Engineered active Co sites in ternary NiFeCo-layered double hydroxide nanoarrays for highly-efficient photocathodic protection of 304 stainless steel in the dark

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL Surfaces and Interfaces Pub Date : 2025-02-01 Epub Date: 2025-01-22 DOI:10.1016/j.surfin.2025.105894

Yanqi Xu , Rongrong Chen , Cunjun Li , Hai Wang , Shuzhen Ma , Linjiang Wang

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Abstract

To achieve prolonged photocathodic protection (PCP) of 304 stainless steel (304SS) in marine environments, effective charge mobility and electron storage within the photoanodes are essential. In this study, ternary NiFeCo-layered double hydroxide nanoarrays on titanium foil (Ti/NiFeCo-LDH) were synthesized to enable PCP for 304SS. The engineered active Co sites in Ti/NiFeCo-LDH play a dual role: they adjust the electronic and band structures and act as efficient reductants, creating oxygen vacancies that enhance electron transfer from Ti/NiFeCo-LDH to 304SS. Consequently, the fabricated Ti/NiFeCo-LDH exhibits highly efficient PCP for 304SS in simulated seawater, achieving an open circuit potential (OCP) of −803 mV in the dark and maintaining a consistent potential of -760 mV over 82 h. This research presents a significant advancement in developing efficient photoanodes for PCP in metallic materials.

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在三元氮化镍层状双氢氧化物纳米阵列中设计活性Co位点，用于在黑暗中对304不锈钢进行高效光电阴极保护

为了在海洋环境中实现304不锈钢（304SS）的长时间光电阴极保护（PCP），光电阳极内有效的电荷迁移率和电子存储是必不可少的。本研究在钛箔上合成了三元nifeco层状双氢氧化物纳米阵列（Ti/NiFeCo-LDH），以实现304SS的PCP。Ti/NiFeCo-LDH中的工程活性Co位点起双重作用：它们调节电子和能带结构，并作为有效的还原剂，产生氧空位，促进电子从Ti/NiFeCo-LDH向304SS的转移。因此，制备的Ti/NiFeCo-LDH在模拟海水中对304SS表现出高效的PCP，在黑暗中实现了- 803 mV的开路电位（OCP），并在82小时内保持了-760 mV的稳定电位。该研究在开发金属材料中用于PCP的高效光阳极方面取得了重大进展。

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来源期刊

Surfaces and Interfaces Chemistry-General Chemistry

CiteScore

8.50

自引率

6.50%

发文量

753

审稿时长

35 days

期刊介绍： The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)