Influence of H+ and F− on corrosion behavior of a-C coatings in bipolar plates for PEMFCs

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-10-01 DOI:10.1016/j.diamond.2025.112916

Junhao Zeng , Wei Dai , Zhetong Zhou , Qimin Wang

{"title":"Influence of H+ and F− on corrosion behavior of a-C coatings in bipolar plates for PEMFCs","authors":"Junhao Zeng , Wei Dai , Zhetong Zhou , Qimin Wang","doi":"10.1016/j.diamond.2025.112916","DOIUrl":null,"url":null,"abstract":"<div><div>This study employed a filtered cathodic vacuum arc (FCVA) method to fabricate three types of amorphous carbon (a-C) structural coatings. Using Tafel analysis and 2-hour constant-potential tests under simulated fuel cell operating conditions, the effects of H+ and F− concentrations on coating structure and corrosion resistance were investigated. Characterization techniques, including SEM surface morphology, energy-dispersive X-ray spectroscopy (EDS), Raman spectroscopy, and infrared spectroscopy, revealed that under high H+ and F− concentrations, the C<img>C sp3 bonds in the coating prepared under a low bias voltage were transformed into sp2 C bonds and C<img>H bonds. In contrast, under high bias conditions, the sp2 C bonds in coatings with higher sp2 contents were severely contaminated, resulting in increased contact resistance. Notably, at high F− concentrations, the degree of phase transformation was more pronounced. After corrosion, the coatings underwent transformations not only from C<img>C (sp2) to C<img>O bonds but also to C<img>O and C<img>C configurations.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"159 ","pages":"Article 112916"},"PeriodicalIF":5.1000,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Diamond and Related Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0925963525009732","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, COATINGS & FILMS","Score":null,"Total":0}

引用次数: 0

Abstract

This study employed a filtered cathodic vacuum arc (FCVA) method to fabricate three types of amorphous carbon (a-C) structural coatings. Using Tafel analysis and 2-hour constant-potential tests under simulated fuel cell operating conditions, the effects of H⁺ and F⁻ concentrations on coating structure and corrosion resistance were investigated. Characterization techniques, including SEM surface morphology, energy-dispersive X-ray spectroscopy (EDS), Raman spectroscopy, and infrared spectroscopy, revealed that under high H⁺ and F⁻ concentrations, the CC sp³ bonds in the coating prepared under a low bias voltage were transformed into sp² C bonds and CH bonds. In contrast, under high bias conditions, the sp² C bonds in coatings with higher sp² contents were severely contaminated, resulting in increased contact resistance. Notably, at high F⁻ concentrations, the degree of phase transformation was more pronounced. After corrosion, the coatings underwent transformations not only from CC (sp²) to CO bonds but also to CO and CC configurations.

Abstract Image

查看原文本刊更多论文

H+和F−对pemfc双极板a-C涂层腐蚀行为的影响

本研究采用过滤阴极真空电弧（FCVA）法制备了三种非晶碳（a- c）结构涂层。通过Tafel分析和模拟燃料电池工况下2小时恒电位试验，研究了H+和F−浓度对涂层结构和耐蚀性的影响。SEM表面形貌、能谱、拉曼光谱和红外光谱等表征技术表明，在高H+和F−浓度下，低偏置电压下制备的涂层中的CC sp3键转变为sp2 C键和CH键。相反，在高偏置条件下，sp2含量较高的涂层中sp2 C键受到严重污染，导致接触电阻增加。值得注意的是，在高F−浓度下，相变程度更为明显。腐蚀后，涂层不仅从CC （sp2）键转变为CO键，而且转变为CO和CC构型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.