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Yalcin K, Kurtoğlu-Öztulum SF, Sarac Oztuna FE, Kanat GH, Unal U, Uzun A. Active Sites and Their Individual Turnover Frequencies for Ethylene Hydrogenation on Reduced Graphene Aerogel. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:4044-4053. [PMID: 38369776 DOI: 10.1021/acs.langmuir.3c02848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Abstract
Graphene aerogel (GA) was reduced at various temperatures to prepare a series of reduced graphene aerogels (rGAs) with different surface characteristics. Detailed characterization demonstrated that an increase in the thermal reduction temperature leads to an increase in surface area accompanied by an increase in surface density of defect sites formed by the removal of the oxygen-containing functional groups. rGA samples were then tested for ethylene hydrogenation under identical conditions. A comparison of catalytic performances of each catalyst demonstrated that the rGA sample prepared by reduction in Ar at 900 °C (rGA-900) provides the highest performance compared with others prepared at lower temperatures. Next, we analyzed the per-gram activity of each catalyst as a sum of individual contributions from different defect sites quantified by Raman spectroscopy and CHNS-O analysis to determine the individual turnover frequencies (TOFs) of each active site. This analysis identified polyene-like structures and interstitial defects associated with amorphous sp2 bonded carbon atoms as the dominant active sites responsible for hydrogenation. A comparison of their TOFs further indicated that the polyene-like structures provide approximately ten times higher TOF compared to those associated with the amorphous carbon defects. These results, identifying the dominant active centers and quantifying their corresponding TOFs, provide opportunities toward the rational design of GA-based carbocatalysts.
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Affiliation(s)
- Kaan Yalcin
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
| | - Samira F Kurtoğlu-Öztulum
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
- Department of Materials Science and Technology, Faculty of Science, Turkish-German University, Sahinkaya Cad. 86, Beykoz, 34820 Istanbul, Turkey
| | - F Eylul Sarac Oztuna
- Department of Chemistry, Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
| | - Gizem Hasibe Kanat
- Department of Chemistry, Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
| | - Ugur Unal
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
- Department of Chemistry, Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University Surface Science and Technology Center (KUYTAM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
| | - Alper Uzun
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
- Koç University Surface Science and Technology Center (KUYTAM), Koç University, Rumelifeneri Yolu, Sariyer, 34450 Istanbul, Turkey
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Payanda Konuk O, Alsuhile AAAM, Yousefzadeh H, Ulker Z, Bozbag SE, García-González CA, Smirnova I, Erkey C. The effect of synthesis conditions and process parameters on aerogel properties. Front Chem 2023; 11:1294520. [PMID: 37937209 PMCID: PMC10627014 DOI: 10.3389/fchem.2023.1294520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 10/12/2023] [Indexed: 11/09/2023] Open
Abstract
Aerogels are remarkable nanoporous materials with unique properties such as low density, high porosity, high specific surface area, and interconnected pore networks. In addition, their ability to be synthesized from various precursors such as inorganics, organics, or hybrid, and the tunability of their properties make them very attractive for many applications such as adsorption, thermal insulation, catalysts, tissue engineering, and drug delivery. The physical and chemical properties and pore structure of aerogels are crucial in determining their application areas. Moreover, it is possible to tailor the aerogel properties to meet the specific requirements of each application. This review presents a comprehensive review of synthesis conditions and process parameters in tailoring aerogel properties. The effective parameters from the dissolution of the precursor step to the supercritical drying step, including the carbonization process for carbon aerogels, are investigated from the studies reported in the literature.
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Affiliation(s)
- Ozge Payanda Konuk
- Department of Materials Science and Engineering, Koç University, Istanbul, Türkiye
| | - Ala A. A. M. Alsuhile
- Department of Chemical and Biological Engineering, Koç University, Istanbul, Türkiye
| | - Hamed Yousefzadeh
- Department of Chemical Engineering, Yeditepe University, Atasehir, Istanbul, Türkiye
| | - Zeynep Ulker
- School of Pharmacy, Altinbas University, Istanbul, Türkiye
| | - Selmi E. Bozbag
- Department of Chemical and Biological Engineering, Koç University, Istanbul, Türkiye
| | - C. A. García-González
- Departamento de Farmacología, Farmacia Y Tecnología Farmacéutica, I+D Farma (GI-1645), Faculty of Pharmacy, Instituto de Materiales (iMATUS) and Health Research Institute of Santiago de Compostela (IDIS), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - I. Smirnova
- Institute of Thermal Separation Processes, Hamburg University of Technology, Hamburg, Germany
| | - Can Erkey
- Department of Materials Science and Engineering, Koç University, Istanbul, Türkiye
- Department of Chemical and Biological Engineering, Koç University, Istanbul, Türkiye
- Koç University Tüpraş Energy Center (KUTEM), Koç University, Istanbul, Türkiye
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3
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Ushiki I, Miyajima A, Fujimitsu R, Takishima S. Modeling cobalt (III) acetylacetonate and iron (III) acetylacetonate solubilities in supercritical CO2 with PC-SAFT based on experimentally-determined solid–liquid equilibria in organic solvents. J Supercrit Fluids 2023. [DOI: 10.1016/j.supflu.2023.105882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
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4
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Barim SB, Raptapoulos G, Rommel S, Aindow M, Paraskevopoulou P, Erkey C. Polyamide Aerogel-Derived N-Doped Carbon Aerogel Decorated with Platinum Nanoparticles as Highly Active and Stable Electrocatalysts for Oxygen Reduction Reaction. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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5
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Kurtoğlu-Öztulum SF, KaanYalçın, Zhao Y, Pelin Çağlayan H, Hoffman AS, Gates BC, Bare SR, Ünal U, Uzun A. Transformation of Reduced Graphene Aerogel-Supported Atomically Dispersed Iridium into Stable Clusters Approximated as Ir6 during Ethylene Hydrogenation Catalysis. J Catal 2022. [DOI: 10.1016/j.jcat.2022.04.028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Preparation of Pt/Al2O3 and PtPd/Al2O3 catalysts by supercritical deposition and their performance for oxidation of nitric oxide and propene. Catal Today 2022. [DOI: 10.1016/j.cattod.2020.11.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Yousefzadeh H, Bozbag SE, Erkey C. Supercritical ion exchange: A new method to synthesize copper exchanged zeolites. J Supercrit Fluids 2022. [DOI: 10.1016/j.supflu.2021.105417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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8
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Wang Q, Xu QQ, Yin JZ, Zhu H, Liu BL, Yang MZ. Development of a novel theory of pressure-induced nucleation in supercritical carbon dioxide. CrystEngComm 2022. [DOI: 10.1039/d2ce00187j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nucleation was the basis of the fabrication of two-dimensional materials in the bottom-up methods such as chemical vapor deposition and atomic layer deposition etc. Supercritical fluid deposition (SCFD) might provide...
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Liu H, Chen BQ, Pan YJ, Fu CP, Kankala RK, Wang SB, Chen AZ. Role of supercritical carbon dioxide (scCO 2) in fabrication of inorganic-based materials: a green and unique route. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2021; 22:695-717. [PMID: 34512177 PMCID: PMC8425740 DOI: 10.1080/14686996.2021.1955603] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/29/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
In recent times, the supercritical carbon dioxide (scCO2) process has attracted increasing attention in fabricating diverse materials due to the attractive features of environmentally benign nature and economically promising character. Owing to these unique characteristics and high-penetrability, as well as diffusivity conditions of scCO2, this high-pressure technology, with mild operation conditions, cost-effective, and non-toxic, among others, is often applied to fabricate various organic and inorganic-based materials, resulting in the unique crystal architectures (amorphous, crystalline, and heterojunction), tunable architectures (nanoparticles, nanosheets, and aerogels) for diverse applications. In this review, we give an emphasis on the fabrication of various inorganic-based materials, highlighting the recent research on the driving factors for improving the quality of fabrication in scCO2, procedures for production and dispersion in scCO2, as well as common indicators utilized to assess quality and processing ability of materials. Next, we highlight the effects of specific properties of scCO2 towards synthesizing the highly functional inorganic-based nanomaterials. Finally, we summarize this compilation with interesting perspectives, aiming to arouse a more comprehensive utilization of scCO2 to broaden the horizon in exploring the green/eco-friendly processing of such versatile inorganic-based materials. Together, we firmly believe that this compilation endeavors to disclose the latent capability and universal prevalence of scCO2 in the synthesis and processing of inorganic-based materials.
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Affiliation(s)
- Hao Liu
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- College of Chemical Engineering, Huaqiao University, Xiamen, P. R. China
| | - Biao-Qi Chen
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen, P. R. China
| | - Yu-Jing Pan
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
| | - Chao-Ping Fu
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen, P. R. China
| | - Ranjith Kumar Kankala
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- College of Chemical Engineering, Huaqiao University, Xiamen, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen, P. R. China
| | - Shi-Bin Wang
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen, P. R. China
| | - Ai-Zheng Chen
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen, P. R. China
- College of Chemical Engineering, Huaqiao University, Xiamen, P. R. China
- Fujian Provincial Key Laboratory of Biochemical Technology, Huaqiao University, Xiamen, P. R. China
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10
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Garcia-Bordejé E, Benito AM, Maser WK. Graphene aerogels via hydrothermal gelation of graphene oxide colloids: Fine-tuning of its porous and chemical properties and catalytic applications. Adv Colloid Interface Sci 2021; 292:102420. [PMID: 33934004 DOI: 10.1016/j.cis.2021.102420] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 04/12/2021] [Accepted: 04/12/2021] [Indexed: 02/07/2023]
Abstract
Recently, 3D graphene aerogel has garnered a high interest aiming at benefiting of the excellent properties of graphene in devices for energy storage or environmental remediation. Hydrothermal gelation of GO dispersion is a straightforward method that offers many opportunities for tuning its properties and for processing it to devices. By adjusting hydrothermal gelation and drying conditions, it is possible to tune the density (from ~3 mg cm-3 to ~2 g cm-3), pore volume, pores size (micro to macropores), pore distribution, surface chemical polarity (hydrophobic or hydrophilic), and electrical conductivity (from ~0.5 S m-1 to S cm-1). Besides other well explored applications in energy storage or environmental remediation, graphene aerogels have excellent prospects as support for catalysis since they combine the advantages of graphene sheets (high surface area, high electrical conductivity, surface chemistry tunability, high adsorption capacity…) while circumventing their drawbacks such as difficult separation from reaction media or tendency to stacking. Compared to other 3D porous carbon materials used as catalyst support, graphene aerogels have unique porous structure. The pore walls are the thinnest to be expected for a carbon material (the thickness of monolayer graphene is 0.335 nm), hence leading to the highest exposed surface area per weight and even per volume for compacted aerogels. This has the potential to maximize the catalytic site density per reactor mass and volume while minimizing the pressure drop for continuous reactions in flow. Herein, different strategies to control the porous texture, chemical and physical properties are revised along with their processability and scalability for the implementation into different morphologies and devices. Finally, the application of graphene aerogels in the catalysis field are overviewed, giving a perspective about future directions needing further research.
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Affiliation(s)
| | - A M Benito
- Instituto de Carboquímica (ICB-CSIC), Miguel Luesma Castán 4, E-50018 Zaragoza, Spain
| | - W K Maser
- Instituto de Carboquímica (ICB-CSIC), Miguel Luesma Castán 4, E-50018 Zaragoza, Spain
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11
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Hussain S, Kongi N, Treshchalov A, Kahro T, Rähn M, Merisalu M, Tamm A, Sammelselg V, Tammeveski K. Enhanced oxygen reduction reaction activity and durability of Pt nanoparticles deposited on graphene-coated alumina nanofibres. NANOSCALE ADVANCES 2021; 3:2261-2268. [PMID: 36133775 PMCID: PMC9417899 DOI: 10.1039/d1na00007a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 01/19/2021] [Indexed: 05/05/2023]
Abstract
The oxygen reduction reaction (ORR) activity and stability of Pt catalysts deposited on graphene-coated alumina nanofibres (GCNFs) were investigated. The GCNFs were fabricated by catalyst-free chemical vapour deposition. Pt nanoparticles (NPs) were deposited on the nanofibres by sonoelectrochemical and plasma-assisted synthesis methods. Scanning and transmission electron microscopy analyses revealed different surface morphologies of the prepared Pt catalysts, depending on the synthesis procedure. Sonoelectrochemical deposition resulted in a uniform distribution of smaller Pt NPs on the support surface, while plasma-assisted synthesis, along with well-dispersed smaller Pt NPs, led to particle agglomeration at certain nucleation sites. Further details about the surface features were obtained from cyclic voltammetry and CO stripping experiments in 0.1 M HClO4 solution. Rotating disk electrode investigations revealed that the Pt/GCNF catalyst is more active towards the ORR in acid media than the commercial Pt/C (20 wt%). The prepared catalyst also showed significantly higher durability than commercial Pt/C, with no change in the half-wave potential after 10 000 potential cycles.
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Affiliation(s)
- Sajid Hussain
- Institute of Chemistry, University of Tartu Ravila 14a 50411 Tartu Estonia +372 7375168
| | - Nadezda Kongi
- Institute of Chemistry, University of Tartu Ravila 14a 50411 Tartu Estonia +372 7375168
| | - Alexey Treshchalov
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Tauno Kahro
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Mihkel Rähn
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Maido Merisalu
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Aile Tamm
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Väino Sammelselg
- Institute of Physics, University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
| | - Kaido Tammeveski
- Institute of Chemistry, University of Tartu Ravila 14a 50411 Tartu Estonia +372 7375168
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12
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13
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Ushiki I, Fujimitsu R, Takishima S. Predicting the solubilities of metal acetylacetonates in supercritical CO2: Thermodynamic approach using PC-SAFT. J Supercrit Fluids 2020. [DOI: 10.1016/j.supflu.2020.104909] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Cai B, Eychmüller A. Promoting Electrocatalysis upon Aerogels. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1804881. [PMID: 30536681 DOI: 10.1002/adma.201804881] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Revised: 09/20/2018] [Indexed: 05/27/2023]
Abstract
Electrocatalysis plays a prominent role in renewable energy conversion and storage, enabling a number of sustainable processes for future technologies. There are generally three strategies to improve the efficiency (or activity) of the electrocatalysts: i) increasing the intrinsic activity of the catalyst itself, ii) improving the exposure of active sites, and iii) accelerating mass transfer during catalysis (both reactants and products). These strategies are not mutually exclusive and can ideally be addressed simultaneously, leading to the largest improvements in activity. Aerogels, as featured by large surface area, high porosity, and self-supportability, provide a platform that matches all the aforementioned criteria for the design of efficient electrocatalysts. The field of aerogel synthesis has seen much progress in recent years, mainly thanks to the rapid development of nanotechnology. Employing precursors with different properties enables the resulting aerogel with targeted catalytic properties and improved performances. Here, the design strategies of aerogel catalysts are demonstrated, and their performance for several electrochemical reactions is reviewed. The common principles that govern electrocatalysis are further discussed for each category of reactions, thus serving as a guide to the development of future aerogel electrocatalysts.
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Affiliation(s)
- Bin Cai
- Physikalische Chemie, Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
| | - Alexander Eychmüller
- Physikalische Chemie, Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
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15
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Babucci M, Sarac Oztuna FE, Debefve LM, Boubnov A, Bare SR, Gates BC, Unal U, Uzun A. Atomically Dispersed Reduced Graphene Aerogel-Supported Iridium Catalyst with an Iridium Loading of 14.8 wt %. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02231] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Melike Babucci
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
| | - F. Eylul Sarac Oztuna
- Department of Chemistry, Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
| | - Louise M. Debefve
- Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
| | - Alexey Boubnov
- Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Simon R. Bare
- Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Bruce C. Gates
- Department of Chemical Engineering, University of California, Davis, Davis, California 95616, United States
| | - Ugur Unal
- Department of Chemistry, Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
- Koç University Surface Science and Technology Center (KUYTAM), Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
| | - Alper Uzun
- Department of Chemical and Biological Engineering, Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
- Koç University Surface Science and Technology Center (KUYTAM), Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
- Koç University TÜPRAŞ Energy Center (KUTEM), Koç University, Rumelifeneri Yolu, Sariyer, Istanbul 34450, Turkey
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16
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Beyazay T, Oztuna FES, Unal O, Acar HY, Unal U. Free‐Standing N‐doped Reduced Graphene Oxide Papers Decorated with Iron Oxide Nanoparticles: Stable Supercapacitor Electrodes. ChemElectroChem 2019. [DOI: 10.1002/celc.201900855] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Tugce Beyazay
- Department of Material Science and EngineeringKoç University, Rumelifeneri Yolu 34450 Sariyer Istanbul (Turkey
| | - F. Eylul Sarac Oztuna
- Department of ChemistryKoç University, Rumelifeneri Yolu 34450 Sariyer Istanbul Turkey
| | - Ozlem Unal
- Department of Material Science and EngineeringKoç University, Rumelifeneri Yolu 34450 Sariyer Istanbul (Turkey
| | - Havva Yagci Acar
- Department of Material Science and EngineeringKoç University, Rumelifeneri Yolu 34450 Sariyer Istanbul (Turkey
- Department of ChemistryKoç University, Rumelifeneri Yolu 34450 Sariyer Istanbul Turkey
- Koç University Surface Science and Technology Center (KUYTAM)Koç University, Rumelifeneri Yolu 34450 Sariyer Istanbul Turkey
| | - Ugur Unal
- Department of Material Science and EngineeringKoç University, Rumelifeneri Yolu 34450 Sariyer Istanbul (Turkey
- Department of ChemistryKoç University, Rumelifeneri Yolu 34450 Sariyer Istanbul Turkey
- Koç University Surface Science and Technology Center (KUYTAM)Koç University, Rumelifeneri Yolu 34450 Sariyer Istanbul Turkey
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Ushiki I, Sato Y, Takishima S, Inomata H. Thermodynamic Modeling of the Solubility of Acetylacetonate-Type Metal Precursors in Supercritical Carbon Dioxide Using the PC-SAFT Equation of State. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2019. [DOI: 10.1252/jcej.18we194] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ikuo Ushiki
- Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University
| | - Yoshiyuki Sato
- Research Center of Supercritical Fluid Technology, Graduate School of Engineering, Tohoku University
| | - Shigeki Takishima
- Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University
| | - Hiroshi Inomata
- Research Center of Supercritical Fluid Technology, Graduate School of Engineering, Tohoku University
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18
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Charge storage characteristics of layer-by-layer assembled nickel hydroxide and graphene oxide nanosheets. J Solid State Electrochem 2019. [DOI: 10.1007/s10008-019-04230-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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19
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Sarac Oztuna FE, Yagci MB, Unal U. First‐Row Transition‐Metal Cations (Co
2+
, Ni
2+
, Mn
2+
, Fe
2+
) and Graphene (Oxide) Composites: From Structural Properties to Electrochemical Applications. Chemistry 2019; 25:3131-3140. [DOI: 10.1002/chem.201806309] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Indexed: 01/19/2023]
Affiliation(s)
- F. Eylul Sarac Oztuna
- Department of Material Science and EngineeringKoç University Rumelifeneri Yolu 34450 Sariyer Istanbul Turkey
| | - M. Baris Yagci
- Koç University Surface Science and Technology Center (KUYTAM)Koç University Rumelifeneri Yolu 34450 Sariyer Istanbul Turkey
| | - Ugur Unal
- Department of Material Science and EngineeringKoç University Rumelifeneri Yolu 34450 Sariyer Istanbul Turkey
- Koç University Surface Science and Technology Center (KUYTAM)Koç University Rumelifeneri Yolu 34450 Sariyer Istanbul Turkey
- Department of ChemistryKoç University Rumelifeneri Yolu 34450 Sariyer Istanbul Turkey
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Self-Standing Reduced Graphene Oxide Papers Electrodeposited with Manganese Oxide Nanostructures as Electrodes for Electrochemical Capacitors. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.11.033] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Green Fabrication of Supported Platinum Nanoparticles by Supercritical CO₂ Deposition. MATERIALS 2018; 11:ma11122587. [PMID: 30567419 PMCID: PMC6315460 DOI: 10.3390/ma11122587] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 12/14/2018] [Accepted: 12/16/2018] [Indexed: 11/17/2022]
Abstract
Pt nanoparticles were successfully deposited on uncatalyzed carbon paper by the supercritical CO2 deposition (SCD) method using platinum (II) acetylacetonate as a precursor followed by thermal conversion. A full 24 factorial design (four factors, each with two levels) was used to investigate the main effect of four factors (deposition temperature, deposition time, reduction temperature, and reduction time) and the interaction effects between them. The morphological structures and surface properties of the Pt/carbon paper composite were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM)/energy-dispersive X-ray spectroscopy analyzer (EDS), and high-resolution transmission electron microscopy (HR-TEM). The results of the 24 factorial design showed that Pt loading on the substrate correlated significantly with deposition time, while Pt aggregation slightly increased with the thermal reduction temperature. Data obtained from both XRD and HR-TEM were in good agreement and showed that Pt nanoparticles were homogeneously dispersed on the substrate with diameters of 7.2–8.7 nm.
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Measurement and modeling of adsorption equilibria of cobalt (III) acetylacetonate on MCM-41 mesoporous silica in the presence of supercritical carbon dioxide with methanol co-solvent. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2018.06.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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23
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Adsorption kinetics of rhodium (III) acetylacetonate onto mesoporous silica adsorbents in the presence of supercritical carbon dioxide. J Supercrit Fluids 2018. [DOI: 10.1016/j.supflu.2018.01.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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24
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Lv Y, Wang X, Mei T, Li J, Wang J. Single-Step Hydrothermal Synthesis of N, S-Dual-Doped Graphene Networks as Metal-Free Efficient Electrocatalysts for Oxygen Reduction Reaction. ChemistrySelect 2018. [DOI: 10.1002/slct.201800098] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yang Lv
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials; Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials; Hubei Key Laboratory of Polymer Materials (Hubei University); School of Materials Science and Engineering; Hubei University; Wuhan 430062, PR China
| | - Xianbao Wang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials; Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials; Hubei Key Laboratory of Polymer Materials (Hubei University); School of Materials Science and Engineering; Hubei University; Wuhan 430062, PR China
| | - Tao Mei
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials; Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials; Hubei Key Laboratory of Polymer Materials (Hubei University); School of Materials Science and Engineering; Hubei University; Wuhan 430062, PR China
| | - Jinhua Li
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials; Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials; Hubei Key Laboratory of Polymer Materials (Hubei University); School of Materials Science and Engineering; Hubei University; Wuhan 430062, PR China
| | - Jianying Wang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials; Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials; Hubei Key Laboratory of Polymer Materials (Hubei University); School of Materials Science and Engineering; Hubei University; Wuhan 430062, PR China
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25
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Yu J, Chen D, Saccoccio M, Lam K, Ciucci F. Promotion of Oxygen Reduction with Both Amorphous and Crystalline MnO
x
through the Surface Engineering of La0.8
Sr0.2
MnO3-δ
Perovskite. ChemElectroChem 2018. [DOI: 10.1002/celc.201701248] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jing Yu
- Department of Mechanical and Aerospace Engineering; The Hong Kong University of Science and Technology; Hong Kong China
| | - Dengjie Chen
- Department of Chemistry, College of Chemistry and Materials Science; Jinan University; Guangzhou 510632 China
| | - Mattia Saccoccio
- Department of Mechanical and Aerospace Engineering; The Hong Kong University of Science and Technology; Hong Kong China
| | - Kwunyu Lam
- Department of Mechanical and Aerospace Engineering; The Hong Kong University of Science and Technology; Hong Kong China
| | - Francesco Ciucci
- Department of Mechanical and Aerospace Engineering; The Hong Kong University of Science and Technology; Hong Kong China
- Department of Chemical and Biomolecular Engineering; The Hong Kong University of Science and Technology; Hong Kong China
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