A. Messabhia , H. Boudellioua , Y. Hamlaoui , F. Pedraza
{"title":"Electrochemical deposition of graphene-doped polyaniline films for enhanced zinc corrosion resistance","authors":"A. Messabhia , H. Boudellioua , Y. Hamlaoui , F. Pedraza","doi":"10.1016/j.apsusc.2025.163311","DOIUrl":"10.1016/j.apsusc.2025.163311","url":null,"abstract":"<div><div>Pure polyaniline (PANI), graphene-doped PANI (PANI-GR), and graphene nanoplatelet-doped PANI (PANI-GRNPs) coatings were electrodeposited galvanostatically from an aqueous solution of sodium salicylate and aniline onto zinc substrates. Graphene was obtained via the electrochemical exfoliation of graphite in an acidic medium. Prior to incorporation into the composites, both forms of graphene were dispersed in the surfactant SDS. The electrochemical behaviour of the bare and coated substrates was evaluated in 1 M NaCl. The study demonstrates that electrodeposition via galvanostatic mode is an effective method for coating zinc substrates with polyaniline (PANI) and PANI-graphene composites. Structural analyses using X-ray diffraction (XRD) and Raman spectroscopy confirmed the successful integration of graphene into the PANI matrix. The incorporation of graphene significantly improved the coating quality, enhancing surface homogeneity and minimizing the formation of surface cracks. Mechanical testing revealed that PANI-GR composite coatings exhibited superior microhardness compared to pure PANI and PANI-GRNPs coatings. The PANI-GR coatings outperformed the corrosion resistance of both bare zinc and pure PANI coatings. This enhanced corrosion resistance is attributed to the improved barrier properties, more noble corrosion potential, decreased anodic and cathodic branches and enhanced charge transfer mechanisms facilitated by graphene incorporation.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"701 ","pages":"Article 163311"},"PeriodicalIF":6.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lingxiao Li , Tingsong Yang , Zhilei Liu , Yanfeng Feng , Xinjun Zhang , Miao Jin , Lei Chen , Kun Yang , Shuo Hao
{"title":"Study on the interlayer and interphase multiple coordination deformation mechanism of Fe-20.4Cr-4.7Mn-0.27N duplex stainless steel with gradient heterostructure","authors":"Lingxiao Li , Tingsong Yang , Zhilei Liu , Yanfeng Feng , Xinjun Zhang , Miao Jin , Lei Chen , Kun Yang , Shuo Hao","doi":"10.1016/j.apsusc.2025.163309","DOIUrl":"10.1016/j.apsusc.2025.163309","url":null,"abstract":"<div><div>In this work, ultrasonic rolling treatment was conducted on the surface (USRT) of the Fe-20.4Cr-4.7Mn-0.27N duplex stainless steel plate for 6 passes, its influences on the tensile deformation and damage behaviors were clarified by means of XRD, EBSD, TEM, SEM, etc. The results show that the USRT introduced gradient heterostructure layers with a total volume ratio of about 27 % in the Fe-20.4Cr-4.7Mn-0.27N steel, the α’<sub>bcc</sub>-martensite proportion increases from 0 % in the base-material core to 5 % on the USRT surface. This leaded to an improvement in yield strength of 125 MPa, an increase in ultimate tensile strength of 17 MPa and a decrease in total elongation of 20 %. Besides, a further increase in α’<sub>bcc</sub>-martensite proportion of 35 %–38 % was shown in austenite throughout the USRT specimen after tensile fracture. While in ferrite, the dislocation activity in the USRT layer was obviously weaker than that in the base-material core during tensile deformation. The complex coordination deformation behavior is closely associated with the plasticity partitioning difference between the heterogeneous phases and between the heterogeneous layers. This finally leaded to different damage characteristics on the USRT surface from that in the as-annealed specimen.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"701 ","pages":"Article 163309"},"PeriodicalIF":6.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shuaiqi Lv , Zheyi Ni , Leyi Liu , Sihao Jiang , Mengru Shan , Yanqing Cong , Shiwen Lv , Guoqing Wang , Jing Xu , Yi Zhang
{"title":"Degradation of pollutants by electrically activated peroxydisulfate with Cu-FeOCl/MWCNTs-COOH/PTFE electrochemical membranes","authors":"Shuaiqi Lv , Zheyi Ni , Leyi Liu , Sihao Jiang , Mengru Shan , Yanqing Cong , Shiwen Lv , Guoqing Wang , Jing Xu , Yi Zhang","doi":"10.1016/j.apsusc.2025.163312","DOIUrl":"10.1016/j.apsusc.2025.163312","url":null,"abstract":"<div><div>Cu-FeOCl catalyst loaded onto Carboxylated multiwalled carbon nanotubes-polytetrafluoroethylene membranes (MWCNTs-COOH/PTFE) by high temperature pyrolysis to form Cu-FeOCl/MWCNTs-COOH/PTFE electrode. The Scanning Electron Microscope results show that the surface of the material shows a layered structure with large specific surface area. And it can be observed by X-Ray Diffraction, X-ray photoelectron spectroscopy and Fourier Transform Infrared Spectrometer that the doping of Cu affects the energy bands and crystallographic changes among other elements. Degradation of 98 % was achieved by electrically activating peroxydisulfate and sequestering sulfamethoxazole (SMX) in the flow system, and 92 % within 60 min in the immobility reaction. The flux of the membrane against bovine serum albumin and the recovery of the degradation rate after cyclic flux testing were also explored. In addition, the electrode is applied to the degradation of pollutants in the muddy water. Through the synergistic action of anodic oxidation and cathodic activation of PDS, active species such as hydroxyl radical (<sup><img></sup>OH), sulfate radicals (SO<sub>4</sub><sup><img>−</sup>), and superoxide radicals (O<sub>2</sub><sup><img>−</sup>) are generated in the reaction system, accompanied by the generation of high valence metals in the anode. Fe-Cu bimetallic catalysts for electrochemical activation of PDS for pollutant degradation is a feasible and efficient material.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"701 ","pages":"Article 163312"},"PeriodicalIF":6.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hao Zhang , Tianze Ren , Xiuming Bu , Chuqian Xiao , Shaoyan Wang , Di Yin , Xiulan Hu , Johnny C. Ho , Xianying Wang
{"title":"Unveiling the heterogeneous structure of FeCoNiPdCu High-Entropy Alloy: A case study on electrochemical nitrate reduction","authors":"Hao Zhang , Tianze Ren , Xiuming Bu , Chuqian Xiao , Shaoyan Wang , Di Yin , Xiulan Hu , Johnny C. Ho , Xianying Wang","doi":"10.1016/j.apsusc.2025.163269","DOIUrl":"10.1016/j.apsusc.2025.163269","url":null,"abstract":"<div><div>Recently, high-entropy nanoalloys (HEA) had attracted significant interest in various potential catalytic applications due to their unique high-entropy effect. However, in most previous studies, the successful preparation of single-phase HEA has been identified primarily through X-ray diffraction (XRD) and inductively coupled plasma mass spectrometry, often neglecting the presence of minor secondary phases owing to the spatially averaged information provided by XRD. In this work, using FeCoNiPdCu HEA applied to an electrochemical nitrate reduction reaction (NO<sub>3</sub>RR) as an example, we confirmed that trace amounts of oxygen induced the formation of a FeCoNiPdCu high-entropy oxide/FeCo oxide@NiPdCu alloy/FeCoNiPdCu HEA three-layer heterogeneous structure, achieving a Faradaic efficiency of 95.16% at an applied potential of −0.7 V vs. RHE. Moreover, by modifying the oxygen content, the element distribution across the entire HEA can be tuned owing to differences in oxide formation enthalpy, further affecting catalytic activity and selectivity. Our work deepens the understanding of HEA structures and provides insights into the active sites and corresponding catalytic mechanisms.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"702 ","pages":"Article 163269"},"PeriodicalIF":6.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Environmentally-friendly preparation nanometer Fe-Al solid solution alloy coatings on mild steel by electrodeposition in AlCl3-BMIC ionic liquid","authors":"Anan Song, Cunying Xu, Tongjiang Tian, Xiuling Yan, Yixin Hua, Qibo Zhang","doi":"10.1016/j.apsusc.2025.163296","DOIUrl":"10.1016/j.apsusc.2025.163296","url":null,"abstract":"<div><div>The formation of Fe-Al solid solutions can significantly enhance their corrosion resistance owing to the homogeneous microstructure. However, preparation high-iron-content alloys with solid solutions remains a considerable challenge. In this study, Fe-Al alloy solid solutions with high Fe content were successfully prepared via electrodeposition from an acidic 1-butyl-3-methylimidazolium chloroaluminate (AlCl<sub>3</sub>-BMIC) ionic liquid (IL) containing ferrous chloride (FeCl<sub>2</sub>). FeCl<sub>2</sub> was dissolved in the acidic AlCl<sub>3</sub>-BMIC IL to form complex [Fe(AlCl<sub>4</sub>)<sub>4</sub>]<sup>2-</sup>, alongside the well-known [Al<sub>2</sub>Cl<sub>7</sub>]<sup>−</sup> species, facilitating the co-deposition of Fe-Al alloy. The electrodeposition process of Al-Fe alloys was observed to be a normal co-deposition, where the presence of Fe(II) inhibits the reduction of [Al<sub>2</sub>Cl<sub>7</sub>]<sup>−</sup>, resulting in Fe content consistently exceeding 50 at%. During electrodeposition, increasing temperature and decreasing current density resulted in higher Fe content in the Fe-Al alloy. By adjusting the current density and temperature, Fe-Al alloys with diverse microstructures, including microspheres, staghorn coral, and pagoda-like structures, were successfully fabricated. The resultant Fe-Al alloys with Fe content between 39.2 at% and 76.3 at%, exhibit solid solutions, and they evolves from a dual-phase mixture of Fe(Al) and Al(Fe) solid solutions to a single-phase Fe(Al) solid solution as the Fe is up to 76.3 at%. Notably, the alloy coatings containing 61.6 at% Fe, composed of polycrystalline particles with an average grain size of 10.75 nm, demonstrated superior anti-corrosion performance compared to pure Al coatings. The enhanced anti-corrosion properties of the Fe-Al alloy coatings on mild steel can be attributed to several factors: the absence of intermetallic compounds, the extended solubility of Fe and Al within the Al-based and Fe-based solid solutions, and the compact structure made of nanoparticles. Accordingly, the combination of electrodeposition techniques with solid-solution alloy offers a promising approach for effective chemical protection on iron-based material surfaces.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"701 ","pages":"Article 163296"},"PeriodicalIF":6.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Minjeong Kweon , Chaehyun Park , Debananda Mohapatra , Sang Bok Kim , Jong-Seong Bae , Taehoon Cheon , Soo-Hyun Kim
{"title":"Yttrium carbide thin film as an emerging transition metal carbide Prepared by plasma-enhanced atomic layer deposition for Dual diffusion barrier applications into Cu and Ru metallization","authors":"Minjeong Kweon , Chaehyun Park , Debananda Mohapatra , Sang Bok Kim , Jong-Seong Bae , Taehoon Cheon , Soo-Hyun Kim","doi":"10.1016/j.apsusc.2025.163302","DOIUrl":"10.1016/j.apsusc.2025.163302","url":null,"abstract":"<div><div>Transition metal carbides (TMCs) often possess superior properties to transition metal nitrides (TMNs) in hardness, thermal stability, electrical conductivity, and chemical stability. However, developing an atomic layer deposition (ALD) process for these materials remains in its early stages, especially yttrium carbide (YC<sub>x</sub>) thin films, which remained largely unexplored. This study focuses on developing a plasma-enhanced ALD-YC<sub>x</sub> process for high-quality, uniform, and conformal thickness control TMCs while highlighting the advanced properties to utilize as advanced diffusion barriers via a novel Y-precursor. The critical experimental process parameters, Y-precursor, and H<sub>2</sub> plasma exposure times are thoroughly optimized to achieve highly conductive (∼415 μΩ·cm), high crystalline PEALD-Y<sub>2</sub>C thin films with a growth rate of ∼0.13 nm/cycle at 250 °C within the ALD temperature window (150–350 °C). Advanced aberration-corrected electron microscopies, electron diffractions, and spectroscopic techniques confirmed the formation of a nanocrystalline rhombohedral phase, C-to-Y ratio ∼0.46, 4.63 g/cm<sup>3</sup> density, and excellent step coverage (95%) of a trench structure with an aspect ratio of ∼1.5 and a bottom width of ∼265 nm. The post-annealed PEALD-Y<sub>2</sub>C films maintained stable thermal and crystallographic properties, exhibiting effective dual diffusion barrier performance for Cu and Ru (∼40 nm) up to 900 °C, emphasizing its importance as interconnects in advanced semiconductor devices.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"701 ","pages":"Article 163302"},"PeriodicalIF":6.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yankun Huo , Hongjie Wang , Yajiao He , Wenyuan Liu , Changfeng Ke , Jun Cheng
{"title":"Enhancing surface insulation performance of insulators through copolymer coating rich in delocalized electrons","authors":"Yankun Huo , Hongjie Wang , Yajiao He , Wenyuan Liu , Changfeng Ke , Jun Cheng","doi":"10.1016/j.apsusc.2025.163300","DOIUrl":"10.1016/j.apsusc.2025.163300","url":null,"abstract":"<div><div>Weak surface insulation performance of the vacuum insulators is a bottleneck problem of the large pulsed power devices. Recent studies have found that molecular group containing delocalized electrons is able to decrease the secondary electron emission yield (SEY) and increase the surface insulation performance of the vacuum insulators. Therefore, in this paper, a kind of copolymer coating consisting of dopamine and aniline is designed and in situ synthesized on the surface of alumina insulators to introduce delocalized electrons so as to improve the surface insulation performance. Influence of the different dopamine-aniline molar ratios of the copolymer coating on the SEY and surface insulation performance is studied. The results show that the copolymer coating with molar ratios of 1:1 can endow alumina insulators the lowest SEY and highest surface insulation performance than other molar ratios steadily. Further synthesizing the copolymer with dopamine-aniline molar ratios of 1:1 on the surface of several polymer insulators can also improve the surface insulation performance, which demonstrate the wide applicability of the electron-delocalized copolymer coating in improving the surface insulation performance.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"702 ","pages":"Article 163300"},"PeriodicalIF":6.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuxuan Shen, Mei Bai, Weiyu Fang, Xingyu Zhong, Xiulan Hu
{"title":"Multi-interfacial heterojunctions Fe3O4@NiCo2O4/NiCoP as efficient electrocatalysts for urea-assisted rechargeable Zn-air batteries","authors":"Yuxuan Shen, Mei Bai, Weiyu Fang, Xingyu Zhong, Xiulan Hu","doi":"10.1016/j.apsusc.2025.163301","DOIUrl":"10.1016/j.apsusc.2025.163301","url":null,"abstract":"<div><div>The development of Zn-air batteries (ZABs) is crucial to alleviate conventional fossil energy shortages and environmental problems. However, the slow thermodynamic process of the oxygen evolution reaction (OER) impedes its application. Urea oxidation reaction (UOR), substituting for OER, offers a thermodynamically favorable alternative and is useful for treating urea waste streams. However, both reactions suffer from slow kinetics and catalysts are urgently required to accelerate the reaction. In this study, a bifunctional sea urchin-shaped catalyst Fe<sub>3</sub>O<sub>4</sub>@NiCo<sub>2</sub>O<sub>4</sub>/NiCoP synthesis involved a two-step hydrothermal and phosphatization. Its heterogeneous structure and defects produced by the introduction of P enhance the catalytic performance of both OER and UOR. The catalyst can produce 10 mA cm<sup>−2</sup> with an OER reaction potential of only 1.47 V, which outperforms commercial RuO<sub>2</sub>, and a UOR reaction potential of 1.344 V. ZAB and urea-assisted ZAB (uZAB) assembled by this catalyst have low charging/discharging voltage gaps of 0.69 V and 0.50 V, respectively. In addition, uZAB has a long cycle life (600 cycles) and high energy conversion efficiency (70.8 %). This work presents a uncomplicated and practical way to fabricate new OER and UOR electrocatalysts with good performance and simultaneously deepens the research on Zn-air batteries.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"701 ","pages":"Article 163301"},"PeriodicalIF":6.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Unveiling CMAS corrosion mechanism on the surface of a novel mid-entropy Hf-Ta ceramic for thermal barrier coatings","authors":"Fanwei Meng , Fuxing Ye , Tianyuan Luo , Yuan Yao","doi":"10.1016/j.apsusc.2025.163310","DOIUrl":"10.1016/j.apsusc.2025.163310","url":null,"abstract":"<div><div>Introducing the concept of entropy has gradually provided novel perspectives for enhancing the properties of ceramic materials. In this study, the CMAS corrosion behavior on the surface of a mid-entropy ceramic (Y<sub>0.3</sub>Gd<sub>0.3</sub>Yb<sub>0.4</sub>)<sub>7</sub>(Hf<sub>0.5</sub>Ta<sub>0.5</sub>)<sub>6</sub>O<sub>24</sub> within the temperature range from 1300 ℃ to 1500 ℃ was investigated. During corrosion, the diffusion and transport of matter were inhibited by the more severe lattice distortions induced by the large ionic radius difference. The sluggish diffusion weakens the CMAS corrosion reaction, improving corrosion resistance. Additionally, the preferential breakage of Ta-O bonds led to the pre-generation of Ca<sub>2</sub>Ta<sub>2</sub>O<sub>7</sub>, which has a lower formation enthalpy. A comparison with rare earth hafnates reveals that the doping of Ta retards the generation of the apatite phase, thereby enhancing corrosion reaction inertness with CMAS melt.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"702 ","pages":"Article 163310"},"PeriodicalIF":6.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Linyun Zhong, Luyao Zhang, Xixin Duan, Wenbiao Xu, Dan Zhang
{"title":"Enhanced degradation of Perfluorooctanoic acid from water using AlPMo-X@ZIF-67: Leveraging Al⋅⋅⋅F formation and PMS activation","authors":"Linyun Zhong, Luyao Zhang, Xixin Duan, Wenbiao Xu, Dan Zhang","doi":"10.1016/j.apsusc.2025.163299","DOIUrl":"10.1016/j.apsusc.2025.163299","url":null,"abstract":"<div><div>To address the persistent challenge of perfluorooctanoic acid (PFOA) contamination in water, we developed a multifunctional catalyst, AlH<sub>3</sub>P<sub>2</sub>Mo<sub>18</sub>-X@ZIF-67 (abbreviated as AlPMo-X@ZIF-67, where X denotes the amount of AlPMo), which integrates aluminum-enhanced fluorine affinity, Dawson-type polyoxometalate-mediated multi-electron redox cycling, and ZIF-67-derived nanoconfinement effects. The catalyst was systematically evaluated for PFOA removal efficiency, key influencing factors (e.g., reaction time, pH, initial concentration, and catalyst dosage), and degradation mechanisms. The results revealed that the synergistic effect of PFOA adsorption and reactive species action was critical for effective degradation. Specifically, Al<sup>3+</sup> sites immobilized PFOA through Al⋅⋅⋅F coordination, weakening the C–F bond, while Mo<sup>5+</sup>/Co<sup>2</sup><sup>+</sup> cooperatively activated peroxymonosulfate (PMS) to generate SO<sub>4</sub>⋅<sup>–</sup>, ⋅OH, O<sub>2</sub>⋅<sup>–</sup>, and <sup>1</sup>O<sub>2</sub>. Within the nanoconfined environment, PFOA underwent stepwise degradation, involving adsorption-induced C–F bond weakening, decarboxylation, hydroxylation, HF elimination, and chain-shortened hydrolysis. This multi-mechanistic approach enabled 96.4 % PFOA removal within 30 min (10 g/L catalyst, 30 g/L PMS, pH 5, 55 °C) with 48.1 % defluorination in 4 h. Additionally, the reduction in acute and chronic toxicity and the catalyst’s high stability highlighted its potential for practical water treatment applications. This work provided a significant advancement in persistent pollutant remediation by integrating molecular recognition, bond activation, and nanoconfinement catalysis.</div></div>","PeriodicalId":247,"journal":{"name":"Applied Surface Science","volume":"701 ","pages":"Article 163299"},"PeriodicalIF":6.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143846882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}