Electron transfer accelerated polymer-TiO2 coatings for enhanced photocatalytic activity in photocathodic protection
Electron transfer accelerated polymer-TiO2 coatings for enhanced photocatalytic activity in photocathodic protection
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DOI：
10.1016/j.apsusc.2022.153984
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发表时间：
2022-06
影响因子：
6.7
通讯作者：
Guotao Pan;Zhaoxia Ding;Nianqing Fu;Guoge Zhang;W. Zu;Yi Zhan;Mingmei Xue;Yan Liu
中科院分区：
文献类型：
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作者：
Guotao Pan;Zhaoxia Ding;Nianqing Fu;Guoge Zhang;W. Zu;Yi Zhan;Mingmei Xue;Yan Liu
TiO 2光阳极涂层的集成设计概念通常会遇到由于非活性添加剂导致涂层中载流子传输缓慢的问题。理论计算和相应的实验结果表明，聚丙烯酸（PAA）粘合剂的引入可以通过化学键合提高TiO 2纳米粒子的电子传输能力。在PAA中引入羧甲基纤维素钠（CMC），在TiO 2基体中构建三维互联网络。采用旋涂法制备了TiO 2-PAA-CMC多元交联的一体化光阳极涂层。该光阳极具有良好的机械稳定性和上级光电化学性能，在3.5%NaCl电解液中模拟太阳光照射下，其光致电流高达61.26 μA cm− 2，腐蚀电位为−550 mV，对304不锈钢具有良好的光阴极保护作用。傅立叶变换红外光谱和电子顺磁共振分别将最高性能归因于TiO 2-PAA-CMC之间的界面-COO-键和脱水的非共轭自由基聚合物CMC的增强的导电性用于电荷转移和传输。它为开发用于光电化学应用的稳定高效的TiO 2基涂层铺平了道路。
The concept of integrated design with TiO2photoanode coating generally encounters the problem of sluggish carrier transport in the coating due to inactive additives. The theoretical calculation and the corresponding experiment results suggest that the incorporation of polyacrylic acid (PAA) binder into TiO2nanoparticles can enhance electron transport capability by chemical bonding between TiO2and PAA. To construct a three-dimensionally interconnected network in the TiO2matrix, sodium carboxymethyl cellulose (CMC) is introduced into PAA. An integrated photoanode coating with multicomponent interlinking among TiO2-PAA-CMC is realized by spin-coating method followed by thermal treatment in a vacuum. The photoanode exhibits good mechanical stability and superior photoelectrochemical performance for photocathodic protection of 304 stainless steel with a high photo-induced current of 61.26 μA cm−2and a low corrosion potential of −550 mV under simulated solar irradiation in 3.5% NaCl electrolyte. Fourier transform infrared spectroscopy and electron paramagnetic resonance attribute the supreme performance to the interfacial –COO– bond among TiO2-PAA-CMC and the enhanced conductivity of dehydrated nonconjugated radical polymer CMC for charge transfer and transport respectively. It paves the way to exploit stable and efficient TiO2-based coatings for photoelectrochemical applications.