Binder-integrated Bi/BiOI/TiO2 as an anti-chloride corrosion coating for enhanced photocathodic protection of 304 stainless steel in simulated seawater
Binder-integrated Bi/BiOI/TiO2 as an anti-chloride corrosion coating for enhanced photocathodic protection of 304 stainless steel in simulated seawater
复制标题
DOI：
10.1016/j.jallcom.2022.168469
复制
发表时间：
2022-12-26
影响因子：
6.2
通讯作者：
Liu, Yan
中科院分区：
文献类型：
--
作者：
Pan, Guotao;Li, Jianhua;Liu, Yan
在海洋环境中制备Bi/BiOI催化剂对金属进行有效的光阴极保护一直是一个棘手的问题，因为在Cl离子腐蚀下Bi氧化和I离子释放。本文通过将羧甲基纤维素钠（CMC）整合到复合材料中，成功制备了具有“截断模式”的花瓣状Bi/ bioi修饰TiO2 (TBB) p-n异质结构涂层。所制备的涂层（CTBB）在模拟海水中对304不锈钢（304SS）具有稳定的光电阴极保护作用。与TiO2相比，CMC集成的Bi/BiOI/TiO2 p-n异质结构涂层在没有空穴清除剂参与的情况下，在模拟海水中具有43 μ a cm-2的大光电流响应和- 250 mV的稳定电位下降，其光电阴极保护性能得到了增强，这归因于p-n异质结界面上可见光利用率的提高和电子-空穴对的快速迁移。此外，CMC有效地保护了Bi纳米粒子免受氧化和bii免受电解质中Cl离子的腐蚀，这是由于电子密度在I离子附近的重新分布。制备的CTBB涂层在模拟海水中作为光阳极对304SS进行光阴极保护具有很大的潜力。(c) 2022 Elsevier B.V.版权所有
Preparing Bi/BiOI catalysts for efficient photocathodic protection of metals in the marine environment has been always a tricky problem because of Bi oxidation and I- ion release under Cl- ion corrosion. Herein, by integrating sodium carboxymethyl cellulose (CMC) into the composites, petal-like Bi/BiOI-modified TiO2 (TBB) p-n heterostructure coatings with a "truncated schema" were successfully fabricated. The as-prepared coatings (CTBB) provided stable photocathodic protection for 304 stainless steel (304SS) in simulated seawater. Compared with TiO2, CMC integrated Bi/BiOI/TiO2 p-n heterostructure coatings showed enhanced photocathodic protection performance with a large photocurrent response of 43 mu A cm-2 and a stable potential drop of - 250 mV in simulated seawater without the participation of hole scavengers, which was attributed to the improvement of visible-light utilization and fast electron-hole pair migration at the p-n heterojunction interface. Furthermore, CMC effectively protected Bi nanoparticles against oxidation and BiOI from corrosion of Cl- ions in the electrolyte due to electron density redistribution in the vicinity of I ions. The as-fabricated CTBB coatings showed great potential as photoanodes for photocathodic protection of 304SS in simulated seawater.(c) 2022 Elsevier B.V. All rights reserved.