1
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Zhao Y, Wu J, Fan J. Quantitative Study on the Influence of Bromide Ions toward the Reduction Kinetics for Size-Tunable Palladium Nanocubes. J Phys Chem Lett 2024; 15:549-555. [PMID: 38197906 DOI: 10.1021/acs.jpclett.3c03205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
During the preparation of nanocrystals, regulating the dosage of key additives in the reaction system and the reaction temperature commonly affects the sizes and morphologies of the products. Despite the fact that bromide ions play a pivotal role in the synthesis of palladium nanocubes (Pd NCs), there is still a lack of quantitative and in-depth research on how the ions affect the reduction kinetics of Pd precursors and further on products. In this work, Pd NCs with different sizes have been prepared under various reaction conditions coupled to a systematic mechanism study. Quantitative measurements demonstrate that the reduction processes could be considered quasi-first-order reactions, and the corresponding kinetic parameters have been obtained. Furthermore, a linear relationship is discovered between k and the average size (d) of Pd NCs. The investigation on the growth patterns of four chosen systems reveals that given reaction conditions lead to certain results with unique growth patterns.
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Affiliation(s)
- Yilin Zhao
- Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310058, People's Republic of China
| | - Jianzhou Wu
- Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310058, People's Republic of China
- Zhejiang YaTong Advanced Materials Company, Limited, Hangzhou, Zhejiang 310030, People's Republic of China
| | - Jie Fan
- Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310058, People's Republic of China
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2
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Wang D, Zhang C, Zhang L, Xie X, Lv Y. Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals. Inorg Chem 2024; 63:1247-1257. [PMID: 38154082 DOI: 10.1021/acs.inorgchem.3c03635] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2023]
Abstract
Tuning the surface chemical property and the local environment of nanocrystals is crucial for realizing a high catalytic performance in various reactions. Herein, we aim to elucidate the structure sensitivity of Pd facets on the surface catalytic hydrogenation reaction and to identify what role the nanoconfinement effect plays in the catalytic properties of Pd nanocrystal catalysts. By controlling the coating structures of mesoporous silica (mSiO2) on Pd nanocrystals with different exposed facets that include {100}, {111}, and {hk0}, we present a series of Pd@mSiO2 nanoreactors in core-shell and yolk-shell structures and the discovery of a partial-coated structure, which can provide different types of nanoconfinement, and we propose a seed size-dominated growth mechanism. We demonstrate that a superior activity was exhibited in Pd nanocrystals enclosed by the {hk0} facet as compared to the Pd{100} and Pd{111} facets, and substantially enhanced efficiency and stability were achieved in Pd@mSiO2 particles with yolk-shell structures, indicating a crucial superiority of optimizing the configuration of crystal facets and nanoconfinement. Our study provides an efficient strategy to rationally design and optimize nanocatalysts for promoting catalytic performance.
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Affiliation(s)
- Dongling Wang
- Analytical & Testing Center, Sichuan University, Chengdu 610064, China
| | - Chengchao Zhang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Lichun Zhang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Xiaobin Xie
- Analytical & Testing Center, Sichuan University, Chengdu 610064, China
| | - Yi Lv
- Analytical & Testing Center, Sichuan University, Chengdu 610064, China
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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3
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Han D, Yang H, Zhou Z, Wu K, Ma J, Fang Y, Hong Q, Xi G, Liu S, Shen Y, Zhang Y. Photoelectron Storages in Functionalized Carbon Nitrides for Colorimetric Sensing of Oxygen. ACS Sens 2022; 7:2328-2337. [PMID: 35912931 DOI: 10.1021/acssensors.2c00961] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Colorimetric sensors have been widely used for centuries across diverse fields, thanks to their easy operation and uncompromisingly high sensitivity with no need for electricity. However, it is still a great challenge for conventional chromogenic systems to perform multiple measurements meanwhile maintaining high robustness. Here, we reported that carbon nitrides (CNs), the raw materials that are abundant, structure-tunable, and stable semiconductors with photoelectron storage capability, can be developed as a chromogenic system for colorimetric sensors. Beyond conventional metal oxides that only demonstrated a single blue-color switch after photoelectron storage, CN exhibited a multicolor switch under identical conditions owing to the unusual multiple photoelectron storage pathways. Mechanism studies revealed cyano and carbonyl groups in CN crucially elongated the centroid distance of electrons/holes, which exclusively stabilized the specific excited states that have different light absorption; meanwhile, the counter cations strengthened these processes. As a result, O2, a proof-of-concept analyte, was quantitatively detected by the CN-derived colorimetric sensor, showing high reversibility in hundreds of cycles and adaptable sensitivity/detection range, outperforming most reported and commercial oxygen sensors. These intriguing features of CN are highly envisioned for the next generation of colorimetric sensors, especially in developing countries or fieldworks, to improve the detection reliability and lower the sensing cost.
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Affiliation(s)
- Dan Han
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Medical School, Southeast University, Nanjing 211189, China
| | - Hong Yang
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Medical School, Southeast University, Nanjing 211189, China
| | - Zhixin Zhou
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Medical School, Southeast University, Nanjing 211189, China
| | - Kaiqing Wu
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Medical School, Southeast University, Nanjing 211189, China
| | - Jin Ma
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Medical School, Southeast University, Nanjing 211189, China
| | - Yanfeng Fang
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Medical School, Southeast University, Nanjing 211189, China
| | - Qing Hong
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Medical School, Southeast University, Nanjing 211189, China
| | - Guangcheng Xi
- Institute of Industrial and Consumer Product Safety, Chinese Academy of Inspection and Quarantine, Beijing 100176, P. R. China
| | - Songqin Liu
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Medical School, Southeast University, Nanjing 211189, China
| | - Yanfei Shen
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Medical School, Southeast University, Nanjing 211189, China
| | - Yuanjian Zhang
- Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, State Key Laboratory of Bioelectronics, School of Chemistry and Chemical Engineering, Medical School, Southeast University, Nanjing 211189, China
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4
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Wang J, Xu J, Wang Q, Liu Z, Zhang X, Zhang J, Lei S, Li Y, Mu J, Yang EC. NiO nanobelts with exposed {110} crystal planes as an efficient electrocatalyst for the oxygen evolution reaction. Phys Chem Chem Phys 2022; 24:6087-6092. [PMID: 35212332 DOI: 10.1039/d1cp05236e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The electrocatalytic oxygen evolution reaction (OER) is necessary and challenging for converting renewable electricity into clean fuels, because of its complex proton coupled multielectron transfer process. Herein, we investigated the crystal plane effects of NiO on the electrocatalytic OER activity through combining experimental studies and theoretical calculations. The experimental results reveal that NiO nanobelts with exposed {110} crystal planes show much higher OER activity than NiO nanoplates with exposed {111} planes. The efficient OER activity of the {110} crystal planes comes from their intrinsically high catalytic ability and fast charge transfer kinetics. Density functional theory (DFT) shows that the {110} crystal planes possess a lower theoretical overpotential value for the OER, leading to a high electrocatalytic performance. This research broadens our vision to design efficient OER electrocatalysts by the selective exposure of specific crystal planes.
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Affiliation(s)
- Jiajun Wang
- College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Tianjin Normal University, Tianjin 300387, P. R. China.
| | - Jiaying Xu
- College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Tianjin Normal University, Tianjin 300387, P. R. China.
| | - Qian Wang
- College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Tianjin Normal University, Tianjin 300387, P. R. China.
| | - Zhongyi Liu
- College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Tianjin Normal University, Tianjin 300387, P. R. China.
| | - Xue Zhang
- College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Tianjin Normal University, Tianjin 300387, P. R. China.
| | - Jie Zhang
- College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Tianjin Normal University, Tianjin 300387, P. R. China.
| | - Shulai Lei
- Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang 441053, P. R. China
| | - Yan Li
- College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Tianjin Normal University, Tianjin 300387, P. R. China.
| | - Jianshuai Mu
- College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Tianjin Normal University, Tianjin 300387, P. R. China.
| | - En-Cui Yang
- College of Chemistry, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Tianjin Normal University, Tianjin 300387, P. R. China.
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5
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Yin W, Zhang M, Liu J, Alali KT, Yu J, Zhu J, Liu P, Li R, Wang J. MOF-derived electrochemical catalyst Cu-N/C for the enhancement of amperometric oxygen detection. NANOSCALE 2022; 14:1796-1806. [PMID: 35029625 DOI: 10.1039/d1nr06758c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Electrochemical sensors using ionic liquids as electrolytes for oxygen detection are now getting more and more attention. Recently, an ionic liquid combined with an electrochemically active catalyst system has become popular for boosting the sensing performance of oxygen sensors. In this work, the imidazolyl-based ionic liquid 1-butyl-2,3-dimethylimidazole bis((trifluoromethyl)sulfonyl)imide [Bmmim][TFSI] is first prepared by a facile two-step method. Subsequently, a transition metal and N-codoped porous carbon oxygen reduction electrochemical catalyst Cu-N/C is synthesized by calcining the Cu-doped ZIF-8 precursor and then blending it in different ratios with the ionic liquid [Bmmim][TFSI] as composite electrolytes for oxygen detection. The composite electrolyte Cu-N/C/[Bmmim][TFSI] exhibits increased responses in cyclic voltammetry (CV) and chronoamperometry (CA) relative to that of the pure ionic liquid. Furthermore, the CV and CA data show that 6% Cu-N/C/[Bmmim][TFSI] has the optimum oxygen sensing response with an enhanced reduction peak current, a sensitivity of 0.1678 μA/[% O2] and a good linear fitting coefficient of 0.9991. In conclusion, the results confirm the success of using Cu-N/C as an electrochemical catalyst composed of the Cu-N/C/[Bmmim][TFSI] electrolyte for improving the responsivity, stability and sensitivity towards a wide range of oxygen concentrations.
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Affiliation(s)
- Wenyan Yin
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China.
- College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
| | - Milin Zhang
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China.
- College of science, Heihe University, Heihe 164300, China
| | - Jingyuan Liu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China.
- College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
| | - Khaled Tawfik Alali
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China.
- College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
| | - Jing Yu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China.
- College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
| | - Jiahui Zhu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China.
- College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
| | - Peili Liu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China.
| | - Rumin Li
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China.
| | - Jun Wang
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China.
- College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
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6
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DABCO Derived Nitrogen-Doped Carbon Nanotubes for Oxygen Reduction Reaction (ORR) and Removal of Hexavalent Chromium from Contaminated Water. MATERIALS 2021; 14:ma14112871. [PMID: 34071937 PMCID: PMC8199063 DOI: 10.3390/ma14112871] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 05/24/2021] [Accepted: 05/24/2021] [Indexed: 12/02/2022]
Abstract
Though chemically-derived reduced graphene oxide (CDG) from graphite oxide (GO) precursors is a widely practiced procedure for the large-scale production of graphene, the quality and quantity of thus obtained CDG is dependent on the reduction strategy used. In this work, we report an all-solid-state, residue-free, microwave process for the reduction of graphene oxide and subsequent growth of carbon nanotube ‘separators’ from a single precursor, namely DABCO (1,4-diazabicyclo[2.2.2]octane). The utility of our newly developed technique in efficiently and effectively reducing graphene oxide and in growing nitrogen-doped carbon nanotubes via catalysts like palladium and iron into unique mesoporous, 3-D hierarchical carbon nanostructures is demonstrated. The applicability of the thus obtained palladium embedded in Pd@NCNT-rGO nanoarchitectures for the oxygen reduction reaction (ORR) is investigated. When carbon fiber (CF) was used as the substrate, three-dimensional Fe@NCNT-CF were obtained, whose capability as versatile adsorbents for hexavalent chromium ion removal from contaminated waters was also demonstrated.
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7
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Differing preferential ion binding to the peptide bond in ionic environment from classical and first principles molecular dynamics simulations. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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8
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Baaziz W, Valette S, Gay A, Hirlimann C, Ersen O. A New Methodology for Quantifying the Surface Crystallography of Particles from their Tomographic Reconstruction: Application to Pd Nanoparticles Embedded in a Mesoporous Silica Shell. ChemCatChem 2020. [DOI: 10.1002/cctc.202000275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Walid Baaziz
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) UMR 7504 CNRS – Université de Strasbourg 23 rue du Lœss BP 43 67034 Strasbourg cedex 2 France
| | - Sébastien Valette
- Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS) UMR 5220 – INSERM U1206, Université Lyon 1 – INSA Lyon – Université Jean Monnet Saint-Etienne 7 Avenue Jean Capelle 69100 Villeurbanne France
| | - Anne‐Sophie Gay
- IFP Energies Nouvelles (IFPEN) Rond-point de l'échangeur de Solaize BP 3 69360 Solaize France
| | - Charles Hirlimann
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) UMR 7504 CNRS – Université de Strasbourg 23 rue du Lœss BP 43 67034 Strasbourg cedex 2 France
| | - Ovidiu Ersen
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) UMR 7504 CNRS – Université de Strasbourg 23 rue du Lœss BP 43 67034 Strasbourg cedex 2 France
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9
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Devivaraprasad R, Nalajala N, Bera B, Neergat M. Electrocatalysis of Oxygen Reduction Reaction on Shape-Controlled Pt and Pd Nanoparticles-Importance of Surface Cleanliness and Reconstruction. Front Chem 2019; 7:648. [PMID: 31637231 PMCID: PMC6787902 DOI: 10.3389/fchem.2019.00648] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 09/10/2019] [Indexed: 01/04/2023] Open
Abstract
Shape-controlled precious metal nanoparticles have attracted significant research interest in the recent past due to their fundamental and scientific importance. Because of their crystallographic-orientation-dependent properties, these metal nanoparticles have tremendous implications in electrocatalysis. This review aims to discuss the strategies for synthesis of shape-controlled platinum (Pt) and palladium (Pd) nanoparticles and procedures for the surfactant removal, without compromising their surface structural integrity. In particular, the electrocatalysis of oxygen reduction reaction (ORR) on shape-controlled nanoparticles (Pt and Pd) is discussed and the results are analyzed in the context of that reported with single crystal electrodes. Accepted theories on the stability of precious metal nanoparticle surfaces under electrochemical conditions are revisited. Dissolution, reconstruction, and comprehensive views on the factors that contribute to the loss of electrochemically active surface area (ESA) of nanoparticles leading to an inevitable decrease in ORR activity are presented. The contribution of adsorbed electrolyte anions, in-situ generated adsorbates and contaminants toward the ESA reduction are also discussed. Methods for the revival of activity of surfaces contaminated with adsorbed impurities without perturbing the surface structure and its implications to electrocatalysis are reviewed.
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Affiliation(s)
- Ruttala Devivaraprasad
- Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai, India
| | - Naresh Nalajala
- National Chemical Laboratory, Catalysis Division, Pune, India
| | - Bapi Bera
- Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai, India
| | - Manoj Neergat
- Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai, India
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10
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Tang Y, He J, Gao X, Yang T, Zeng X. Continuous amperometric hydrogen gas sensing in ionic liquids. Analyst 2018; 143:4136-4146. [DOI: 10.1039/c8an00577j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Continuous and real-time ionic liquid based hydrogen gas sensor with high sensitivity, selectivity, speed, accuracy, repeatability and stability.
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Affiliation(s)
- Yongan Tang
- Department of Chemistry
- Oakland University
- Rochester
- USA
| | - Jianxin He
- Department of Computer Science
- The University of Iowa
- Iowa City
- USA
| | - Xiaoli Gao
- Department of Mathematics and Statistics
- University of North Carolina Greensboro
- USA
| | - Tianbao Yang
- Department of Computer Science
- The University of Iowa
- Iowa City
- USA
| | - Xiangqun Zeng
- Department of Chemistry
- Oakland University
- Rochester
- USA
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11
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Tang Y, Lin L, Kumar A, Guo M, Sevilla M, Zeng X. Hydrogen Electrooxidation in Ionic Liquids Catalyzed by the NTf 2 Radical. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:5161-5167. [PMID: 29071009 PMCID: PMC5651517 DOI: 10.1021/acs.jpcc.7b00335] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Hydrogen electrooxidation via a "hydrogen abstraction" mechanism in an aprotic ionic liquid 1-butyl-1-methylpyrrolidinium bis-(trifluoromethylsulfonyl) [Bmpy][NTf2] under anaerobic conditions was investigated using cyclic voltammetry and density functional theory (DFT). It is found that a platinum bound NTf2 radical (NTf2•) formed by the oxidation of NTf2- at anodic potential can catalyze the oxidation of hydrogen and enhance its reaction rate. Both experimental and theoretical studies (DFT) have supported a mechanism involving a NTf2• radical intermediate that catalyzes the hydrogen redox processes.
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Affiliation(s)
- Yongan Tang
- Department of Chemistry, Oakland University, Rochester, Michigan 48309, United States
| | - Lu Lin
- Department of Chemistry, Oakland University, Rochester, Michigan 48309, United States
| | - Anil Kumar
- Department of Chemistry, Oakland University, Rochester, Michigan 48309, United States
| | - Min Guo
- Department of Chemistry, Oakland University, Rochester, Michigan 48309, United States
| | - Michael Sevilla
- Department of Chemistry, Oakland University, Rochester, Michigan 48309, United States
| | - Xiangqun Zeng
- Department of Chemistry, Oakland University, Rochester, Michigan 48309, United States
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12
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Jin Z, Yang M, Chen SH, Liu JH, Li QX, Huang XJ. Tin Oxide Crystals Exposed by Low-Energy {110} Facets for Enhanced Electrochemical Heavy Metal Ions Sensing: X-ray Absorption Fine Structure Experimental Combined with Density-Functional Theory Evidence. Anal Chem 2017; 89:2613-2621. [DOI: 10.1021/acs.analchem.6b04977] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Zhen Jin
- Institute
of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
| | - Meng Yang
- Institute
of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
- Department
of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, PR China
| | - Shao-Hua Chen
- Hefei
National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, PR China
| | - Jin-Huai Liu
- Institute
of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
| | - Qun-Xiang Li
- Hefei
National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, PR China
| | - Xing-Jiu Huang
- Institute
of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
- Department
of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, PR China
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13
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Kumar PK, Rani A, Olasunkanmi LO, Bahadur I, Venkatesu P, Ebenso EE. Probing Molecular Interactions between Ammonium-Based Ionic Liquids and N,N-Dimethylacetamide: A Combined FTIR, DLS, and DFT Study. J Phys Chem B 2016; 120:12584-12595. [PMID: 27973830 DOI: 10.1021/acs.jpcb.6b07535] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The present study investigates the effects of the alkyl chain length of the cationic head-group of some ammonium-based ionic liquids (ILs) (having the same anion) on the interaction between the ILs and N,N-dimethylacetamide (DMA). The molecular interactions between the studied ILs, tetraethylammonium hydroxide (TEAH), tetrapropylammonium hydroxide (TPAH), tetrabutylammonium hydroxide (TBAH), and their binary mixtures with DMA were studied using the Fourier transform infrared spectroscopy (FTIR) technique, dynamic light scattering (DLS) experiments, and quantum chemical calculations. It was observed from both experimental FTIR analysis and theoretical studies that the strength of intermolecular interactions, such as hydrogen bonding, ion-ion interactions, and induced dipole interactions, between the ILs and DMA depends on the alkyl chain length of the IL cation head-group. The interaction of DMA with IL is energetically favorable and occurs via direct interactions between the IL anion and the carbonyl oxygen of DMA. The results further revealed that the shorter the alkyl chain length of the cationic head-group of the ILs, the stronger the interaction with the DMA molecule, such that the strength of interactions between the ILs and DMA follows the order TEAH > TPAH > TBAH. This trend can be attributed to the increased self-organized aggregation with increasing alkyl chain length of the IL cation.
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Affiliation(s)
- Pannuru Kiran Kumar
- Department of Chemistry, School of Mathematical and Physical Sciences, Materials Science Innovation & Modelling (MaSIM) Research Focus Area, Faculty of Agriculture, Science and Technology, North-West University (Mafikeng Campus) , Private Bag X2046, Mmabatho 2735, South Africa
| | - Anjeeta Rani
- Department of Chemistry, University of Delhi , Delhi 110007, India
| | - Lukman O Olasunkanmi
- Department of Chemistry, School of Mathematical and Physical Sciences, Materials Science Innovation & Modelling (MaSIM) Research Focus Area, Faculty of Agriculture, Science and Technology, North-West University (Mafikeng Campus) , Private Bag X2046, Mmabatho 2735, South Africa.,Department of Chemistry, Faculty of Science, Obafemi Awolowo University , Ile-Ife 220005, Nigeria
| | - Indra Bahadur
- Department of Chemistry, School of Mathematical and Physical Sciences, Materials Science Innovation & Modelling (MaSIM) Research Focus Area, Faculty of Agriculture, Science and Technology, North-West University (Mafikeng Campus) , Private Bag X2046, Mmabatho 2735, South Africa
| | | | - Eno E Ebenso
- Department of Chemistry, School of Mathematical and Physical Sciences, Materials Science Innovation & Modelling (MaSIM) Research Focus Area, Faculty of Agriculture, Science and Technology, North-West University (Mafikeng Campus) , Private Bag X2046, Mmabatho 2735, South Africa
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14
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Tang Y, Zeng X. Electrochemical Oxidation of Hydrogen in Bis(trifluoromethylsulfonyl)imide Ionic Liquids under Anaerobic and Aerobic Conditions. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2016; 120:23542-23551. [PMID: 29043009 PMCID: PMC5641470 DOI: 10.1021/acs.jpcc.6b07067] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The electrochemical behavior of hydrogen oxidation on a platinum electrode in two aprotic room temperature ionic liquids (RTILs)-1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [Bmim][NTf2] and 1-butyl-1-methyl-pyrrolidinium bis(trifluoromethylsulfonyl)imide [Bmpy][NTf2]-was investigated in both anaerobic and aerobic conditions. At platinum electrode in the ILs, the first step of hydrogen oxidation is the formation of Pt-H(ad) (the Tafel step), which is similar to those observed in the aqueous electrolytes. However, there are differences in the oxidation steps (the Heyrovsky and Volmer steps). In ILs, the oxidation of Pt-H(ad) forms a hydrogen radical and a proton rather than a proton or a water in aqueous acid or alkaline electrolytes, respectively. This difference is significant as it results in a completely different following reaction pathway in the anaerobic vs aerobic conditions. A coupled chemical reaction between oxygen and hydrogen oxidation intermediates was observed in aerobic conditions which has a correlation with hydrogen concentrations. Furthermore, the overall rate of hydrogen oxidation is shown to be much higher in [Bmpy][NTf2] than that of [Bmim][NTf2], which is rationalized as the result of both higher solubility of hydrogen and the unique IL-electrode interface structure which promotes the hydrogen adsorption in [Bmpy][NTf2] than that of [Bmim][NTf2]. This study is the first example showing that hydrogen oxidation mechanism in aprotic ILs follows two different oxidation mechanisms in anaerobic and aerobic conditions.
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