原位ATR-IR光谱研究钽酸钠光催化全分解水机理  

Mechanistic Study of Photocatalytic Overall Water Splitting on NaTaO3-based Photocatalysts by In-Situ ATR-IR Spectroscopy

作　　者：丁倩 陈涛[1,3] 冯兆池[1] 王秀丽[1] DING Qian;CHEN Tao;FENG Zhaochi;WANG Xiuli(State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Marine Science and Environment Engineering,Dalian Ocean University,Dalian,116023,China)

机构地区：[1]催化基础国家重点实验室,中国科学院大连化学物理研究所,大连116023 [2]中国科学院大学,北京100049 [3]海洋科技与环境学院,大连海洋大学,大连116023

出　　处：《光散射学报》2020年第4期381-385,共5页The Journal of Light Scattering

基　　金：国家自然科学基金(21633015、21872143)。

摘　　要：采用固相反应和浸渍法制备了NiO/NaTaO_(3):La催化剂。采用衰减全反射红外光谱原位研究了钽酸钠基光催化剂上光催化全分解水机理。在光催化反应条件下直接观测到了归属为物理吸附的过氧化氢中间物种的1350 cm^(-1)和870 cm^(-1)红外吸收峰。过氧化氢物种是由水氧化的中间物种Ta(O_(2))在大量水存在条件下先质子化生成TaOOH中间物种,之后进一步质子化而形成的。证实了NaTaO_(3)液态光催化和气相光催化分解水的机理是一致的。NiO/NaTaO_(3):La photocatalyst was prepared by solid-state reaction and impregnation methods.We investigated the photocatalytic overall water splitting on NaTaO_(3)-based photocatalysts by in situ ATR-IR spectroscopy.Two new species with IR absorption peaks centered at 1350 and 870 cm^(-1) were observed and assigned to H_(2)O_(2) species.H_(2)O_(2) is formed by protonation of Ta(O_(2)),a water oxidation intermediate,when it is surrounded by a large amount of water.

关 键 词：光催化全分解水 原位红外 钽酸钠 

分 类 号：O64[理学—物理化学]