Article
Biochemistry & Molecular Biology
Michael Salverda, Antony Raj Thiruppathi, Farnood Pakravan, Peter C. Wood, Aicheng Chen
Summary: A new automated electrochemical process for the production of graphene oxide (GO) from graphite has been reported. The morphology, structure, and composition of the electrochemically exfoliated GO (EGO) were analyzed and compared with GO prepared using the traditional chemical method. The automated electrochemical process was found to be effective, and the electrochemical properties of EGO, CGO, and other carbon-based materials were further investigated and compared. The automated electrochemical exfoliation of natural graphite powder is a facile, cost-effective, and easy-to-scale-up method for the large-scale production of graphene-based nanomaterials.
Article
Chemistry, Physical
Ruitao Jin, Filip Vukovic, Tiffany R. Walsh
Summary: This study investigates the key steps of graphene exfoliation and recombination in aqueous media through molecular simulations. The results show that peptide P1 can increase the energy barrier for graphene exfoliation, but also raise the barrier for sheet recombination, contributing to stable graphene dispersion in water.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
C. Justin Raj, Ramu Manikandan, Pugalenthiyar Thondaiman, Periyasamy Sivakumar, A. Dennyson Savariraj, Won-Je Cho, Byung Chul Kim, Hyun Jung
Summary: Graphene synthesized via electrochemical exfoliation of graphite is a simple, fast, and scalable technique suitable for supercapacitor electrodes. Pulse sonication assisted electrochemical exfoliation significantly enhances the process, with the nature of electrolyte and intercalation ions playing a crucial role in the quality and performance of graphene. The presence of various defect sites on the surface and edges of graphene exfoliated in acidic and neutral electrolytes contributes to improved electrochemical performance.
Article
Biochemistry & Molecular Biology
Lidia Magerusan, Florina Pogacean, Stela Pruneanu
Summary: Due to the safety concerns associated with acetaminophen, a quick and environmentally friendly method using direct voltage application in saltwater has been developed to synthesize nitrogen-doped graphene (exf-NGr). The exf-NGr-modified electrode shows excellent performance in acetaminophen detection and quantification, with good reproducibility and stability, as well as wide detection range capabilities.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Multidisciplinary Sciences
Piotr Kamedulski, Malgorzata Skorupska, Pawel Binkowski, Weronika Arendarska, Anna Ilnicka, Jerzy P. Lukaszewicz
Summary: The manuscript discusses the influence of external pressure on graphene exfoliation and 3D structuring, showing improved surface area and ORR activity. Results suggest that the outstanding ORR activity of 3D structured graphene materials is not solely due to catalytic centers, emphasizing the importance of structural factors.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
T. M. W. J. Bandara, T. M. A. A. B. Thennakoon, G. G. D. M. G. Gamachchi, L. R. A. K. Bandara, B. M. K. Pemasiri, U. Dahanayake
Summary: This study focuses on a low-cost and nonoxidative approach to exfoliating vein graphite into graphene. The combination of electrochemical exfoliation and ultrasonic vibration with inexpensive black tea solution as a substitute for toxic solvents proves to be successful in producing high-quality graphene. The study reveals the potential for large-scale production of graphene using this method.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Wei Zhao, Abhilash Sugunan, Thomas Gillgren, Johan A. Larsson, Zhi-Bin Zhang, Shi-Li Zhang, Jens Sommertune, Illia Dobryden, Anwar Ahniyaz
Summary: This study demonstrates a single coating formulation for multifunctional composites in the packaging industry, providing a gas barrier against both oxygen and water vapor. The starch-graphene composite films made from a surfactant-free starch nanoparticle-stabilized graphene dispersion showed a decrease in oxygen and water vapor permeability by over 70% under various humidity conditions, while also being foldable and electrically conductive. This surfactant-free approach of incorporating graphene into an industrially important biopolymer offers a cost-effective and water-based solution for deposition of multifunctional composite films for a range of applications, such as gas barriers in food packaging.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Review
Energy & Fuels
N. S. Mankge, M. J. Madito, N. W. Hlongwa, A. T. Kuvarega
Summary: This review focuses on the recent progress in efficient methods for graphene synthesis, particularly electrochemical exfoliation of graphite, for mass production of doped electrochemically exfoliated graphene (EEG) in energy storage applications. The method allows for easy tuning of the nature of EEG, and the quality of graphene produced using different electrolytes and setup parameters is comprehensively reviewed.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Physical
Alexander A. Nikiforov, Mikhail S. Kondratenko, Olesya O. Kapitanova, Marat O. Gallyamov
Summary: A novel top-down approach to graphene synthesis combining electrochemical ion intercalation and supercritical fluid intercalation has been proposed. The intercalation of BF4- anion into highly-oriented pyrolytic graphite using a subcritical electrolyte based on a CO2/acetonitrile mixture in a specially designed high-pressure electrochemical cell has been studied. Few-layer graphene flakes and stacks have been obtained through this method.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Engineering, Electrical & Electronic
Seyedeh Fatemeh Aghaie Doost, Narges Ansari
Summary: Magnetic graphene nanocomposites have been synthesized using a simple electrochemical deposition method. The choice of cathode material had a significant impact on the morphological and magnetic properties of the nanocomposites, with nickel cathode synthesis resulting in higher crystallinity of cobalt nanoparticles and better exfoliation of graphene sheets.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Ceramics
Maher T. Alshamkhani, Pooya Lahijani, Keat Teong Lee, Abdul Rahman Mohamed
Summary: In this study, the switching voltage technique was used to efficiently exfoliate graphite in eutectic molten salts. The exfoliated graphene samples exhibited high production yields, low ID/IG ratios, and good electrical conductivities. Compared to constant voltage exfoliation, the switching voltage technique produced smoother graphene flakes with less agglomeration, crumbling, and wrinkling. Characterization analysis confirmed the smaller crystallite size, lower thickness, and higher quality and purity of the exfoliated graphene prepared using the switching voltage technique.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Wanzhen Xu, Wenjie Zhu, Junliang Shen, Mingyue Kuai, Yi Zhang, Weihong Huang, Wenming Yang, Mengmeng Li, Sheng Yang
Summary: Graphene oxide (GO) has various applications in energy devices, biomedicine, environmental protection, and composite materials. A stepwise electrochemical method for fast GO preparation is reported, which involves spontaneous persulfate intercalation and anodic electrolytic oxidation. This method avoids uneven intercalation and insufficient oxidation, significantly shortening the overall duration, and resulting in GO with higher oxygen content and enhanced adsorption capacity compared to traditional methods.
Article
Physics, Multidisciplinary
Ashamoni Neog, Rajib Biswas, Nishant Bharali
Summary: A green route for synthesizing graphene oxide (GO) from waste Zn-C dry cell batteries was comprehensively reported in this study. LiCl was used as the electrolyte for electrochemical synthesis of GO from graphite rods extracted from waste batteries. The satisfactory yield and confirmatory characterizations confirmed the feasibility and efficiency of the synthesis.
Article
Chemistry, Physical
Jianuo Chen, Maria Perez-Page, Zhaoqi Ji, Zhe Zhang, Zunmin Guo, Stuart Holmes
Summary: A 3D-printed reactor was designed for electrochemical exfoliation of natural graphite flakes to obtain high degree of oxidation graphene oxide. By adjusting the electrolyte concentration and reaction time, the degree of oxidation can be further increased. The electrochemically exfoliated graphene oxide was successfully used to prepare composite membranes for high-temperature polymer electrolyte membrane fuel cells, resulting in significant improvement in peak power density.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Multidisciplinary
Xiao-Hua Hu, Rui Zhang, Zhiyong Wu, Shisheng Xiong
Summary: A green and straightforward method has been developed to produce graphene directly from common biomass materials using concentrated solar radiation. The resulting graphene, named concentrated-solar-induced graphene (CSIG), exhibits excellent properties and strong antibacterial potential against Escherichia coli. This method provides a new route for large-scale production of graphene materials from low-cost biomass materials, turning waste into useful materials.
Article
Electrochemistry
Abdul Qayoom Mugheri, Shaista Khan, Ali Asghar Sangah, Aijaz Ahmed Bhutto, Muhammad Younis Laghari, Nadeem Ahmed Mugheri, Asif Ali Jamali, Arsalan Ahmed Mugheri, Nagji Sodho, Abdul Waheed Mastoi, Aftab Kandhro
Summary: Green hydrogen has the potential to transition to a pollution-free energy infrastructure. This study proposes a solution to produce hydrogen during the photoelectrochemical process, offering greater stability and control over chemical reactions. Techno-economic assessments show the efficiency and economic feasibility of co-producing value-added chemicals to enhance green hydrogen production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Danpeng Cheng, Wuxin Sha, Qigao Han, Shun Tang, Jun Zhong, Jinqiao Du, Jie Tian, Yuan-Cheng Cao
Summary: LiNixCoyMn1-x-yO2 (NCM) is a critical cathode material for lithium-ion batteries in electric vehicles. The aging of cathode/electrolyte interfaces leads to capacity degradation and long-term cycle instability. A novel neural network model called ACGNet is developed to predict electrochemical stability windows of crystals, allowing for high-throughput screening of coating materials. LiPO3 is identified as a promising coating material with high oxidation voltage and low cost, which significantly improves the cycle stability of NCM batteries. This study demonstrates the accuracy and potential of machine learning in battery materials.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
P. Mohana, R. Yuvakkumar, G. Ravi, S. Arunmetha
Summary: This study successfully fabricates a non-noble CuO/NiO/rGO nanocomposite and investigates its electrocatalytic performance for oxygen evolution reaction in alkaline environment. The experimental results demonstrate that the electrocatalyst exhibits high activity and good stability, offering a new synthetic approach for sustainable energy production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Qiong Qu, Jing Guo, Hongyu Wang, Kai Zhang, Jingde Li
Summary: In this study, a bifunctional electrode host design consisting of carbon nanofibers implanted ordered porous Co-decorated Al2O3 supported on carbon nanotube film (CNTF) was proposed to address the shuttling effect of lithium polysulfides (LiPSs) and dendrite formation of metal lithium anode in lithium-sulfur (Li-S) batteries. The electrode exhibited excellent conductivity, efficient confinement of LiPSs, and catalytic conversion performance, resulting in high initial capacity and good capacity retention during cycling. As an anode, the electrode showed excellent Li+ diffusion performance and uniform lithium growth behavior, achieving a dendrite-free lithium electrode. The flexible pack cell assembled from these electrodes delivered a specific capacity of 972 mAh g(-1) with good capacity retention.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Hong Zhang, Jin-Peng Yu, Chen Chen, Cheng-Yong Shu, Guang-Yu Xu, Jie Ren, Kai Cui, Wen-Fang Cai, Yun-Hai Wang, Kun Guo
Summary: Spray coating of acetylene black nanoparticles onto stainless steel mesh can enhance its biofilm formation ability and current density, making it a promising electrode material for microbial electrochemical systems. The spray coating method is simple, cost-effective, and suitable for large-size stainless steel electrodes.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Binpeng Hou, Jingjin Chen, Li-Hong Zhang, Xiaowen Shi, Zizhong Zhu
Summary: The electrochemical performance of Li1.20Mn0.44Ni0.32Co0.04O2 and its oxygen-deficient phase Li1.20Mn0.44Ni0.32Co0.04O1.83 was studied through first-principles calculations. The results show that the oxygen-deficient phase has a higher theoretical capacity but lower voltage platform and higher chemical activity compared to the pristine phase.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Yating Du, Sayoko Shironita, Daisuke Asakura, Eiji Hosono, Yoshitsugu Sone, Yugo Miseki, Eiichi Kobayashi, Minoru Umeda
Summary: This study investigates the effect of high- and low-temperature environments on the charge-discharge performance of a Li-ion battery. The deterioration mechanisms of the battery at different temperatures are analyzed through various characterization techniques. The results indicate that the battery performance deteriorates more significantly at a low-temperature environment of 5 degrees C compared to higher temperatures. The understanding of the deterioration mechanisms can contribute to the development of safer battery usage methods.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Si-Si Shi, Zhi-Xiang Yuan, Fei Zhang, Ping Chen
Summary: In this study, a new nano-electrocatalyst was prepared, which exhibited superior electrocatalytic activity for the reduction of NO2- to ammonia in a neutral electrolyte, potentially due to the synergistic enhancement between Co3O4-x and Co.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Berna Dalkiran, Havva Bekirog
Summary: This study reports the use of deep eutectic solvents (DES) based on ethylene glycol and urea as low-cost and green electrolytes for enhancing electrochemical detection of natural antioxidants. The study successfully developed a disposable and effective electrochemical sensing platform for simultaneous determination of ascorbic acid (AA) and gallic acid (GA) using NaOH nanorods on a pencil graphite electrode. The proposed electrode showed improved analytical performance, with higher peak currents and shifted oxidation potentials in DES compared to BR buffer medium.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Sijun Ren, Jianguo Huang
Summary: In this study, a novel bio-inspired nanofibrous WO3/carbon composite was synthesized using a facile hydrothermal method. The three-dimensional network structure of the composite alleviated the volume expansion of WO3 nanorods and enhanced the charge-transport kinetics. The optimized composite exhibited superior lithium storage properties.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Zhilong Zheng, Yu Chen, Hongxia Yin, Hengbo Xiao, Xiangji Zhou, Zhiwen Li, Ximin Li, Jin Chen, Songliu Yuan, Junjie Guo, Haibin Yu, Zhen Zhang, Lihua Qian
Summary: This study found that interstitial Zn cations in CoMoO4 can modulate the dissolution kinetics of Mo cations and improve the OER performance. The interstitial Zn cations can prevent the dissolution of Co cations at high potential, enhancing the durability of the catalyst.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Xiaobo Lin, Shern R. Tee, Debra J. Searles, Peter T. Cummings
Summary: Molecular dynamics simulations using the constant potential method were used to investigate the charging dynamics and charge storage of supercapacitors. The simulations revealed that the water-in-salt electrolyte exhibited the highest charge storage and significantly higher capacitance on the negative electrode. The varying contributions of different electrode regions to supercapacitor performance were also demonstrated.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Wiktoria Lipinska, Vita Saska, Katarzyna Siuzdak, Jakub Karczewski, Karol Zaleski, Emerson Coy, Anne de Poulpiquet, Ievgen Mazurenko, Elisabeth Lojou
Summary: The spatial distribution of enzymes on electrodes is important for bioelectrocatalysis. In this study, controlled spatial distribution of gold nanoparticles on Ti nanodimples was achieved. The efficiency of enzymatic O2 reduction was found to be influenced by the size of the gold nanoparticles and their colocalization with TiO2. The highest stability of enzymatic current was observed with the largest gold nanoparticles.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Tariq M. Al-Hejri, Zeenat A. Shaikh, Ahmed H. Al-Naggar, Siddheshwar D. Raut, Tabassum Siddiqui, Hamdan M. Danamah, Vijaykumar V. Jadhav, Abdullah M. Al-Enizi, Rajaram S. Mane
Summary: This study explores a promising self-growth approach for the synthesis of nickel hydroxide (Ni(OH)2) nanosponge-balls on the surface of a nickel-foam (NiF) electrode. The modified NiF electrode, named Ni(OH)2@NiF, shows distinctive nanosponge-ball morphology and demonstrates excellent energy storage capability and electrocatalytic performance in both hydrogen and oxygen evolution reactions.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Rafael Del Olmo, Gregorio Guzman-Gonzalez, Oihane Sanz, Maria Forsyth, Nerea Casado
Summary: The use of Lithium-Ion Batteries (LIBs) is becoming increasingly extensive, and it is important to optimize the devices to achieve their maximum practical specific capacity. In this study, mixed ionic-electronic conducting (MIEC) binders based on PEDOT:PSS and PEDOT: PDADMA-TFSI were developed for Li-ion cathodes, and their performance was compared with conventional formulations. The influence of electrode formulations, including the addition of conducting carbon and an Organic Ionic Plastic Cristal (OIPC), was also analyzed. The proposed binders showed improved performance compared to conventional formulations with different electrolyte types and active materials.
ELECTROCHIMICA ACTA
(2024)