Diamond and Related Materials最新文献

{"title":"Multiwalled carbon nanotube-cobalt vanadium oxide composite for high-performance supercapacitor electrodes with enhanced power density and cycling stability","authors":"","doi":"10.1016/j.diamond.2024.111557","DOIUrl":"10.1016/j.diamond.2024.111557","url":null,"abstract":"<div><p>Supercapacitors are becoming increasingly popular as energy storage devices due to their fast charging and discharging characteristics, high power densities, and extended operational lifespans. However, achieving high energy densities while maintaining excellent cycling stability remains a significant challenge. This study investigates the potential of cobalt vanadium oxide (Co₃V₂O₈ or CVO-U) doped with multiwalled carbon nanotubes (CNTs) as an advanced electrode material for high-performance supercapacitors. The CNT-U-CVO composite was synthesized via a hydrothermal method and comprehensively characterized using various techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), electron microscopy and electrical characterizations. The incorporation of CNTs into the CVO-U material resulted in significant enhancements in electrochemical performance. The CNT-U-CVO composite demonstrated an energy density of 8.49 Wh/kg (37 mWh/cm²) and an specific capacitance of 244 F/g (1076 mF/cm²), outperforming the pristine CVO material. The CNT-U-CVO composite exhibited optimal capacitance behavior, improved charge transfer kinetics, and accelerated ion transport, as demonstrated by cyclic voltammetry and galvanostatic charge-discharge experiments. These results were attributable to the CNTs' increased surface area and better electrical conductivity. A supercapacitor device with an asymmetric design was created using the CNT-U-CVO composite as the positive electrode and activated carbon as the negative electrode. This device exhibited outstanding performance, with an energy density of 6.93 Wh/kg (0.12 mWh/cm²), a power density of 320 W/kg (5.6 mWh/cm²), and remarkable cycling stability. It retained 72 % of its initial capacitance even after undergoing 6000 charge-discharge cycles. The results emphasize the promise of CNT-U-CVO materials as very attractive candidates for energy storage applications with superior performance, including enhanced energy density, power density, and cycling stability.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150034","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}

{"title":"Immobilization nitrogen-doped sodium alginate-derived carbon quantum dots on sodium alginate hydrogel for enhanced Pb(II) removal","authors":"","doi":"10.1016/j.diamond.2024.111576","DOIUrl":"10.1016/j.diamond.2024.111576","url":null,"abstract":"<div><p>Heavy metal contamination, particularly from Pb(II), poses severe environmental and health risks due to its toxicity and persistence in ecosystems. This study presents an innovative and sustainable adsorbent composed of nitrogen doped carbon quantum dots (NCDs), derived from sodium alginate and immobilized on a sodium alginate hydrogel (HL-NCDs), for the efficient extraction of Pb(II) from water. The experimental results indicate that Pb<img>N and Pb<img>C interactions, particularly involving the N<img>H moieties within the carbon quantum dots, are the predominant mechanisms facilitating Pb(II) removal, as confirmed by density functional theory (DFT) calculations. These interactions are substantiated by thermodynamic analyses and charge distribution studies, which highlight the enhanced affinity of HL-NCDs towards Pb(II) ions. The novel HL-NCDs composite material not only demonstrates excellent Pb(II) adsorption efficiency but also suggests broad applicability in water treatment technologies, marking a significant advancement in the use of biomass-derived materials for environmental remediation.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142164613","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}

{"title":"Multifunctional magnetic graphene/nano cellulose hybrid aerogel with excellent electromagnetic wave absorption and thermal insulating performances","authors":"","doi":"10.1016/j.diamond.2024.111573","DOIUrl":"10.1016/j.diamond.2024.111573","url":null,"abstract":"<div><p>Due to the increase in electromagnetic wave radiation pollution, there is a critical need for high-performance electromagnetic wave absorption (EWA) materials to mitigate electronic emissions from electronics and electro-mechanical devices. However, manufacturing EWA materials with strong attenuation capabilities and thermal characteristics remains a challenging problem, limiting their further application in daily life. This research demonstrates the rational fabrication of a novel magnetic reduced graphene oxide/cellulose nanofiber (M-rGO/CNF) hybrid aerogel with magneto-conduction networks for EWA applications. The M-rGO/CNF aerogel provided outstanding structural integrity, excellent magnetic permeability, and remarkable EWA capabilities induced by the synergistic impact of impedance matching features and magnetic loss capability. Our study provides a new approach to fabricating highly stable aerogels with excellent mechanical properties, thermal insulation properties, and EWA absorption performance.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150129","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}

{"title":"N,O-codoped microporous carbon derived from hypnum plumaeforme for high-rate supercapacitors","authors":"","doi":"10.1016/j.diamond.2024.111564","DOIUrl":"10.1016/j.diamond.2024.111564","url":null,"abstract":"<div><p>N,O-codoped microporous carbon (HPC) was derived from <em>hypnum plumaeforme</em> via precarbonization and KOH activation and utilized as an electrode for supercapacitors. The HPC750 sample, produced at an activation temperature of 750 °C, demonstrated superior capacitive behavior due to its large specific surface area, microporous architecture, and high number of oxygen and nitrogen heteroatoms. These HPC750 electrodes have a specific capacitance of up to 424 F g⁻¹ at a current density of 1 A g⁻¹ while also providing excellent rate performance, maintaining &gt;85 % capacitance over a range of 1 to 100 A g⁻¹. In a symmetric supercapacitor configuration using 6 M KOH and 1 M Na₂SO₄ as electrolytes, the HPC750 electrodes exhibit high specific capacitances of 96.2 F g⁻¹ and 65.8 F g⁻¹ at a current density of 1 A g⁻¹, respectively. With the Na₂SO₄ electrolyte, the device achieved a peak energy density of 29.9 W h kg⁻¹ and a peak power density of 225 W kg⁻¹. In addition, the electrodes retained approximately 90 % of their initial capacitance after 15,000 cycles at a current density of 5 A g⁻¹.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142164706","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}

{"title":"Mechanical performance of amorphous diamond-like carbon nanowires","authors":"","doi":"10.1016/j.diamond.2024.111546","DOIUrl":"10.1016/j.diamond.2024.111546","url":null,"abstract":"<div><p>Amorphous carbon nanowires (NW) are a fundamental piece in the study of novel nanoarchitectures with unexpected mechanical properties. However, the failure mechanism of amorphous carbon NW is still missing. In this study, classical molecular dynamics was employed to conduct stress-strain tests to address the mechanical response of amorphous carbons NW with different radii. This research characterizes the mechanical properties of aC NW with different sp³ contents, including Youngs modulus and ultimate tensile stress. Our study reveals that plastic deformation is mediated by chemical modifications in carbon bonding, leading to transitions from sp² to sp³ and vice versa. We observed that denser amorphous carbon materials undergo a transition from sp³ to sp² bonding prior to failure, facilitated by the recombination of sp² clusters. Additionally, plastic deformation in amorphous carbon NW is facilitated by the formation of shear transformation zones and nanovoids, with the deformation mechanism strongly dependent on the average coordination of carbon atoms. These insights provide valuable information for designing nanomaterials with tailored mechanical properties.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150136","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}

{"title":"Fe3C/Fe implanted hierarchical porous carbon as efficient electromagnetic wave absorber","authors":"","doi":"10.1016/j.diamond.2024.111556","DOIUrl":"10.1016/j.diamond.2024.111556","url":null,"abstract":"<div><p>The rapid development of communication technology has led to severe microwave pollution, which presents a challenge for microwave-absorbing composites. Current research suggests achieving superior microwave absorption requires the use of multi-component operation and ingenious structural design. Consequently, the present study has prepared continuous porous carbon (CPC) materials doped with large amounts of Fe₃C/Fe nanoparticles (Fe@CPC) using carbonization and acid etching. By balancing the advantages of the above strategies, it is possible to address issues such as poor impedance match, single loss capacity, easy oxidation of magnetic metals/alloys, and the limited absorption bandwidth of conventional absorbing materials at the same time. The material exhibits a minimum reflection loss of −23.2 dB with an efficient absorption range of 5.3 GHz at 1.9 mm at a filler content of just 10 wt% in the paraffin matrix. In this paper, the samples with a continuous porous structure were prepared by a simple method, and the properties were excellent due to the appropriate preparation method and the synergistic effect of the multi-component composite. The porous structure facilitates the presence of a considerable number of active sites, which enables the loading of a substantial quantity of metal ions. Furthermore, nanoparticles are capable of aggregating and dispersing on the surface. This paper presents a theoretical framework for understanding the synergistic effect of microwave radiation through interfacial polarization and micro-scale magnetic interaction. Nevertheless, there are still obstacles to overcome in terms of achieving precise control over the structural design and ensuring the compatible integration of metal components.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150135","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}

{"title":"Hydrothermal preparation of cotton-based rGO/N-doped porous carbon as electrode materials of supercapacitors","authors":"","doi":"10.1016/j.diamond.2024.111566","DOIUrl":"10.1016/j.diamond.2024.111566","url":null,"abstract":"<div><p>Porous carbon electrode materials are commonly used in supercapacitors due to their inexpensive raw materials, simple processing, and low pollution, aligning with the vision for green energy storage. Consequently, there is a current trend to discover porous carbon electrode materials with superior electrochemical properties. To enhance the pore volume ratio and electrochemical performance of porous carbon materials, this study proposes a hydrothermal method to pretreat the raw materials, facilitating the doping of nitrogen from urea. Moreover, graphene is introduced for its excellent conductivity, which can further improve the electrochemical properties of the material. We found a new one-step reduction Graphene Oxide (<em>rGO</em>)and the doping of nitrogen (N) elements were optimized by hydrothermal method, the wettability and pseudo-capacitance performance of the material are improved, and HTPC-700 shows a very excellent specific capacitance, its specific capacitance reaches 600 F g⁻¹ at a current density of 0.5 A g⁻¹, and it even reaches 260 F g⁻¹ at a current density of 1 A g⁻¹. Meanwhile the power density and energy density are respectively 74 W h kg⁻¹ and 280 W kg⁻¹. It also exhibits a remarkable capacitance retention rate of over 98.7 % after 5000 cycles at a current density of 1 A g⁻¹. Additionally, it demonstrates a rich ant nest-like pore structure and good specific surface area of 2427 m²/g, and a large pore volume of 1.09 cm³/g after carbonization and KOH activation. This study offers a novel doping method and provides a unique perspective for the development of porous carbon electrodes.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150123","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}

{"title":"Molten salt-confined construction of biocarbon 2D based on Megathyrsus Maximus biomass for high-performance symmetric supercapacitor","authors":"","doi":"10.1016/j.diamond.2024.111558","DOIUrl":"10.1016/j.diamond.2024.111558","url":null,"abstract":"<div><p>Exploring infinite resources, green strategy, and inexpensive for producing 2D biocarbon nanosheets is an essential method in renewable energy. This study aims to develop a eutectic salt-induced activation process for the production of porous carbon nanosheets with well-controlled microstructure using varying ZnCl₂ molarity levels. The results showed that biocarbon featuring thin nanosheets with 2D structure and a high specific surface area of 1294 m²g⁻¹ could be obtained in eutectic salt ZnCl₂ at 0.5 molarity with a specific capacitance reaching 495 Fg⁻¹. In addition, the capacitive properties of the cells decreased when the molarity was increased to 0.7 M, leading to a decline in specific capacitance to 171 Fg⁻¹. Based on these results, the new and low-cost strategy of eutectic salt media provided an effective method of converting guinea grass into highly valuable biocarbon in the field of electrochemical energy storage.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150134","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}

{"title":"One-step self-assembled biomass carbon aerogel/carbon nanotube/cellulose nanofiber composite for supercapacitor flexible electrode","authors":"","doi":"10.1016/j.diamond.2024.111530","DOIUrl":"10.1016/j.diamond.2024.111530","url":null,"abstract":"<div><p>Flexible and exceptionally lightweight energy storage devices are crucial for wearable electronic gadgets. Biomass materials are emerging as ideal flexible electrode components due to their biocompatibility and non-toxic nature. In this study, pineapple leaf fibers were utilized to create activated biomass carbon aerogel (Bio-CAA). Then, carbon nanotubes (CNTs) were integrated as conductive additives, combined with sturdy pineapple leaf cellulose nanofibers (CNFs) to establish a robust 3D framework. Utilizing a one-step self-assembly method, carbon aerogel/carbon nanotube/carbon nanofiber (Bio-CAA/CNT/CNF) flexible composite electrode materials were successfully synthesized. The porous structure of Bio-CAA effectively minimized the aggregation of CNTs, thereby significantly enhancing the electrochemical performance of the electrode material. The characterization indicated that the carbon aerogel composite exhibited a high specific surface area (684.275 m² g⁻¹) after tablet compression. The material was light yet robust, capable of being bent arbitrarily and recovering its original shape and withstanding 400 Kpa of pressure at an 88 % strain rate, demonstrating excellent mechanical properties. In a three-electrode system, the Bio-CAA/CNT/CNF = 19:1:1 based electrode exhibited a capacitance of 481 F g⁻¹ at a current density of 1 A g⁻¹. The CAA/CNT/CNF = 19:1:1 based solid symmetric supercapacitor (SSC) displayed excellent cycling stability, preserving 91.7 % capacitance after 10,000 cycles at a current density of 5 A g⁻¹. It achieved an energy density of 39.63 Wh kg⁻¹ at a power density of 500 W kg⁻¹. This biomass-derived carbon aerogel-based composite material demonstrates exceptional energy storage capabilities, and its lightweight attributes make it highly suitable for use in flexible displays, wearable devices, and related fields.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142150808","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}

{"title":"Development of carbon dots supported on Zr-MOFs nano-composites for effective oxygen evolution reaction","authors":"","doi":"10.1016/j.diamond.2024.111559","DOIUrl":"10.1016/j.diamond.2024.111559","url":null,"abstract":"<div><p>Efficient hydrogen generation from water splitting is a key component of the hydrogen economy. It has been extensively researched for decades how electrochemically splitting water using electrocatalysts might provide a sustainable and environmentally friendly hydrogen energy source. Sluggish kinetics of the oxygen evolution reaction (OER) hinders the process of overall water splitting. Although metal-organic frameworks (MOFs) are attractive for generation of effective OER electrocatalysts, their activity is significantly hindered by their inherent lower conductivity. Here, we demonstrate a Zr-MOF-based composite with carbon dots (CDs) in order to increase their OER activity. Its exceptional morphology with higher porosity and greater surface area results in enhanced electrochemical activity. It reveals tremendously low onset potential, i.e., 1.40 V vs. RHE, and a remarkably small overpotential of 1.45 V vs. RHE to attain benchmark current density. It exhibited a minimal Tafel value of 37 mV/dec, conquering state-of-the-art catalysts for OER. The fabricated electrocatalyst demonstrated a lower charge transfer resistance (R_ct) of 0.248 Ω, with exceptional durability for about 20 h in chronoamperometric studies and for up to 1500 CV cycles. All these results demonstrated that as-fabricated Zr-MOF-based composite is a probable and potential candidate for OER.</p></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142230139","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}