Scholarlink

<p>Photocathodic protection has emerged as a promising green strategy for mitigating metal corrosion; however, its practical application is still limited by the insufficient visible-light response of conventional semiconductors and the rapid recombination of photogenerated charge carriers. To address these challenges, Co<sub><i>x</i></sub>Ni<sub>1−<i>x</i></sub>-zeolitic imidazolate framework (ZIF)/TiO<sub>2</sub> nanotube array composite photoanodes were fabricated and applied for the photocathodic protection of 304 stainless steel (304SS). By introducing different proportions of Co<sup>2+</sup> and Ni<sup>2+</sup> into the ZIF framework, the electronic structure of the bimetallic ZIFs was effectively regulated. Co<sub>0.5</sub>Ni<sub>0.5</sub>-ZIF exhibited the most favorable band alignment with TiO<sub>2</sub>, enabling the formation of a type-II heterojunction and promoting efficient separation of photogenerated charge carriers. Under illumination in 3.5&#xa0;wt.% NaCl solution, the optimized composite photoanode induced a negative shift of the open-circuit potential of 304SS to −0.44&#xa0;V and reduced the corrosion current density by approximately one order of magnitude. Furthermore, pitting corrosion was significantly suppressed, with the pitting potential shifting from −0.50&#xa0;V to −2.43&#xa0;V. Long-term immersion tests under natural light conditions demonstrated stable photocathodic protection performance for up to 28&#xa0;days.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Controllable Band Structure Engineering of CoxNi1−x-ZIF/TiO2 Heterojunction for Durable Photocathodic Protection

  • 期刊论文

  • 发表日期：

    2026年7月19日

查看全文
  • Qianxilong Wang,
  • Jiaqing Liu,
  • Jiansheng Wang,
  • Xiongfeng Zeng,
  • Ruimin Wang,
  • Yingna Zhao

摘要

Photocathodic protection has emerged as a promising green strategy for mitigating metal corrosion; however, its practical application is still limited by the insufficient visible-light response of conventional semiconductors and the rapid recombination of photogenerated charge carriers. To address these challenges, CoxNi1−x-zeolitic imidazolate framework (ZIF)/TiO2 nanotube array composite photoanodes were fabricated and applied for the photocathodic protection of 304 stainless steel (304SS). By introducing different proportions of Co2+ and Ni2+ into the ZIF framework, the electronic structure of the bimetallic ZIFs was effectively regulated. Co0.5Ni0.5-ZIF exhibited the most favorable band alignment with TiO2, enabling the formation of a type-II heterojunction and promoting efficient separation of photogenerated charge carriers. Under illumination in 3.5 wt.% NaCl solution, the optimized composite photoanode induced a negative shift of the open-circuit potential of 304SS to −0.44 V and reduced the corrosion current density by approximately one order of magnitude. Furthermore, pitting corrosion was significantly suppressed, with the pitting potential shifting from −0.50 V to −2.43 V. Long-term immersion tests under natural light conditions demonstrated stable photocathodic protection performance for up to 28 days.