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Lee G, Lee Y, Doh S, Han B, Kim Y, Kim K, Kim HJ. Lab- and pilot-scale wet scrubber study on the redox-mediated simultaneous removal of NO x and SO 2 using a CaCO 3-based slurry with KI as a redox catalyst. CHEMOSPHERE 2024; 355:141809. [PMID: 38548080 DOI: 10.1016/j.chemosphere.2024.141809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 03/13/2024] [Accepted: 03/25/2024] [Indexed: 04/06/2024]
Abstract
This study presents a novel approach that integrates ozone-driven chemical oxidation to convert NO into soluble NO2, followed by the simultaneous absorption of NO2 and SO2 into a CaCO3-based slurry using the redox catalyst potassium iodide (KI). Using cyclic voltammetry, we demonstrate the redox properties of the I2/2I- couple, which facilitates NO2 reduction into soluble NO2- and catalyst regeneration through sulfite (SO32-)-driven reduction, thus establishing a closed catalytic cycle within the components of flue gas. In lab-scale wet-scrubbing tests, we explore the effect of various operational parameters (i.e., KI concentration, pH, and SO2 concentration), with a 15 h stability test demonstrating >60% NOx and >99% SO2 removal efficiency when the pH is controlled between 7.5 and 8.5. A successful pilot-scale implementation conducted at an inlet flow rate of 1000 m3 h-1 further confirmed the reproducibility of the proposed redox-catalytic cycle. Our study offers a cost-effective, sustainable, and scalable solution for effectively mitigating NOx and SO2 emissions at low temperatures.
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Affiliation(s)
- Gwangtaek Lee
- Department of Urban Environment Research, Eco-Friendly Energy Conversion Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34103, Republic of Korea
| | - Yeawan Lee
- Department of Urban Environment Research, Eco-Friendly Energy Conversion Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34103, Republic of Korea
| | - Sunghoon Doh
- Graduate School of Carbon Neutrality, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, 44919, Republic of Korea
| | - Bangwoo Han
- Department of Urban Environment Research, Eco-Friendly Energy Conversion Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34103, Republic of Korea; University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Yongjin Kim
- Department of Urban Environment Research, Eco-Friendly Energy Conversion Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34103, Republic of Korea
| | - Kwiyong Kim
- Graduate School of Carbon Neutrality, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, 44919, Republic of Korea; Department of Civil, Urban, Earth, and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, 44919, Republic of Korea.
| | - Hak-Joon Kim
- Department of Urban Environment Research, Eco-Friendly Energy Conversion Research Division, Korea Institute of Machinery & Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon, 34103, Republic of Korea; University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea.
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2
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Nabi S, Sofi FA, Jan Q, Bhat AY, Ingole PP, Bayati M, Bhat MA. The enhanced electrocatalytic performance of nanoscopic Cu 6Pd 12Fe 12 heterometallic molecular box encaged cytochrome c. NANOSCALE 2023; 16:411-426. [PMID: 38073595 DOI: 10.1039/d3nr03451h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Designing molecular cages for atomic/molecular scale guests is a special art used by material chemists to harvest the virtues of the otherwise vile idea known as "the cage". In recent years, there has been a notable surge in research investigations focused on the exploration and utilization of the distinct advantages offered by this art in the advancement of efficient and stable bio-electrocatalysts. This usually is achieved through encapsulation of biologically accessible redox proteins within specifically designed molecular cages and matrices. Herein, we present the first successful method for encaging cytochrome c (Cyt-c), a clinically significant enzyme system, inside coordination-driven self-assembled Cu6Pd12Fe12 heterometallic hexagonal molecular boxes (Cu-HMHMB), in order to create a Cyt-c@Cu-HMHMB composite. 1H NMR, FTIR, and UV-Vis spectroscopy, ICP-MS, TGA and voltammetric investigations carried out on the so-crafted Cyt-c@Cu-HMHMB bio-inorganic composite imply that the presented strategy ensures encaging of Cyt-c in a catalytically active, electrochemically stable and redox-accessible state inside the Cu-HMHMB. Cyt-c@Cu-HMHMB is demonstrated to exhibit excellent stability and electrocatalytic activity toward very selective, sensitive electrochemical sensing of nitrite exhibiting a limit of detection as low as 32 nanomolar and a sensitivity of 7.28 μA μM-1 cm-2. Importantly, Cyt-c@Cu-HMHMB is demonstrated to exhibit an excellent electrocatalytic performance toward the 4ē pathway oxygen reduction reaction (ORR) with an onset potential of 0.322 V (vs. RHE) and a Tafel slope of 266 mV dec-1. Our findings demonstrate that Cu-HMHMB is an excellent matrix for Cyt-c encapsulation. We anticipate that the entrapment-based technique described here will be applicable to other enzyme systems and Cyt-c for various electrochemical and other applications.
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Affiliation(s)
- Shazia Nabi
- Department of Chemistry, University of Kashmir, Srinagar-190006, J & K, India.
| | - Feroz Ahmad Sofi
- Department of Chemistry, University of Kashmir, Srinagar-190006, J & K, India.
| | - Qounsar Jan
- Department of Chemistry, University of Kashmir, Srinagar-190006, J & K, India.
| | - Aamir Y Bhat
- Department of Chemistry, Indian Institute of Technology (IIT) Delhi, New Delhi 110016, India
| | - Pravin P Ingole
- Department of Chemistry, Indian Institute of Technology (IIT) Delhi, New Delhi 110016, India
| | - Maryam Bayati
- Department of Mechanical & Construction Engineering, Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
| | - Mohsin Ahmad Bhat
- Department of Chemistry, University of Kashmir, Srinagar-190006, J & K, India.
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3
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Rupar J, Dobričić V, Brborić J, Čudina O, Aleksić MM. Square wave voltammetric study of interaction between 9-acridinyl amino acid derivatives and DNA. Bioelectrochemistry 2022; 149:108323. [DOI: 10.1016/j.bioelechem.2022.108323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 10/27/2022] [Accepted: 11/07/2022] [Indexed: 11/13/2022]
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4
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Paisanpisuttisin A, Poonwattanapong P, Rakthabut P, Ariyasantichai P, Prasittichai C, Siriwatcharapiboon W. Sensitive electrochemical sensor based on nickel/PDDA/reduced graphene oxide modified screen-printed carbon electrode for nitrite detection. RSC Adv 2022; 12:29491-29502. [PMID: 36320740 PMCID: PMC9562089 DOI: 10.1039/d2ra03918d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2022] [Accepted: 09/30/2022] [Indexed: 12/02/2022] Open
Abstract
A simple, rapid method of the determination of nitrite in food samples is reported by using a highly sensitive electrochemical sensor based on nickel, poly(diallyldimethylammonium chloride) (PDDA), reduced graphene oxide (rGO) and a disposable screen-printed carbon electrode (SPCE). The method is based on a modification of the electrode to enhance the sensitivity and selectivity of the disposable and applicable SPCE, which is essential for the present analytical challenge. The nitrite determination was performed by using a cyclic voltammetry (CV) method under optimum conditions. Ni/PDDA/rGO/SPCE showed a linear working range of 6 to 100 μM of nitrite concentration. The limit of detection and limit of quantification were 1.99 μM (S/N = 3) and 6.6 μM (S/N = 10), respectively. The sensitivities were 0.453 μA μM-1 cm-2 for the lower concentration range and 0.171 μA μM-1 cm-2 for the higher concentration range. The Ni/PDDA/rGO sensor also showed excellent anti-interference ability and good long-term stability. The purposed disposable sensor was successfully applied to determine nitrite in sausages and pickled vegetable samples with satisfactory recovery.
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Affiliation(s)
| | | | - Punnada Rakthabut
- Department of Chemistry, Faculty of Science, Kasetsart UniversityBangkok 10900Thailand
| | | | - Chaiya Prasittichai
- Department of Chemistry, Faculty of Science, Kasetsart UniversityBangkok 10900Thailand,Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart UniversityBangkok 10900Thailand
| | - Wilai Siriwatcharapiboon
- Department of Chemistry, Faculty of Science, Kasetsart UniversityBangkok 10900Thailand,Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart UniversityBangkok 10900Thailand
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5
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A facile and efficient nitrite electrochemical sensor based on N, O co-doped porous graphene film. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107361] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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6
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Ndebele N, Nyokong T. The Electrocatalytic Detection of Nitrite Using Manganese Schiff Base Phthalocyanine Complexes. Electrocatalysis (N Y) 2022. [DOI: 10.1007/s12678-022-00752-4] [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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7
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Ndebele N, Mgidlana S, nyokong T. Electrochemical Detection of Nitrite Using an Asymmetrically Substituted Cobalt Phthalocyanine Conjugated to Metal Tungstate Nanoparticles. ELECTROANAL 2022. [DOI: 10.1002/elan.202100396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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8
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Tajiki A, Abdouss M, Sadjadi S, Mazinani S, Ramakrishna S. Photo-induced green synthesis of bimetallic Ag/Pd nanoparticles decorated reduced graphene oxide/nitrogen-doped graphene quantum dots nanocomposite as an amperometric sensor for nitrite detection. Anal Bioanal Chem 2021; 413:6289-6301. [PMID: 34345948 DOI: 10.1007/s00216-021-03584-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 07/17/2021] [Accepted: 07/27/2021] [Indexed: 11/24/2022]
Abstract
The present study introduces a novel nanocomposite based on reduced graphene oxide, nitrogen-doped graphene quantum dots, and palladium and silver nanoparticles (rGO/NGQD/AgPd) as an electrocatalyst toward nitrite oxidation reaction. Metal nanoparticles were prepared via a green one-pot photochemical reduction procedure utilizing UV light and NGQD simultaneously as a reducing and directing agent. Formation of the nanocomposite was thoroughly demonstrated by the FT-IR, XRD, Raman, XPS, FE-SEM, and TEM characterization tests. Various electrochemical tests evaluated the efficiency of the prepared sensing platform on the surface of a gold working electrode. Sensitivity and limit of detection (LOD) were calculated to be 0.854 μA.μM-1.cm-2 and 0.052 μM, respectively, from the chronoamperometry data. Finally, the proposed sensor was successfully applied for the determination of nitrite ions in river and mineral water samples as natural water sources.
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Affiliation(s)
- Alireza Tajiki
- Chemistry Department, Amirkabir University of Technology, Tehran, 1591634311, Iran
| | - Majid Abdouss
- Chemistry Department, Amirkabir University of Technology, Tehran, 1591634311, Iran.
| | - Sodeh Sadjadi
- Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran
| | - Saeedeh Mazinani
- New Technologies Research Center (NTRC), Amirkabir University of Technology, Tehran, 1591634311, Iran
| | - Seeram Ramakrishna
- Department of Mechanical Engineering, Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore, 119260, Singapore
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9
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Hou C, Luo Q, He Y, Zhang H. Potentiostatic electrodeposition of gold nanoparticles: variation of electrocatalytic activity toward four targets. J APPL ELECTROCHEM 2021. [DOI: 10.1007/s10800-021-01604-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Stojanov L, Guziejewski D, Puiu M, Bala C, Mirceski V. Multi-frequency analysis in a single square-wave chronoamperometric experiment. Electrochem commun 2021. [DOI: 10.1016/j.elecom.2021.106943] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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11
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Li J, Wei J, Gao Z, Yin G, Li H. The oxidative reactivity of three manganese(III) porphyrin complexes with hydrogen peroxide and nitrite toward catalytic nitration of protein tyrosine. Metallomics 2021; 13:6134099. [PMID: 33576808 DOI: 10.1093/mtomcs/mfab005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 01/10/2021] [Accepted: 02/04/2021] [Indexed: 11/12/2022]
Abstract
Understanding the toxicological properties of MnIII-porphyrins (MnTPPS, MnTMPyP, or MnTBAP) can provide important biochemical rationales in developing them as the therapeutic drugs against protein tyrosine nitration-induced inflammation diseases. Here, we present a comprehensive understanding of the pH-dependent redox behaviors of these MnIII-porphyrins and their structural effects on catalyzing bovine serum albumin (BSA) nitration in the presence of H2O2 and NO2-. It was found that both MnTPPS and MnTBAP stand out in catalyzing BSA nitration at physiologically close condition (pH 8), yet they are less effective at pH 6 and 10. MnTMPyP was shown to have no ability to catalyze BSA nitration under all tested pHs (pH 6, 8, and 10). The kinetics and active intermediate determination through electrochemistry method revealed that both the pH-dependent redox behavior of the central metal cation and the antioxidant capability of porphin derivative contribute to the catalytic activities of three MnIII-porphyrins in BSA nitration in the presence of H2O2/NO2-. These comprehensive studies on the oxidative reactivity of MnIII-porphyrins toward BSA nitration may provide new clues for searching the manganese-based therapeutic drugs against the inflammation-related diseases.
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Affiliation(s)
- Jiayu Li
- Hubei Provincial Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Jingjing Wei
- Hubei Provincial Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Zhonghong Gao
- Hubei Provincial Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Guochuan Yin
- Hubei Provincial Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Hailing Li
- Hubei Provincial Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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12
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Chang TE, Chuang CH, Kung CW. An iridium-decorated metal–organic framework for electrocatalytic oxidation of nitrite. Electrochem commun 2021. [DOI: 10.1016/j.elecom.2020.106899] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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13
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Rupar J, Aleksić MM, Dobričić V, Brborić J, Čudina O. An electrochemical study of 9-chloroacridine redox behavior and its interaction with double-stranded DNA. Bioelectrochemistry 2020; 135:107579. [DOI: 10.1016/j.bioelechem.2020.107579] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Revised: 05/25/2020] [Accepted: 05/31/2020] [Indexed: 10/24/2022]
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14
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Suma B P, Pandurangappa M. Graphene oxide/copper terephthalate composite as a sensing platform for nitrite quantification and its application to environmental samples. J Solid State Electrochem 2019. [DOI: 10.1007/s10008-019-04454-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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15
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Mali SM, Narwade SS, Navale YH, Tayade SB, Digraskar RV, Patil VB, Kumbhar AS, Sathe BR. Heterostructural CuO-ZnO Nanocomposites: A Highly Selective Chemical and Electrochemical NO 2 Sensor. ACS OMEGA 2019; 4:20129-20141. [PMID: 31815213 PMCID: PMC6893959 DOI: 10.1021/acsomega.9b01382] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 10/02/2019] [Indexed: 05/24/2023]
Abstract
A simple one-step chemical method is employed for the successful synthesis of CuO(50%)-ZnO(50%) nanocomposites (NCs) and investigation of their gas sensing properties. The X-ray diffraction studies revealed that these CuO-ZnO NCs display a hexagonal wurtzite-type crystal structure. The average width of 50-100 nm and length of 200-600 nm of the NCs were confirmed by transmission electron microscopic images, and the 1:1 proportion of Cu and Zn composition was confirmed by energy-dispersive spectra, i.e., CuO(50%)-ZnO(50%) NC studies. The CuO(50%)-ZnO(50%) NCs exhibit superior gas sensing performance with outstanding selectivity toward NO2 gas at a working temperature of 200 °C. Moreover, these NCs were used for the indirect evaluation of NO2 via electrochemical detection of NO2 - (as NO2 converts into NO2 - once it reacts with moisture, resulting into acid rain, i.e., indirect evaluation of NO2). As compared with other known modified electrodes, CuO(50%)-ZnO(50%) NCs show an apparent oxidation of NO2 - with a larger peak current for a wider linear range of nitrite concentration from 20 to 100 mM. We thus demonstrate that the as-synthesized CuO(50%)-ZnO(50%) NCs act as a promising low-cost NO2 sensor and further confirm their potential toward tunable gas sensors (electrochemical and solid state) (Scheme 1).
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Affiliation(s)
- Shivsharan M. Mali
- Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431004, MH, India
| | - Shankar S. Narwade
- Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431004, MH, India
| | - Yuvraj H. Navale
- Functional
Materials Research Laboratory, School of Physical Sciences, Solapur University, Solapur 413255, MH, India
| | - Sakharam B. Tayade
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, MH, India
| | - Renuka V. Digraskar
- Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431004, MH, India
| | - Vikas B. Patil
- Functional
Materials Research Laboratory, School of Physical Sciences, Solapur University, Solapur 413255, MH, India
| | - Avinash S. Kumbhar
- Department of Chemistry, Savitribai Phule Pune University, Pune 411007, MH, India
| | - Bhaskar R. Sathe
- Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431004, MH, India
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16
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Sandford C, Edwards MA, Klunder KJ, Hickey DP, Li M, Barman K, Sigman MS, White HS, Minteer SD. A synthetic chemist's guide to electroanalytical tools for studying reaction mechanisms. Chem Sci 2019; 10:6404-6422. [PMID: 31367303 PMCID: PMC6615219 DOI: 10.1039/c9sc01545k] [Citation(s) in RCA: 180] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 05/23/2019] [Indexed: 12/19/2022] Open
Abstract
Monitoring reactive intermediates can provide vital information in the study of synthetic reaction mechanisms, enabling the design of new catalysts and methods. Many synthetic transformations are centred on the alteration of oxidation states, but these redox processes frequently pass through intermediates with short life-times, making their study challenging. A variety of electroanalytical tools can be utilised to investigate these redox-active intermediates: from voltammetry to in situ spectroelectrochemistry and scanning electrochemical microscopy. This perspective provides an overview of these tools, with examples of both electrochemically-initiated processes and monitoring redox-active intermediates formed chemically in solution. The article is designed to introduce synthetic organic and organometallic chemists to electroanalytical techniques and their use in probing key mechanistic questions.
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Affiliation(s)
- Christopher Sandford
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , USA . ; ;
| | - Martin A Edwards
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , USA . ; ;
| | - Kevin J Klunder
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , USA . ; ;
| | - David P Hickey
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , USA . ; ;
| | - Min Li
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , USA . ; ;
| | - Koushik Barman
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , USA . ; ;
| | - Matthew S Sigman
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , USA . ; ;
| | - Henry S White
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , USA . ; ;
| | - Shelley D Minteer
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , USA . ; ;
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17
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Cumba LR, Foster CW, Brownson DAC, Smith JP, Iniesta J, Thakur B, do Carmo DR, Banks CE. Can the mechanical activation (polishing) of screen-printed electrodes enhance their electroanalytical response? Analyst 2018; 141:2791-9. [PMID: 26883598 DOI: 10.1039/c6an00167j] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The mechanical activation (polishing) of screen-printed electrodes (SPEs) is explored and shown to exhibit an improved voltammetric response (in specific cases) when polished with either commonly available alumina slurry or diamond spray. Proof-of-concept is demonstrated for the electrochemical sensing of nitrite where an increase in the voltammetric current is found using both polishing protocols, exhibiting an improved limit of detection (3σ) and a two-fold increase in the electroanalytical sensitivity compared to the respective un-polished counterpart. It is found that mechanical activation/polishing increases the C/O ratio which significantly affects inner-sphere electrochemical probes only (whereas outer-sphere systems remain unaffected). Mechanical activation/polishing has the potential to be a simple pre-treatment technique that can be extended and routinely applied towards other analytes for an observable improvement in the electroanalytical response.
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Affiliation(s)
- Loanda R Cumba
- Faculdade de Engenharia de Ilha Solteira UNESP - Universidade Estadual Paulista, Departamento de Física e Química. Av. Brasil Centro, 56 CEP 15385-000, Ilha Solteira, SP, Brazil and Faculty of Science and Engineering, School of Science and the Environment, Division of Chemistry and Environmental Science, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK.
| | - Christopher W Foster
- Faculty of Science and Engineering, School of Science and the Environment, Division of Chemistry and Environmental Science, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK.
| | - Dale A C Brownson
- Faculty of Science and Engineering, School of Science and the Environment, Division of Chemistry and Environmental Science, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK.
| | - Jamie P Smith
- Faculty of Science and Engineering, School of Science and the Environment, Division of Chemistry and Environmental Science, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK.
| | - Jesus Iniesta
- Physical Chemistry Department and Institute of Electrochemistry, University of Alicante, 03690, San Vicente del Raspeig, Alicante, Spain
| | - Bhawana Thakur
- Chemistry Division, Modular Labs, Bhabha Atomic Research Centre, Trombay 400085, India
| | - Devaney R do Carmo
- Faculdade de Engenharia de Ilha Solteira UNESP - Universidade Estadual Paulista, Departamento de Física e Química. Av. Brasil Centro, 56 CEP 15385-000, Ilha Solteira, SP, Brazil
| | - Craig E Banks
- Faculty of Science and Engineering, School of Science and the Environment, Division of Chemistry and Environmental Science, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, UK.
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18
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Lin H, Ding L, Zhang B, Huang J. Detection of nitrite based on fluorescent carbon dots by the hydrothermal method with folic acid. ROYAL SOCIETY OPEN SCIENCE 2018; 5:172149. [PMID: 29892401 PMCID: PMC5990765 DOI: 10.1098/rsos.172149] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 03/27/2018] [Indexed: 05/31/2023]
Abstract
A fluorescent carbon dots probe for the detection of aqueous nitrite was fabricated by a one-pot hydrothermal method, and the transmission electron microscope, X-ray diffractometer, UV-Vis absorption spectrometer and fluorescence spectrophotometer were used to study the property of carbon dots. The fluorescent property of carbon dots influenced by the concentration of aqueous nitrite was studied. The interaction between the electron-donating functional groups and the electron-accepting nitrous acid could account for the quenching effect on carbon dots by adding aqueous nitrite. The products of the hydrolysis of aqueous nitrite performed a stronger quenching effect at lower pH. The relationship between the relative fluorescence intensity of carbon dots and the concentration of nitrite was described by the Stern-Volmer equation (I0/I - 1 = 0.046[Q]) with a fine linearity (R2 = 0.99). The carbon dots-based probe provides a convenient method for the detection of nitrite concentration.
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Affiliation(s)
| | - Liyun Ding
- National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, People's Republic of China
| | | | - Jun Huang
- National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430070, People's Republic of China
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19
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Queiroz NL, Nascimento ML, Nascimento JAM, Nascimento VB, Oliveira SCB. Electrochemistry Study of Antineoplastic Raltitrexed Oxidation Mechanism and its Interaction with DNA. ELECTROANAL 2018. [DOI: 10.1002/elan.201800087] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Nathalia L. Queiroz
- Departamento de Química; Universidade Federal Rural de Pernambuco; 52171-900 Recife, PE Brasil, Tel: +55-81-3320-6375
| | - Maysa L. Nascimento
- Departamento de Química; Universidade Federal Rural de Pernambuco; 52171-900 Recife, PE Brasil, Tel: +55-81-3320-6375
| | - José A. M. Nascimento
- Departamento de Química; Universidade Federal Rural de Pernambuco; 52171-900 Recife, PE Brasil, Tel: +55-81-3320-6375
| | - Valberes B. Nascimento
- Departamento de Química; Universidade Federal Rural de Pernambuco; 52171-900 Recife, PE Brasil, Tel: +55-81-3320-6375
| | - Severino Carlos B. Oliveira
- Departamento de Química; Universidade Federal Rural de Pernambuco; 52171-900 Recife, PE Brasil, Tel: +55-81-3320-6375
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20
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Tubular-structured polypyrrole electrodes decorated with gold nanoparticles for electrochemical sensing. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.01.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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21
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Song P, Ma H, Meng L, Wang Y, Nguyen HV, Lawrence NS, Fisher AC. Fourier transform large amplitude alternating current voltammetry investigations of the split wave phenomenon in electrocatalytic mechanisms. Phys Chem Chem Phys 2017; 19:24304-24315. [PMID: 28849830 DOI: 10.1039/c7cp03510a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fourier transform large amplitude alternating current voltammetry (FTACV) studies are reported on an electrocatalytic (EC') mechanistic system which exhibits split wave behavior on both macro- and micro-size working electrodes. The electrochemical characteristics of the EC' mechanism were analysed using the fundamental to fourth harmonic components deduced by the Fourier transform algorithm. The effects of the sinusoidal frequencies of the applied potential, electrode geometry and substrate concentrations are investigated. The split wave phenomenon was observed and explored particularly.
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Affiliation(s)
- Peng Song
- Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing 100124, China
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22
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Wang P, Wang M, Zhou F, Yang G, Qu L, Miao X. Development of a paper-based, inexpensive, and disposable electrochemical sensing platform for nitrite detection. Electrochem commun 2017. [DOI: 10.1016/j.elecom.2017.06.006] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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23
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Xiong Y, Wang CJ, Tao T, Duan M, Fang SW, Zheng M. A miniaturized fiber-optic colorimetric sensor for nitrite determination by coupling with a microfluidic capillary waveguide. Anal Bioanal Chem 2016; 408:3413-23. [PMID: 26939671 DOI: 10.1007/s00216-016-9415-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Revised: 01/26/2016] [Accepted: 02/10/2016] [Indexed: 10/22/2022]
Abstract
A microfluidic-capillary-waveguide-coupled fiber-optic sensor was developed for colorimetric determination of hazardous nitrite based on the Griess-Ilosvay reaction. The sensor was modularly designed by use of a light-emitting diode as the light source, silica fiber as the light transmission element, and a capillary waveguide tube as the light reaction flow cell. With the light interacting with the azo dye generated by the Griess-Ilosvay reaction between nitrite and Griess reagents, nitrite could be determined by a colorimetric method according to Beer's law. By use of the inexpensive and micro-sized elements mentioned above, the sensor provided a new low-cost and portable method for in situ and online measurement of nitrite. The sensor had a wide linear range for nitrite from 0.02 to 1.8 mg L(-1) and a low detection limit of 7 μg L(-1) (3σ), with a relative standard deviation of 0.37% (n = 10). With a low reagent demand of 200 μL, a short response time of 6.24 s, and excellent selectivity, the sensor is environmentally friendly and has been applied to nitrite determination in different water samples. The results were compared with those obtained by conventional spectrophotometry and ion chromatography, indicating the sensor's potential for practical applications.
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Affiliation(s)
- Yan Xiong
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China.,Oil and Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
| | - Cheng-Jie Wang
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
| | - Tao Tao
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
| | - Ming Duan
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China. .,Oil and Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu, Sichuan, 610500, China.
| | - Shen-Wen Fang
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
| | - Min Zheng
- State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China
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24
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Song P, Fisher AC, Wadhawan JD, Cooper JJ, Ward HJ, Lawrence NS. A mechanistic study of the EC′ mechanism – the split wave in cyclic voltammetry and square wave voltammetry. RSC Adv 2016. [DOI: 10.1039/c6ra08723j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this paper, a detailed investigation of electrochemical reactions coupled with homogenous chemical steps using cyclic voltammetry (CV) and square wave voltammetry (SWV) was carried out to study the electrocatalytic (EC′) mechanism.
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Affiliation(s)
- Peng Song
- Department of Chemical Engineering and Biotechnology
- University of Cambridge
- Cambridge
- UK
- Schlumberger Gould Research Center
| | - Adrian C. Fisher
- Department of Chemical Engineering and Biotechnology
- University of Cambridge
- Cambridge
- UK
| | - Jay D. Wadhawan
- School of Engineering
- University of Hull
- Hull
- UK
- Department of Chemistry
| | | | | | - Nathan S. Lawrence
- School of Engineering
- University of Hull
- Hull
- UK
- Schlumberger Gould Research Center
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25
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Ribeiro FWP, Moraes FC, Pereira EC, Marken F, Mascaro LH. New application for the BiVO4 photoanode: A photoelectroanalytical sensor for nitrite. Electrochem commun 2015. [DOI: 10.1016/j.elecom.2015.09.022] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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26
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Kung CW, Chang TH, Chou LY, Hupp JT, Farha OK, Ho KC. Porphyrin-based metal–organic framework thin films for electrochemical nitrite detection. Electrochem commun 2015. [DOI: 10.1016/j.elecom.2015.06.003] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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27
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Unnikrishnan B, Wei SC, Chiu WJ, Cang J, Hsu PH, Huang CC. Nitrite ion-induced fluorescence quenching of luminescent BSA-Au(25) nanoclusters: mechanism and application. Analyst 2015; 139:2221-8. [PMID: 24634911 DOI: 10.1039/c3an02291a] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Fluorescence quenching is an interesting phenomenon which is highly useful in developing fluorescence based sensors. A thorough understanding of the fluorescence quenching mechanism is essential to develop efficient sensors. In this work, we investigate different aspects governing the nitrite ion-induced fluorescence quenching of luminescent bovine serum albumin stabilized gold nanoclusters (BSA-Au NCs) and their application for detection of nitrite in urine. The probable events leading to photoluminescence (PL) quenching by nitrite ions were discussed on the basis of the results obtained from ultraviolet-visible (UV-Vis) absorption spectroscopy, X-ray photoelectron spectroscopy (XPS), fluorescence measurements, circular dichroism (CD) spectroscopy, zeta potential and dynamic light scattering (DLS) studies. These studies suggested that PL quenching mainly occurred through the oxidation of Au(0) atoms to Au(i) atoms in the core of BSA-Au NCs mediated by nitrite ions. The interference caused by certain species such as Hg(2+), Cu(2+), CN(-), S(2-), glutathione, cysteine, etc. during the nitrite determination by fluorescence quenching was eliminated by using masking agents and optimising the conditions. Based on these findings we proposed a BSA-Au NC-modified membrane based sensor which would be more convenient for the real life applications such as nitrite detection in urine samples. The BSA-Au NC-modified nitrocellulose membrane (NCM) enabled the detection of nitrite at a level as low as 100 nM in aqueous solutions. This Au NC-based paper probe was validated to exhibit good performance for nitrite analysis in environmental water and urine samples, which makes it useful in practical applications.
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Affiliation(s)
- Binesh Unnikrishnan
- Institute of Bioscience and Biotechnology, National Taiwan Ocean University, 20224, Keelung, Taiwan.
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28
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Brainina KZ, Galperin LG, Bukharinova MA, Stozhko NY. Mathematical modeling and experimental study of electrode processes. J Solid State Electrochem 2015. [DOI: 10.1007/s10008-014-2642-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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29
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Nitrite/nitrate detection in serum based on dual-plate generator–collector currents in a microtrench. Talanta 2015; 131:228-35. [DOI: 10.1016/j.talanta.2014.07.084] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 07/23/2014] [Accepted: 07/27/2014] [Indexed: 11/22/2022]
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30
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Li T, Li Y, Zhang Y, Dong C, Shen Z, Wu A. A colorimetric nitrite detection system with excellent selectivity and high sensitivity based on Ag@Au nanoparticles. Analyst 2015; 140:1076-81. [DOI: 10.1039/c4an01583e] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
NO2− could be directly detected with high sensitivity and excellent selectivity by visualizing the color change of a dispersion of Ag@AuNPs with the unaided eye.
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Affiliation(s)
- Tianhua Li
- Key Laboratory of Magnetic Materials and Devices
- & Division of Functional Materials and Nano Devices
- Ningbo Institute of Materials Technology & Engineering
- Chinese Academy of Sciences
- Ningbo
| | - Yonglong Li
- Key Laboratory of Magnetic Materials and Devices
- & Division of Functional Materials and Nano Devices
- Ningbo Institute of Materials Technology & Engineering
- Chinese Academy of Sciences
- Ningbo
| | - Yujie Zhang
- Key Laboratory of Magnetic Materials and Devices
- & Division of Functional Materials and Nano Devices
- Ningbo Institute of Materials Technology & Engineering
- Chinese Academy of Sciences
- Ningbo
| | - Chen Dong
- Key Laboratory of Magnetic Materials and Devices
- & Division of Functional Materials and Nano Devices
- Ningbo Institute of Materials Technology & Engineering
- Chinese Academy of Sciences
- Ningbo
| | - Zheyu Shen
- Key Laboratory of Magnetic Materials and Devices
- & Division of Functional Materials and Nano Devices
- Ningbo Institute of Materials Technology & Engineering
- Chinese Academy of Sciences
- Ningbo
| | - Aiguo Wu
- Key Laboratory of Magnetic Materials and Devices
- & Division of Functional Materials and Nano Devices
- Ningbo Institute of Materials Technology & Engineering
- Chinese Academy of Sciences
- Ningbo
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31
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Click chemistry modification of glassy carbon electrode with gold nanoparticles for electroactive ion discrimination. Electrochem commun 2014. [DOI: 10.1016/j.elecom.2014.08.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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32
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Chen WY, Huang CC, Chen LY, Chang HT. Self-assembly of hybridized ligands on gold nanodots: tunable photoluminescence and sensing of nitrite. NANOSCALE 2014; 6:11078-83. [PMID: 25154909 DOI: 10.1039/c4nr02817a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Highly photoluminescent gold nanodots (Au NDs) via etching and co-deposition of hybridized ligands [11-mercaptoundecanol (11-MU) and its complexes with amphiphilic ligands] on gold nanoparticles (∼3 nm) have been prepared and employed for the detection of nitrite based on the analyte-induced photoluminescence quenching.
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Affiliation(s)
- Wei-Yu Chen
- Department of Chemistry, National Taiwan University, 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan.
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33
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Rodriguez P, Plana D, Fermin DJ, Koper MT. New insights into the catalytic activity of gold nanoparticles for CO oxidation in electrochemical media. J Catal 2014. [DOI: 10.1016/j.jcat.2013.11.020] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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34
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Ning D, Zhang H, Zheng J. Electrochemical sensor for sensitive determination of nitrite based on the PAMAM dendrimer-stabilized silver nanoparticles. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2013.12.011] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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35
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Buda M. On calculating reorganization energies for electrochemical reactions using density functional theory and continuum solvation models. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.09.045] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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36
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Kim Y, Shanmugam S. Polyoxometalate-reduced graphene oxide hybrid catalyst: synthesis, structure, and electrochemical properties. ACS APPLIED MATERIALS & INTERFACES 2013; 5:12197-12204. [PMID: 24168268 DOI: 10.1021/am4043245] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The deposition of polyoxometalate (POM) on chemically reduced graphene oxide sheets was carried out through electron transfer interaction and electrostatic interaction between POM and graphene sheets to make a heterogeneous catalyst in aqueous media. Well dispersed individual phosphomolybdic acid (PMo) clusters were observed by electron microscopy and atomic force microscopy measurements. The interaction between polyoxometalate and the graphene sheet was confirmed by using various spectroscopic methods such as FT-IR, UV-vis, and Raman. The UV-visible, IR, and cyclic voltammetry results revealed alteration of the electronic structure of deposited PMo as a result of strong interaction with the graphene oxide surface. Electrochemical properties of the PMo-rGO catalyst were investigated in an aqueous acidic electrolyte. The hybrid catalyst showed enhanced electro-oxidation of nitrite compared with pure homogeneous PMo and rGO.
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Affiliation(s)
- Yong Kim
- Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST) , Daegu 711-817, Korea
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37
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Jiang J, Wang X, Zhang L. Nanoporous gold microelectrode prepared from potential modulated electrochemical alloying–dealloying in ionic liquid. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.07.196] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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38
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Mirceski V, Gulaboski R, Lovric M, Bogeski I, Kappl R, Hoth M. Square-Wave Voltammetry: A Review on the Recent Progress. ELECTROANAL 2013. [DOI: 10.1002/elan.201300369] [Citation(s) in RCA: 134] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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39
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Jiang J, Wang X, Zhang L. Nano-Roughening a Pt Disk Microelectrode via Electrochemical Alloying-Dealloying in Ionic Liquid Electrolyte. ELECTROANAL 2013. [DOI: 10.1002/elan.201300177] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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40
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Mirceski V, Laborda E, Guziejewski D, Compton RG. New approach to electrode kinetic measurements in square-wave voltammetry: amplitude-based quasireversible maximum. Anal Chem 2013; 85:5586-94. [PMID: 23642036 DOI: 10.1021/ac4008573] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The influence of the potential pulse height of square-wave voltammetry (SWV) (i.e., the SW amplitude) is studied for a variety of quasireversible electrode mechanisms, including a simple solution-phase electrode reaction at a planar or spherical electrode, a solution phase electrode reaction coupled with a reversible follow-up chemical reaction, and a diffusionless surface confined electrode reaction. The electrode kinetics of all the electrode mechanisms depends critically on the SW amplitude, and the quasireversible kinetic region is a function of both frequency-related electrode kinetic parameters and the SW amplitude. Thus, a novel methodology for electrode kinetics measurements is proposed by altering the SW amplitude only, at a fixed frequency of the SW potential modulation, that is, at a constant scan rate of the voltammetric experiment. Electrode kinetic measurements at a constant SW frequency are of exceptional importance especially when complex electrode mechanisms are studied, which depend on several frequency-related kinetic parameters. The electrode kinetic measurements are based on a novel feature termed the "amplitude-based quasireversible maximum", manifested as a parabolic dependence of the amplitude-normalized net SW peak current versus the SW amplitude. The position of the amplitude-based quasireversible maximum depends on the standard rate constant of the electrode reaction, enabling estimation of this important kinetic parameter in a simple and fast procedure. The novel quasireversible maximum is attributed to all studied electrode mechanisms, implying that it is a general feature of most electrode mechanisms under conditions of SWV.
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Affiliation(s)
- Valentin Mirceski
- Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss Cyril and Methodius University, P.O. Box 162, 1000 Skopje, Republic of Macedonia.
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41
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Wang Y, Ward KR, Laborda E, Salter C, Crossley A, Jacobs RMJ, Compton RG. A joint experimental and computational search for authentic nano-electrocatalytic effects: electrooxidation of nitrite and L-ascorbate on gold nanoparticle-modified glassy carbon electrodes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:478-86. [PMID: 23124890 DOI: 10.1002/smll.201201670] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Indexed: 05/24/2023]
Abstract
The investigation of electrocatalytic nanoeffects is tackled via joint electrochemical measurements and computational simulations. The cyclic voltammetry of electrodes modified with metal nanoparticles is modeled considering the kinetics of the electrochemical process on the bulk materials of the different regions of the electrode, that is, the substrate (glassy carbon) and the nanoparticles (gold). Comparison of experimental and theoretical results enables the detection of changes in the electrode kinetics at the nanoscale due to structural and/or electronic effects. This approach is applied to the experimental assessment of electrocatalytic effects by gold nanoparticles (Au NPs) in the electrooxidation of nitrite and L-ascorbate. Glassy carbon electrode is modified with Au NPs via seed-mediated growth method. Divergence between the kinetics of these processes on gold macroelectrodes and gold nanoparticles is examined. Whereas claimed catalytic effects are not observed in the electrooxidation of nitrite, electrocatalytic nanoeffects are verified in the case of L-ascorbate. This is probably due to that the electron transfer process follows an adsorptive mechanism. The combination of simulation with experiments is commended as a general strategy of authentification, or not, of nanoelectrocatalytic effects.
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Affiliation(s)
- Ying Wang
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, Oxford, UK
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