Zr掺杂促进氧化铁光阳极电荷分离  

Promotion of charge separation by Zr doping in hematite photoanode

作　　者：马畅通 韩洪宪[1] MA Changtong;HAN Hongxian(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《工业催化》2024年第11期60-66,共7页Industrial Catalysis

摘　　要：通过Zr掺杂对氧化铁进行改性,可以有效提升氧化铁光阳极的光电催化水分解效率。采用化学浴的方法制备FeOOH前驱物,进而结合浸渍和高温退火合成Zr掺杂的氧化铁光阳极。光电测试结果表明,Zr元素的掺杂显著提升氧化铁光阳极的光电流密度,电荷分离效率和电荷注入效率的提升是其光电流密度提升的主要原因。光电化学阻抗谱研究进一步表明,Zr元素的掺杂显著降低氧化铁光阳极的表面电荷复合速率k_(rec)。Zr元素的掺杂可以对氧化铁光阳极的表面态进行钝化,从而减少光生电荷表面复合,促进光生电荷分离。Hematite photoanode was modified via Zr doping to improve photoelectrochemical water splitting efficiency.FeOOH precursor was synthesized by chemical bath method,followed by impregnation and high temperature annealing method to prepare Zr doped hematite phtoanode.The results of photoelectrochemical tests reveal that the photocurrent density of the Zr doped hematite photoanode is significantly increased compared with that of the pure hematite photoanode.The improvement of the photocurrent density is due to the enhanced charge separation and injection efficiency.The study of photoelectrochemical impedance spectroscopy further demonstrates that Zr doping can effectively reduce the surface charge recombination rate k_(rec).Therefore,Zr doping can passivate the surface states existing in the surface of hematite photoanode,which will reduce the surface recombination of photogenerated charges and promote the separation of photogenerated charges.

关 键 词：催化化学 氧化铁 光阳极 水分解 电荷分离 Zr掺杂 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]