Se掺杂La_(2)S_(3)材料的制备及析氢性能的研究

Preparation and Hydrogen Evolution Properties of Se Doped La_(2)S_(3)Materials

通过水热法在碳纤维纸上合成一系列La_(2)S_(3-x)Se_(x)(x=0、0.15、0.2、0.25、0.3、3)化合物,探索最佳的Se与S的比例,并将其应用于电解水制氢催化中,碳纤维纸的应用不仅可以增强电子传递速率还可以减少产物堆积,进而暴露更多活性位点。结果表明,在酸性条件下,x=0.2时,La_(2)S_(1.83)Se_(0.078)电催化剂具有最高的比表面积,且表现出优异的催化活性和稳定性,当电流密度为10 mA·cm^(-2)时,过电位为250 mV,电荷转移电阻为4.5Ω,Tafel斜率为62.23 mV·dec^(-1),且在经过3000圈CV循环测试后,过电势仅增加了23 mV。

A series of La_(2)S_(3-x)Se_(x)(x=0,0.15,0.2,0.25,0.3,3)compounds were synthesized on carbon fiber paper by hydrothermal method to explore the best ratio of Se and S,and they were first applied to the catalysis of hydrogen production from electrolytic water.The application of carbon fiber paper can not only enhance the electron transfer rate,but also reduce the product accumulation,thus exposing more active sites.The results showed that La_(2)S_(1.83)Se_(0.078)had the highest specific surface area,excellent catalytic activity and stability when x=0.2 under acidic conditions.When the current density was 10 mA·cm^(-2),the overpotential was 250 mV,the charge transfer resistance was 4.5Ω,and the Tafel slope was 62.23 mV.dec^(-1).After 3000 cycles of CVtest,the overpotential only increased by 23 mV.