Ag nanoparticles anchored organic/inorganic Z‐scheme 3DOMM‐TiO_(2‒x)‐based heterojunction for efficient photocatalytic and photoelectrochemical water splitting  

Ag纳米粒子修饰有机/无机Z型3DOMM-TiO_(2‒x)异质结的构建及高效光催化和光电催化分解水制氢

作　　者：Zhiying Xu Chunyu Guo Xin Liu Ling Li Liang Wang Haolan Xu Dongke Zhang Chunhu Li Qin Li Wentai Wang 徐志莹;郭春雨;刘欣;李苓;王亮;徐浩兰;张东柯;李春虎;李勤;王文泰(中国海洋大学化学化工学院,海洋化学理论与技术教育部重点实验室,山东青岛266100;天津理工大学,新能源材料与低碳技术研究院,天津300384;澳大利亚南澳大学未来产业研究院,南澳大利亚州,澳大利亚;澳大利亚西澳大学能源中心,西澳大利亚州,澳大利亚;澳大利亚格里菲斯大学,昆士兰微米纳米技术中心,澳大利亚昆士兰;青岛工学院食品工程学院,山东青岛266300)

机构地区：[1]Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,Shandong,China [2]Institute for New Energy Materials and Low‐Carbon Technologies,Tianjin University of Technology,Tianjin 300384,China [3]Future Industries Institute,UniSA STEM,University of South Australia,Mawson Lakes Campus,South Australia 5095,Australia [4]Centre for Energy(M473),The University of Western Australia,35 Stirling Highway,Crawley,Western Australia 6009,Australia [5]Queensland Micro‐and Nanotechnology Centre,Griffith University Nathan Campus,Brisbane,Queensland 4111,Australia [6]College of Food Engineering,Qingdao Institute of Technology,Qingdao 266300,Shandong,China

出　　处：《Chinese Journal of Catalysis》2022年第5期1360-1370,共11页催化学报（英文）

基　　金：国家自然科学基金(51602297);煤炭高效利用与绿色化工国家重点实验室开放课题(2021-K53);澳大利亚基金委(ARC DP160104089,DP180103588).

摘　　要：Narrow spectral response,low charge separation efficiency and slow water oxidation kinetics of TiO_(2)limit its application in photoelectrochemical and photocatalytic water splitting.Herein,a promising organic/inorganic composite catalyst Ag/PANI/3DOMM‐TiO_(2–x)with a three‐dimensional ordered macro‐and meso‐porous(3DO MM)structure,oxygen vacancy and Ti^(3+)defects,heterojunction formation and noble metal Ag was designed based on the Z‐scheme mechanism and successfully prepared.The Ag/PANI/3DOMM‐TiO_(2–x)ternary catalyst exhibited enhanced hydrogen production activity in both photocatalytic and photoelectrochemical water splitting.The photocatalytic hydrogen production rate is 420.90μmol g^(–1)h^(–1),which are 19.80 times and 2.06 times higher than the commercial P25 and 3DOMM‐TiO_(2),respectively.In the photoelectrochemical tests,the Ag/PANI/3DOMM‐TiO_(2–x)photoelectrode shows enhanced separation and transfer of carriers with a high current density of 1.55 mA cm^(–2)at equilibrium potential of 1.23 V under simulated AM 1.5 G illumination,which is approximately 5 times greater than the 3DOMM‐TiO_(2).The present work has demonstrated the promising potential of organic/inorganic Z‐scheme photocatalyst in driving water splitting for hydrogen production.资源短缺和环境污染成为制约当今社会发展的两大难题,清洁能源代替化石能源的大潮已全面开启,而氢能作为新一代清洁能源在全球范围内备受关注与重视.太阳能和水都是丰富的可再生资源,利用太阳能将水转化为氢能的光催化和光电催化分解水产氢技术具有广阔的前景.二氧化钛(TiO_(2))作为一种n型半导体,具有耐光腐蚀性、稳定性、低成本和无毒性等优点,已被广泛应用于光催化降解污染物、产氢和CO_(2)转化等领域.但TiO_(2)也存在光谱响应范围较窄、光生载流子复合率高、氧化动力学缓慢等缺点,严重限制了其在光催化和光电催化分解水方面的应用.为了改善TiO_(2)的上述缺点,本文通过形貌控制、结构设计、缺陷工程、异质结构建和贵金属掺杂等多种策略合成了Ag/PANI/3DOMM-TiO_(2–x)三元催化剂,显著提升了光催化和光电催化分解水产氢的性能.Ag/PANI/3DOMM-TiO_(2–x)催化剂具有以下特点:(1)催化剂为三维有序大孔结构且具有较大的比表面积和均匀的孔径,有利于传质扩散并为催化剂提供了更多的吸附和反应位点;(2)在3DOMM-TiO_(2)中引入Ti^(3+)和氧空位等缺陷可以显著减少带隙宽度,提高光吸收效率;(3)聚苯胺(PANI)作为一种典型的导电聚合物在可见光范围内表现出较高的吸收能力和良好的导电性;(4)成功构建了Z型异质结光催化剂,由于氧化和还原位点分别在3DOMM-TiO_(2–x)和PANI两种催化剂表面,从而可以显著提高光生载流子的有效分离和运输,并且催化剂具有更强的氧化还原能力;(5)通过贵金属银纳米颗粒的表面等离子体共振(SPR)效应增强对可见光的吸收,并且银纳米颗粒的SPR效应会产生更多的热电子并转移到PANI的导带,进而直接参与还原反应制氢.结合X射线衍射光谱和X射线光电子能谱表征结果,说明成功合成了Ag/PANI/3DOMM-TiO_(2–x)催化剂;扫描电子显微镜,透射电子�

关 键 词：PHOTOELECTROCHEMICAL PHOTOCATALYSIS Organic/inorganic composite HETEROJUNCTION Water splitting 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学]