Pub Date : 2024-11-17DOI: 10.1016/j.diamond.2024.111782
Prabha G. Shetty, Aruna M. Sudapalli
The synthesis of g-C3N4, CuO, and g-C3N4/CuO/PAN composite was achieved through thermal decomposition, followed by comprehensive characterization. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and field-emission scanning electron microscopy (FESEM) were utilized to analyze structural and morphological details. The formation of 3D CuO nanoflowers occurred at a temperature of 500 °C.
Electrochemical experiments, including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge (GCD), were conducted on the g-C3N4, CuO, and g-C3N4/CuO/PAN composite. Incorporating g-C3N4, CuO, and PAN has significantly improved stability, lifespan, capacitance, and charge storage capabilities. The g-C3N4/CuO/PAN composite demonstrated superior electrochemical characteristics compared to g-C3N4 and CuO individually. Specifically, the g-C3N4/CuO/PAN composite exhibited a capacitance of 389 F/g at a current density of 1 A/g in 0.5 M H2SO4 with capacitance retention of 99.2 % stability (6000 cycles), outperforming CuO (100 F/g) and g-C3N4 (300 F/g). g-C3N4/CuO/PAN composite has the potential to revolutionize high-energy storage supercapacitors, inspiring a new wave of innovation in the field of energy storage.
{"title":"Electrochemical performance of 3D CuO nanoflowers and g-C3N4/CuO/PAN composite synthesized by thermal decomposition method","authors":"Prabha G. Shetty, Aruna M. Sudapalli","doi":"10.1016/j.diamond.2024.111782","DOIUrl":"10.1016/j.diamond.2024.111782","url":null,"abstract":"<div><div>The synthesis of g-C<sub>3</sub>N<sub>4</sub>, CuO, and g-C<sub>3</sub>N<sub>4</sub>/CuO/PAN composite was achieved through thermal decomposition, followed by comprehensive characterization. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and field-emission scanning electron microscopy (FESEM) were utilized to analyze structural and morphological details. The formation of 3D CuO nanoflowers occurred at a temperature of 500 °C.</div><div>Electrochemical experiments, including cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge (GCD), were conducted on the g-C<sub>3</sub>N<sub>4</sub>, CuO, and g-C<sub>3</sub>N<sub>4</sub>/CuO/PAN composite. Incorporating g-C<sub>3</sub>N<sub>4</sub>, CuO, and PAN has significantly improved stability, lifespan, capacitance, and charge storage capabilities. The g-C<sub>3</sub>N<sub>4</sub>/CuO/PAN composite demonstrated superior electrochemical characteristics compared to g-C<sub>3</sub>N<sub>4</sub> and CuO individually. Specifically, the g-C<sub>3</sub>N<sub>4</sub>/CuO/PAN composite exhibited a capacitance of 389 F/g at a current density of 1 A/g in 0.5 M H<sub>2</sub>SO<sub>4</sub> with capacitance retention of 99.2 % stability (6000 cycles), outperforming CuO (100 F/g) and g-C<sub>3</sub>N<sub>4</sub> (300 F/g). g-C<sub>3</sub>N<sub>4</sub>/CuO/PAN composite has the potential to revolutionize high-energy storage supercapacitors, inspiring a new wave of innovation in the field of energy storage.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"151 ","pages":"Article 111782"},"PeriodicalIF":4.3,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-16DOI: 10.1016/j.diamond.2024.111794
Milena Pijović Radovanović , Nikola Zdolšek , Snežana Brković , Marija Ječmenica Dučić , Dragana Vasić Anićijević , Ivona Janković Častvan , Vladimir Pavićević , Bojan Janković
In this work, Bearberry (Arctostaphylos uva-ursi L.) leaves and twigs were used as novel biomass source for production of biochar and modified biochars (manufacturing of microporous and mesoporous carbons by physical and chemical activations, using CO2 and H3PO4) via one-step carbonization (800 °C) with excellent physicochemical properties, for effective removal of Pb2+ and Cd2+ ions, and synthetic dye (Rhodamine B - RhB) from aqueous solutions. Results showed that carbonized (BL-C) and physically activated carbons (BL-CO2) as microporous adsorbents (specific surface areas 219.0 m2/g and 305.5 m2/g) show remarkable removal efficiency of Pb2+ (99.8 % and 99.9 %, for BL-C and BL-CO2), while these adsorbents showed moderate affinity for Cd2+ elimination (53.5 % and 48.5 %). BL-H3PO4 as mesoporous adsorbent with lower specific surface and larger pores (90.2 m2/g with Dmax = 33.6 nm), shows very good removal efficiency of PhB (~ 87 %). It was found that physical adsorption occurs during RhB removal onto BL-H3PO4, where dominant mechanism represents film diffusion, with reduced boundary layer effect. Adsorption process takes place over π–π, hydrogen bonding and electrostatic interactions. Adsorption processes of Pb2+ and Cd2+ onto BL-CO2 and BL-C take place via physical and chemical adsorption, but with different type of mechanism, including combination of diffusion and chemisorption (increased effect of boundary layer) and intra-particle diffusion (greatly reduced boundary layer effect), respectively. A very interesting fact found in this study, is that metal oxide surfaces (as Cu2O, SiO2, ZnO present in activated carbons) exhibit an efficient binding towards cadmium, providing physisorption capability onto non-metallic graphene features.
{"title":"Production and characterization of biochar and modified biochars by carbonization process of bearberry (Arctostaphylos uva-ursi. L.): Adsorption capacities and kinetic studies of Pb2+, Cd2+ and rhodamine B removal from aqueous solutions","authors":"Milena Pijović Radovanović , Nikola Zdolšek , Snežana Brković , Marija Ječmenica Dučić , Dragana Vasić Anićijević , Ivona Janković Častvan , Vladimir Pavićević , Bojan Janković","doi":"10.1016/j.diamond.2024.111794","DOIUrl":"10.1016/j.diamond.2024.111794","url":null,"abstract":"<div><div>In this work, Bearberry (<em>Arctostaphylos uva-ursi</em> L.) leaves and twigs were used as novel biomass source for production of biochar and modified biochars (manufacturing of microporous and mesoporous carbons by physical and chemical activations, using CO<sub>2</sub> and H<sub>3</sub>PO<sub>4</sub>) via one-step carbonization (800 °C) with excellent physicochemical properties, for effective removal of Pb<sup>2+</sup> and Cd<sup>2+</sup> ions, and synthetic dye (Rhodamine B - RhB) from aqueous solutions. Results showed that carbonized (BL-C) and physically activated carbons (BL-CO<sub>2</sub>) as microporous adsorbents (specific surface areas 219.0 m<sup>2</sup>/g and 305.5 m<sup>2</sup>/g) show remarkable removal efficiency of Pb<sup>2+</sup> (99.8 % and 99.9 %, for BL-C and BL-CO<sub>2</sub>), while these adsorbents showed moderate affinity for Cd<sup>2+</sup> elimination (53.5 % and 48.5 %). BL-H<sub>3</sub>PO<sub>4</sub> as mesoporous adsorbent with lower specific surface and larger pores (90.2 m<sup>2</sup>/g with <em>D</em><sub><em>max</em></sub> = 33.6 nm), shows very good removal efficiency of PhB (~ 87 %). It was found that physical adsorption occurs during RhB removal onto BL-H<sub>3</sub>PO<sub>4</sub>, where dominant mechanism represents film diffusion, with reduced boundary layer effect. Adsorption process takes place over π–π, hydrogen bonding and electrostatic interactions. Adsorption processes of Pb<sup>2+</sup> and Cd<sup>2+</sup> onto BL-CO<sub>2</sub> and BL-C take place via physical and chemical adsorption, but with different type of mechanism, including combination of diffusion and chemisorption (increased effect of boundary layer) and intra-particle diffusion (greatly reduced boundary layer effect), respectively. A very interesting fact found in this study, is that metal oxide surfaces (as Cu<sub>2</sub>O, SiO<sub>2</sub>, ZnO present in activated carbons) exhibit an efficient binding towards cadmium, providing physisorption capability onto non-metallic graphene features.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"151 ","pages":"Article 111794"},"PeriodicalIF":4.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-16DOI: 10.1016/j.diamond.2024.111785
Yu-jie Guo , Ding-shun She , Wen Yue , Jin-hua Wang , Hai-bo Liang , Ren Wang , Lei Cui
For purposes of investigating the high-temperature tribological behaviors of polycrystalline diamond (PCD) thrust bearings under simulated deep drilling conditions, tribological experiments have been conducted under various drilling fluid environments, including pure water-based, potassium-based, calcium-based, sodium-based, and mud drilling fluids. The linear reciprocating mode of CSM-TRN model tribo-tester has been used to reveal the lubrication mechanisms of these fluids at a working temperature of 125 °C. Experimental results demonstrate the PCD compacts tested under pure water-based drilling fluid environment show a higher friction coefficient and wear rate, compared with that tested under potassium-based, calcium-based, sodium-based and mud drilling fluids. The high coverage of the graphitization tribo-chemical films can hinder the oxidization and exfoliation of the PCD, which finally leads to the wear rates under potassium-based, calcium-based, sodium-based and mud drilling fluids are lower than that under pure water-based drilling fluid. Compared with that calcium-based, sodium-based and mud drilling fluids, the PCD compacts tested under potassium-based drilling fluid environment exhibit a low friction coefficient of 0.073 and a low wear rate of 3.15×10−2 mg/N·m resulting from the synergistic effect of low viscosity of drilling fluid, a smooth worn surface and the lubrication of graphitization tribo-chemical films.
{"title":"High-temperature tribological behaviors of polycrystalline diamond under water-based drilling fluid environments","authors":"Yu-jie Guo , Ding-shun She , Wen Yue , Jin-hua Wang , Hai-bo Liang , Ren Wang , Lei Cui","doi":"10.1016/j.diamond.2024.111785","DOIUrl":"10.1016/j.diamond.2024.111785","url":null,"abstract":"<div><div>For purposes of investigating the high-temperature tribological behaviors of polycrystalline diamond (PCD) thrust bearings under simulated deep drilling conditions, tribological experiments have been conducted under various drilling fluid environments, including pure water-based, potassium-based, calcium-based, sodium-based, and mud drilling fluids. The linear reciprocating mode of CSM-TRN model tribo-tester has been used to reveal the lubrication mechanisms of these fluids at a working temperature of 125 °C. Experimental results demonstrate the PCD compacts tested under pure water-based drilling fluid environment show a higher friction coefficient and wear rate, compared with that tested under potassium-based, calcium-based, sodium-based and mud drilling fluids. The high coverage of the graphitization tribo-chemical films can hinder the oxidization and exfoliation of the PCD, which finally leads to the wear rates under potassium-based, calcium-based, sodium-based and mud drilling fluids are lower than that under pure water-based drilling fluid. Compared with that calcium-based, sodium-based and mud drilling fluids, the PCD compacts tested under potassium-based drilling fluid environment exhibit a low friction coefficient of 0.073 and a low wear rate of 3.15×10<sup>−2</sup> mg/N·m resulting from the synergistic effect of low viscosity of drilling fluid, a smooth worn surface and the lubrication of graphitization tribo-chemical films.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"151 ","pages":"Article 111785"},"PeriodicalIF":4.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The excellent reinforcing capability of carbon nanofillers along with increasing demand for advanced polymer composites in automobiles, aircraft, and defense sectors motivate the research community to explore detailed mechanical, thermal, and electrical properties of carbon-based polymer nanocomposites for various applications. In this work, 0.1 to 7 parts per hundred ratios (phr) of multiwalled carbon nanotubes (MWCNTs) and unzipped MWCNTs (referred to as graphene oxide nanoribbons (GONRs)) were individually reinforced into polyamide-6 (PA6) matrix by twin-screw extrusion and standard sized specimens were prepared by the injection molding process. The interaction among PA6 and nanofillers were analyzed using Raman and FTIR spectroscopy. The oscillatory rheometry measurement at 0.1 rad/s angular frequency showed a 110.7 % rise in storage modulus and a 12.6 % rise in loss modulus for 0.1 phr GONRs reinforcements. Both the values raised by 100 % and 12.5 %, respectively for similar amounts of MWCNTs reinforcements. The thermo-gravimetric analysis (TGA) indicated the optimum thermal stability at 1 phr of GONRs content compared to the increasing stability with increasing MWCNTs content within PA6. The differential scanning calorimetry (DSC) curves indicated the optimum reinforcing capacity of GONRs at 0.5–3 phr reinforcements, as compared to those increasing for increasing MWCNTs content. An optimum reinforcing capacity at lower amounts of GONRs as compared to MWCNTs was confirmed from shifting trends of intensity peaks in Raman and FTIR spectra curves of the composites. It was attributed to high surface area and functional groups along the edges of GONRs. Altogether, the GONRs/PA6 composites possess excellent potential for applications in automotive and aerospace components, ballistics equipments, electronics, biomedicals, sensors, etc., requiring high mechanical and thermal stability.
{"title":"Viscoelastic and thermal properties of unzipped multiwalled carbon nanotubes reinforced polyamide-6 composites","authors":"Sangita Tripathy , Gaurav Singh Chauhan , Jeevan Jyoti , Sushant Sharma , Sanjay R. Dhakate , Bhanu Pratap Singh","doi":"10.1016/j.diamond.2024.111766","DOIUrl":"10.1016/j.diamond.2024.111766","url":null,"abstract":"<div><div>The excellent reinforcing capability of carbon nanofillers along with increasing demand for advanced polymer composites in automobiles, aircraft, and defense sectors motivate the research community to explore detailed mechanical, thermal, and electrical properties of carbon-based polymer nanocomposites for various applications. In this work, 0.1 to 7 parts per hundred ratios (phr) of multiwalled carbon nanotubes (MWCNTs) and unzipped MWCNTs (referred to as graphene oxide nanoribbons (GONRs)) were individually reinforced into polyamide-6 (PA6) matrix by twin-screw extrusion and standard sized specimens were prepared by the injection molding process. The interaction among PA6 and nanofillers were analyzed using Raman and FTIR spectroscopy. The oscillatory rheometry measurement at 0.1 rad/s angular frequency showed a 110.7 % rise in storage modulus and a 12.6 % rise in loss modulus for 0.1 phr GONRs reinforcements. Both the values raised by 100 % and 12.5 %, respectively for similar amounts of MWCNTs reinforcements. The thermo-gravimetric analysis (TGA) indicated the optimum thermal stability at 1 phr of GONRs content compared to the increasing stability with increasing MWCNTs content within PA6. The differential scanning calorimetry (DSC) curves indicated the optimum reinforcing capacity of GONRs at 0.5–3 phr reinforcements, as compared to those increasing for increasing MWCNTs content. An optimum reinforcing capacity at lower amounts of GONRs as compared to MWCNTs was confirmed from shifting trends of intensity peaks in Raman and FTIR spectra curves of the composites. It was attributed to high surface area and functional groups along the edges of GONRs. Altogether, the GONRs/PA6 composites possess excellent potential for applications in automotive and aerospace components, ballistics equipments, electronics, biomedicals, sensors, etc., requiring high mechanical and thermal stability.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"151 ","pages":"Article 111766"},"PeriodicalIF":4.3,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-15DOI: 10.1016/j.diamond.2024.111791
Luqiang Li , Hongqu Jiang , Yuan Luo , Haijun Wu , Qi Zhao , Xingxia Yang , Caiju Li , Jianhong Yi , Yichun Liu
Epoxy resin (EP) plays an important role in the field of friction, but its poor thermal conductivity limits its mature development in industry. To solve this problem, open cell copper foam (Cuf) and carboxylated carbon nanotubes (C-CNTs) were incorporated into the epoxy group as co-intensifiers to improve its thermal conductivity and frictional properties. The results demonstrate that increasing the pore density of Cuf/EP composite copper foam leads to a 33.6 % reduction in wear rate and 23.2 times increase in thermal conductivity when reaching 130 Pores Per Inch (PPI). Furthermore, increasing the content of C-CNTs in Cuf®(C-CNTs/EP) composites resulted in decreased friction coefficient and wear rate; at 0.75 wt% C-CNTs content, the friction coefficient decreased by 9.5 % and the wear rate decreased by 40.6 % compared to that of the (130PPICuf)/EP composites while also achieving a 54.8 % increase in thermal conductivity.
{"title":"A study of the friction and thermal properties of epoxy composites synergistically reinforced by open-celled Cu foams and carboxylated CNTs","authors":"Luqiang Li , Hongqu Jiang , Yuan Luo , Haijun Wu , Qi Zhao , Xingxia Yang , Caiju Li , Jianhong Yi , Yichun Liu","doi":"10.1016/j.diamond.2024.111791","DOIUrl":"10.1016/j.diamond.2024.111791","url":null,"abstract":"<div><div>Epoxy resin (EP) plays an important role in the field of friction, but its poor thermal conductivity limits its mature development in industry. To solve this problem, open cell copper foam (Cu<sub>f</sub>) and carboxylated carbon nanotubes (C-CNTs) were incorporated into the epoxy group as co-intensifiers to improve its thermal conductivity and frictional properties. The results demonstrate that increasing the pore density of Cu<sub>f</sub>/EP composite copper foam leads to a 33.6 % reduction in wear rate and 23.2 times increase in thermal conductivity when reaching 130 Pores Per Inch (PPI). Furthermore, increasing the content of C-CNTs in Cu<sub>f</sub>®(C-CNTs/EP) composites resulted in decreased friction coefficient and wear rate; at 0.75 wt% C-CNTs content, the friction coefficient decreased by 9.5 % and the wear rate decreased by 40.6 % compared to that of the (130PPICu<sub>f</sub>)/EP composites while also achieving a 54.8 % increase in thermal conductivity.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"151 ","pages":"Article 111791"},"PeriodicalIF":4.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
CO2-converted carbon nanotube (CNT) has been synthesized from industrial carbon dioxide emissions using a molten salt electrochemical process for an eco-friendly sustainable anode of sodium ion batteries (SIBs). The synthesized CNT have diameters ranging from 10 to 100 nm, and they combine with hard carbon (HC) to serve as SIB anode material. The synthesized CNT has the following roles: increasing the electrical conductivity of anode material, improving charge-discharge cycle stability, and enhancing sodium ion storage. We integrate these CNT into hard carbon by varying CNT contents, denoted as HC_xCNT(M), where x represents the weight of the CNT. So, the HC_5CNT(M) anode works better in half-cell SIBs, being able to handle different charging rates and reaching a maximum specific capacity of 256.7 mAh g−1 at a 0.2C-rate. This material also displayed remarkable stability, maintaining a specific capacity of 99.48 mAh g−1 at 1C-rate and the capacitive retention remained at 99.1 % after 800 cycles. The CO2-converted CNT can improve electrical conductivity, specific capacity, and cycle stability, according to electrochemical analysis results. This innovative approach not only contributes to sustainable energy storage but also provides a valuable solution for reducing carbon emissions and repurposing industrial waste.
利用熔盐电化学工艺，从工业二氧化碳排放中合成了二氧化碳转化碳纳米管（CNT），用于钠离子电池（SIB）的生态友好型可持续阳极。合成的 CNT 直径介于 10 纳米到 100 纳米之间，与硬碳（HC）结合后可用作 SIB 阳极材料。合成的碳纳米管具有以下作用：提高阳极材料的导电性、改善充放电循环稳定性和增强钠离子存储。我们通过改变碳纳米管的含量将这些碳纳米管融入硬碳中，用 HC_xCNT(M)表示，其中 x 代表碳纳米管的重量。因此，HC_5CNT(M) 阳极在半电池 SIB 中效果更好，能够处理不同的充电速率，并在 0.2C 速率下达到 256.7 mAh g-1 的最大比容量。这种材料还显示出卓越的稳定性，在 1C 速率下保持 99.48 mAh g-1 的比容量，在 800 次循环后电容保持率仍为 99.1%。根据电化学分析结果，二氧化碳转化的碳纳米管可以提高导电性、比容量和循环稳定性。这种创新方法不仅有助于实现可持续储能，还为减少碳排放和再利用工业废弃物提供了有价值的解决方案。
{"title":"CO2-converted carbon nanotubes produced from molten salt electrolytes process for application of eco-friendly sustainable anode for sodium ion batteries","authors":"Sukanya Pothaya , Chatwarin Poochai , Sarun Arunragsa , Phakin Chomyen , Anurat Wisitsoraat , Pimpa Limthongkul , Chakrit Sriprachuabwong","doi":"10.1016/j.diamond.2024.111790","DOIUrl":"10.1016/j.diamond.2024.111790","url":null,"abstract":"<div><div>CO<sub>2</sub>-converted carbon nanotube (CNT) has been synthesized from industrial carbon dioxide emissions using a molten salt electrochemical process for an eco-friendly sustainable anode of sodium ion batteries (SIBs). The synthesized CNT have diameters ranging from 10 to 100 nm, and they combine with hard carbon (HC) to serve as SIB anode material. The synthesized CNT has the following roles: increasing the electrical conductivity of anode material, improving charge-discharge cycle stability, and enhancing sodium ion storage. We integrate these CNT into hard carbon by varying CNT contents, denoted as HC_xCNT(M), where x represents the weight of the CNT. So, the HC_5CNT(M) anode works better in half-cell SIBs, being able to handle different charging rates and reaching a maximum specific capacity of 256.7 mAh g<sup>−1</sup> at a 0.2C-rate. This material also displayed remarkable stability, maintaining a specific capacity of 99.48 mAh g<sup>−1</sup> at 1C-rate and the capacitive retention remained at 99.1 % after 800 cycles. The CO<sub>2</sub>-converted CNT can improve electrical conductivity, specific capacity, and cycle stability, according to electrochemical analysis results. This innovative approach not only contributes to sustainable energy storage but also provides a valuable solution for reducing carbon emissions and repurposing industrial waste.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"151 ","pages":"Article 111790"},"PeriodicalIF":4.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-15DOI: 10.1016/j.diamond.2024.111789
Chencheng Liu , Tong Zhu , Jing Jia , Yi Zhu , Qingyun Chen , Wei Zhang , Wenlong Zhang , Hui Song , Yuezhong Wang , Nan Jiang
Herein, nitrogen doped polycrystalline diamond was prepared using the microwave plasma chemical vapor deposition (MPCVD) method with H2–CH4–N2 gas sources to achieve excellent electromagnetic (EM) wave absorption and thermal management properties. The effect of the nitrogen content (0 to 50 ppm) on its performance was studied. The 25-ppm nitrogen doped diamond demonstrated excellent EM wave absorption performance, achieving a minimum reflection loss (RLmin) of −44.8 dB at 6.7 GHz and a maximum effective absorption band (EAB) of 5.4 GHz (3.7–9.1 GHz). The superior absorption performance could be attributed to synergistic attenuation mechanisms including dipole and interface polarization, conduction loss, eddy current loss, and magnetic polarization, intensified by nitrogen vacancy centers. This multifunctional material, combining high thermal conductivity with effective low-frequency EM wave absorption, showed promise for applications in 5G communications and electronic devices.
{"title":"Facile synthesis of novel nitrogen-doped diamond with excellent microwave absorption and thermal conductive performance","authors":"Chencheng Liu , Tong Zhu , Jing Jia , Yi Zhu , Qingyun Chen , Wei Zhang , Wenlong Zhang , Hui Song , Yuezhong Wang , Nan Jiang","doi":"10.1016/j.diamond.2024.111789","DOIUrl":"10.1016/j.diamond.2024.111789","url":null,"abstract":"<div><div>Herein, nitrogen doped polycrystalline diamond was prepared using the microwave plasma chemical vapor deposition (MPCVD) method with H<sub>2</sub>–CH<sub>4</sub>–N<sub>2</sub> gas sources to achieve excellent electromagnetic (EM) wave absorption and thermal management properties. The effect of the nitrogen content (0 to 50 ppm) on its performance was studied. The 25-ppm nitrogen doped diamond demonstrated excellent EM wave absorption performance, achieving a minimum reflection loss (RL<sub>min</sub>) of −44.8 dB at 6.7 GHz and a maximum effective absorption band (EAB) of 5.4 GHz (3.7–9.1 GHz). The superior absorption performance could be attributed to synergistic attenuation mechanisms including dipole and interface polarization, conduction loss, eddy current loss, and magnetic polarization, intensified by nitrogen vacancy centers. This multifunctional material, combining high thermal conductivity with effective low-frequency EM wave absorption, showed promise for applications in 5G communications and electronic devices.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"151 ","pages":"Article 111789"},"PeriodicalIF":4.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-15DOI: 10.1016/j.diamond.2024.111743
N. Jafarulla , Shanmugaiah Mathan Kumar
To improve advanced energy storage systems, innovative and versatile electrode materials with exceptional electrochemical characteristics must be developed. In this study, we present a new and distinctive design for an electrode made of MWCNT nanowires decorated on plates like MnMoO4. The nanocomposite was fabricated using a hydrothermal method and developed for use in an asymmetric supercapacitor. Initially, the samples underwent thorough examination using spectroscopic techniques such as XRD and XPS, as well as microscopic investigation using FE-SEM. The sample provides an effective mesoporous structure, facilitates the flow of ions, enables fast electron transfer, and permits a higher concentration of MnMoO4 and MWCNT active sites. The MnMoO4/MWCNT composite has a specific capacitance (Cs) of 1800 F/g at 1 A g−1, demonstrating excellent durability in a three-electrode cell. The built asymmetric supercapacitors demonstrate a power density of 1062 W kg−1 and an energy density of 42.48 Wh kg−1. Furthermore, the ASCs exhibit remarkable cycling stability, with about 93% capacity retention after undergoing 10,000 cycles. Therefore, the current work clearly shows its effective due to its excellent electrochemical properties, this material shows great potential to be used in storage systems for energy.
{"title":"Electrochemical performance of MnMoO4-decorated MWCNT nanocomposite plates for asymmetric capacitor applications","authors":"N. Jafarulla , Shanmugaiah Mathan Kumar","doi":"10.1016/j.diamond.2024.111743","DOIUrl":"10.1016/j.diamond.2024.111743","url":null,"abstract":"<div><div>To improve advanced energy storage systems, innovative and versatile electrode materials with exceptional electrochemical characteristics must be developed. In this study, we present a new and distinctive design for an electrode made of MWCNT nanowires decorated on plates like MnMoO<sub>4</sub>. The nanocomposite was fabricated using a hydrothermal method and developed for use in an asymmetric supercapacitor. Initially, the samples underwent thorough examination using spectroscopic techniques such as XRD and XPS, as well as microscopic investigation using FE-SEM. The sample provides an effective mesoporous structure, facilitates the flow of ions, enables fast electron transfer, and permits a higher concentration of MnMoO<sub>4</sub> and MWCNT active sites. The MnMoO<sub>4</sub>/MWCNT composite has a specific capacitance (C<sub>s</sub>) of 1800 F/g at 1 A g<sup>−1</sup>, demonstrating excellent durability in a three-electrode cell. The built asymmetric supercapacitors demonstrate a power density of 1062 W kg<sup>−1</sup> and an energy density of 42.48 Wh kg<sup>−1</sup>. Furthermore, the ASCs exhibit remarkable cycling stability, with about 93% capacity retention after undergoing 10,000 cycles. Therefore, the current work clearly shows its effective due to its excellent electrochemical properties, this material shows great potential to be used in storage systems for energy.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"151 ","pages":"Article 111743"},"PeriodicalIF":4.3,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-14DOI: 10.1016/j.diamond.2024.111783
Yurong Liu , Huijie Wu , Heng Wang , Jinbiao Wang
With the increasingly serious electromagnetic radiation and pollution, high-performance microwave absorption materials are urgently needed. In this work, the hollow Fe3O4/single-walled carbon nanohorns (SWCNHs) composites have been synthesized through one-step solvothermal method. The compositions, morphologies, microstructures, and microwave absorption performance of the hollow Fe3O4/SWCNHs composite have been comprehensively investigated. Benefitting from the unique hollow spherical structure and synergistic effects of dielectric loss and magnetic loss, the as-obtained hollow Fe3O4/SWCNHs composite exhibits an optimum reflection loss of −46.9 dB at 16.8 GHz with a matching thickness of 1.5 mm, and a broad effective absorption bandwidth of 7.21 GHz ranging from 10.79 to 18 GHz with a thickness of 2.0 mm, suggesting that the hollow Fe3O4/SWCNHs composite can be used for high-efficiency microwave absorption.
{"title":"One-step solvothermal synthesis of hollow Fe3O4/single walled carbon nanohorns composites with excellent microwave absorption properties","authors":"Yurong Liu , Huijie Wu , Heng Wang , Jinbiao Wang","doi":"10.1016/j.diamond.2024.111783","DOIUrl":"10.1016/j.diamond.2024.111783","url":null,"abstract":"<div><div>With the increasingly serious electromagnetic radiation and pollution, high-performance microwave absorption materials are urgently needed. In this work, the hollow Fe<sub>3</sub>O<sub>4</sub>/single-walled carbon nanohorns (SWCNHs) composites have been synthesized through one-step solvothermal method. The compositions, morphologies, microstructures, and microwave absorption performance of the hollow Fe<sub>3</sub>O<sub>4</sub>/SWCNHs composite have been comprehensively investigated. Benefitting from the unique hollow spherical structure and synergistic effects of dielectric loss and magnetic loss, the as-obtained hollow Fe<sub>3</sub>O<sub>4</sub>/SWCNHs composite exhibits an optimum reflection loss of −46.9 dB at 16.8 GHz with a matching thickness of 1.5 mm, and a broad effective absorption bandwidth of 7.21 GHz ranging from 10.79 to 18 GHz with a thickness of 2.0 mm, suggesting that the hollow Fe<sub>3</sub>O<sub>4</sub>/SWCNHs composite can be used for high-efficiency microwave absorption.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"151 ","pages":"Article 111783"},"PeriodicalIF":4.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-14DOI: 10.1016/j.diamond.2024.111787
Hoda EL-Nagar , M.S. Abd El-sadek , Mohamed Khairy , E.M.M. Ibrahim , S. Hampel , Sahar Elnobi
In this work, titanium oxide nanoparticles (TiO2 NPs) and TiO2-Multi walled carbon nanotubes (MWCNTs) nanocomposites were prepared using the ball milling technique. The characterization of synthesized nanocomposite was done using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS), Raman spectroscopy, and transmission electron microscopy (TEM). Dielectric constant ε1 (ω) and dielectric loss ε2 (ω) were discussed in terms of the dielectric polarization process. The Ac conductivity was increased with increasing MWCNTs amount. The charge carrier transport mechanism was interpreted using the correlated barrier hopping model (CBH). The Impedance spectroscopy showed a non-Debye relaxation in the material. The specific capacitance was increased with increasing MWCNTs concentration. Based on these detailed results, the TiO2-MWCNTs nanocomposites displayed higher specific capacitance than TiO2. In addition, the control of the current density applied onto CV measurements and MWCNTs composition of the electrodes to enhance the capacitance will open up a new strategy for the high-performance supercapacitors.
{"title":"Preparation and characterization of ball milled titanium oxide/multi walled carbon nanotube nanocomposite for supercapacitor applications","authors":"Hoda EL-Nagar , M.S. Abd El-sadek , Mohamed Khairy , E.M.M. Ibrahim , S. Hampel , Sahar Elnobi","doi":"10.1016/j.diamond.2024.111787","DOIUrl":"10.1016/j.diamond.2024.111787","url":null,"abstract":"<div><div>In this work, titanium oxide nanoparticles (TiO<sub>2</sub> NPs) and TiO<sub>2</sub>-Multi walled carbon nanotubes (MWCNTs) nanocomposites were prepared using the ball milling technique. The characterization of synthesized nanocomposite was done using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS), Raman spectroscopy, and transmission electron microscopy (TEM). Dielectric constant ε<sub>1</sub> (ω) and dielectric loss ε<sub>2</sub> (ω) were discussed in terms of the dielectric polarization process. The Ac conductivity was increased with increasing MWCNTs amount. The charge carrier transport mechanism was interpreted using the correlated barrier hopping model (CBH). The Impedance spectroscopy showed a non-Debye relaxation in the material. The specific capacitance was increased with increasing MWCNTs concentration. Based on these detailed results, the TiO<sub>2</sub>-MWCNTs nanocomposites displayed higher specific capacitance than TiO<sub>2</sub>. In addition, the control of the current density applied onto CV measurements and MWCNTs composition of the electrodes to enhance the capacitance will open up a new strategy for the high-performance supercapacitors.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"151 ","pages":"Article 111787"},"PeriodicalIF":4.3,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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