Pub Date : 2024-06-17DOI: 10.1016/j.apsadv.2024.100617
Elham Aghajanpour Amiri , Reza Norouzbeigi , Elmira Velayi
Superhydrophobic/Icephobic tin oxide honeycomb-like nanostructures were synthesized on copper surfaces via facile controlled hydrothermal method. Effects of two crucial fabrication parameters including etching treatment variables and presence the seed layer, on the morphology and wettability of the resulted coating were determined. The chemical composition, wettability characteristics, and topographical properties of the samples were characterized by FE-SEM, stylus profilometry, contact angle measurement, and ATR-FTIR analyses. The wettability evaluations confirmed that the tin oxide deposited on the copper oxide (seed layer) exhibited excellent superhydrophobic properties. The prepared hierarchical surfaces showed high water contact angles (CA) as well as 169. with a contact angle hysteresis (CAH) of 5°± 1°. Moreover, the results confirmed that the etching treatment and the presence of the seed layer can promote the morphology to a uniform state. The ice adhesion strength of the obtained superhydrophobic surfaces reached to 30.4 kPa, showing an excellent ice-phobicity. The mechanical resistance and/or sustainability of the optimized sample was also passed successfully under 10 abrasion test cycles.
{"title":"Ice-phobic honeycomb-like nano SnO2 surfaces: Effect of pretreatment process on sustainable superhydrophobicity","authors":"Elham Aghajanpour Amiri , Reza Norouzbeigi , Elmira Velayi","doi":"10.1016/j.apsadv.2024.100617","DOIUrl":"https://doi.org/10.1016/j.apsadv.2024.100617","url":null,"abstract":"<div><p>Superhydrophobic/Icephobic tin oxide honeycomb-like nanostructures were synthesized on copper surfaces via facile controlled hydrothermal method. Effects of two crucial fabrication parameters including etching treatment variables and presence the seed layer, on the morphology and wettability of the resulted coating were determined. The chemical composition, wettability characteristics, and topographical properties of the samples were characterized by FE-SEM, stylus profilometry, contact angle measurement, and ATR-FTIR analyses. The wettability evaluations confirmed that the tin oxide deposited on the copper oxide (seed layer) exhibited excellent superhydrophobic properties. The prepared hierarchical surfaces showed high water contact angles (CA) as well as 169. <span><math><mrow><msup><mn>5</mn><mo>∘</mo></msup><mo>±</mo><msup><mn>1</mn><mo>∘</mo></msup></mrow></math></span> with a contact angle hysteresis (CAH) of 5°± 1°. Moreover, the results confirmed that the etching treatment and the presence of the seed layer can promote the morphology to a uniform state. The ice adhesion strength of the obtained superhydrophobic surfaces reached to 30.4 kPa, showing an excellent ice-phobicity. The mechanical resistance and/or sustainability of the optimized sample was also passed successfully under 10 abrasion test cycles.</p></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266652392400045X/pdfft?md5=590f735fdec880efbe4f9a94557674c4&pid=1-s2.0-S266652392400045X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141423723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-14DOI: 10.1016/j.apsadv.2024.100614
Mohamad Ayoub , Abdul Hai Alami , Mohammad Ali Abdelkareem , A.G. Olabi
In this work, oxygen reduction reaction (ORR) catalysts were developed from a precursor of spent coffee ground-based biochar. Nitrogen doping was achieved via urea addition preceding a pyrolysis synthesis process, yielding nitrogen-doped biochar (NDB). Cobalt was deposited onto the NDB surface using a non-conventional ball-milling procedure. The microstructure of the synthesized samples was studied through Scanning Electron Microscopy (SEM), where a rather distorted surface, highlighted by prominent wrinkles (which doubled the surface area at 50.58 m2/g), was shown for nitrogen-doped samples. Moreover, the high energy ball-milling technique shows an almost perfect coverage of cobalt nanoparticles on the biochar surface through SEM/EDS and Raman results. Additionally, electrochemical testing was conducted using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Cyclic voltammetry measurements conducted under nitrogen (inert) and oxygen-saturated alkaline solution (0.1 M KOH) conditions showed that nitrogen doping enhances the oxygen reduction reaction current (-1 vs -0.59 mA.cm−1 at -0.3 V vs Hg/HgO) and slightly reduces the onset potential compared to pristine biochar. Depositing cobalt onto the NDB surface had a minor adverse effect on the onset potential, but significantly increased the oxygen reduction reaction current, reaching a value of -2.09 mA.cm−2 at -0.3 V vs Hg/HgO. All catalysts were compared to a commercial carbon supported platinum catalyst (Pt10%C) to showcase the potential room of improvement for the developed catalysts.
在这项研究中,利用废咖啡渣生物炭为前驱体开发了氧还原反应(ORR)催化剂。在热解合成过程之前,通过添加尿素实现了氮掺杂,得到了氮掺杂生物炭(NDB)。采用非常规球磨程序将钴沉积到 NDB 表面。通过扫描电子显微镜(SEM)研究了合成样品的微观结构,结果显示掺氮样品的表面相当扭曲,突出表现为明显的皱纹(使表面积增加了一倍,达到 50.58 m2/g)。此外,高能球磨技术的 SEM/EDS 和拉曼结果表明,钴纳米颗粒几乎完美地覆盖了生物炭表面。此外,还使用循环伏安法(CV)和电化学阻抗谱法(EIS)进行了电化学测试。在氮气(惰性)和氧气饱和碱性溶液(0.1 M KOH)条件下进行的循环伏安测量表明,与原始生物炭相比,氮掺杂增强了氧还原反应电流(-1 vs -0.59 mA.cm-1 at -0.3 V vs Hg/HgO),并略微降低了起始电位。在 NDB 表面沉积钴对起始电位的不利影响较小,但却显著提高了氧还原反应电流,在 -0.3 V 对 Hg/HgO 时达到 -2.09 mA.cm-2 的值。所有催化剂都与商用碳支撑铂催化剂(Pt10%C)进行了比较,以展示所开发催化剂的潜在改进空间。
{"title":"Nitrogen-functionalized catalyst synthesized using spent coffee ground biochar-cobalt hybrid for oxygen reduction reaction via pyrolysis and ball-milling","authors":"Mohamad Ayoub , Abdul Hai Alami , Mohammad Ali Abdelkareem , A.G. Olabi","doi":"10.1016/j.apsadv.2024.100614","DOIUrl":"https://doi.org/10.1016/j.apsadv.2024.100614","url":null,"abstract":"<div><p>In this work, oxygen reduction reaction (ORR) catalysts were developed from a precursor of spent coffee ground-based biochar. Nitrogen doping was achieved via urea addition preceding a pyrolysis synthesis process, yielding nitrogen-doped biochar (NDB). Cobalt was deposited onto the NDB surface using a non-conventional ball-milling procedure. The microstructure of the synthesized samples was studied through Scanning Electron Microscopy (SEM), where a rather distorted surface, highlighted by prominent wrinkles (which doubled the surface area at 50.58 m<sup>2</sup>/g), was shown for nitrogen-doped samples. Moreover, the high energy ball-milling technique shows an almost perfect coverage of cobalt nanoparticles on the biochar surface through SEM/EDS and Raman results. Additionally, electrochemical testing was conducted using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Cyclic voltammetry measurements conducted under nitrogen (inert) and oxygen-saturated alkaline solution (0.1 M KOH) conditions showed that nitrogen doping enhances the oxygen reduction reaction current (-1 vs -0.59 mA.cm<sup>−1</sup> at -0.3 V vs Hg/HgO) and slightly reduces the onset potential compared to pristine biochar. Depositing cobalt onto the NDB surface had a minor adverse effect on the onset potential, but significantly increased the oxygen reduction reaction current, reaching a value of -2.09 mA.cm<sup>−2</sup> at -0.3 V vs Hg/HgO. All catalysts were compared to a commercial carbon supported platinum catalyst (Pt10%C) to showcase the potential room of improvement for the developed catalysts.</p></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666523924000424/pdfft?md5=55053a2933f43bf01ae3580eca70ed87&pid=1-s2.0-S2666523924000424-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141322809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-07DOI: 10.1016/j.apsadv.2024.100613
Amal L. Olatibi , Nadiah Y. Aldaleeli , Nafla ELtamimi , Khaled A. Elsayed , Nabil A. Abdel Ghany , Asmaa Elhassan
In this study the heavy metals (Cu2+, Pb2+, Hg+2) were removed from waste water using two types of sorbents, namely, MoO3 and MoO3 doped with 12 %Y2O3 were synthesized by solgel method. The as-prepared oxides were characterized using X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). A combination of quantitative and qualitative analysis techqnieus, portable X-ray fluorescence (pXRF) and laser-induced breakdown spectroscopy (LIBS) were used to evaluate the removing efficency. Calibration curves were performed to elucidate the limit of detection (LOD) of the Laser-Induced Breakdown Spectroscopy (LIBS) technique for the removal process The LOD were 1.65, 2–21 and 0.98 ppm for Cu, Pb and Hg respectively. The results indicated that the Y2O3-doped α-MoO3 has a consistently greater removal efficiency compared to MoO3. The removal effecieny of Hg2+, Pb2+ and Cu2+ was 95 %, 33 % and 21 % respectively with MoO3 while it was 98 % 63 % 35 % for MoO3 doped Y2O3, The results proved also that MoO3 and MoO3 doped Y2O3 nanoparticles can be utilized as cost effective adsorbent material for heavy metal removal in wastewater. The study showed the potential of using Laser-Induced Breakdown Spectroscopy (LIBS) in environmental applications.
{"title":"Utilizing MoO3, MoO3 doped Y2O3 for heavy metals (Hg, Pb, Cu) removal from wastewater monitored by p-XRF and LIBS techniques","authors":"Amal L. Olatibi , Nadiah Y. Aldaleeli , Nafla ELtamimi , Khaled A. Elsayed , Nabil A. Abdel Ghany , Asmaa Elhassan","doi":"10.1016/j.apsadv.2024.100613","DOIUrl":"https://doi.org/10.1016/j.apsadv.2024.100613","url":null,"abstract":"<div><p>In this study the heavy metals (Cu<sup>2+</sup>, Pb<sup>2+</sup>, Hg<sup>+2</sup>) were removed from waste water using two types of sorbents, namely, MoO<sub>3</sub> and MoO<sub>3</sub> doped with 12 %Y<sub>2</sub>O<sub>3</sub> were synthesized by solgel method. The as-prepared oxides were characterized using X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). A combination of quantitative and qualitative analysis techqnieus, portable X-ray fluorescence (pXRF) and laser-induced breakdown spectroscopy (LIBS) were used to evaluate the removing efficency. Calibration curves were performed to elucidate the limit of detection (LOD) of the Laser-Induced Breakdown Spectroscopy (LIBS) technique for the removal process The LOD were 1.65, 2–21 and 0.98 ppm for Cu, Pb and Hg respectively. The results indicated that the Y<sub>2</sub>O<sub>3</sub>-doped α-MoO<sub>3</sub> has a consistently greater removal efficiency compared to MoO<sub>3</sub>. The removal effecieny of Hg<sup>2+</sup>, Pb<sup>2+</sup> and Cu<sup>2+</sup> was 95 %, 33 % and 21 % respectively with MoO<sub>3</sub> while it was 98 % 63 % 35 % for MoO<sub>3</sub> doped Y<sub>2</sub>O<sub>3</sub>, The results proved also that MoO<sub>3</sub> and MoO<sub>3</sub> doped Y<sub>2</sub>O<sub>3</sub> nanoparticles can be utilized as cost effective adsorbent material for heavy metal removal in wastewater. The study showed the potential of using Laser-Induced Breakdown Spectroscopy (LIBS) in environmental applications.</p></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666523924000412/pdfft?md5=713c20b59ed2f05845f813779ee36bbf&pid=1-s2.0-S2666523924000412-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141286564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-06-07DOI: 10.1016/j.apsadv.2024.100615
Roman Gabor , Ladislav Cvrček , Marie Kudrnová , Josef Hlinka , Marek Večeř , Matěj Buřil , Jan Walter , Miha Čekada , Aljaž Drnovšek , Petr Unucka , Kateřina Mamulová Kutláková , Oldřich Motyka , Jana Seidlerová
The study focuses on an innovative process for the use of a ZrN coating on Ti6Al4V alloy for orthopaedic bone implants. The preparation process combines the technology of physical vapour deposition (PVD) and micro-arc oxidation (MAO) to achieve hydrophobic properties, improved corrosion resistance and enhanced coating adhesion to Ti6Al4V alloy. An alkaline electrolyte and different microarc discharge intensities were used to prepare MAO coatings. The evaluation of the structure and topography of the coatings was performed using SEM with XRPD, EDX, and XPS analysis. The prepared oxide coatings Zr, ZrSiO4, and ZrTiO4 increase the corrosion potential depending on the applied source frequency and thus increase the corrosion resistance of the hybrid system. At the same time, the formation of oxide phases leads to changes in surface topography associated with increasing friction coefficient and better wear resistance.
{"title":"ZrN coating as a source for the synthesis of a new hybrid ceramic layer","authors":"Roman Gabor , Ladislav Cvrček , Marie Kudrnová , Josef Hlinka , Marek Večeř , Matěj Buřil , Jan Walter , Miha Čekada , Aljaž Drnovšek , Petr Unucka , Kateřina Mamulová Kutláková , Oldřich Motyka , Jana Seidlerová","doi":"10.1016/j.apsadv.2024.100615","DOIUrl":"https://doi.org/10.1016/j.apsadv.2024.100615","url":null,"abstract":"<div><p>The study focuses on an innovative process for the use of a ZrN coating on Ti6Al4V alloy for orthopaedic bone implants. The preparation process combines the technology of physical vapour deposition (PVD) and micro-arc oxidation (MAO) to achieve hydrophobic properties, improved corrosion resistance and enhanced coating adhesion to Ti6Al4V alloy. An alkaline electrolyte and different microarc discharge intensities were used to prepare MAO coatings. The evaluation of the structure and topography of the coatings was performed using SEM with XRPD, EDX, and XPS analysis. The prepared oxide coatings Zr, ZrSiO<sub>4</sub>, and ZrTiO<sub>4</sub> increase the corrosion potential depending on the applied source frequency and thus increase the corrosion resistance of the hybrid system. At the same time, the formation of oxide phases leads to changes in surface topography associated with increasing friction coefficient and better wear resistance.</p></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666523924000436/pdfft?md5=72155b8d1e39fff55cef8d7b300760ac&pid=1-s2.0-S2666523924000436-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141285968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-17DOI: 10.1016/j.apsadv.2024.100608
G. Murali Manoj , M. Shalini , K. Thenmozhi , Vinoth Kumar Ponnusamy , Shankar Hari
Magnetic nanomaterials (MNMs) with metallic and semiconducting properties are useful in energy conversion, energy storage, environmental, biomedical, agricultural applications thanks to their large surface area, charge carrier mobility, optical band structure, non-toxic nature, and ability to recover and recycle. However, their poor stability, agglomeration, lack of biocompatibility, fast electron-hole recombination, and leaching in acidic environments restrict bare MNMs for real-time applications. There are several approaches employed to overcome these issues, such as elemental doping, defect formation, nanocomposites, and surface functionalization. Among them, functionalization is one of the promising techniques to alter various properties of MNMs such as specific morphology, size, facet, crystalline phase, and electron mobility. Functionalized MNMs have been explored for various areas of research, including biomedical and environmental applications such as MRI, drug delivery, catalysis, solar hydrogen production, sensors, water and air purification. In this short perspective, promising advances in various functionalization strategies such as surface modification, amino functionalization, polymer functionalization, and biomolecule functionalization, techniques were consolidated, reviewed and their various applications are discussed in detail.
{"title":"Recent advancements in the surface modification and functionalization of magnetic nanomaterials","authors":"G. Murali Manoj , M. Shalini , K. Thenmozhi , Vinoth Kumar Ponnusamy , Shankar Hari","doi":"10.1016/j.apsadv.2024.100608","DOIUrl":"https://doi.org/10.1016/j.apsadv.2024.100608","url":null,"abstract":"<div><p>Magnetic nanomaterials (MNMs) with metallic and semiconducting properties are useful in energy conversion, energy storage, environmental, biomedical, agricultural applications thanks to their large surface area, charge carrier mobility, optical band structure, non-toxic nature, and ability to recover and recycle. However, their poor stability, agglomeration, lack of biocompatibility, fast electron-hole recombination, and leaching in acidic environments restrict bare MNMs for real-time applications. There are several approaches employed to overcome these issues, such as elemental doping, defect formation, nanocomposites, and surface functionalization. Among them, functionalization is one of the promising techniques to alter various properties of MNMs such as specific morphology, size, facet, crystalline phase, and electron mobility. Functionalized MNMs have been explored for various areas of research, including biomedical and environmental applications such as MRI, drug delivery, catalysis, solar hydrogen production, sensors, water and air purification. In this short perspective, promising advances in various functionalization strategies such as surface modification, amino functionalization, polymer functionalization, and biomolecule functionalization, techniques were consolidated, reviewed and their various applications are discussed in detail.</p></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666523924000369/pdfft?md5=cd0091d9a0e81be32d86f9b533e2c514&pid=1-s2.0-S2666523924000369-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140952267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-16DOI: 10.1016/j.apsadv.2024.100610
Mattia Fanetti, Katja Ferfolja, Sandra Gardonio, Matjaž Valant
In this work the interface between a Pt film and a Bi2Se3 (0001) surface is investigated using electron microscopy and microanalysis, in order to characterize the structure of the interface and verify if it is chemically stable or an interaction occurs. At room temperature, the Pt film is composed of small clusters (∼10 nm) and the interface is stable. However, already upon mild annealing (200 °C) the interface displays instability and forms an interfacial phase. The interfacial phase, not previously reported in literature, is a long-range ordered ternary Pt:Bi:Se phase aligned with the Bi2Se3 crystal, most probably an intermetallic compound. The presence of a new phase at Pt/Bi2Se3 interface, together with the possible effects on the topological surface states, has to be considered in all the applied studies where this interface is present, as well as in the models for theoretical studies.
{"title":"The interface between Pt and Bi2Se3: Instability and formation of a new ordered phase","authors":"Mattia Fanetti, Katja Ferfolja, Sandra Gardonio, Matjaž Valant","doi":"10.1016/j.apsadv.2024.100610","DOIUrl":"https://doi.org/10.1016/j.apsadv.2024.100610","url":null,"abstract":"<div><p>In this work the interface between a Pt film and a Bi<sub>2</sub>Se<sub>3</sub> (0001) surface is investigated using electron microscopy and microanalysis, in order to characterize the structure of the interface and verify if it is chemically stable or an interaction occurs. At room temperature, the Pt film is composed of small clusters (∼10 nm) and the interface is stable. However, already upon mild annealing (200 °C) the interface displays instability and forms an interfacial phase. The interfacial phase, not previously reported in literature, is a long-range ordered ternary Pt:Bi:Se phase aligned with the Bi<sub>2</sub>Se<sub>3</sub> crystal, most probably an intermetallic compound. The presence of a new phase at Pt/Bi<sub>2</sub>Se<sub>3</sub> interface, together with the possible effects on the topological surface states, has to be considered in all the applied studies where this interface is present, as well as in the models for theoretical studies.</p></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666523924000382/pdfft?md5=0fe609b3fff8e988f2b947afe471ac1d&pid=1-s2.0-S2666523924000382-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140951325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-11DOI: 10.1016/j.apsadv.2024.100606
Anh Truc Trinh , Anh Son Nguyen , Thu Thuy Thai , Nicolas Caussé , Nadine Pébère
In the present work, the corrosion inhibition of AA2024 by lithium salts (nitrate, oxalate and carbonate) is investigated by using both global and local electrochemical techniques. With LiNO3 (0.1 M), the anodic and cathodic current densities are lower and the impedance values higher by comparison with the results obtained in the presence of 0.1 M Li2C2O4 or 0.1 M Li2CO3. After 20 h of immersion in the electrolyte, SEM observations reveal the formation of thick films on the AA2024 surface in the presence of carbonate or oxalate, whereas a thin and denser film is formed in the presence of nitrate. Specifically, the Li2C2O4 addition, by increasing the pH of the electrolyte, induces significant alloy dissolution from the very beginning of immersion which contributes to the growth of a protective layer on the alloy surface, combining lithium, carbonate species and metal cations.
A self-healing effect by Li2C2O4 or Li2CO3 is shown by local impedance measurements on artificial scratches made on a water-based epoxy coating deposited on AA2024 plates, confirming their potential use, as inhibitive species, in organic coatings.
{"title":"A comparative study of lithium salts for the corrosion inhibition of 2024 aluminium alloy","authors":"Anh Truc Trinh , Anh Son Nguyen , Thu Thuy Thai , Nicolas Caussé , Nadine Pébère","doi":"10.1016/j.apsadv.2024.100606","DOIUrl":"https://doi.org/10.1016/j.apsadv.2024.100606","url":null,"abstract":"<div><p>In the present work, the corrosion inhibition of AA2024 by lithium salts (nitrate, oxalate and carbonate) is investigated by using both global and local electrochemical techniques. With LiNO<sub>3</sub> (0.1 M), the anodic and cathodic current densities are lower and the impedance values higher by comparison with the results obtained in the presence of 0.1 M Li<sub>2</sub>C<sub>2</sub>O<sub>4</sub> or 0.1 M Li<sub>2</sub>CO<sub>3</sub>. After 20 h of immersion in the electrolyte, SEM observations reveal the formation of thick films on the AA2024 surface in the presence of carbonate or oxalate, whereas a thin and denser film is formed in the presence of nitrate. Specifically, the Li<sub>2</sub>C<sub>2</sub>O<sub>4</sub> addition, by increasing the pH of the electrolyte, induces significant alloy dissolution from the very beginning of immersion which contributes to the growth of a protective layer on the alloy surface, combining lithium, carbonate species and metal cations.</p><p>A self-healing effect by Li<sub>2</sub>C<sub>2</sub>O<sub>4</sub> or Li<sub>2</sub>CO<sub>3</sub> is shown by local impedance measurements on artificial scratches made on a water-based epoxy coating deposited on AA2024 plates, confirming their potential use, as inhibitive species, in organic coatings.</p></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666523924000345/pdfft?md5=ea9e65b5604167e9a2995e365264f38e&pid=1-s2.0-S2666523924000345-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140906591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-10DOI: 10.1016/j.apsadv.2024.100609
Adriana Vulcu, Teodora Radu, Alexandru Turza, Camelia Berghian-Grosan
The development of electrocatalysts with high catalytic performance and low costs for oxygen reduction reaction (ORR) is still challenging. Herein, an overall solution for ORR in alkaline media, from the catalyst synthesis to catalyst regeneration and to the development of a rapid, reliable and easy approach for electrode surface evaluation, is presented. We focused on the development and characterization of an efficient material for ORR in alkaline media, α-Fe2O3 N-doped graphene (Fe-N-Gr). The associative pathway for the four electron transfer ORR mechanism is sustained by the Raman spectra recorded from the electrode surface. We highlighted the possibility of catalyst regeneration by a simple electrochemical method. After two regeneration rounds and 1500 cycles in O2-saturated 1 M NaOH, the catalyst still retains 40.8 % catalytic activity. Finally, as a part of the overall solution, we demonstrated that a methodology based on Raman spectroscopic measurements and machine learning algorithms can be applied for graphene-based catalysts lifetime investigation.
开发催化性能高、成本低的氧还原反应(ORR)电催化剂仍是一项挑战。本文介绍了碱性介质中氧还原反应的整体解决方案,包括从催化剂合成到催化剂再生,以及开发快速、可靠和简便的电极表面评估方法。我们重点研究了碱性介质中 ORR 的高效材料 α-Fe2O3 N 掺杂石墨烯(Fe-N-Gr)的开发和表征。电极表面记录的拉曼光谱证实了四电子转移 ORR 机制的关联途径。我们强调了通过简单的电化学方法进行催化剂再生的可能性。在氧气饱和的 1 M NaOH 中进行两轮再生和 1500 个循环后,催化剂仍保持 40.8% 的催化活性。最后,作为整体解决方案的一部分,我们证明了基于拉曼光谱测量和机器学习算法的方法可用于石墨烯基催化剂寿命调查。
{"title":"Iron-based graphene composite for oxygen reduction reaction in alkaline media: Electrocatalytic activity and lifetime evaluation","authors":"Adriana Vulcu, Teodora Radu, Alexandru Turza, Camelia Berghian-Grosan","doi":"10.1016/j.apsadv.2024.100609","DOIUrl":"https://doi.org/10.1016/j.apsadv.2024.100609","url":null,"abstract":"<div><p>The development of electrocatalysts with high catalytic performance and low costs for oxygen reduction reaction (ORR) is still challenging. Herein, an overall solution for ORR in alkaline media, from the catalyst synthesis to catalyst regeneration and to the development of a rapid, reliable and easy approach for electrode surface evaluation, is presented. We focused on the development and characterization of an efficient material for ORR in alkaline media, α-Fe<sub>2</sub>O<sub>3</sub> N-doped graphene (<strong>Fe-N-Gr</strong>). The associative pathway for the four electron transfer ORR mechanism is sustained by the Raman spectra recorded from the electrode surface. We highlighted the possibility of catalyst regeneration by a simple electrochemical method. After two regeneration rounds and 1500 cycles in O<sub>2</sub>-saturated 1 M NaOH, the catalyst still retains 40.8 % catalytic activity. Finally, as a part of the overall solution, we demonstrated that a methodology based on Raman spectroscopic measurements and machine learning algorithms can be applied for graphene-based catalysts lifetime investigation.</p></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666523924000370/pdfft?md5=e8741bb85e46bf7fd37b0a3d58867a2c&pid=1-s2.0-S2666523924000370-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140906592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mg-based alloys are used in various industrial sectors due to the unique combination of mechanical and biomedical behaviors. However, they are challenging in terms of corrosion protection and do not produce a protective oxide layer on their surface. The unregulated corrosion rate of these alloys restricts their application. One of the strategies that can provide a protective coating that prevents the direct contact of corrosive media with the substrates is coating on magnesium and its alloys. In recent years, MOF‒MOF-containing coatings have been investigated as a means of protecting various metal alloys against corrosion. The results show that these inhibitors have significantly reduced the rate of metal dissolution by affecting the kinetics of electrochemical reactions and greatly increasing corrosion resistance. So, these coatings are useful for increasing the corrosion resistance of magnesium alloys. Also, the anti-corrosion mechanisms and performance of MOFs in the coating matrix are discussed accordingly. This review article attempts to highlight the importance of MOFs for coating applications and enhancing corrosion resistance.
{"title":"Enhancing corrosion resistance in Mg‒based alloys through MOF‒incorporated coatings: A comprehensive review","authors":"Arash Fattah-alhosseini , Zahra Sangarimotlagh , Minoo Karbasi , Burak Dikici","doi":"10.1016/j.apsadv.2024.100607","DOIUrl":"https://doi.org/10.1016/j.apsadv.2024.100607","url":null,"abstract":"<div><p>Mg-based alloys are used in various industrial sectors due to the unique combination of mechanical and biomedical behaviors. However, they are challenging in terms of corrosion protection and do not produce a protective oxide layer on their surface. The unregulated corrosion rate of these alloys restricts their application. One of the strategies that can provide a protective coating that prevents the direct contact of corrosive media with the substrates is coating on magnesium and its alloys. In recent years, MOF‒MOF-containing coatings have been investigated as a means of protecting various metal alloys against corrosion. The results show that these inhibitors have significantly reduced the rate of metal dissolution by affecting the kinetics of electrochemical reactions and greatly increasing corrosion resistance. So, these coatings are useful for increasing the corrosion resistance of magnesium alloys. Also, the anti-corrosion mechanisms and performance of MOFs in the coating matrix are discussed accordingly. This review article attempts to highlight the importance of MOFs for coating applications and enhancing corrosion resistance.</p></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666523924000357/pdfft?md5=bfc0756bd68beabdd9f126ccdee5baf6&pid=1-s2.0-S2666523924000357-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140893911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The article discusses the function of green nanoparticles in preventing corrosion of different alloys such as copper, zinc, steel, and aluminium alloys. Green nanoparticles are characterized by their environmentally friendly and sustainable production methods, which emphasize using natural materials. Environmental issues have long been linked to traditional corrosion inhibitors, which has led to a shift towards more environmentally friendly alternatives. A potential remedy for these issues is the use of green nanoparticles, which are derived from renewable and biodegradable resources. Green nanoparticles support sustainability goals and have strong corrosion inhibition properties. Their combined role makes them essential players in a future where environmental awareness and material safety coexist. The review envisages a significant paradigm shift in critical industrial contexts, which calls for a robust and ecologically friendly approach to corrosion prevention. Green nanoparticles can potentially transform the field of materials protection entirely, and their investigation as corrosion inhibitors opens up new directions for study and development. In conclusion, this review highlights the crucial role of these nanoparticles in creating a sustainable future where creative solutions will enhance industrial productivity and environmental well-being. Finally, the prospects and difficulties of sustainably applying green nanoparticles to corrosion inhibition have also been explored.
{"title":"Green nanoparticles for advanced corrosion protection: Current perspectives and future prospects","authors":"Sandeep Yadav , Anirudh P.S. Raman , Madhur B. Singh , Iona Massey , Prashant Singh , Chandrabhan Verma , Akram AlFantazi","doi":"10.1016/j.apsadv.2024.100605","DOIUrl":"https://doi.org/10.1016/j.apsadv.2024.100605","url":null,"abstract":"<div><p>The article discusses the function of green nanoparticles in preventing corrosion of different alloys such as copper, zinc, steel, and aluminium alloys. Green nanoparticles are characterized by their environmentally friendly and sustainable production methods, which emphasize using natural materials. Environmental issues have long been linked to traditional corrosion inhibitors, which has led to a shift towards more environmentally friendly alternatives. A potential remedy for these issues is the use of green nanoparticles, which are derived from renewable and biodegradable resources. Green nanoparticles support sustainability goals and have strong corrosion inhibition properties. Their combined role makes them essential players in a future where environmental awareness and material safety coexist. The review envisages a significant paradigm shift in critical industrial contexts, which calls for a robust and ecologically friendly approach to corrosion prevention. Green nanoparticles can potentially transform the field of materials protection entirely, and their investigation as corrosion inhibitors opens up new directions for study and development. In conclusion, this review highlights the crucial role of these nanoparticles in creating a sustainable future where creative solutions will enhance industrial productivity and environmental well-being. Finally, the prospects and difficulties of sustainably applying green nanoparticles to corrosion inhibition have also been explored.</p></div>","PeriodicalId":34303,"journal":{"name":"Applied Surface Science Advances","volume":null,"pages":null},"PeriodicalIF":6.2,"publicationDate":"2024-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666523924000333/pdfft?md5=a89f4bb84d055993a0056faec357624a&pid=1-s2.0-S2666523924000333-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140816751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}