Haujin Salih , Maximilian Cieluch , Philipp L. Maack , Norbert Kazamer , Florian Wirkert , Ulrich Rost , Cemal Esen , Michael Brodmann
{"title":"飞秒激光诱导多孔镍取代碱性析氧反应阳极催化剂层的表面结构","authors":"Haujin Salih , Maximilian Cieluch , Philipp L. Maack , Norbert Kazamer , Florian Wirkert , Ulrich Rost , Cemal Esen , Michael Brodmann","doi":"10.1016/j.apsadv.2025.100756","DOIUrl":null,"url":null,"abstract":"<div><div>Femtosecond laser-induced nano structuring offers a novel approach to enhance the performance of porous transport layers (PTLs) in anion-exchange membrane water electrolysis. By applying ultrashort laser pulses to nickel felts, distinct surface morphologies were generated, including high-spatial-frequency laser-induced periodic surface structures (HSFL-LIPSS), irregular ablated surfaces, and hybrid structures. Surface area analysis revealed increases of up to 4-fold for LIPSS, 6-fold for hybrid structures (LIPSS+Ablation), and 9-fold for ablated surfaces compared to untreated fibers. Electrochemical testing showed reduced overpotentials for laser-treated samples, comparable to state-of-the-art electrodes despite the absence of catalyst layers. Overpotentials could be reduced by up to 6.5 % at 10 mA cm<sup>−2</sup> and by up to 9.6 % at 100 mA cm<sup>−2</sup> compared to the unprocessed felt. Notably, ablated structures, with the highest surface areas, exhibited microcavities that may entrap oxygen bubbles, limiting active site and reaction rates. The LIPSS structures demonstrated the lowest activation losses and highest current density (1.32 A cm⁻² at 2.0 V) due to their periodic morphology and enhanced electrolyte flow, representing a 17 % improvement at 2.0 V compared to the untreated felts. Moreover, Tafel slopes down to 66 mV dec<sup>−1</sup> denote a performant kinetic while oxidation charge measurements revealed pronounced peaks for laser-treated samples, with ablated surfaces achieving the highest charge of 16.76 ± 1.64 C cm⁻². Chronopotentiometry revealed the LIPSS structures showing the highest resistance to degradation among the structured samples.</div><div>These findings suggest femtosecond laser nano structuring as a promising method to improve PTL performance. Further application of catalyst layers could amplify the electrochemical efficiency of these advanced materials.</div></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":"27 ","pages":"Article 100756"},"PeriodicalIF":7.5000,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Femtosecond laser-induced surface structuring of porous nickel substituting anodic catalyst layers for alkaline oxygen evolution reaction\",\"authors\":\"Haujin Salih , Maximilian Cieluch , Philipp L. Maack , Norbert Kazamer , Florian Wirkert , Ulrich Rost , Cemal Esen , Michael Brodmann\",\"doi\":\"10.1016/j.apsadv.2025.100756\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Femtosecond laser-induced nano structuring offers a novel approach to enhance the performance of porous transport layers (PTLs) in anion-exchange membrane water electrolysis. By applying ultrashort laser pulses to nickel felts, distinct surface morphologies were generated, including high-spatial-frequency laser-induced periodic surface structures (HSFL-LIPSS), irregular ablated surfaces, and hybrid structures. Surface area analysis revealed increases of up to 4-fold for LIPSS, 6-fold for hybrid structures (LIPSS+Ablation), and 9-fold for ablated surfaces compared to untreated fibers. Electrochemical testing showed reduced overpotentials for laser-treated samples, comparable to state-of-the-art electrodes despite the absence of catalyst layers. Overpotentials could be reduced by up to 6.5 % at 10 mA cm<sup>−2</sup> and by up to 9.6 % at 100 mA cm<sup>−2</sup> compared to the unprocessed felt. Notably, ablated structures, with the highest surface areas, exhibited microcavities that may entrap oxygen bubbles, limiting active site and reaction rates. The LIPSS structures demonstrated the lowest activation losses and highest current density (1.32 A cm⁻² at 2.0 V) due to their periodic morphology and enhanced electrolyte flow, representing a 17 % improvement at 2.0 V compared to the untreated felts. Moreover, Tafel slopes down to 66 mV dec<sup>−1</sup> denote a performant kinetic while oxidation charge measurements revealed pronounced peaks for laser-treated samples, with ablated surfaces achieving the highest charge of 16.76 ± 1.64 C cm⁻². Chronopotentiometry revealed the LIPSS structures showing the highest resistance to degradation among the structured samples.</div><div>These findings suggest femtosecond laser nano structuring as a promising method to improve PTL performance. Further application of catalyst layers could amplify the electrochemical efficiency of these advanced materials.</div></div>\",\"PeriodicalId\":34303,\"journal\":{\"name\":\"Applied Surface Science Advances\",\"volume\":\"27 \",\"pages\":\"Article 100756\"},\"PeriodicalIF\":7.5000,\"publicationDate\":\"2025-05-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applied Surface Science Advances\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2666523925000649\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Surface Science Advances","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666523925000649","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
摘要
飞秒激光诱导纳米结构为提高阴离子交换膜电解中多孔传输层(PTLs)的性能提供了一种新的途径。通过对镍毡施加超短激光脉冲,可以产生不同的表面形貌,包括高空间频率激光诱导的周期性表面结构(HSFL-LIPSS)、不规则烧蚀表面和混合结构。表面积分析显示,与未经处理的纤维相比,LIPSS增加了4倍,混合结构(LIPSS+消融)增加了6倍,消融表面增加了9倍。电化学测试表明,激光处理样品的过电位降低,与最先进的电极相当,尽管没有催化剂层。与未加工毛毡相比,在10 mA cm - 2下过电位可降低6.5%,在100 mA cm - 2下过电位可降低9.6%。值得注意的是,烧蚀结构具有最高的表面积,显示出可能捕获氧气气泡的微腔,限制了活性位点和反应速率。LIPSS结构表现出最低的激活损失和最高的电流密度(2.0 V时1.32 A cm⁻²),因为它们的周期性形态和增强的电解质流动,在2.0 V时比未处理的毡提高了17%。此外,Tafel斜率下降到66 mV dec−1表明了一个高性能的动力学,而氧化电荷测量显示激光处理的样品有明显的峰值,烧蚀表面达到16.76±1.64 C cm⁻²的最高电荷。时间电位测定显示LIPSS结构在结构样品中表现出最高的降解抗性。这些发现表明,飞秒激光纳米结构是一种很有前途的改善PTL性能的方法。催化剂层的进一步应用可以提高这些先进材料的电化学效率。
Femtosecond laser-induced surface structuring of porous nickel substituting anodic catalyst layers for alkaline oxygen evolution reaction
Femtosecond laser-induced nano structuring offers a novel approach to enhance the performance of porous transport layers (PTLs) in anion-exchange membrane water electrolysis. By applying ultrashort laser pulses to nickel felts, distinct surface morphologies were generated, including high-spatial-frequency laser-induced periodic surface structures (HSFL-LIPSS), irregular ablated surfaces, and hybrid structures. Surface area analysis revealed increases of up to 4-fold for LIPSS, 6-fold for hybrid structures (LIPSS+Ablation), and 9-fold for ablated surfaces compared to untreated fibers. Electrochemical testing showed reduced overpotentials for laser-treated samples, comparable to state-of-the-art electrodes despite the absence of catalyst layers. Overpotentials could be reduced by up to 6.5 % at 10 mA cm−2 and by up to 9.6 % at 100 mA cm−2 compared to the unprocessed felt. Notably, ablated structures, with the highest surface areas, exhibited microcavities that may entrap oxygen bubbles, limiting active site and reaction rates. The LIPSS structures demonstrated the lowest activation losses and highest current density (1.32 A cm⁻² at 2.0 V) due to their periodic morphology and enhanced electrolyte flow, representing a 17 % improvement at 2.0 V compared to the untreated felts. Moreover, Tafel slopes down to 66 mV dec−1 denote a performant kinetic while oxidation charge measurements revealed pronounced peaks for laser-treated samples, with ablated surfaces achieving the highest charge of 16.76 ± 1.64 C cm⁻². Chronopotentiometry revealed the LIPSS structures showing the highest resistance to degradation among the structured samples.
These findings suggest femtosecond laser nano structuring as a promising method to improve PTL performance. Further application of catalyst layers could amplify the electrochemical efficiency of these advanced materials.