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Machine learning-driven performance predictions in ammonia-fueled molten carbonate fuel cells: A comprehensive study on experimental data
IF 4.3 3区 材料科学
Diamond and Related Materials Pub Date : 2025-02-03 DOI: 10.1016/j.diamond.2025.112062
Andaç Batur Çolak
{"title":"Machine learning-driven performance predictions in ammonia-fueled molten carbonate fuel cells: A comprehensive study on experimental data","authors":"Andaç Batur Çolak","doi":"10.1016/j.diamond.2025.112062","DOIUrl":"10.1016/j.diamond.2025.112062","url":null,"abstract":"<div><div>Molten carbonate fuel cell is an emerging kind of fuel cell that has the potential to be used in both small-scale and large-scale energy distribution and generation systems. The objective of this study was to use machine learning techniques to forecast the electrochemical efficiency of molten carbonate fuel cells powered by ammonia fuel. Two artificial neural network models were created with the purpose of forecasting crucial electrochemical variables: current density and voltage. The models were trained using experimental data obtained from ammonia-fueled molten carbonate fuel cells. The first model used volume ratio, temperature, and flow rate to forecast current density, while the subsequent model employed volume ratio, temperature, and current density to predict voltage. Both models exhibited exceptional accuracy, as shown by the lowest departure of their mean squared error values from the experimental data. The models exhibited robust prediction accuracy, with variation rates as little as ±1.37 % for current density and ± 0.44 % for voltage. This study contributes to the field by combining machine learning techniques with experimental data from molten carbonate fuel cells, providing a new method for improving the performance of ammonia-fueled molten carbonate fuel cells.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"153 ","pages":"Article 112062"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143283763","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}
引用次数: 0
Waste silk fiber derived nitrogen doped reduced graphene oxide anchored nickel doped cobalt vanadate for supercapacitor applications
IF 4.3 3区 材料科学
Diamond and Related Materials Pub Date : 2025-02-03 DOI: 10.1016/j.diamond.2025.112065
S.K. Vinoth , H. Shanavaz , B.P. Prasanna , M.K. Prashanth , Fahd Alharethy , M.S. Raghu , Byong-Hun Jeon , K. Yogesh Kumar
{"title":"Waste silk fiber derived nitrogen doped reduced graphene oxide anchored nickel doped cobalt vanadate for supercapacitor applications","authors":"S.K. Vinoth ,&nbsp;H. Shanavaz ,&nbsp;B.P. Prasanna ,&nbsp;M.K. Prashanth ,&nbsp;Fahd Alharethy ,&nbsp;M.S. Raghu ,&nbsp;Byong-Hun Jeon ,&nbsp;K. Yogesh Kumar","doi":"10.1016/j.diamond.2025.112065","DOIUrl":"10.1016/j.diamond.2025.112065","url":null,"abstract":"<div><div>The present study uses Kibisu waste silk fiber as a carbon source to synthesize nitrogen-doped reduced graphene oxide (NRGO). NRGO is anchored with nickel-doped cobalt vanadate (Ni@Co<sub>3</sub>V<sub>2</sub>O<sub>8</sub>:Ni@CoV) and forms a stable Ni@CoV/NRGO nanocomposite. A simple solvothermal approach using deep eutectic solvents has been developed for the generation of Ni@CoV/NRGO nanocomposite. X-ray diffraction studies (XRD), Raman spectroscopic, microscopic, energy dispersive spectroscopic (EDS) and X-ray photoelectron spectroscopic (XPS) studies confirm the doping of Ni to CoV, nitrogen to the RGO matrix, and the formation of nanocomposite. Ni@CoV/NRGO showed a significant increase in the specific capacitance (Csp: 434 F g<sup>−1</sup>) compared to NRGO (275 F g<sup>−1</sup>) and Ni@CoV (59 F g<sup>−1</sup>) at a scan rate of 2 mV s<sup>−1</sup> using the cyclic voltammetry (CV) technique. Enhanced electrochemical performance in Ni@CoV/NRGO could be credited to the combination of faradaic (from Ni@CoV) and electrical double layer capacitance (NRGO) which exhibited pseudocapacitor behavior. In addition, variable oxidation states, and increased conductivity in Ni@CoV/NRGO are responsible for increased electrochemical performance. Even after 5000 cycles, Ni@CoV/NRGO showed good stability and retained 65 %. Asymmetric device (ASD) was fabricated using Ni@CoV/NRGO and activated carbon as the positive and negative electrodes, respectively. ASD showed a Csp of 146 F g<sup>−1</sup> at a 2 mV s<sup>−1</sup> scan rate. These findings point to Ni@CoV/NRGO as a suitable candidate for high-performance supercapacitors with a balanced energy density and power density.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"153 ","pages":"Article 112065"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156115","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}
引用次数: 0
Optimizing nitrogen-doped bamboo-derived hard carbon as anodes of sodium-ion batteries
IF 4.3 3区 材料科学
Diamond and Related Materials Pub Date : 2025-02-03 DOI: 10.1016/j.diamond.2025.112061
J.D. Wang , J. Kuai , J. Xie , T. Qiu , J. Wang , A.L. Li , F. Liu , J.P. Cheng
{"title":"Optimizing nitrogen-doped bamboo-derived hard carbon as anodes of sodium-ion batteries","authors":"J.D. Wang ,&nbsp;J. Kuai ,&nbsp;J. Xie ,&nbsp;T. Qiu ,&nbsp;J. Wang ,&nbsp;A.L. Li ,&nbsp;F. Liu ,&nbsp;J.P. Cheng","doi":"10.1016/j.diamond.2025.112061","DOIUrl":"10.1016/j.diamond.2025.112061","url":null,"abstract":"<div><div>Hard carbon made from bamboo has been considered as a promising anode material for sodium-ion batteries because of its renewability and high-performance. Nitrogen-doping can significantly improve the electrochemical performance of carbon materials through enhancing the conductivity and maintaining the stability. In this work, two series of N-doped hard carbon materials derived from bamboo were prepared by heating the mixture of hard carbon and melamine at different temperatures from 700 to 900 °C with various mass ratios of melamine to hard carbon 1:1, 2:1 and 3:1. The non-porous structure of the carbon particles made it difficult to achieve a high nitrogen content, and nitrogen would not be successfully doped into carbon at too high temperatures. Nitrogen doping into hard carbon would affect the structure and electrochemical properties. Among as-prepared samples, the one prepared with a mass ratio of 1:1 at 800 °C exhibited optimum performance with a high reversible specific capacity of 329.1 mAh·g<sup>−1</sup> and high initial Coulombic efficiency of 85.5 % at 30 mA·g<sup>−1</sup>. Moreover, it had excellent rate capability of 206.2 mAh·g<sup>−1</sup> at 1.5 A·g<sup>−1</sup>. After 100 cycles at 0.3 A·g<sup>−1</sup>, the capacity retention rate was 92.9 %. The results showed that the electrochemical performance of samples was strongly related to the doped nitrogen content, the disordered degree and the conductivity of N-doped hard carbon.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"153 ","pages":"Article 112061"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156116","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}
引用次数: 0
Influence of cell phenotype and surface modifications on the cytotoxicity of fluorescent nanodiamonds
IF 4.3 3区 材料科学
Diamond and Related Materials Pub Date : 2025-02-03 DOI: 10.1016/j.diamond.2025.112035
Yoon Seo Lee , Hyeon-Ji Jo , Nhuan T. Do , Nam Wong Song , Keir C. Neuman , Hak-Sung Jung , Jeong Hyun Shim , Se-Hwa Kim
{"title":"Influence of cell phenotype and surface modifications on the cytotoxicity of fluorescent nanodiamonds","authors":"Yoon Seo Lee ,&nbsp;Hyeon-Ji Jo ,&nbsp;Nhuan T. Do ,&nbsp;Nam Wong Song ,&nbsp;Keir C. Neuman ,&nbsp;Hak-Sung Jung ,&nbsp;Jeong Hyun Shim ,&nbsp;Se-Hwa Kim","doi":"10.1016/j.diamond.2025.112035","DOIUrl":"10.1016/j.diamond.2025.112035","url":null,"abstract":"<div><div>Fluorescent nanodiamonds (FNDs) have garnered considerable attention in biomedical fields owing to their unique physicochemical properties, including high photostability and biocompatibility. Nevertheless, concerns persist regarding their potential cytotoxicity both in pristine form and upon surface modification. In this study, we systematically investigated the cytotoxicity of FNDs regarding cell phenotype and surface modification. Two surface-modified FNDs were synthesized: mesoporous polydopamine encapsulated FNDs (FND@mPDA) and polyethylene glycol functionalized FND@mPDA (FND@mPDA-PEG). These types along with bare FNDs were applied to two cell phenotype groups, namely non-epithelial cells (A10 and HDFn) and epithelial cells (A549, HeLa, and HaCaT). All three types of FNDs exhibited substantial cytotoxicity in the non-epithelial cells, accompanied by elevated levels of reactive oxygen species. Moreover, precise 3D localization of red fluorescence allowed for quantitative estimations of the FND uptake levels in A549 and A10 cells. We observed that A10 cells internalized bare FNDs more effectively, while the surface modifications (FND@mPDA and FND@mPDA-PEG) further enhanced cellular uptake levels in A10 cells. Interestingly, a statistically significant linear correlation was observed between cell viability and uptake level in A10. Finally, we confirmed that all FND types were internalized via two pathways: clathrin-mediated endocytosis and macropinocytosis. These findings emphasize that the biocompatibility of FNDs crucially depends on cellular uptake, which is strongly affected by both cell phenotype and surface modification. This study provides valuable insights for exploring potential biomedical applications of surface-modified nanodiamonds.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"153 ","pages":"Article 112035"},"PeriodicalIF":4.3,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143283762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Theoretical exploration of fullerene-based X-Y@C80 (X = in, Sb, Te) nanomaterials as sensors for Thioguanine
IF 4.3 3区 材料科学
Diamond and Related Materials Pub Date : 2025-02-02 DOI: 10.1016/j.diamond.2025.112012
Idongesit J. Mbonu , Peter O. Ajala , Chinwe P. Okonkwo , Desire M. Kalu
{"title":"Theoretical exploration of fullerene-based X-Y@C80 (X = in, Sb, Te) nanomaterials as sensors for Thioguanine","authors":"Idongesit J. Mbonu ,&nbsp;Peter O. Ajala ,&nbsp;Chinwe P. Okonkwo ,&nbsp;Desire M. Kalu","doi":"10.1016/j.diamond.2025.112012","DOIUrl":"10.1016/j.diamond.2025.112012","url":null,"abstract":"<div><div>Nanomaterials have been widely investigated in recent research due to their unique properties specifically in drug adsorption and fullerenes are mostly explored in nano-cubes due to their biocompatibility. Therefore, this study centers on Thioguanine (TGN) adsorption on structurally modified fullerene C<sub>80</sub> material using Density Functional Theory (DFT) at the M06-2×/Gen/LanL2DZ/Def2svp computational method. Also, the sites of adsorption were put into consideration, so that the N- and S-sites on the TGN drug were used. Various analyses are maximized in determining the electronic characteristics of these systems. The HOMO-LUMO studies coupled with the determination of selected quantum descriptors such as the chemical hardness, reactivity, and electrophilicity index shed light on the transfer of electrons and the properties of the system before and after adsorption. Also, graphical plots for NCI describe a van da Waals and hydrogen relationship at the interaction point. Adsorption study suggests a chemisorption kind of adsorption and the quantum theory of atoms in molecules shows the transition of electrons majorly occurred within the anti-bonding natural orbital (pi type). A notable increase in the dipole moments is recorded including other sensing properties thereby highlighting the capability of these surfaces for adsorption. Generally, the result reveals these designed materials are prospective in the adsorption of the labeled drug contributing to a cleaner and safer environment.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"153 ","pages":"Article 112012"},"PeriodicalIF":4.3,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143283764","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}
引用次数: 0
Exploring the superhard potential of two diamond-like carbon allotropes
IF 4.3 3区 材料科学
Diamond and Related Materials Pub Date : 2025-02-02 DOI: 10.1016/j.diamond.2025.112064
Longhai Yan , Donghai Wu , Shuaiwei Wang
{"title":"Exploring the superhard potential of two diamond-like carbon allotropes","authors":"Longhai Yan ,&nbsp;Donghai Wu ,&nbsp;Shuaiwei Wang","doi":"10.1016/j.diamond.2025.112064","DOIUrl":"10.1016/j.diamond.2025.112064","url":null,"abstract":"<div><div>Two superhard carbon allotropes, <em>Pnma</em>-C20 and <em>P2</em><sub><em>1</em></sub><em>/m</em>-C10, have been identified through first-principles calculations. Both phases consist entirely of sp<sup>3</sup>-hybridized carbon bonds. Their structural stability was confirmed using elastic constants, phonon spectrum analysis, and <em>ab initio</em> molecular dynamics simulations. <em>Pnma</em>-C20 and <em>P2</em><sub><em>1</em></sub><em>/m</em>-C10 exhibit direct and indirect semiconductor characteristics, with band gaps of 4.19 eV and 3.68 eV, respectively. Their hardness values were calculated to be 82.1 GPa and 82.0 GPa, classifying them as superhard carbon materials. Analysis of their anisotropic mechanical properties revealed anisotropic behavior in Young's modulus, Poisson's ratio, and shear modulus, with anisotropy indicators comparable to those of diamond. Additionally, their anisotropic mechanical properties became more pronounced under increasing pressure. The X-ray diffraction (XRD) peak of Pnma-C20 aligns closely with the unknown XRD peak observed in experimental samples. These findings suggest that <em>Pnma</em>-C20 and <em>P2</em><sub><em>1</em></sub><em>/m</em>-C10 not only exhibit mechanical properties akin to diamond but also expand the family of carbon-based materials, providing a foundation for future analyses of related unknown structures.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"153 ","pages":"Article 112064"},"PeriodicalIF":4.3,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100500","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}
引用次数: 0
Nanoindentation of boron-doped diamond on (001) crystal plane by molecular dynamics simulations
IF 4.3 3区 材料科学
Diamond and Related Materials Pub Date : 2025-02-01 DOI: 10.1016/j.diamond.2024.111903
Xin Liu , Weiping Peng , Shengnan Shen , Zhenshen Deng
{"title":"Nanoindentation of boron-doped diamond on (001) crystal plane by molecular dynamics simulations","authors":"Xin Liu ,&nbsp;Weiping Peng ,&nbsp;Shengnan Shen ,&nbsp;Zhenshen Deng","doi":"10.1016/j.diamond.2024.111903","DOIUrl":"10.1016/j.diamond.2024.111903","url":null,"abstract":"<div><div>Boron-doped diamond is a crucial material for ultra-precision devices, with its mechanical properties and internal defect distribution being key factors that impact the efficiency and service life of such devices. This paper employs an innovative molecular dynamics method to analyze the nanoindentation process of boron-doped diamond with varying doping concentrations and crystal directions, offering valuable insights for the processing of boron-doped diamond. Firstly, a model of boron-doped diamond is built and nanoindentation simulations are conducted on the (001) crystal plane, with a comparative study for both 1 % boron-doped and pure diamond. Secondly, nanoindentation calculations and analyses are performed on the (001) crystal plane of diamonds doped with 0.1 %, 0.5 %, and 5 % boron to investigate the mechanical properties and dislocation evolution mechanisms across different boron-doping concentrations. Finally, the nanoindentation process of the (110) and (111) crystal planes of 1 % boron-doped diamond are calculated and analyzed to explore the crystal anisotropy in boron-doped diamond. The results show that boron-doped diamond exhibits higher Young's modulus, critical pressure, and stiffness compared to pure diamond. Furthermore, the equivalent von Mises stress on the stress concentration area and the quantity of dislocation during the nanoindentation loading process are reduced in boron-doped diamond compared to pure diamond. Meanwhile, the results demonstrate significant variations in the mechanical properties of diamond with different boron doping concentrations. The generation and diffusion mechanism of dislocations, as well as the type and quantity, do not exhibit consistency with increasing doping concentration. Moreover, our results suggest that (110) and (111) crystal surfaces have a lower critical pressure for inelastic deformation compared to (001) crystal surface, while their stiffness is higher. This study has the potential to advance the precision processing technology of boron-doped diamond.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"152 ","pages":"Article 111903"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159460","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}
引用次数: 0
Design and optimization of MXene based solar absorber for ultra-broadband solar energy absorption
IF 4.3 3区 材料科学
Diamond and Related Materials Pub Date : 2025-02-01 DOI: 10.1016/j.diamond.2025.111986
Riaz Ali , Wei Su , Muhammad Ali , Niaz Muhammad Khan
{"title":"Design and optimization of MXene based solar absorber for ultra-broadband solar energy absorption","authors":"Riaz Ali ,&nbsp;Wei Su ,&nbsp;Muhammad Ali ,&nbsp;Niaz Muhammad Khan","doi":"10.1016/j.diamond.2025.111986","DOIUrl":"10.1016/j.diamond.2025.111986","url":null,"abstract":"<div><div>An ultra-broadband solar absorber that is made up of MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) and resonators made of tungsten (W), which are refractory metals. The absorber is designed to attain ultra-broadband absorption properties. With an average absorptivity that exceeds 95 % over the solar spectrum (300–2500 nm), the absorber exhibits near-perfect absorption over a bandwidth of 2041.4 nm. Additionally, the structure exhibits an average absorptivity of 96.7 % under AM1.5. The behavior of the absorber is shown to be angle-independent and polarization-insensitive through simulations utilizing the Finite-Difference Time-Domain (FDTD) method, and the findings show that the absorber shows a good performance even at 60<sup>o</sup>. In order to have a better understanding of the mechanisms that are responsible for broadband absorption, the electric field distribution is examined. The proposed solar absorber could have the applications in solar energy conversion, photovoltaics and solar batteries.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"152 ","pages":"Article 111986"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160159","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}
引用次数: 0
Nitrogen doped three-dimensionally interconnected macroporous/mesoporous carbon nanofibers as free-standing electrode for room temperature sodium sulfur batteries
IF 4.3 3区 材料科学
Diamond and Related Materials Pub Date : 2025-02-01 DOI: 10.1016/j.diamond.2025.111997
Yiqiong Wang , Emayavaramban Indubala , Chao Ma , Cuijuan Zhang , Chun Li , Wenwen Zhang , Yaqi Chen , Yuju Zhao , Luming Xiao , Bo Lv , Shun Guo , Shanshan Yao
{"title":"Nitrogen doped three-dimensionally interconnected macroporous/mesoporous carbon nanofibers as free-standing electrode for room temperature sodium sulfur batteries","authors":"Yiqiong Wang ,&nbsp;Emayavaramban Indubala ,&nbsp;Chao Ma ,&nbsp;Cuijuan Zhang ,&nbsp;Chun Li ,&nbsp;Wenwen Zhang ,&nbsp;Yaqi Chen ,&nbsp;Yuju Zhao ,&nbsp;Luming Xiao ,&nbsp;Bo Lv ,&nbsp;Shun Guo ,&nbsp;Shanshan Yao","doi":"10.1016/j.diamond.2025.111997","DOIUrl":"10.1016/j.diamond.2025.111997","url":null,"abstract":"<div><div>High specific energy with low cost room temperature sodium‑sulfur (RT Na<img>S) batteries have attracted much attention in the field of energy storage devices. The poor conductivity of the active material sulfur and its discharge products, the slow kinetics of the sodium‑sulfur redox reaction, the “shuttle effect” of sodium polysulfide and volume expansion effect during charging and discharging are the key scientific problems limiting its development. In this paper, the authors constructed a nitrogen doped three-dimensionally (3D) interconnected macroporous/mesoporous carbon nanofibers by electrospinning via selective etching SiO<sub>2</sub> nanospheres template. The as-prepared 3D nitrogen-doped porous carbon nanofibers (N-PCNF) act as free standing sulfur hosts for RT Na<img>S batteries. The macroporous/mesoporous structure forms an interwoven carbon network that effectively improves the electronic conductivity and increases the accessibility of the electrolyte, thus facilitating rapid transfer of sodium ions and electrons. The mesoporous could prevent the shuttle phenomenon of sodium polysulfides. In addition, the heteroatom doped in the carbon matrix can not only improve the electrical conductivity but also anchor sulfur species to enhance the electrochemical performance. Consequently, the N-PCNF/S cathode exhibits an excellent initial capacity (866.9 mAh g<sup>−1</sup>) at 0.5C, outstanding cycling performance (656.7 mAh g<sup>−1</sup> after 300 cycles at 0.5C), and high rate performance (405 mAh g<sup>−1</sup> at 2C). This study paves the way for the design macro-mesoporous heteroatom doped carbon material for the construction outstanding functional free-standing membrane and shines the light on the effective and feasible way for the inhibition of shuttle effect in RT Na<img>S batteries.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"152 ","pages":"Article 111997"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160256","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}
引用次数: 0
700 V breakdown vertical diamond Schottky rectifier with power figure of merit 30.5 MW·cm−2
IF 4.3 3区 材料科学
Diamond and Related Materials Pub Date : 2025-02-01 DOI: 10.1016/j.diamond.2024.111887
Chao-Ching Chiang , Jian-Sian Li , Hsiao-Hsuan Wan , Fan Ren , Stephen J. Pearton
{"title":"700 V breakdown vertical diamond Schottky rectifier with power figure of merit 30.5 MW·cm−2","authors":"Chao-Ching Chiang ,&nbsp;Jian-Sian Li ,&nbsp;Hsiao-Hsuan Wan ,&nbsp;Fan Ren ,&nbsp;Stephen J. Pearton","doi":"10.1016/j.diamond.2024.111887","DOIUrl":"10.1016/j.diamond.2024.111887","url":null,"abstract":"<div><div>100 μm diameter Al-contact vertical Schottky rectifiers using a simple process without edge termination were fabricated on commercially available 5 μm thick p-type (net acceptor concentration 1.3 × 10<sup>16</sup> cm<sup>−3</sup>) single crystal diamond drift layers deposited by Chemical Vapor Deposition on 250 μm thick heavily B-doped (3 × 10<sup>20</sup> cm<sup>−3</sup>) single crystal templates (7 × 7 mm<sup>2</sup>). The maximum reverse breakdown was around 700 V, with an on-resistance of 16.6 mΩ.cm<sup>2</sup>, leading to a power figure-of-merit of 30.5 MW/cm<sup>2</sup>. The on-voltage was −3.0 to −3.7 V, measured from 15 rectifiers fabricated over the 7 × 7 mm<sup>2</sup> area, with a reverse recovery time of 7.6 ns. The on/off ratios when switching from −5 V forward to 100 V reverse were in the range of 10<sup>9</sup> to 10<sup>10</sup>. This vertical diamond rectifier is a promising technology for power switching applications.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"152 ","pages":"Article 111887"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160400","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}
引用次数: 0
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