三维花状Ni(OH)_2包裹TiO_2微米球用于光催化产氢（英文）

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英文篇名：3D flower-like heterostructured TiO_2@Ni(OH)_2 microspheres for solar photocatalytic hydrogen production 作者：张伟 ; 张洪文 ; 徐建中 ; 庄华强 ; 龙金林 英文作者：Wei Zhang;Hongwen Zhang;Jianzhong Xu;Huaqiang Zhuang;Jinlin Long;College of Chemistry and Environmental Science, Hebei University;State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University;College of Chemical Engineering and Materials, Quanzhou Normal University; 关键词：三维花状核壳微球 ; 二氧化钛 ; 氢氧化镍 ; 光催化产氢 英文关键词：3D flower-like core-shell microspheres;;TiO_2;;Ni(OH)_2;;Photocatalytic hydrogen production 中文刊名：催化学报 英文刊名：Chinese Journal of Catalysis 机构：河北大学化学与环境科学学院;福州大学化学学院能源与环境光催化国家重点实验室;泉州师范学院化工与材料学院; 出版日期：2019-03-05 出版单位：催化学报 年：2019 期：03 基金：supported by the National Natural Science Foundation of China(21773031);; the Natural Science Foundation of Fujian Province(2018J01686);; the State Key Laboratory of Photocatalysis on Energy and Environment(SKLPEE-2017A01 and SKLPEE-2017B02)~~ 语种：英文; 页：93-98 页数：6 CN：21-1601/O6 ISSN：0253-9837 分类号：TQ116.2;O643.36;O644.1

摘要

TiO_2具有合适的能带位置以及成本低、无毒、稳定性高等优点,但由于大的激子结合能(130 meV)以及电子-空穴复合严重,其光催化性能和效率较低.目前,负载助催化剂是一种比较有效的提高TiO_2光催化效率的方法.助催化剂可通过抑制电子与空穴的复合、降低激子结合能、提高界面电子传输速率来提高光催化性能.寻求新型、廉价、高效产氢的助催化剂是当前光催化研究的热点.近年来, Ni(OH)_2由于具有多变的形貌以及一定的光催化性能而被人们关注.并且Ni(OH)_2本身就是p型光催化剂,可与主体材料复合形成p-n异质结材料,其中由异质结形成的内建电场可起到促进电子与空穴分离的作用.基于此,本文采用简单的合成方法制备出新颖的三维花状Ni(OH)_2包裹TiO_2纳米结构微球,通过X射线衍射仪(XRD)、扫描电镜(SEM)和透射电镜(TEM)等表征手段确定了目标产物被成功合成,并采用光催化产氢为探针反应研究了其光催化性能.结果表明, Ni(OH)_2包裹TiO_2纳米材料的产氢速率比纯TiO_2纳米材料提高了5倍.通过紫外-可见漫反射吸收光谱(DRS)与一系列对比实验发现, Ni(OH)_2拓宽了TiO_2的吸收光谱范围,催化活性的提高确实来源于引入的Ni(OH)_2.氮气吸脱附等温线和孔径分布分析表明, Ni(OH)_2壳的引入增大了催化剂的比表面积并且带来介孔,证实三维花状的纳米片界面为光催化产氢提供了更多的活性位点.电化学表征结果进一步证明,这种独特的p-n异质结促进了电子与空穴的分离和转移.基于元素分析和产氢活性结果,我们提出了可能的反应机理.
        TiO_2@Ni(OH)_2 core-shell microspheres were synthesized by a facile strategy to obtain a perfect 3D flower-like nanostructure with well-arranged Ni(OH)_2 nanoflakes on the surfaces of TiO_2 microspheres; this arrangement led to a six-fold enhancement in photocatalytic hydrogen evolution. The unique p-n type heterostructure not only promotes the separation and transfer of photogenerated charge carriers significantly, but also offers more active sites for photocatalytic hydrogen production. A photocatalytic mechanism is proposed based on the results of electrochemical measurements and X-ray photoelectron spectroscopy.

引文

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