Pub Date : 2023-01-01DOI: 10.1016/j.chphma.2022.06.002
Tianyi Wang , Haikun Liu , Ani Dong , Rosalie Hocking , Chenghua Sun
Partial oxidation of methane is a promising alternative strategy for methanol production under mild reaction conditions; however, significant challenges hinder the development of appropriate catalysts. In this study, based on first-principles calculations, we demonstrate that a single Fe atom supported on anatase TiO2(001) provides double active sites (Fe and Ti5C) to activate gas-phase O2 and form O-assisted intermediates. The triple state Fe-O/TiO2(001) system exhibited better activity for methane activation (ΔGmax = 1.02 eV). Our findings offer new insights into the design of non-noble-3d transition metal single-atom catalysts on TiO2(001) for partial methane oxidation via an inexpensive O2 oxidant under mild reaction conditions.
{"title":"Exploration of single Fe atom supported on anatase TiO2(001) for methane oxidation: A DFT study","authors":"Tianyi Wang , Haikun Liu , Ani Dong , Rosalie Hocking , Chenghua Sun","doi":"10.1016/j.chphma.2022.06.002","DOIUrl":"https://doi.org/10.1016/j.chphma.2022.06.002","url":null,"abstract":"<div><p>Partial oxidation of methane is a promising alternative strategy for methanol production under mild reaction conditions; however, significant challenges hinder the development of appropriate catalysts. In this study, based on first-principles calculations, we demonstrate that a single Fe atom supported on anatase TiO<sub>2</sub>(001) provides double active sites (Fe and Ti<sub>5C</sub>) to activate gas-phase O<sub>2</sub> and form O-assisted intermediates. The triple state Fe-O/TiO<sub>2</sub>(001) system exhibited better activity for methane activation (Δ<em>G</em><sub>max</sub> = 1.02 eV). Our findings offer new insights into the design of non-noble-3<em>d</em> transition metal single-atom catalysts on TiO<sub>2</sub>(001) for partial methane oxidation via an inexpensive O<sub>2</sub> oxidant under mild reaction conditions.</p></div>","PeriodicalId":100236,"journal":{"name":"ChemPhysMater","volume":"2 1","pages":"Pages 90-96"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50193375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1016/j.chphma.2022.07.001
Guiming Niu , Li Zhao , Yandong Wang , Yanyan Jiang
A series of new nanobiotechnology-based methods have been developed toward achieving safe and efficient cancer treatment. Gold nanorods (AuNRs) have attracted increasing attention owing to their unique optical characteristics, good biocompatibility, and low toxicity, and they have thus been widely used in tumor treatment. In this study, an AuNR-based system was designed by attaching microRNA-192 (miR-192) to polydopamine-coated AuNRs (AuNR@PDA) to explore the possibility of combining genetic and photothermal therapies. RNA/AuNR@PDA exhibited an excellent thermal conversion efficiency under near-infrared (NIR) laser irradiation and excellent biocompatibility. Thus, photothermal therapy (PTT) was combined with gene therapy, which was effected by miR-192, a genetic drug that inhibits cancer cell growth. The combinatory treatment approach entailing the AuNRs-based drug carrier system exhibited encouraging antitumor efficacy.
{"title":"PDA/gold nanorod-based nanoparticles for synergistic genetic and photothermal combination therapy for cancer treatment","authors":"Guiming Niu , Li Zhao , Yandong Wang , Yanyan Jiang","doi":"10.1016/j.chphma.2022.07.001","DOIUrl":"https://doi.org/10.1016/j.chphma.2022.07.001","url":null,"abstract":"<div><p>A series of new nanobiotechnology-based methods have been developed toward achieving safe and efficient cancer treatment. Gold nanorods (AuNRs) have attracted increasing attention owing to their unique optical characteristics, good biocompatibility, and low toxicity, and they have thus been widely used in tumor treatment. In this study, an AuNR-based system was designed by attaching microRNA-192 (miR-192) to polydopamine-coated AuNRs (AuNR@PDA) to explore the possibility of combining genetic and photothermal therapies. RNA/AuNR@PDA exhibited an excellent thermal conversion efficiency under near-infrared (NIR) laser irradiation and excellent biocompatibility. Thus, photothermal therapy (PTT) was combined with gene therapy, which was effected by miR-192, a genetic drug that inhibits cancer cell growth. The combinatory treatment approach entailing the AuNRs-based drug carrier system exhibited encouraging antitumor efficacy.</p></div>","PeriodicalId":100236,"journal":{"name":"ChemPhysMater","volume":"2 1","pages":"Pages 83-89"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50193376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Photoelectrochemical (PEC) active interfaces exhibiting visible-light responses and good electron-transfer capabilities are key to the development of PEC biosensors. In this study, bioinspired polydopamine (PDA)–polyethyleneimine (PEI) hybrid films were designed to engineer inorganic semiconductors and construct PEC biosensing interfaces. The charge-transfer capability and visible-light-response property of PDA were combined with the electron-attracting ability of PEI to produce a synergistic PEC-enhancement effect. The achieved PEC-enhancement effect was versatile for photoanode and photocathode semiconductors. Further, the role of PEI doping was revealed via electrochemical investigations. Compared with the PDA sensing platform, the hybrid sensing interface offered by the PDA–PEI film exhibited enhanced analytical performances toward ascorbic acid (AA), achieving a larger detection range and a lower limit of detection.
{"title":"Synergistic enhancement effect of polydopamine–polyethyleneimine hybrid films for a visible-light photoelectrochemical biosensing interface","authors":"Jingkai Shan, Wenhao Gao, Xinyue Liu, Jinhui Feng, Li Dai, Huan Wang, Dawei Fan, Hongmin Ma, Qin Wei","doi":"10.1016/j.chphma.2022.04.005","DOIUrl":"https://doi.org/10.1016/j.chphma.2022.04.005","url":null,"abstract":"<div><p>Photoelectrochemical (PEC) active interfaces exhibiting visible-light responses and good electron-transfer capabilities are key to the development of PEC biosensors. In this study, bioinspired polydopamine (PDA)–polyethyleneimine (PEI) hybrid films were designed to engineer inorganic semiconductors and construct PEC biosensing interfaces. The charge-transfer capability and visible-light-response property of PDA were combined with the electron-attracting ability of PEI to produce a synergistic PEC-enhancement effect. The achieved PEC-enhancement effect was versatile for photoanode and photocathode semiconductors. Further, the role of PEI doping was revealed via electrochemical investigations. Compared with the PDA sensing platform, the hybrid sensing interface offered by the PDA–PEI film exhibited enhanced analytical performances toward ascorbic acid (AA), achieving a larger detection range and a lower limit of detection.</p></div>","PeriodicalId":100236,"journal":{"name":"ChemPhysMater","volume":"2 1","pages":"Pages 69-76"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50193372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1016/j.chphma.2022.03.005
Han Zhao , Fan Yang , Chongxing Li , Tong Li , Shuxian Zhang , Chengxiang Wang , Zhiwei Zhang , Rutao Wang
Silicon (Si) anodes with extremely high theoretical capacities are considered indispensable for next-generation high-energy lithium-ion batteries (LIBs). However, several intractable problems, including pulverization, poor electrical contact, and continuous side reactions caused by the large volume change of Si during lithiation/delithiation, lead to a short cycle life and poor rate capability, thus hindering the commercial use of Si anodes in LIBs. Two-dimensional (2D) Si with a unique graphene-like structure has a short ion diffusion pathway, small volume change during lithiation, and efficient redox site utilization, making it more promising than bulk Si or Si with other versatile structures for use in LIBs. Theoretical analysis demonstrated that the low energy barrier on the surface of 2D Si accelerates the transport of Li+. However, the issues surrounding 2D Si, including the tedious and user-unfriendly synthesis, ease of restacking, and atmospheric sensitivity, limit its practical applications, which are discussed in this review. Furthermore, possible solutions to these remaining challenges and new directions are provided, with the aim of designing practical and high-performance 2D Si anodes for next-generation LIBs.
{"title":"Progress and perspectives on two-dimensional silicon anodes for lithium-ion batteries","authors":"Han Zhao , Fan Yang , Chongxing Li , Tong Li , Shuxian Zhang , Chengxiang Wang , Zhiwei Zhang , Rutao Wang","doi":"10.1016/j.chphma.2022.03.005","DOIUrl":"https://doi.org/10.1016/j.chphma.2022.03.005","url":null,"abstract":"<div><p>Silicon (Si) anodes with extremely high theoretical capacities are considered indispensable for next-generation high-energy lithium-ion batteries (LIBs). However, several intractable problems, including pulverization, poor electrical contact, and continuous side reactions caused by the large volume change of Si during lithiation/delithiation, lead to a short cycle life and poor rate capability, thus hindering the commercial use of Si anodes in LIBs. Two-dimensional (2D) Si with a unique graphene-like structure has a short ion diffusion pathway, small volume change during lithiation, and efficient redox site utilization, making it more promising than bulk Si or Si with other versatile structures for use in LIBs. Theoretical analysis demonstrated that the low energy barrier on the surface of 2D Si accelerates the transport of Li<sup>+</sup>. However, the issues surrounding 2D Si, including the tedious and user-unfriendly synthesis, ease of restacking, and atmospheric sensitivity, limit its practical applications, which are discussed in this review. Furthermore, possible solutions to these remaining challenges and new directions are provided, with the aim of designing practical and high-performance 2D Si anodes for next-generation LIBs.</p></div>","PeriodicalId":100236,"journal":{"name":"ChemPhysMater","volume":"2 1","pages":"Pages 1-19"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50193416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1016/j.chphma.2022.04.001
Kaimin Zhao, Nairan Wang, Shengyuan Li, Guorong Zhou, Xinying Teng, Juan Xu, Yan Wang, Jianquan Li
The microstructural evolution and corrosion behavior of Ni62Nb33Zr5 bulk metallic glasses (BMGs) after annealing treatment (AT) at different crystallization temperatures and cryogenic treatment (CT) at −100 ℃ are experimentally investigated. Appropriate AT and CT can both improve the thermal stability and comprehensive corrosion resistance of as-cast BMG in 3.5 wt.% NaCl solution. The annealed and cryo-treated BMGs exhibit one more finite diffusion layer loop in the electrical equivalent circuit than the as-cast BMG, indicating the complexity of the corrosion behavior. Superior corrosion resistance is obtained in the cryo-treated BMG because the high degree of amorphization caused by CT reduces the structural inhomogeneity. Lower Cd and higher Rd values are obtained for the cryo-treated BMG, revealing the formation of a more stable passive film. Among the annealed BMGs, the fully crystallized sample exhibits a higher anti-corrosion performance owing to the existence of Nb-rich oxides in the crystallization products. The passive film is found to be composed mainly of Nb2O5 and ZrO2, demonstrating that Nb and Zr are conducive to reacting with oxygen to form a passive film. Based on the goal of maintaining a fully amorphous phase, appropriate CT causing structural homogeneity of the BMG is a simple and effective means to improve the comprehensive corrosion resistance.
{"title":"Corrosion behavior of Ni62Nb33Zr5 bulk metallic glasses after annealing and cryogenic treatments","authors":"Kaimin Zhao, Nairan Wang, Shengyuan Li, Guorong Zhou, Xinying Teng, Juan Xu, Yan Wang, Jianquan Li","doi":"10.1016/j.chphma.2022.04.001","DOIUrl":"https://doi.org/10.1016/j.chphma.2022.04.001","url":null,"abstract":"<div><p>The microstructural evolution and corrosion behavior of Ni<sub>62</sub>Nb<sub>33</sub>Zr<sub>5</sub> bulk metallic glasses (BMGs) after annealing treatment (AT) at different crystallization temperatures and cryogenic treatment (CT) at −100 ℃ are experimentally investigated. Appropriate AT and CT can both improve the thermal stability and comprehensive corrosion resistance of as-cast BMG in 3.5 wt.% NaCl solution. The annealed and cryo-treated BMGs exhibit one more finite diffusion layer loop in the electrical equivalent circuit than the as-cast BMG, indicating the complexity of the corrosion behavior. Superior corrosion resistance is obtained in the cryo-treated BMG because the high degree of amorphization caused by CT reduces the structural inhomogeneity. Lower <em>C</em><sub>d</sub> and higher <em>R</em><sub>d</sub> values are obtained for the cryo-treated BMG, revealing the formation of a more stable passive film. Among the annealed BMGs, the fully crystallized sample exhibits a higher anti-corrosion performance owing to the existence of Nb-rich oxides in the crystallization products. The passive film is found to be composed mainly of Nb<sub>2</sub>O<sub>5</sub> and ZrO<sub>2</sub>, demonstrating that Nb and Zr are conducive to reacting with oxygen to form a passive film. Based on the goal of maintaining a fully amorphous phase, appropriate CT causing structural homogeneity of the BMG is a simple and effective means to improve the comprehensive corrosion resistance.</p></div>","PeriodicalId":100236,"journal":{"name":"ChemPhysMater","volume":"2 1","pages":"Pages 58-68"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50193374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1016/j.chphma.2022.03.006
Boyuan Yu , Xin Zhao , Jiangfeng Ni , Feng Yang
Polyoxometalates (POMs) have drawn broad and intense interest due to their unique structure-dependent properties. The assembly of POM molecules into nanoarchitectures and superstructures can bridge the gap between micro-molecule and bulk POM materials and integrate the merits of molecule and materials that are widely used in catalysis, energy conversion, electronics, and bioapplications. The synthetic methodologies and applications of multiscale POM assemblies have been widely studied. In this review, we survey the POM-based multiscale assembly focusing on two aspects: the strategies for multiscale assembly of POMs and the emerging applications of POM assemblies. For the multiscale assembly, we focus on the methods of POMs assembly including templated synthesis and self- and co-assembly of POMs into nanoarchitectures and superstructures. For the applications, we review the applications of POM assemblies in energy, catalysis, and functional materials. Finally, we present the prospects for the future synthetic design and applications of POM assemblies.
{"title":"Multiscale assembly of polyoxometalates: From clusters to materials","authors":"Boyuan Yu , Xin Zhao , Jiangfeng Ni , Feng Yang","doi":"10.1016/j.chphma.2022.03.006","DOIUrl":"https://doi.org/10.1016/j.chphma.2022.03.006","url":null,"abstract":"<div><p>Polyoxometalates (POMs) have drawn broad and intense interest due to their unique structure-dependent properties. The assembly of POM molecules into nanoarchitectures and superstructures can bridge the gap between micro-molecule and bulk POM materials and integrate the merits of molecule and materials that are widely used in catalysis, energy conversion, electronics, and bioapplications. The synthetic methodologies and applications of multiscale POM assemblies have been widely studied. In this review, we survey the POM-based multiscale assembly focusing on two aspects: the strategies for multiscale assembly of POMs and the emerging applications of POM assemblies. For the multiscale assembly, we focus on the methods of POMs assembly including templated synthesis and self- and co-assembly of POMs into nanoarchitectures and superstructures. For the applications, we review the applications of POM assemblies in energy, catalysis, and functional materials. Finally, we present the prospects for the future synthetic design and applications of POM assemblies.</p></div>","PeriodicalId":100236,"journal":{"name":"ChemPhysMater","volume":"2 1","pages":"Pages 20-29"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50193417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1016/j.chphma.2022.03.002
Rui Shi , Haixia Hu , Tao Chen , Ruohua Gui , Jianqiang Liu , Xiaotao Hao , Hang Yin
The energetic disorder describes the energy state distribution in organic semiconducting materials. In organic solar cells (OSCs), energetic disorder is an important parameter for evaluating the charge transport behavior, and it is strongly correlated with the device performance. Thus far, a widely used approach for extracting energetic disorder values in OSCs is the Gaussian disorder model (GDM), in which the disorder values can be extracted by fitting the slope of , where is the charge mobility and is the temperature. Herein, we demonstrate the potential of the percolation approach to evaluate the energetic disorder values in OSCs and compare them with the data obtained using the GDM approach. Two typical non-fullerene acceptor (NFA)-based bulk heterojunction (BHJ) films, with PTB7-Th:ITIC and PM6:Y6, were selected as the model systems. When the percolation models were adopted in the two BHJ films, the energetic disorder values extracted from the Grünewald/Thomas and Nenashev percolation models gave similar results for electron transport in the PTB7-Th:ITIC and PM6:Y6 BHJ films. This work successfully demonstrates the feasibility of microresistance analysis in BHJ systems and the application potential of the percolation model for extracting energetic disorders in OSCs.
{"title":"Extracting energetic disorder in organic solar cells using percolation models","authors":"Rui Shi , Haixia Hu , Tao Chen , Ruohua Gui , Jianqiang Liu , Xiaotao Hao , Hang Yin","doi":"10.1016/j.chphma.2022.03.002","DOIUrl":"https://doi.org/10.1016/j.chphma.2022.03.002","url":null,"abstract":"<div><p>The energetic disorder <span><math><mi>σ</mi></math></span> describes the energy state distribution in organic semiconducting materials. In organic solar cells (OSCs), energetic disorder is an important parameter for evaluating the charge transport behavior, and it is strongly correlated with the device performance. Thus far, a widely used approach for extracting energetic disorder values in OSCs is the Gaussian disorder model (GDM), in which the disorder values can be extracted by fitting the slope of <span><math><mrow><mtext>ln</mtext><mi>μ</mi><mo>∼</mo><mfrac><mn>1</mn><msup><mi>T</mi><mn>2</mn></msup></mfrac></mrow></math></span>, where <span><math><mi>μ</mi></math></span> is the charge mobility and <span><math><mi>T</mi></math></span> is the temperature. Herein, we demonstrate the potential of the percolation approach to evaluate the energetic disorder values in OSCs and compare them with the data obtained using the GDM approach. Two typical non-fullerene acceptor (NFA)-based bulk heterojunction (BHJ) films, with PTB7-Th:ITIC and PM6:Y6, were selected as the model systems. When the percolation models were adopted in the two BHJ films, the energetic disorder values extracted from the Grünewald/Thomas and Nenashev percolation models gave similar results for electron transport in the PTB7-Th:ITIC and PM6:Y6 BHJ films. This work successfully demonstrates the feasibility of microresistance analysis in BHJ systems and the application potential of the percolation model for extracting energetic disorders in OSCs.</p></div>","PeriodicalId":100236,"journal":{"name":"ChemPhysMater","volume":"2 1","pages":"Pages 52-57"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50193373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-01DOI: 10.1016/j.chphma.2022.05.002
Ying Wang , Ning Han , Xinglong Li , Shengsheng Yu , Lingbao Xing
Photosynthesis is the basis for the survival of organisms in nature; consequently, the fabrication of artificial light-harvesting systems (LHSs) that simulate natural photosynthesis is of significant interest. Recently, a variety of artificial LHSs have been successfully constructed using fluorescence resonance energy transfer (FRET). However, it is crucial to fabricate artificial LHSs with a sequential energy transfer process when considering that the natural photosynthetic process involves a multistep sequential energy transfer process rather than a simple one-step energy transfer. Moreover, many previously reported LHSs have been used as imaging agents for cell labeling and bioimaging or as catalysts in photocatalytic reactions, showing promise for applications simulating natural photosynthesis. In this review, we have summarized recently published representative work on artificial LHSs. In addition, the application of LHSs in photocatalysis and cell labeling has been described in detail.
{"title":"Artificial light-harvesting systems and their applications in photocatalysis and cell labeling","authors":"Ying Wang , Ning Han , Xinglong Li , Shengsheng Yu , Lingbao Xing","doi":"10.1016/j.chphma.2022.05.002","DOIUrl":"10.1016/j.chphma.2022.05.002","url":null,"abstract":"<div><p>Photosynthesis is the basis for the survival of organisms in nature; consequently, the fabrication of artificial light-harvesting systems (LHSs) that simulate natural photosynthesis is of significant interest. Recently, a variety of artificial LHSs have been successfully constructed using fluorescence resonance energy transfer (FRET). However, it is crucial to fabricate artificial LHSs with a sequential energy transfer process when considering that the natural photosynthetic process involves a multistep sequential energy transfer process rather than a simple one-step energy transfer. Moreover, many previously reported LHSs have been used as imaging agents for cell labeling and bioimaging or as catalysts in photocatalytic reactions, showing promise for applications simulating natural photosynthesis. In this review, we have summarized recently published representative work on artificial LHSs. In addition, the application of LHSs in photocatalysis and cell labeling has been described in detail.</p></div>","PeriodicalId":100236,"journal":{"name":"ChemPhysMater","volume":"1 4","pages":"Pages 281-293"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772571522000316/pdfft?md5=35411ef78e45f3c14dfdf92f38e9014b&pid=1-s2.0-S2772571522000316-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77331886","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}
Developing highly conductive, stable, and active hydrogen evolution reaction (HER) catalysts is a critical step towards establishing the hydrogen economy. However, there are few catalysts, except for noble metals, that can meet all the requirements. Recently, two-dimensional (2D) transition metal carbon/nitride (MXene) materials have shown excellent performance in catalysis, and have attracted wide attention from researchers. In this study, the effectiveness of non-metal element (B, C, N, P, and S)-doped Ti3C2O2 MXene in the electrocatalytic hydrogen evolution reaction was investigated using density functional theory (DFT) calculations. Non-metal atoms as electron donors can provide additional electrons to the O functional group on the catalyst surface, thereby reducing charge transfer from H to O and the interaction between H and O. The Gibbs free energy (∆GH) of non-metal element-doped Ti3C2O2 is closer to 0 than that of pristine Ti3C2O2, demonstrating better hydrogen evolution performance. Furthermore, in the hydrogen evolution path, the desorption process is more inclined to the Heyrovsky mechanism, and doping greatly reduces the energy barrier of the reaction, thereby improving the catalytic efficiency. The present results prove that doping with non-metallic elements is an effective means of improving the catalytic activity of Ti3C2O2 for hydrogen evolution.
{"title":"Electrocatalytic hydrogen evolution performance of modified Ti3C2O2 doped with non-metal elements: A DFT study","authors":"Zhongxiao Wang, Haoxiang Di, Rui Sun, Yuting Zhu, Longwei Yin, Zhiwei Zhang, Chengxiang Wang","doi":"10.1016/j.chphma.2022.04.004","DOIUrl":"10.1016/j.chphma.2022.04.004","url":null,"abstract":"<div><p>Developing highly conductive, stable, and active hydrogen evolution reaction (HER) catalysts is a critical step towards establishing the hydrogen economy. However, there are few catalysts, except for noble metals, that can meet all the requirements. Recently, two-dimensional (2D) transition metal carbon/nitride (MXene) materials have shown excellent performance in catalysis, and have attracted wide attention from researchers. In this study, the effectiveness of non-metal element (B, C, N, P, and S)-doped Ti<sub>3</sub>C<sub>2</sub>O<sub>2</sub> MXene in the electrocatalytic hydrogen evolution reaction was investigated using density functional theory (DFT) calculations. Non-metal atoms as electron donors can provide additional electrons to the O functional group on the catalyst surface, thereby reducing charge transfer from H to O and the interaction between H and O. The Gibbs free energy (∆<em>G</em><sub>H</sub>) of non-metal element-doped Ti<sub>3</sub>C<sub>2</sub>O<sub>2</sub> is closer to 0 than that of pristine Ti<sub>3</sub>C<sub>2</sub>O<sub>2</sub>, demonstrating better hydrogen evolution performance. Furthermore, in the hydrogen evolution path, the desorption process is more inclined to the Heyrovsky mechanism, and doping greatly reduces the energy barrier of the reaction, thereby improving the catalytic efficiency. The present results prove that doping with non-metallic elements is an effective means of improving the catalytic activity of Ti<sub>3</sub>C<sub>2</sub>O<sub>2</sub> for hydrogen evolution.</p></div>","PeriodicalId":100236,"journal":{"name":"ChemPhysMater","volume":"1 4","pages":"Pages 321-329"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772571522000249/pdfft?md5=8bb431fb1e9f5d22d8297cb4a5517b9b&pid=1-s2.0-S2772571522000249-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76966603","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-doped Fe2O3 nanoparticles (M-FNPs) are successfully prepared first time by facile green-aided (almond gum) combustion route. The structural analysis of synthesized nanoparticles was well analyzed by Powder X-ray Diffraction (PXRD), Fourier Transform Infrared spectroscopy (FT-IR), Scanning Electron Microscope (SEM), Raman spectroscopy and UV-Visible spectral studies. PXRD showed a nanocrystalline nature and determined the average particle size to be 85 nm. The surface morphologies of the prepared nanocomposite was measured by SEM technique reveals the porous and spongy like structure. The photodegradation activity on 20 × 10−6 of Fast Orange Red (FOR) organic model dye using M-FNPs (50 mg) under UV light irradiation was investigatedin detail. Electrochemical examination of the prepared material was conducted using graphite–M-FNP electrode paste in 0.1 M KCl solution, and its performance in redox reaction was determined to be very good via cyclic voltammetry and electrochemical impedance spectroscopy. Further, an extension to sensor studies revealed broad differences in redox positions for paracetamol sensors, at 0.64 V and 0.41 V, confirming highly chemical sensor activity in alkaline medium for 1∼5 mM concentrations.
采用绿色辅助(杏仁胶)燃烧方法首次成功制备了mg掺杂Fe2O3纳米颗粒(M-FNPs)。采用粉末x射线衍射(PXRD)、傅里叶变换红外光谱(FT-IR)、扫描电镜(SEM)、拉曼光谱和紫外可见光谱对合成的纳米颗粒进行了结构分析。PXRD结果表明,该材料为纳米晶,平均粒径为85 nm。利用扫描电镜对制备的纳米复合材料表面形貌进行了检测,发现其具有多孔和海绵状结构。研究了M-FNPs (50 mg)对20 × 10−6的Fast Orange Red (FOR)有机模型染料的紫外降解活性。用石墨- M- fnp电极膏在0.1 M KCl溶液中对制备的材料进行了电化学检测,并通过循环伏安法和电化学阻抗谱法确定其在氧化还原反应中的性能良好。此外,对传感器研究的扩展揭示了扑热息痛传感器在0.64 V和0.41 V时氧化还原位置的广泛差异,证实了在1 ~ 5 mM浓度的碱性介质中具有高度化学传感器活性。
{"title":"Almond gum assisted synthesis of Mg doped Fe2O3 NPs: Structural analysis, electrochemical sensing, and optical applications","authors":"Madanakumara Hanumanthappa , Jayanna Halepoojar Siddalingappa , Yellamagad Channabasaveshwara , Soundeswaran Sundararajan , Mruthyunjaya Vishwas , Shyamala Kurki Srinivasaiah , Surendra Boppanahalli Siddegowda , Basavaraju Nandeesh","doi":"10.1016/j.chphma.2022.04.010","DOIUrl":"10.1016/j.chphma.2022.04.010","url":null,"abstract":"<div><p>Mg-doped Fe<sub>2</sub>O<sub>3</sub> nanoparticles (M-FNPs) are successfully prepared first time by facile green-aided (almond gum) combustion route. The structural analysis of synthesized nanoparticles was well analyzed by Powder X-ray Diffraction (PXRD), Fourier Transform Infrared spectroscopy (FT-IR), Scanning Electron Microscope (SEM), Raman spectroscopy and UV-Visible spectral studies. PXRD showed a nanocrystalline nature and determined the average particle size to be 85 nm. The surface morphologies of the prepared nanocomposite was measured by SEM technique reveals the porous and spongy like structure. The photodegradation activity on 20 × 10<sup>−6</sup> of Fast Orange Red (FOR) organic model dye using M-FNPs (50 mg) under UV light irradiation was investigatedin detail. Electrochemical examination of the prepared material was conducted using graphite–M-FNP electrode paste in 0.1 M KCl solution, and its performance in redox reaction was determined to be very good via cyclic voltammetry and electrochemical impedance spectroscopy. Further, an extension to sensor studies revealed broad differences in redox positions for paracetamol sensors, at 0.64 V and 0.41 V, confirming highly chemical sensor activity in alkaline medium for 1∼5 mM concentrations.</p></div>","PeriodicalId":100236,"journal":{"name":"ChemPhysMater","volume":"1 4","pages":"Pages 330-337"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772571522000328/pdfft?md5=3b2eceedf447dfb9d5b1b0c8a3bc46d9&pid=1-s2.0-S2772571522000328-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75751551","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}