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Wang SM, Zhou S, Han SG, Ma DD, Wei W, Zhu QL. Improving CO 2 electroconversion by customizing the hydroxyl microenvironment around a semi-open Co-N 2O 2 configuration. J Colloid Interface Sci 2024; 678:630-638. [PMID: 39265335 DOI: 10.1016/j.jcis.2024.09.055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2024] [Revised: 08/25/2024] [Accepted: 09/04/2024] [Indexed: 09/14/2024]
Abstract
Constructing local microenvironments is one of the important strategies to improve the electrocatalytic performances, such as in electrochemical CO2 reduction (ECR). However, effectively customizing these microenvironments remains a significant challenge. Herein, utilizing carbon nanotube (CNT) heterostructured semi-open Co-N2O2 catalytic configurations (Co-salophen), we have demonstrated the role of the local microenvironment on promoting ECR through regulating the location of hydroxyl groups. Concretely, compared with the maximum Faradaic efficiency (FE) of 62% for carbon monoxide (CO) presented by Co-salophen/CNT without a hydroxyl microenvironment, the designed Co-salophen-OH3/CNT, featuring hydroxyl groups at the Co-N2O2 structural opening, shows remarkable CO2-to-CO electroreduction activity across a wide potential window, with the FE of CO up to 95%. In particular, through the deuterium kinetic isotope experiments and theoretical calculations, we decoded that the hydroxyl groups act as a proton relay station, promoting the efficient transfer of protons to the Co-N2O2 active sites. The finding demonstrates a promising molecular design strategy for enhancing electrocatalysis.
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Affiliation(s)
- San-Mei Wang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS), Fuzhou 350108, China
| | - Shenghua Zhou
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS), Fuzhou 350108, China
| | - Shu-Guo Han
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS), Fuzhou 350108, China; Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China
| | - Dong-Dong Ma
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS), Fuzhou 350108, China; Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China.
| | - Wenbo Wei
- School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China.
| | - Qi-Long Zhu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS), Fuzhou 350108, China; School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Ngounoue Kamga FA, Hrubaru MM, Enache O, Diacu E, Draghici C, Tecuceanu V, Ungureanu EM, Nkemone S, Ndifon PT. Ni(II)-Salophen-Comprehensive Analysis on Electrochemical and Spectral Characterization and Biological Studies. Molecules 2023; 28:5464. [PMID: 37513334 PMCID: PMC10384438 DOI: 10.3390/molecules28145464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 07/03/2023] [Accepted: 07/12/2023] [Indexed: 07/30/2023] Open
Abstract
New aspects of the Ni(II)-salophen complex and salophen ligand precursor were found during deep electrochemical and optical characterization, as well as biological studies for new pharmacological applications. Physicochemical and spectroscopic methods (1H- and 13C-NMR, FT-IR and UV-Vis, electrospray ionization mass spectroscopy, thermogravimetric analysis, and molar conductance measurements) were also used to prove that the salophen ligand acts as a tetradentate and coordinates to the central metal through nitrogen and oxygen atoms. The electrochemical behavior of the free Schiff salophen ligand (H2L) and its Ni(II) complex (Ni(II)L) was deeply studied in tetrabutylammonium perchlorate solutions in acetonitrile via CV, DPV, and RDE. Blue films on the surfaces of the electrodes as a result of the electropolymerization processes were put in evidence and characterized via CV and DPV. (H2L) and Ni(II)L complexes were tested for their antimicrobial, antifungal, and antioxidant activity, showing good antimicrobial and antifungal activity against several bacteria and fungi.
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Affiliation(s)
- Francis Aurelien Ngounoue Kamga
- Coordination Chemistry Laboratory, Department of Inorganic Chemistry, Faculty of Science, University of Yaounde 1, Yaounde P.O. Box 812, Cameroon
- Faculty of Chemical Engineering and Biotechnologies, University "Politehnica" of Bucharest, Gheorghe Polizu 1-7, Sector 1, 011061 Bucharest, Romania
| | - Madalina-Marina Hrubaru
- Faculty of Chemical Engineering and Biotechnologies, University "Politehnica" of Bucharest, Gheorghe Polizu 1-7, Sector 1, 011061 Bucharest, Romania
- "C. D. Nenitzescu" Institute of Organic and Supramolecular Chemistry, Romanian Academy, Sector 6, Spl. Independentei 202B, 060023 Bucharest, Romania
| | - Oana Enache
- Faculty of Chemical Engineering and Biotechnologies, University "Politehnica" of Bucharest, Gheorghe Polizu 1-7, Sector 1, 011061 Bucharest, Romania
| | - Elena Diacu
- Faculty of Chemical Engineering and Biotechnologies, University "Politehnica" of Bucharest, Gheorghe Polizu 1-7, Sector 1, 011061 Bucharest, Romania
| | - Constantin Draghici
- "C. D. Nenitzescu" Institute of Organic and Supramolecular Chemistry, Romanian Academy, Sector 6, Spl. Independentei 202B, 060023 Bucharest, Romania
| | - Victorita Tecuceanu
- "C. D. Nenitzescu" Institute of Organic and Supramolecular Chemistry, Romanian Academy, Sector 6, Spl. Independentei 202B, 060023 Bucharest, Romania
| | - Eleonora-Mihaela Ungureanu
- Faculty of Chemical Engineering and Biotechnologies, University "Politehnica" of Bucharest, Gheorghe Polizu 1-7, Sector 1, 011061 Bucharest, Romania
| | - Stephanie Nkemone
- Coordination Chemistry Laboratory, Department of Inorganic Chemistry, Faculty of Science, University of Yaounde 1, Yaounde P.O. Box 812, Cameroon
| | - Peter T Ndifon
- Coordination Chemistry Laboratory, Department of Inorganic Chemistry, Faculty of Science, University of Yaounde 1, Yaounde P.O. Box 812, Cameroon
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In-Situ EC-AFM Study of Electrochemical P-Doping of Polymeric Nickel(II) Complexes with Schiff base Ligands. INORGANICS 2023. [DOI: 10.3390/inorganics11010041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Conductive electrochemically active metallopolymers are outstanding materials for energy storage and conversion, electrocatalysis, electroanalysis, and other applications. The hybrid inorganic–organic nature of these materials ensures their rich chemistry and offers wide opportunities for fine-tuning their functional properties. The electrochemical modulation of the nanomechanical properties of metallopolymers is rarely investigated, and the correlations between the structure, stiffness, and capacitive properties of these materials have not yet been reported. We use electrochemical atomic force microscopy (EC-AFM) to perform in-situ quantitative nanomechanical measurements of two Schiff base metallopolymers, poly[NiSalphen] and its derivative that contains two methoxy substituents in the bridging phenylene diimine unit poly[NiSalphen(CH3O)2], during their polarization in the electrolyte solution to the undoped and fully doped states. We also get insight into the electrochemical p-doping of these polymers using electrochemical quartz crystal microgravimetry (EQCM) coupled with cyclic voltammetry (CV). Combined findings for the structurally similar polymers with different interchain interactions led us to propose a correlation between Young’s modulus of the material, its maximum doping level, and ion and solvent fluxes in the polymer films upon electrochemical oxidation.
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Kargar H, Ashfaq M, Fallah-Mehrjardi M, Behjatmanesh-Ardakani R, Munawar KS, Tahir MN. Unsymmetrical Ni(II) Schiff base complex: Synthesis, spectral characterization, crystal structure analysis, Hirshfeld surface investigation, theoretical studies, and antibacterial activity. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133381] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Zhang YC, Chilukuri B, Hanson TB, Heiden ZM, Lee DY. Connecting Solution-Phase to Single-Molecule Properties of Ni(Salophen). J Phys Chem Lett 2019; 10:3525-3530. [PMID: 31188610 DOI: 10.1021/acs.jpclett.9b01381] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We present a strong correlation of the Ni(salophen) structure and properties measured in single-molecule vs bulk quantities and in ultra high vacuum vs solution phase. Under a scanning tunneling microscope (STM), Ni(salophen) forms a self-assembled monolayer (SAM) on Au(111) at 23 °C with molecular structure identical to that of the X-ray crystallographic measurement. The HOMO and LUMO levels are determined using elastic tunneling spectroscopy at the single-molecule level with confirmation by monolayer-quantity ultraviolet photoelectron spectroscopy (UPS) and by cyclic voltammetry (CV) measurements. The STM-determined HOMO-LUMO gap of 3.28 eV and (HOMO-1)-HOMO gap of 0.36 eV form a new foundation for the selection of hybrid functionals with a simple basis set to be effective in accurately calculating single-molecule Ni(salophen) frontier MO levels. Our results suggest that microscopy-based experiments on a surface, along with free-molecule gas-phase calculations, can provide useful insights into the physical properties of metal(salen) complexes, especially when such direct measurements are not available in solution.
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Affiliation(s)
- Yi C Zhang
- Department of Chemistry and Materials Science & Engineering Program , Washington State University , Pullman , Washington 99164 , United States
| | - Bhaskar Chilukuri
- Department of Chemistry , Washington State University , Pullman , Washington 99164 , United States
| | - Tanner B Hanson
- Department of Chemistry , Washington State University , Pullman , Washington 99164 , United States
| | - Zachariah M Heiden
- Department of Chemistry , Washington State University , Pullman , Washington 99164 , United States
| | - David Y Lee
- Department of Chemistry and Materials Science & Engineering Program , Washington State University , Pullman , Washington 99164 , United States
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