Carbon Trends最新文献_第7页

Novel bowl-like or capped carbon with a low carbon footprint as electrode material in EDLCs 将低碳足迹的新型碗状或封盖碳作为 EDLC 的电极材料

Carbon Trends Pub Date : 2024-04-23 DOI: 10.1016/j.cartre.2024.100357

Satvik Anshu , Rahul R , Surbhi Priya , Alok Kumar Srivastava , Amreesh Chandra

{"title":"Novel bowl-like or capped carbon with a low carbon footprint as electrode material in EDLCs","authors":"Satvik Anshu , Rahul R , Surbhi Priya , Alok Kumar Srivastava , Amreesh Chandra","doi":"10.1016/j.cartre.2024.100357","DOIUrl":"10.1016/j.cartre.2024.100357","url":null,"abstract":"<div><p>Large surface area, excellent electrical conductivity, homogeneous structure, and extended cycling stability are desirable characteristics for energy materials. Carbon-derived structures exhibit porous structure, work well in a wide potential window, and are highly conductive. Hence, they can show enhanced rate capability and cycle life. Despite ongoing efforts, the synthesis of carbons at lower temperatures remains a challenge. In comparison, the high-temperature synthesis protocols lead to a high CO<sub>2</sub> footprint. Here, we report the synthesis of unique carbon morphologies, namely capped carbon nanostructures (CCS) and bowl-like carbon structures (BCS). Their performances are either comparable or higher than those conventionally used morphologies of carbon, such as nanospheres, microspheres, nanotubes, graphene oxide, and layered structures. The four-sided opening in BCS particles ensures higher adsorption of electrolyte ions, which is even higher than hierarchical or spherical structures. The cap formation on the CCS acts like an additional layer on top of the sphere. Further, the CCS is arranged in a sequential honeycomb array, which leads to the formation of definitive channels for electrolyte diffusion. The unique carbon morphologies showed nearly ∼ 40 % increment in the specific capacitance values compared to other commonly used carbon structures. The novel morphologies also have a much lower carbon footprint, as shown by the life cycle assessment (LCA) studies.</p></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667056924000385/pdfft?md5=0a3d52b71675b75ab1ee0bf896b05704&pid=1-s2.0-S2667056924000385-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140759293","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}

引用次数: 0

Ultrasonic synthesis of borophene as a 2D electrode material with high electrocatalytic activity for use in fuel cell applications 超声波合成具有高电催化活性的二维电极材料硼吩以用于燃料电池应用

Carbon Trends Pub Date : 2024-04-20 DOI: 10.1016/j.cartre.2024.100356

Ramazan Bayat , Neslihan Esra Celik , Merve Akin , Muhammed Bekmezci , Ebru Halvaci , Tugba Simsek , Güray Kaya , Fatih Sen

{"title":"Ultrasonic synthesis of borophene as a 2D electrode material with high electrocatalytic activity for use in fuel cell applications","authors":"Ramazan Bayat , Neslihan Esra Celik , Merve Akin , Muhammed Bekmezci , Ebru Halvaci , Tugba Simsek , Güray Kaya , Fatih Sen","doi":"10.1016/j.cartre.2024.100356","DOIUrl":"10.1016/j.cartre.2024.100356","url":null,"abstract":"<div><p>Green energy systems must be able to provide a significant proportion of the energy needed to meet the ever-increasing demand for energy. Fuel cells are a promising solution to bridge the gap in the green energy transition. This study aims to enhance the energy efficiency of fuel cells by utilizing 2D supported nanocatalysts in the anode compartment. Borophene was synthesized using the liquid phase exfoliation method to be used as a support structure due to its superior properties. To use borophene as a supporting material in methanol fuel cells, a borophene-palladium hybrid structure (Pd@Borophene) was prepared using the chemical reduction method. The scanning electron microscopy (SEM) images showed that the obtained particle had a partially formed layered structure. The electrocatalytic activity of the Pd@Borophene was investigated through anodic reactions in Direct Methanol Alcohol Fuel Cells (DMFC). Electrochemical analyses were conducted to compare the effect of borophene on Pd and Pd@borophene nanocatalysts on the anodic reaction. The anodic peak current value of methanol oxidation for Pd@borophene was found to be 24.3 mA/cm<sup>2</sup>, which is approximately four times higher than that of unsupported Pd nanoparticles. Additionally, the ratio of forward current (If) to reverse current (Ib), which serves as an indicator of catalyst poisoning, was determined to be 2.27. This study contributes significant findings to the literature by demonstrating that borophene, an advanced 2D material, can be synthesized using a low-cost liquid phase exfoliation method and can be utilized in fuel cell applications for energy generation.</p></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667056924000373/pdfft?md5=a2a820c82ac12532075ea3de47d37562&pid=1-s2.0-S2667056924000373-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140775098","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}

引用次数: 0

Inhomogeneities across boron-doped nanocrystalline diamond films 掺硼纳米晶金刚石薄膜的不均匀性

Carbon Trends Pub Date : 2024-04-17 DOI: 10.1016/j.cartre.2024.100353

J.J. Bennett , S. Mandal , D.J. Morgan , A. Papageorgiou , O.A. Williams , G.M. Klemencic

{"title":"Inhomogeneities across boron-doped nanocrystalline diamond films","authors":"J.J. Bennett , S. Mandal , D.J. Morgan , A. Papageorgiou , O.A. Williams , G.M. Klemencic","doi":"10.1016/j.cartre.2024.100353","DOIUrl":"https://doi.org/10.1016/j.cartre.2024.100353","url":null,"abstract":"<div><p>For large-scale device fabrication, information about film inhomogeneities is crucial for high fabrication yield. In this work, inhomogeneities in two-inch diameter heavily boron-doped nanocrystalline diamond (BNCD) films have been studied. Two BNCD films were grown using chemical vapour deposition (CVD) with different boron-to-carbon (B/C) ratios. Their superconducting properties were measured as a function of distance from the centre of the film. The critical temperature (<span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) and critical magnetic field (<span><math><msub><mrow><mi>H</mi></mrow><mrow><mi>c</mi><mn>2</mn></mrow></msub></math></span>) decreased radially outwards from the centre for both films. Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and scanning electron microscopy (SEM) were done on the samples to pinpoint the underlying explanation for the observed behaviour. Raman spectroscopy suggested a reduction in boron concentration and diamond purity over both films while moving radially outwards from the centre. XPS data from both films, however, did not show similar behaviours to that observed from the Raman data for the B/C ratios or diamond content. The AFM scans and SEM analysis showed a decreasing grain size further away from the film centre irrespective of the B/C ratio. This is due to the film being thinner at the edges when compared with the centre of the film. Raman analysis showed that the film with the higher B/C ratio had a higher diamond purity across the film. As expected, the film with a higher B/C ratio showed a more robust superconducting behaviour. The observed reductions in boron concentration, diamond purity, film thickness and decreased grain sizes are responsible for the diminishing superconductivity at the edge of the films.</p></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667056924000348/pdfft?md5=23d528cf32fda93f6f520d84c70b0da5&pid=1-s2.0-S2667056924000348-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140639037","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}

引用次数: 0

Mapping carbon nanotube aspect ratio, concentration and spinning in FCCVD synthesis controlled by sulphur 绘制受硫控制的 FCCVD 合成过程中的碳纳米管长宽比、浓度和纺丝图

Carbon Trends Pub Date : 2024-04-12 DOI: 10.1016/j.cartre.2024.100355

Miguel Vazquez-Pufleau , Raul Fernandez Torres , Luis Arevalo , Nabil Abomailek , Juan J. Vilatela

{"title":"Mapping carbon nanotube aspect ratio, concentration and spinning in FCCVD synthesis controlled by sulphur","authors":"Miguel Vazquez-Pufleau , Raul Fernandez Torres , Luis Arevalo , Nabil Abomailek , Juan J. Vilatela","doi":"10.1016/j.cartre.2024.100355","DOIUrl":"https://doi.org/10.1016/j.cartre.2024.100355","url":null,"abstract":"<div><p>Floating catalyst chemical vapor deposition (FCCVD) enables ultrafast synthesis of CNTs and other 1D nanoparticles and their direct assembly as macroscopic solids. The chalcogen growth promotor in FCCVD produces high aspect ratio CNTs that can aggregate in the gas phase and form an aerogel which can be continuously spun as macroscopic fibres or sheets. We study the role of sulphur in controlling CNT morphology and aggregation by synthesising CNTs under a wide range of S/C ratios (0.001 to 5 wt.%) and determining their diameter and length distributions, number concentration and form of aggregation. Increasing S/C ratio in this range increases mean number of CNT walls from 1 to 8, decreases mean length from 34 to 6 µm, but CNT number concentration remains approximately constant at 8 × 10<sup>8</sup>#/cm<sup>3</sup>. Assuming growth within the first 3 cm of the reactor, longitudinal growth rate spans 1.5- 6.5 µm/s for the different CNT morphologies, but with similar mass throughput of 700 attogram/catalyst. This indicates the amount of carbon reaching the catalyst and solidifying as CNT remains constant regardless of the sulphur available in the catalyst, suggesting the rate limiting process is not at the catalyst/promoter interface but instead in the transport of carbonaceous active precursors to the catalyst, either due to their diffusion in the gas phase or decomposition kinetics. The CNTs produced range from polymer-like, which readily bundle and form aerogels, to rod-like that do not. We include aerogelation “phase diagrams” for different CNT concentrations, aspect ratios and CNT bending stiffness.</p></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667056924000361/pdfft?md5=112ca4ff600992b3430094b73a8d4c5e&pid=1-s2.0-S2667056924000361-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140643804","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}

引用次数: 0

Electrochemical synthesis of nitrogen-doped graphene quantum dots and their photocatalytic hydrogen evolution application 氮掺杂石墨烯量子点的电化学合成及其光催化氢进化应用

Carbon Trends Pub Date : 2024-04-10 DOI: 10.1016/j.cartre.2024.100354

Ari Gurel , Frédéric Avignon , Guillaume Wang , Stéphanie Lau , Jean-Yves Piquemal , Christian Perruchot , Delphine Schaming

{"title":"Electrochemical synthesis of nitrogen-doped graphene quantum dots and their photocatalytic hydrogen evolution application","authors":"Ari Gurel , Frédéric Avignon , Guillaume Wang , Stéphanie Lau , Jean-Yves Piquemal , Christian Perruchot , Delphine Schaming","doi":"10.1016/j.cartre.2024.100354","DOIUrl":"10.1016/j.cartre.2024.100354","url":null,"abstract":"<div><p>A very simple electrochemical top-down procedure was employed to obtain pure graphene quantum dots (GQDs) in water and using only graphite as carbonaceous precursor. The graphitic structure of the GQDs has been clearly observed by high-resolution transmission electronic microscopy (HRTEM). Then, the synthesis of N-doped GQDs was allowed by the addition of ammonia in the solution. The nitrogen doping was plainly evidenced by X-ray photoelectron (XPS) and Raman spectroscopies. The role of the electrolytic solution employed during the synthesis has been also discussed. Finally, these N-doped and non-doped GQDs were further used to prepare hybrids by grafting them onto ZnO semi-conductors, and their photocatalytic properties towards water-splitting were investigated. Interestingly, a very important enhancement of the amount of dihydrogen produced was observed with N-doped GQDs, compared to ZnO alone or to hybrids prepared with non-doped GQDs.</p></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266705692400035X/pdfft?md5=cc99a46c9037eff8698c2409f91d7e24&pid=1-s2.0-S266705692400035X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140790606","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}

引用次数: 0

Carbon nanoparticle-induced cell death 碳纳米粒子诱导的细胞死亡

Carbon Trends Pub Date : 2024-04-04 DOI: 10.1016/j.cartre.2024.100352

Sandugash Myrzagali , Zhuldyz Omarova , Didar Zeitkaziyeva , Aruzhan Madet , Yingqiu Xie

引用次数: 0

Dimetallic praseodymium-cobalt carbon nanotubes as highly efficient electrocatalyst for oxygen reduction reaction 二金属镨钴碳纳米管作为氧气还原反应的高效电催化剂

Carbon Trends Pub Date : 2024-04-04 DOI: 10.1016/j.cartre.2024.100350

Huazhong Liang, Yu Dong, Qin Ding, Xiaoyu Li, Miao Yu, Peihe Li, Limei Duan, Yin Wang

{"title":"Dimetallic praseodymium-cobalt carbon nanotubes as highly efficient electrocatalyst for oxygen reduction reaction","authors":"Huazhong Liang, Yu Dong, Qin Ding, Xiaoyu Li, Miao Yu, Peihe Li, Limei Duan, Yin Wang","doi":"10.1016/j.cartre.2024.100350","DOIUrl":"https://doi.org/10.1016/j.cartre.2024.100350","url":null,"abstract":"<div><p>In this study, six bimetallic rare earth (RE = La, Ce, Pr, Nd, Sm, Eu) cobalt nitrogen doped carbon nanotubes (RECo-NCNTs) were synthesized with g-C<sub>3</sub>N<sub>4</sub> derivative method. These RECo-NCNTs were characterized by SEM, BET, XPS, XRD and Raman. In addition, their catalytic performances for oxygen reduction reaction (ORR) had also been tested. The introduction of rare earths did not destroy the structure of nanotubes but apparently change their ORR performances. The PrCo-NCNTs showed the significant improvement in catalytic ability for ORR (onset potential of 0.95 V and half-wave potential of 0.79 V), which is very close to that of commercial 20 % Pt/C. Moreover, PrCo-NCNTs exhibits an excellent catalytic stability (no activity decay after 10000st cycles) and an outstanding methanol toxic tolerance. Assembled in metal–air batteries (Zn-air, Al-air and Mg-air), the PrCo-NCNTs electrode also presents high power densities and discharge voltages.</p></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667056924000312/pdfft?md5=bb2476d76f4456808521b8273b2bae4e&pid=1-s2.0-S2667056924000312-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140543468","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}

引用次数: 0

Rapid synthesis of CVD graphene with controllable charge carrier mobility 快速合成具有可控电荷载流子迁移率的 CVD 石墨烯

Carbon Trends Pub Date : 2024-04-03 DOI: 10.1016/j.cartre.2024.100349

Maxim G. Rybin , Evgeniy A. Guberna , Ekaterina A. Obraztsova , Ivan Kondrashov , Irina I. Kurkina , Svetlana A. Smagulova , Elena D. Obraztsova

{"title":"Rapid synthesis of CVD graphene with controllable charge carrier mobility","authors":"Maxim G. Rybin , Evgeniy A. Guberna , Ekaterina A. Obraztsova , Ivan Kondrashov , Irina I. Kurkina , Svetlana A. Smagulova , Elena D. Obraztsova","doi":"10.1016/j.cartre.2024.100349","DOIUrl":"https://doi.org/10.1016/j.cartre.2024.100349","url":null,"abstract":"<div><p>A high mobility of charge carriers and a low sheet resistance in graphene are the key indicators of its quality and applicability in electronic devices. In turn, the mobility of charge carriers in graphene is determined by graphene film smoothness. The electron scattering on structure defects of graphene film (wrinkles and grain boundaries) strongly affects the charge carrier mobility. In this work a simple and ultrafast approach for synthesis of graphene monolayer with the controllable smoothness and wrinkle density onto a resistively heated copper foil is presented. The method is a cold-wall chemical vapor deposition from methane. The fast synthesis of graphene with a full process cycle of 3 min is demonstrated. The structural defect density of polycrystalline graphene is optimized by appropriate combinations of methane concentration in the chamber and duration of synthesis process. Under the lower concentration of methane with the longer synthesis time the lower defect density in graphene appeared. The increase of process time from 30 s up to 10 min (under the decrease of methane concentration from 4.5 % to 0.36 %, respectively) leads to increase of average distance between wrinkles in graphene film from 6 µm to 35 µm. А charge carrier mobility as high as 2170 cm<sup>2</sup>V<sup>−1</sup>s<sup>−1</sup> and a sheet resistance as low as 318 Ohm/□ under the lowest wrinkle density are measured for graphene polycrystalline monolayer deposited onto SiO<sub>2</sub> substrate.</p></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667056924000300/pdfft?md5=3bab922691b826d94064a31a70159e7e&pid=1-s2.0-S2667056924000300-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140543467","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}

引用次数: 0

Synthesis and transformation of graphene-like structures from bamboo waste for photoelectrochemical devices 利用竹废料合成和转化类石墨烯结构，用于光电化学器件

Carbon Trends Pub Date : 2024-04-03 DOI: 10.1016/j.cartre.2024.100351

Febi Indah Fajarwati , Rahmat Hidayat , Ganjar Fadillah

{"title":"Synthesis and transformation of graphene-like structures from bamboo waste for photoelectrochemical devices","authors":"Febi Indah Fajarwati , Rahmat Hidayat , Ganjar Fadillah","doi":"10.1016/j.cartre.2024.100351","DOIUrl":"https://doi.org/10.1016/j.cartre.2024.100351","url":null,"abstract":"<div><p>This study presents a sustainable and versatile approach to synthesize graphene-like structures from bamboo waste for application in photoelectrochemical (PEC) devices. Due to its high cellulose content, bamboo, a locally available and renewable resource, is a perfect precursor for producing graphene-like materials. The synthesis process involves bamboo waste pyrolysis, followed by treatments with different solvents: ultrapure water (UPW), NaOH, and green tea extract. Characterization techniques confirmed the successful transformation of bamboo waste into carbon-rich, graphene-like materials with varying surface properties. The electrochemical characterization showed that the graphene-like materials could transfer electrons very well with a high current response compared to charcoal as a precursor. PEC evaluations revealed their potential as photoanodes, exhibiting efficient light absorption and charge carrier separation. This research emphasizes the significance of bamboo waste as a valuable precursor for eco-friendly graphene-like materials, offering a sustainable pathway for developing efficient PEC devices and green energy technologies.</p></div>","PeriodicalId":52629,"journal":{"name":"Carbon Trends","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2667056924000324/pdfft?md5=becce2b3559b50cc2584ec1ebcabb1e7&pid=1-s2.0-S2667056924000324-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140543466","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}

引用次数: 0

Synthesis and dynamics of PtSi nanoparticles on a carbon nanofilm by in-situ TEM Joule heating 通过原位 TEM 焦耳加热在碳纳米薄膜上合成 PtSi 纳米粒子及其动力学特性

Carbon Trends Pub Date : 2024-03-28 DOI: 10.1016/j.cartre.2024.100348

Simon Hettler , Raul Arenal

引用次数: 0