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Devi B, Bhardwaj A, Gambhir D, Roy B, Karmakar A, Dey G, Jain A, Mondal B, Koner RR. Cu(II)-Based Coordination Polymer as a Pristine Form Usable Electrocatalyst for Oxygen Reduction Reaction: Experimental Evaluation and Theoretical Insights into Biomimetic Mechanistic Aspects. Inorg Chem 2022; 61:15699-15710. [PMID: 36123194 DOI: 10.1021/acs.inorgchem.2c02755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
As the postsynthesis-processed metal-organic material-based catalysts for energy applications add additional cost to the whole process, the importance of developing synthesized usable pristine catalysts is quite evident. The present work reports a new Cu-based coordination polymer (Cu-CP) catalyst to be used in its pristine form for oxygen reduction reaction (ORR) application. The catalyst was characterized using single-crystal X-ray diffraction, field emission scanning electron microscopy, and X-ray photoemission spectroscopy. The Cu-CP exhibits admirable electrocatalytic ORR activity with an onset potential of 0.84 V versus RHE and a half wave potential of 0.69 V versus RHE. As revealed by the density functional theory-based computational mechanistic investigation of the electrocatalytic ORR process, the electrochemically reduced Cu(I) center binds to the molecular O2 through an exergonic process (ΔG = -6.8 kcal/mol) and generates the Cu(II)-O2•- superoxo intermediate. Such superoxo intermediates are frequently encountered in the catalytic cycle of the Cu-containing metalloenzymes in their O2 reduction reaction. This intermediate undergoes coupled proton and electron transfer processes to give OH- in an alkaline medium involving H2O2 as the intermediate. The electrocatalytic performance of Cu-CP remained stable even up to 3000 cycles. Overall, the newly developed Cu-CP-based electrocatalyst holds promising potential for efficient biomimetic ORR reactivity, which opens new possibilities toward the development of robust coordination polymer-based electrocatalysts.
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Affiliation(s)
- Bandhana Devi
- School of Mechanical & Materials Engineering, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh 175005, India
| | - Akhil Bhardwaj
- School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh 175005, India
| | - Diksha Gambhir
- School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh 175005, India
| | - Biswajit Roy
- School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh 175005, India
| | - Anirban Karmakar
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Lisbon 1049-001, Portugal
| | - Gourab Dey
- School of Mechanical & Materials Engineering, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh 175005, India
| | - Anuj Jain
- School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh 175005, India
| | - Bhaskar Mondal
- School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh 175005, India
| | - Rik Rani Koner
- School of Mechanical & Materials Engineering, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh 175005, India
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Zhang T, Li Z, Wang L, Zhang S, Liu Y, Niu X. Highly Exposed Active Sites of Fe/N Co-doped Defect-rich Graphene as an Efficient Electrocatalyst for Oxygen Reduction Reaction. Chem Asian J 2020; 15:3527-3534. [PMID: 32964661 DOI: 10.1002/asia.202000903] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/06/2020] [Indexed: 11/09/2022]
Abstract
A defect-rich interconnected hierarchical three-dimensional Fe and N co-doped graphene has been prepared by a facile synthesis with poly (2,5-benzimidazole) (ABPBI) as nitrogen and carbon sources and CaCO3 as the template. ABPBI possesses abundant nitrogen, and pyrolysis of ABPBI is helpful to form graphene structure. CaCO3 and its decomposition products CO2 can promote the formation of interconnected hierarchical porous three-dimensional graphene, which possesses more defects and exposed active sites. Benefiting from the defective catalysis mechanism, rich defect catalysts are applied as electrode materials to enhance the catalytic performance for oxygen reduction reaction (ORR). Electrochemically, the half-wave potential (E1/2 ) of Fe-3D-NG#800 is 0.84 V (vs. RHE), and the accelerated durability tests shows the E1/2 of Fe-3D-NG#800 shifted by a 21 mV drop after cyclic voltammetry scanning for 5000 cycles. Therefore, Fe-3D-NG#800 has excellent activity and durability than 20 wt % Pt/C.
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Affiliation(s)
- Tingwei Zhang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, P. R. China.,School of Chemistry and Life Science, Anshan Normal University, Anshan, 114007, P. R. China
| | - Zhongfang Li
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, P. R. China
| | - Likai Wang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, P. R. China
| | - Shenzhi Zhang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, P. R. China
| | - Yuepeng Liu
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, P. R. China
| | - Xueliang Niu
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, P. R. China
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Chowdhury SN, Biswas S, Das P, Paul S, Biswas AN. Oxygen Reduction Assisted by the Concert of Redox Activity and Proton Relay in a Cu(II) Complex. Inorg Chem 2020; 59:14012-14022. [PMID: 32916051 DOI: 10.1021/acs.inorgchem.0c01776] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
A copper complex, [Cu(dpaq)](ClO4) (1), of a monoanionic pentadentate amidate ligand (dpaq) has been isolated and characterized to study its efficacy toward electrocatalytic reduction of oxygen in neutral aqueous medium. The Cu(II) mononuclear complex, poised in a distorted trigonal bipyramidal structure, reduces oxygen at an onset potential of 0.50 V vs RHE. Kinetics study by hydrodynamic voltammetry and chronoamperometry suggests a stepwise mechanism for sequential reduction of O2 to H2O2 to H2O at a single-site Cu-catalyst. The foot-of-the-wave analysis records a turnover frequency of 5.65 × 102 s-1. At pH 7.0, complex 1 undergoes a quasi-reversible mixed metal-ligand-based reduction and triggers the reduction of dioxygen to water. Electrochemical studies in tandem with quantum chemical investigation, conducted at different redox states, portray the active participation of ligand in completing the process of proton-coupled electron transfer internally. The protonated carboxamido moiety acts as a proton relay, while the quinoline-based orbital supplies the necessary redox equivalent for the conversion of complex 1 to Cu(II)-hydroperoxo species. Thus, a suitable combination of redox non-innocence and proton shuttling functionality in the ligand makes it an effective electron-proton-transfer mediator and subsequently assists the process of oxygen reduction.
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Affiliation(s)
- Srijan Narayan Chowdhury
- Department of Chemistry, National Institute of Technology Sikkim, Barfung Block, Ravangla, South Sikkim 737139, India
| | - Sachidulal Biswas
- Department of Chemistry, National Institute of Technology Sikkim, Barfung Block, Ravangla, South Sikkim 737139, India
| | - Purak Das
- Department of Chemistry, Rishi Bankim Chandra College for Women, Naihati 743165, India
| | - Satadal Paul
- Department of Science and Humanities, Darjeeling Polytechnic, Kurseong 734203, India
| | - Achintesh N Biswas
- Department of Chemistry, National Institute of Technology Sikkim, Barfung Block, Ravangla, South Sikkim 737139, India
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