硫化、磷化处理合成具有多孔结构的CoS2和CoP催化剂,采用X-射线衍射、扫描电子显微镜等表征方法对材料的晶体结构和形貌进行分析。将这2种材料用于析氧反应的催化剂,结果表明,当电流密度达到10 m A/cm2时,2种催化剂均需要较小过电位。CoS2和CoP催化剂相应的塔菲尔曲线显示其斜率值较小,分别为78 m V/dec和77 m V/dec,说明这2种催化剂在析氧催化反应过程中表现出优异的催化性能和很好的析氧反应动力性能。
