Co₃(PO₄)₂/Ta₃N₅纳米花的控制合成及光催化解水析氢性能  

Controllable Synthesis and Photocatalytic Hydrogen Evolution of Co3(PO4)2/Ta3N5 Nanoflowers

作　　者：孟祥磊 

机构地区：[1]哈尔滨师范大学化学化工学院,黑龙江 哈尔滨

出　　处：《材料科学》2023年第4期330-336,共7页Material Sciences

摘　　要：本文以TaCl5为钽源,经水热、高温氮化、光沉积过程制得Co3(PO4)2/Ta3N5纳米花。考查了Co3(PO4)2修饰量对样品光生载流子分离效率的影响规律;在Co3(PO4)2修饰量为2 wt%时,样品光电流为0.561 μA∙cm−2,是Ta3N5纳米花(0.1 μA∙cm−2)的5.61倍,载流子分离效率明显提升。表面修饰Co3(PO4)2后,形成Co3(PO4)2/Ta3N5局域异质结构;增强了样品在可见光区域的光吸收性能,降低了HER和OER过电位。在模拟太阳光照射下,样品光催化解水产氢活性为417.6 μmol∙g−1∙h−1,明显高于未修饰的Ta3N5样品(165.4 μmol∙g−1∙h−1)。In this paper, Co3(PO4)2/Ta3N5 nanoflowers were prepared through hydrothermal, high tempera-ture nitriding, and photochemical deposition processes, using TaCl5 as tantalum source. The effect of Co3(PO4)2 modification amount on the separation efficiency of photo generated carrier in the sample was investigated. When the modification amount of Co3(PO4)2 was 2 wt%, the photocurrent density of the sample was 0.561 μA∙cm−2, which was 5.61 times that of Ta3N5 nanoflower (0.1 μA∙cm−2), and the carrier separation efficiency was improved obviously. After surface modification of Co3(PO4)2, the local heterostructure of Co3(PO4)2/Ta3N5 was constructed, which enhanced the light absorption properties of the samples in the visible region and reduced over potential of HER and OER. Under simulated sunlight irradiation, the photocatalytic water splitting into hydrogen activity of Co3(PO4)2/Ta3N5 was 417.6 μmol∙g−1∙h−1, significantly higher than that of the unmodified Ta3N5 sample (165.4 μmol∙g−1∙h−1).

关 键 词：光沉积 载流子分离 模拟太阳光 纳米花 光吸收性能 过电位 异质结构 析氢性能 

分 类 号：O64[理学—物理化学]