反钙钛矿作为一种有潜力的新型非贵金属电催化材料,组分上不同过渡金属的填充使得反钙钛矿在析氧反应和氧还原反应表现突出,有望成为一种高效的双功能氧电催化剂。首次通过静电纺丝法结合高温煅烧法制备出碳纤维负载的立方相反钙钛矿电...反钙钛矿作为一种有潜力的新型非贵金属电催化材料,组分上不同过渡金属的填充使得反钙钛矿在析氧反应和氧还原反应表现突出,有望成为一种高效的双功能氧电催化剂。首次通过静电纺丝法结合高温煅烧法制备出碳纤维负载的立方相反钙钛矿电催化剂Zn CNi_(3)/CNFs,该催化剂结合了反钙钛矿与碳基材料导电性高、催化活性好的优点。对Zn CNi_(3)/CNFs进行电催化性能的研究测试表明,在碱性条件下其析氧反应表现出优异的催化活性,在10 m A/cm^(2)的电流密度时,Zn CNi_(3)/CNFs过电位仅为340 m V。在氧还原反应测试中,其半波电位为0.64 V (vs.RHE),极限电流密度可达-3.49 m A/cm^(2)。该研究为设计合成纯相反钙钛矿碳化物,并实现双功能反钙钛矿氧电催化剂提供基础。展开更多
The copper-manganese mixed oxides prepared by coprecipitation were tested for water gas shift reaction on a micro-reaction system with on-line GC analysis and characterized by XRD,TEM,BET and TPR.The adding rate of pr...The copper-manganese mixed oxides prepared by coprecipitation were tested for water gas shift reaction on a micro-reaction system with on-line GC analysis and characterized by XRD,TEM,BET and TPR.The adding rate of precipitator has significant effect on the texture and activity.The copper-manganese mixed oxide with adding time of precipitator less than 33min presents higher activity,especially the higher thermo stability.The copper-manganese mixed oxide prepared at adding time of precipitator less than 160min are mainly consisted of Cu1.5Mn1.5O4.With the increasing of adding time of precipitator,especially for longer than 160min Mn2O3 appears.After catalytic reaction MnO,Cu and Cu2O are the crystalline structure of the samples.With the increase of Mn2O3 the activity,especially the thermo stability activities decrease.Therefore,it can be concluded that the adding rate of precipitator is most curial factor for the preparation of high performance copper-manganese mixed oxides for the water gas shift reaction.展开更多
文摘反钙钛矿作为一种有潜力的新型非贵金属电催化材料,组分上不同过渡金属的填充使得反钙钛矿在析氧反应和氧还原反应表现突出,有望成为一种高效的双功能氧电催化剂。首次通过静电纺丝法结合高温煅烧法制备出碳纤维负载的立方相反钙钛矿电催化剂Zn CNi_(3)/CNFs,该催化剂结合了反钙钛矿与碳基材料导电性高、催化活性好的优点。对Zn CNi_(3)/CNFs进行电催化性能的研究测试表明,在碱性条件下其析氧反应表现出优异的催化活性,在10 m A/cm^(2)的电流密度时,Zn CNi_(3)/CNFs过电位仅为340 m V。在氧还原反应测试中,其半波电位为0.64 V (vs.RHE),极限电流密度可达-3.49 m A/cm^(2)。该研究为设计合成纯相反钙钛矿碳化物,并实现双功能反钙钛矿氧电催化剂提供基础。
文摘The copper-manganese mixed oxides prepared by coprecipitation were tested for water gas shift reaction on a micro-reaction system with on-line GC analysis and characterized by XRD,TEM,BET and TPR.The adding rate of precipitator has significant effect on the texture and activity.The copper-manganese mixed oxide with adding time of precipitator less than 33min presents higher activity,especially the higher thermo stability.The copper-manganese mixed oxide prepared at adding time of precipitator less than 160min are mainly consisted of Cu1.5Mn1.5O4.With the increasing of adding time of precipitator,especially for longer than 160min Mn2O3 appears.After catalytic reaction MnO,Cu and Cu2O are the crystalline structure of the samples.With the increase of Mn2O3 the activity,especially the thermo stability activities decrease.Therefore,it can be concluded that the adding rate of precipitator is most curial factor for the preparation of high performance copper-manganese mixed oxides for the water gas shift reaction.
