{"title":"Graphene quantum dots/persulfate boosted electro-oxidation for leachate degradation, carbon quantum dots extraction for anti-counterfeiting applications - a sustainable approach","authors":"R. Priyadarshini Rajesh, M.P. Saravanakumar","doi":"10.1016/j.diamond.2024.111693","DOIUrl":"10.1016/j.diamond.2024.111693","url":null,"abstract":"<div><div>Leachate management in an efficient way is still a challenge as it contains many emerging pollutants. This work activates the persulfate by defatted <em>Moringa oleifera</em> seeds waste-derived graphene quantum dots (M-GQDs) catalyst to degrade the matured leachate pollutants by electro-oxidation with scrap stainless steel as electrodes. At the optimized conditions with pH of 3, 4.5 V, 1 g/L of persulfate, 0.07 g/L of M-GQDs, 3 h of reaction time, the removal of UV<sub>254</sub>, chemical oxygen demand (COD), total organic carbon (TOC), and NH<sub>3</sub>-N is found to be 99 %, 97 %, 84 %, and 90 % respectively with less energy consumption of 0.44 kWh/kg COD. The 3D fluorescence excitation-emission spectrophotometer (3D EEM) and the Gas chromatography-mass spectroscopy (GC–MS) analysis results attune the degradation of dissolved organic matter and micropollutants in the leachate. From the above-mentioned electro-oxidation treatment generated sludge, the quantum dots (S-CQDs), have been synthesized and characterized. Both the M-GQDs and S-CQDs are green emissive, spherical, and hydrophilic, with an average particle size of 2 to 4 nm, a band gap of 4 eV, and a quantum yield of 3.91 %, & 6.73 % respectively. Both have shown good suitability for information encryption and anti-counterfeiting fingerprint enhancement without changing the latent shape. The work is innovative because it broadens the application of quantum dots to the purification of highly contaminated wastewater and the development of materials for industry from generated waste for a closed-loop sustainability system.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111693"},"PeriodicalIF":4.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572781","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}
Yi Lu , Wei Chen , Changrui Wang , Wei Tian , Jiawen He , Wenhe Liao
{"title":"Influence mechanism of magnetron sputtering process parameters on diamond surface preprocessing interface for chip heat sink","authors":"Yi Lu , Wei Chen , Changrui Wang , Wei Tian , Jiawen He , Wenhe Liao","doi":"10.1016/j.diamond.2024.111695","DOIUrl":"10.1016/j.diamond.2024.111695","url":null,"abstract":"<div><div>The interface between diamond and aluminum is poor in wettability and solid solubility. The interface bonding can be improved effectively by plating metal elements on diamond surface combined with heat treatment. In this paper, the influence of adjustable process parameters on the quality of Mo layer modified by magnetron sputtering was studied based on orthogonal experiments, and Mo-coated diamond/aluminum composite materials were prepared by Spark Plasma Sintering (SPS). The results indicate that the deposition of Mo layer on the diamond surface proceeds through three stages: adsorption, surface diffusion, and stable nucleus growth, forming an initial thin film, followed by layer-by-layer stacking through repeated growth of these stages. Sputtering time and sputtering pressure are the main factors affecting the quality of the coating. Mo layers prepared under conditions of 30 min and 0.5 Pa exhibit uniform and dense surface and moderate thickness. After heat treatment, recrystallization forms equiaxed grains, and Mo<sub>2</sub>C is formed in reaction with diamond, effectively enhancing the interface bonding strength between diamond and aluminum. The thermal conductivity of the diamond/aluminum composite material reached 342 W/(mK).</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111695"},"PeriodicalIF":4.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662985","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}
Meng Wu , Fei Wang , Xin Gao , Yuyao Li , Chengshuang Zhang , Yanling Bao , Yingbo Ruan , Mingjun Zhang , Zhongmin Su
{"title":"Influence of defocusing of UV pulse laser radiation on LIG synthesis on Polyetheretherketone","authors":"Meng Wu , Fei Wang , Xin Gao , Yuyao Li , Chengshuang Zhang , Yanling Bao , Yingbo Ruan , Mingjun Zhang , Zhongmin Su","doi":"10.1016/j.diamond.2024.111701","DOIUrl":"10.1016/j.diamond.2024.111701","url":null,"abstract":"<div><div>Laser-induced graphene (LIG) technology, a technique for preparing three-dimensional porous graphene by laser direct writing on carbon precursors under ambient condition, has been widely used due to its low cost and high efficiency. However, there is still a lack of research on the influence of the defocusing on LIG synthesis. In this paper, LIG is prepared by UV laser on Polyetheretherketone (PEEK) film, and a finite element simulation of this process is established to infer the temperature field. The influence of the defocusing on the structure, morphology, specific surface area <em>SSA</em>, and electrical properties of PEEK-LIG is investigated while maintaining the same energy radiated per unit area. The results show that the defocusing changes the structure and morphology of PEEK-LIG by affecting the temperature field distribution in both the surface and thickness directions, which affects the properties of LIG, where the surface area ratio <em>S</em><sub><em>dr</em></sub> does not depend on the defocusing amount monotonically. As the UV laser nears the beam waist at the threshold of LIG formation, <em>S</em><sub><em>dr</em></sub> has its maximum value and improves its electrical conductivity.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111701"},"PeriodicalIF":4.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561407","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":"Syntheses of stable and hydrophilic large-size halogenated graphene oxide-like materials for studying effects of halogenation on their electrochemical and optical properties","authors":"Yun-Ling Yang, Chao-Zhi Zhang","doi":"10.1016/j.diamond.2024.111717","DOIUrl":"10.1016/j.diamond.2024.111717","url":null,"abstract":"<div><div>Graphene derivatives has popularly applied in electron, laser, etc. Pulse laser devices need excellent graphene oxide derivatives, which should be easily made into stable films in air for fabricating high-performance laser devices. In this paper, stable and hydrophilic halogenated graphene oxide-like with hydroxyl groups (GOLH) materials were synthesized to study their electrochemical properties and application in solid pulse laser devices. Experimental results showed that the highest occupied molecular orbital energy level (<em>E</em><sub>HOMO</sub>) and the lowest unoccupied molecular orbital energy level (<em>E</em><sub>LUMO</sub>) values of three halogenated materials were 0.09–0.27 eV and 0.08–0.12 eV lower than those of GOLH, respectively. The mothed of Cl atoms replacing hydroxyl groups on the surfaces of GOLH can be applied in tuning the energy band gap (<em>E</em><sub>g</sub>) of graphene oxide derivatives. Halo elements partly substituting the hydroxyl groups on the surface of GOLH elongated insignificantly pulse duration of the signals of solid pulse lasers. Therefore, halo elements partly substituting the hydroxyl groups on the surface of GO derivatives would be a useful method of improving electrochemical stabilities of GO derivatives, tuning <em>E</em><sub>HOMO</sub>, <em>E</em><sub>LUMO</sub> and <em>E</em><sub>g</sub> of GO derivatives and preparing good optical materials for fabricating solid pulse lasers with stable signal intensity and narrow pulse duration.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111717"},"PeriodicalIF":4.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561320","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}
Chengjian Dai , Boxun Li , Lili Zeng , Qiang Wang , Zhiguo Chen , Yingxing Zeng , Xingjiao Zhang , Chaosheng Deng
{"title":"Graphene modulator and 2-bit encoder based on plasma induced transparency effect","authors":"Chengjian Dai , Boxun Li , Lili Zeng , Qiang Wang , Zhiguo Chen , Yingxing Zeng , Xingjiao Zhang , Chaosheng Deng","doi":"10.1016/j.diamond.2024.111715","DOIUrl":"10.1016/j.diamond.2024.111715","url":null,"abstract":"<div><div>Within this study, a periodic metasurface structure made up of two graphene strips, two fan-shaped graphene and a square ring graphene with notches is introduced to achieve plasma-induced transparency (PIT). The PIT effect is analyzed utilizing the Lorentz oscillatory coupling model, and it has been discovered that the theoretical values closely match the simulated values. The role of the Fermi level adjustments in graphene on the PIT effect was examined, and the PIT window was dynamically modified as the Fermi level changed, which was used to realize a 2-bit graphene encoder at 5.78 THz and 7.18 THz. The encoder boasts a greatest modulation depth of 80.9 % and exhibits a minimal insertion loss of 0.17 dB. By controlling the polarization direction of the incident photoelectric field, a high performance dual-channel switching modulator is successfully realized. Moreover, by increasing carrier mobility, the depth of modulation for the modulator at 11.22 THz is increased from 97.5 % to 99.5 %, and the insertion loss has dropped from 0.075 dB to 0.06 dB. In addition, the structure has superior sensing properties and slow light properties, featuring a sensitivity reaching up to 1.07 THz/RIU and a maximum group index of 293. The outcomes of our study contribute novel insights for the advancement of modulator, encoder, sensor technology and slow-light devices.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111715"},"PeriodicalIF":4.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538435","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}
Imran Hasan , Mohammad Al-Bahrani , Prakash Kanjariya , Anjan Kumar , R. Hannah Jessie Rani , Safaa Mohammed Ibrahim , Ashish Singh , Manbir Kaur
{"title":"Unveiling Bi-decorated graphitic carbon nitride nanostructures for electrochemical sensors","authors":"Imran Hasan , Mohammad Al-Bahrani , Prakash Kanjariya , Anjan Kumar , R. Hannah Jessie Rani , Safaa Mohammed Ibrahim , Ashish Singh , Manbir Kaur","doi":"10.1016/j.diamond.2024.111704","DOIUrl":"10.1016/j.diamond.2024.111704","url":null,"abstract":"<div><div>Developing sensitive and stable probes to monitor accurate quantification of anti-cancer drugs like nilutamide in human biofluids is critical for effective cancer monitoring and treatment. The current study aimed on synthesis bismuth-doped graphitic carbon nitride nanocomposite as an electrochemical probe for measuring nilutamide material. Graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) was prepared via a simple thermally induced copolymerization. Then, the g-C<sub>3</sub>N<sub>4</sub> layers were decorated with bismuth (Bi) to boost the quality of forming and interface between g-C<sub>3</sub>N<sub>4</sub> and Bi, therefore improving the electrochemical activity of the Bi-decorated g-C<sub>3</sub>N<sub>4</sub> system. The synthesized Bi-decorated g-C<sub>3</sub>N<sub>4</sub> material was studied by FESEM, XRD, TEM, EDX, FTIR, XPS, Raman, BET, UV–Vis and PL to confirm successful Bi incorporation of g-C<sub>3</sub>N<sub>4</sub> material. The investigations revealed that an excellent detection limit of 0.38 ppb (0.0012 nM) can be achieved using Bi-doped g-C<sub>3</sub>N<sub>4</sub> as an electrochemical sensor. A linear dynamic range of 5–160 ppb was observed for the sensing of nilutamide. Notably, the developed sensor showed good reproducibility with a relative standard deviation value of 3.78 %. In the future research, the potential of developed sensor developed to sensitively and selectively other molecules should be investigated in environmental samples. In addition, the Bi-decorated g-C<sub>3</sub>N<sub>4</sub>/GCE showed good sensitivity in a pH range to probe the nilutamide material.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111704"},"PeriodicalIF":4.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538340","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}
Dawei Fang , Yonghao Li , Yixiang Hu , Jince Zhang , Xiaochen Qi , Yukun Chen , Taiyu Jin , Jun Wang
{"title":"Green preparation of GQDs with small particle size, low defects, and high quantum yield by using hydrodynamic cavitation technology","authors":"Dawei Fang , Yonghao Li , Yixiang Hu , Jince Zhang , Xiaochen Qi , Yukun Chen , Taiyu Jin , Jun Wang","doi":"10.1016/j.diamond.2024.111700","DOIUrl":"10.1016/j.diamond.2024.111700","url":null,"abstract":"<div><div>In this work, the hydrodynamic cavitation (HC) method with simple operation, low cost, high safety and large-scale production was applied to prepare GQDs. The expandable graphite powder as the raw material was treated by utilizing a microwave oven and then continuously exfoliated in venturi HC device. Finally, the GQDs with the advantages of small particle size, uniform size distribution, low defects, good water solubility and high quantum yield can be obtained by simple filtration. The GQDs are prepared by using the HC method without the use of acids and the introduction of impurities in the entire preparation process. The effects of HC cycle time, inlet pressure and fluid temperature on the property of GQDs were investigated. The results showed that GQDs with particle size of 1.77 ± 0.03 nm, size distribution in the range of 1.25–2.25 nm and fluorescence quantum yield of 36.77 % were obtained at 14 h HC cycling time, 3.0 bar inlet pressure and 50 °C temperature. The obtained GQDs solution has the advantages of strong fluorescence, high concentration and good stability. According to the atomic force microscope (AFM) image analysis, it can be seen that the HC technique can be used to prepare single-layer GQDs. It is hoped that the present work can provide a possibility for the preparation of few-layer GQDs on a certain scale.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111700"},"PeriodicalIF":4.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142561403","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}
R. Sumethra , T. Jayakumari , N. Anuradha , K. Ravichandran , M. Varshini , M. Ayyanar , P.K. Praseetha
{"title":"Effect of nanocomposite partnering of g-C3N4 with Morinda pubescens leaf extract mediated Sr doped Ni/NiO on the photocatalytic dye detoxification: Confirmation by seed germination test","authors":"R. Sumethra , T. Jayakumari , N. Anuradha , K. Ravichandran , M. Varshini , M. Ayyanar , P.K. Praseetha","doi":"10.1016/j.diamond.2024.111716","DOIUrl":"10.1016/j.diamond.2024.111716","url":null,"abstract":"<div><div>A carbonaceous 2D material g-C<sub>3</sub>N<sub>4</sub> was added as the composite partner to Sr doped (Ni/NiO) to synthesize a green routed nanocomposite (Ni/NiO):Sr/g-C<sub>3</sub>N<sub>4</sub> using the leaf extract of <em>Morinda pubescens</em>. The synthesized material was employed as a photocatalyst towards complete detoxification of synthetic toxic dyes methylene blue (MB-cationic) and rose bengal (RB- anionic) widely used in textile, leather and paper industries. The efficiency of the nanocomposite was compared with those of Ni/NiO and Ni/NiO:Sr samples. The composite formation was verified through XRD, SEM, TEM, EDAX, FTIR, UV–Vis-NIR and XPS analyses. The Sr doped (Ni/NiO)/g-C<sub>3</sub>N<sub>4</sub> nanocomposite showed significant higher photocatalytic efficiency of 98 % for MB dye and 94 % for RB dye compared to (Ni/NiO):Sr (72 and 65 %) and (Ni/NiO) (83 % and 70 %) within 45 min of irradiation. The inclusion of g-C<sub>3</sub>N<sub>4</sub> in the nanocomposite reduces the band gap (from 3.9 eV for Ni/NiO to 2.9 eV for (Ni/NiO):Sr/g-C<sub>3</sub>N<sub>4</sub>), enabling it to serve as visible light responsive photocatalyst. The stability of the material was confirmed by conducting re-cycle test. To find the role of active species involved in the photocatalysis, trapping test was conducted, the result of which showed that OH<sup>⁎</sup> radicals predominate over the other three species (e<sup>−</sup>, h<sup>+</sup> and O<sub>2</sub><sup>−</sup>) in degrading the dye molecules. The attainment of complete detoxification of the test dye solutions was demonstrated by conducting seed germination test using <em>Amaranthus viridis</em> seeds. A superior seed germination was observed in the case of water sample treated by (Ni/NiO):Sr/g-C<sub>3</sub>N<sub>4</sub> nanocomposite compared to all the other samples including the control. Thus, this eco-friendly nanocomposite synthesized using <em>Morinda pubescens</em> plant leaf extract shows its potential for efficient detoxification of organic dyes through photocatalytic process.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111716"},"PeriodicalIF":4.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572783","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":"Enhanced interfacial properties of Ni-coated Ti3C2 MXene on Al-matrix composites: A first-principles investigation","authors":"Zhibin Liu , Ying Ling , Wenjie Hu , Hong Yan","doi":"10.1016/j.diamond.2024.111712","DOIUrl":"10.1016/j.diamond.2024.111712","url":null,"abstract":"<div><div>Ti<sub>3</sub>C<sub>2</sub> MXene may have a far-reaching prospect as a reinforcing phase for Al-matrix composites. Coating Ni on the Ti<sub>3</sub>C<sub>2</sub> surface is an important method to improve the wettability of the Al-Ti<sub>3</sub>C<sub>2</sub> interface and to enhance the bonding strength between Ti<sub>3</sub>C<sub>2</sub> and the Al matrix. In this paper, the interfacial relationships of Al/Ti<sub>3</sub>C<sub>2</sub> and Ni/Ti<sub>3</sub>C<sub>2</sub> interfaces are investigated by means of first-principles calculations, and the differences between Al(111) and Ni(111) and Ti<sub>3</sub>C<sub>2</sub>(001) are compared. Firstly, the Al(111)/Ti<sub>3</sub>C<sub>2</sub>(001) and Ni(111)/Ti<sub>3</sub>C<sub>2</sub>(001) interface structures are constructed by lattice mismatch theory. Then, the adhesion work and interface energy of the two interfacial structures are calculated. The results show that the adhesion work and interface energy of Al(111)/Ti<sub>3</sub>C<sub>2</sub>(001) are 2.5 J/m<sup>2</sup> and − 0.15 J/m<sup>2</sup>, respectively, and those of Ni(111)/Ti<sub>3</sub>C<sub>2</sub>(001) are 4.03 J/m<sup>2</sup> and 0.77 J/m<sup>2</sup>, respectively. Finally, the electronic properties of the Al(111)/Ti<sub>3</sub>C<sub>2</sub>(001) and Ni(111)/Ti<sub>3</sub>C<sub>2</sub>(001) interfaces are analyzed and discussed. The results indicate that the main bonding type of Al(111)/Ti<sub>3</sub>C<sub>2</sub>(001) is metallic bonding, while that of Ni(111)/Ti<sub>3</sub>C<sub>2</sub>(001) is ionic and metallic bonding. By analyzing the interfacial properties of Ti<sub>3</sub>C<sub>2</sub> MXene with Al after Ni coating on its surface from the perspective of theoretical calculations, this work provides theoretical support for analyzing the improvement of interfacial structure of Al-matrix composites by Ni-coated Ti<sub>3</sub>C<sub>2</sub>.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111712"},"PeriodicalIF":4.3,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553915","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}
Felix A. Kwarteng , Ahmed A.R. Abdel-Aty , Sayed R.E. Mohamed , Mohsen A. Hassan , Hidenori Ohashi , Nieves López-Salas , Wael M. Semida , Ahmed S.G. Khalil
{"title":"Novel onion flower-derived biochar for high-performance sustainable supercapacitor applications","authors":"Felix A. Kwarteng , Ahmed A.R. Abdel-Aty , Sayed R.E. Mohamed , Mohsen A. Hassan , Hidenori Ohashi , Nieves López-Salas , Wael M. Semida , Ahmed S.G. Khalil","doi":"10.1016/j.diamond.2024.111703","DOIUrl":"10.1016/j.diamond.2024.111703","url":null,"abstract":"<div><div>Onions, scientifically known as <em>Allium cepa</em> L., are commonly used as a vegetable and offer a variety of health benefits. However, this study explored a novel part of the onion plant, such as the flower seed cover often regarded as waste, by converting it into biochar (BC) via pyrolysis. Through careful optimization and activation with potassium hydroxide, the resulting novel biochar exhibited a unique graphitic nanosheet-like structure with an impressive surface area of 2538.31 m<sup>2</sup>/g. To serve as a control, rice straw, one of the most commonly used biomasses, was also activated using the same protocol. Various techniques, including XPS, HRTEM, SAED, FTIR, BET, XRD, and Raman, were used to comprehensively understand the surface and structural properties of the biochar. When the novel biochar was tested as an energy storage material, it exhibited a specific capacitance of 200.37 F/g at 1 A/g and 143.82 F/g at 5 A/g in a 1 M H<sub>2</sub>SO<sub>4</sub> electrolyte with a three-electrode system. In a two-electrode system, it showed 158 F/g at 1 A/g and 102 F/g at 5 A/g, indicating its effectiveness at high rates. The long-term cyclic stability analysis demonstrated 100 % capacity retention over 1000 cycles in the three-electrode system, and 90.77 % and 74.40 % retention after 5000 cycles and 10,000 cycles, respectively, in the two-electrode system. The fabricated symmetric supercapacitor yielded a power density of 500 W/kg and an energy density of 21.94 Wh/kg at a current density of 1 A/g. These findings provide valuable insights into the valorization of biomass in addressing concerns regarding the current energy storage dilemma.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"150 ","pages":"Article 111703"},"PeriodicalIF":4.3,"publicationDate":"2024-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142538436","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}