Composite doped ITSOFC(Intermediate Temperature Solid Oxide Fuel Cell ) cathode material of La0.6Sr0.4-xCaxCo1-yNiyO3-δ(LSCCN)was synthesized through solid-phase reaction.The crystal structure and forming process of ...Composite doped ITSOFC(Intermediate Temperature Solid Oxide Fuel Cell ) cathode material of La0.6Sr0.4-xCaxCo1-yNiyO3-δ(LSCCN)was synthesized through solid-phase reaction.The crystal structure and forming process of LSCCN powder were investigated with XRD.The experimental results showed that Ca2+ could not be well mixed into the LaCoO3 lattice when x was 0.4.The crystal structure of the material was stable when the metal molar percentage of Ni was less than 5%, but it lost the single perovskite phase structure and presented the square K2NiF4 phase of LaSrCoO4 when the content of Ni increased.The SOFC(Solid Oxide Fuel Cell) cathode wafers could be made by mixing a specific amount of amylum and ethylic cellulose with LSCCN cathode powder.The electrical conductivity of the samples was measured by using the four-probe DC method from 100℃ to 800℃ in atmosphere.The electrical conductivity of the cathode wafers with perovskite structure was higher than 105 S·m-1, in which the electrical conductivity of the La0.6Sr0.2Ca0.2Co0.9Ni0.1O3-δ samples could reach 57701 S·m-1 when heated up to 800℃.The sample single crystal lattice structure changed significantly and its electrical conductivity decreased considerably when the molar percentage of Ca2+ or Ni2+ increased.展开更多
Metal doping for active sites exhibits remarkable potential for improving the hydrogen evolution reaction(HER).Multi-doping and the use of a conductive substrate can further modulate catalytic performance.Herein,Nb-Co...Metal doping for active sites exhibits remarkable potential for improving the hydrogen evolution reaction(HER).Multi-doping and the use of a conductive substrate can further modulate catalytic performance.Herein,Nb-CoSe well dispersed in N-doped carbon nanospheres(NCs,Nb-CoSe@NC)was synthesized to serve as a conductive substrate and facilitated good dispersion of active sites for the HER.Nb doping can also change the electronic structure of CoSe,which facilitates the activity for the HER.In order to further improve the conductivity and intrinsic activity of Nb-CoSe@NC,dual,nonmetal doping was realized through gas sulfurization to prepare hierarchical Nb-CoSeS@NC.The prepared Nb-CoSeS@NC,with a core-shell structure,exhibited a low overpotential of 115 mV at 10 mA cm–2,which is smaller than that of the most doped catalysts.In addition,NCs not only improved the dispersion and conductivity of the catalyst but also prevented metal corrosion in an electrolyte,thus facilitating the long-term stability of Nb-CoSeS@NC.Moreover,the synergistic effect of the multi-doping of Nb,S,and Se was explained.This work provides a promising,multi-doping strategy for the large-scale application of transition-metal-based electrocatalysts for the HER.展开更多
对BiCuSeO功能陶瓷进行Bi/Cu/Se三位置掺杂,采用机械合金化和放电等离子烧结工艺制备Bi_(1-x)Ba_(x/2)Pb_(x/2)Cu_(1-x)Ni_(x)Se_(1-x)Te_(x)O(x=0,0.02,0.04,0.06,0.08,0.10,摩尔分数)陶瓷,通过掺杂前后的物相组成、组织结构、电传输...对BiCuSeO功能陶瓷进行Bi/Cu/Se三位置掺杂,采用机械合金化和放电等离子烧结工艺制备Bi_(1-x)Ba_(x/2)Pb_(x/2)Cu_(1-x)Ni_(x)Se_(1-x)Te_(x)O(x=0,0.02,0.04,0.06,0.08,0.10,摩尔分数)陶瓷,通过掺杂前后的物相组成、组织结构、电传输参数、热传输参数等表征,研究三位置掺杂对Bi Cu Se O功能陶瓷热电性能的影响和强化机理。结果表明,三位置掺杂可杂糅几种元素的增益效果,使Bi Cu Se O功能陶瓷保持较高Seebeck系数的前提下,电导率和功率因子显著提高。最佳掺杂量x为0.10,所得Bi_(0.90)Ba_(0.05)Pb_(0.05)Cu_(0.90)Ni_(0.10)Se_(0.90)Te_(0.10)O陶瓷在873 K温度下获得最高功率因子0.71 mW/(m·K^(2))和最大热电优值1.06,分别约为未掺杂陶瓷的2.5倍和2倍。展开更多
文摘Composite doped ITSOFC(Intermediate Temperature Solid Oxide Fuel Cell ) cathode material of La0.6Sr0.4-xCaxCo1-yNiyO3-δ(LSCCN)was synthesized through solid-phase reaction.The crystal structure and forming process of LSCCN powder were investigated with XRD.The experimental results showed that Ca2+ could not be well mixed into the LaCoO3 lattice when x was 0.4.The crystal structure of the material was stable when the metal molar percentage of Ni was less than 5%, but it lost the single perovskite phase structure and presented the square K2NiF4 phase of LaSrCoO4 when the content of Ni increased.The SOFC(Solid Oxide Fuel Cell) cathode wafers could be made by mixing a specific amount of amylum and ethylic cellulose with LSCCN cathode powder.The electrical conductivity of the samples was measured by using the four-probe DC method from 100℃ to 800℃ in atmosphere.The electrical conductivity of the cathode wafers with perovskite structure was higher than 105 S·m-1, in which the electrical conductivity of the La0.6Sr0.2Ca0.2Co0.9Ni0.1O3-δ samples could reach 57701 S·m-1 when heated up to 800℃.The sample single crystal lattice structure changed significantly and its electrical conductivity decreased considerably when the molar percentage of Ca2+ or Ni2+ increased.
文摘Metal doping for active sites exhibits remarkable potential for improving the hydrogen evolution reaction(HER).Multi-doping and the use of a conductive substrate can further modulate catalytic performance.Herein,Nb-CoSe well dispersed in N-doped carbon nanospheres(NCs,Nb-CoSe@NC)was synthesized to serve as a conductive substrate and facilitated good dispersion of active sites for the HER.Nb doping can also change the electronic structure of CoSe,which facilitates the activity for the HER.In order to further improve the conductivity and intrinsic activity of Nb-CoSe@NC,dual,nonmetal doping was realized through gas sulfurization to prepare hierarchical Nb-CoSeS@NC.The prepared Nb-CoSeS@NC,with a core-shell structure,exhibited a low overpotential of 115 mV at 10 mA cm–2,which is smaller than that of the most doped catalysts.In addition,NCs not only improved the dispersion and conductivity of the catalyst but also prevented metal corrosion in an electrolyte,thus facilitating the long-term stability of Nb-CoSeS@NC.Moreover,the synergistic effect of the multi-doping of Nb,S,and Se was explained.This work provides a promising,multi-doping strategy for the large-scale application of transition-metal-based electrocatalysts for the HER.
文摘对BiCuSeO功能陶瓷进行Bi/Cu/Se三位置掺杂,采用机械合金化和放电等离子烧结工艺制备Bi_(1-x)Ba_(x/2)Pb_(x/2)Cu_(1-x)Ni_(x)Se_(1-x)Te_(x)O(x=0,0.02,0.04,0.06,0.08,0.10,摩尔分数)陶瓷,通过掺杂前后的物相组成、组织结构、电传输参数、热传输参数等表征,研究三位置掺杂对Bi Cu Se O功能陶瓷热电性能的影响和强化机理。结果表明,三位置掺杂可杂糅几种元素的增益效果,使Bi Cu Se O功能陶瓷保持较高Seebeck系数的前提下,电导率和功率因子显著提高。最佳掺杂量x为0.10,所得Bi_(0.90)Ba_(0.05)Pb_(0.05)Cu_(0.90)Ni_(0.10)Se_(0.90)Te_(0.10)O陶瓷在873 K温度下获得最高功率因子0.71 mW/(m·K^(2))和最大热电优值1.06,分别约为未掺杂陶瓷的2.5倍和2倍。
