Noncovalent immobilization of Co(<scp>ii</scp>)porphyrin through axial coordination as an enhanced electrocatalyst on carbon electrodes for oxygen reduction and evolution

Attatsi, Isaac Kwaku; Zhu, Weihua; Xu, Ling

doi:10.1039/c9nj02408e

Cited by 12 publications

(8 citation statements)

References 48 publications

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“…The reactions of NHS-substituted organic compounds with amines are widely presented in the chemical literature, these reactions can be conducted under various conditions using both organic solvents and water media. Among known methods, we chose reactions in CH 2 Cl 2 [ 65 , 69 ] and in water [ 66 , 67 ]. Other common solvents, DMF and DMSO, in our view, are less applicable for polymer modification owing to the complexity of the further removal of these solvents.…”

Section: Resultsmentioning

confidence: 99%

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Functionalized Biodegradable Polymers via Termination of Ring-Opening Polymerization by Acyl Chlorides

et al. 2021

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Aliphatic polyesters are an important class of polymeric materials for biomedical applications due to their versatile and tunable chemistry, biocompatibility and biodegradability. A capability of direct bonding with biomedically significant molecules, provided by the presence of the reactive end functional groups (FGs), is highly desirable for prospective polymers. Among FGs, N-hydroxysuccinimidyl activated ester group (NHS) and maleimide fragment (MI) provide efficient covalent bonding with –NH– and –SH containing compounds. In our study, we found that NHS- and MI-derived acyl chlorides efficiently terminate living ring-opening polymerization of ε-caprolactone, L-lactide, ethyl ethylene phosphonate and ethyl ethylene phosphate, catalyzed by 2,6-di-tert-butyl-4-methylphenoxy magnesium complex, with a formation of NHS- and MI-functionalized polymers at a high yields. Reactivity of these polymers towards amine- and thiol-containing model substrates in organic and aqueous media was also studied.

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Section: Resultsmentioning

confidence: 99%

“…According to previously reported procedure [ 68 , 69 ], MI-functionalized polymer (200 mg) was dissolved in CH 2 Cl 2 (2 mL) and treated with HSCH 2 COOMe and Et 3 N (2 and 4 eqs., respectively, relative to amount of MI groups in the polymer). After 6 h at RT, CH 2 Cl 2 (8 mL) was added, organic phase was washed by 1M aq.…”

Section: Methodsmentioning

confidence: 99%

Functionalized Biodegradable Polymers via Termination of Ring-Opening Polymerization by Acyl Chlorides

et al. 2021

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“…CoTPP was noncovalently immobilized onto the surface of MWCNT via a pyrene–pyridine (Py-Py) linker [ 90 ] and the electrocatalytic activities of CoTPP/MWCNT/Py–Py for OER and ORR were better than those of CoTPP/MWCNT, indicating the positive effect of Py-Py linker. Cao and Wang et al compared the catalytic performances of CoTPP and Co-P (for structure, see Figure 14 ) with electron-withdrawing substituents [ 91 ].…”

Section: Porphyrin-based Systems As Bifunctional Oxygen Electrocataly...mentioning

confidence: 99%

“… Catalysts OER a ORR a Zn–air Battery d Ref. Electrolyte η 10 (mV) Tafel Slope (mV·dec −1 ) Electrolyte E 1/2 (V) Tafel Slope (mV·dec −1 ) Voltage Gap ∆ E (V) Peak Power Density (mW/cm −2 ) CoTPP/MWCNT/Py–Py 1.0 M KOH 440 — 0.5 M H 2 SO 4 0.375 b — — — [ 90 ] CoTPP/CNTs 1.0 M KOH 407 60.3 0.1 M KOH 0.81 36.9 — 155.7 [ 91 ] Co-P/CNTs 1.0 M KOH 480 71.6 0.1 M KOH 0.76 43.5 — 84.5 …”

Section: Porphyrin-based Systems As Bifunctional Oxygen Electrocataly...mentioning

confidence: 99%

Recent Advances in Porphyrin-Based Systems for Electrochemical Oxygen Evolution Reaction

Yao

Wang

et al. 2022

IJMS

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Oxygen evolution reaction (OER) plays a pivotal role in the development of renewable energy methods, such as water-splitting devices and the use of Zn–air batteries. First-row transition metal complexes are promising catalyst candidates due to their excellent electrocatalytic performance, rich abundance, and cheap price. Metalloporphyrins are a class of representative high-efficiency complex catalysts owing to their structural and functional characteristics. However, OER based on porphyrin systems previously have been paid little attention in comparison to the well-described oxygen reduction reaction (ORR), hydrogen evolution reaction, and CO2 reduction reaction. Recently, porphyrin-based systems, including both small molecules and porous polymers for electrochemical OER, are emerging. Accordingly, this review summarizes the recent advances of porphyrin-based systems for electrochemical OER. Firstly, the electrochemical OER for water oxidation is discussed, which shows various methodologies to achieve catalysis from homogeneous to heterogeneous processes. Subsequently, the porphyrin-based catalytic systems for bifunctional oxygen electrocatalysis including both OER and ORR are demonstrated. Finally, the future development of porphyrin-based catalytic systems for electrochemical OER is briefly prospected.

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“…In view of the climate crisis, the photochemical or electrochemical conversion of CO 2 and H 2 O into energy-rich fuel products such as methanol [ 30 , 32 , 33 ] or dihydrogen (H 2 ) [ 45 , 46 , 47 ] are important goals, and cobalt porphyrin complexes have been studied as catalysts for the CO 2 reduction [ 30 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 44 ] and the H 2 evolution [ 18 , 41 , 42 , 48 ], besides other important redox processes such as O 2 reduction [ 19 , 23 , 49 , 50 , 51 , 52 , 53 , 54 ], O 2 evolution reaction (OER) [ 49 , 55 ], and interesting organic redox transformations [ 56 , 57 , 58 , 59 , 60 ].…”

Section: Introductionmentioning

confidence: 99%

CO2 to CO Electroreduction, Electrocatalytic H2 Evolution, and Catalytic Degradation of Organic Dyes Using a Co(II) meso-Tetraarylporphyrin

et al. 2022

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The meso-tetrakis(4-(trifluoromethyl)phenyl)porphyrinato cobalt(II) complex [Co(TMFPP)] was synthesised in 93% yield. The compound was studied by 1H NMR, UV-visible absorption, and photoluminescence spectroscopy. The optical band gap Eg was calculated to 2.15 eV using the Tauc plot method and a semiconducting character is suggested. Cyclic voltammetry showed two fully reversible reduction waves at E1/2 = −0.91 V and E1/2 = −2.05 V vs. SCE and reversible oxidations at 0.30 V and 0.98 V representing both metal-centred (Co(0)/Co(I)/Co(II)/Co(III)) and porphyrin-centred (Por2−/Por−) processes. [Co(TMFPP)] is a very active catalyst for the electrochemical formation of H2 from DMF/acetic acid, with a Faradaic Efficiency (FE) of 85%, and also catalysed the reduction of CO2 to CO with a FE of 90%. Moreover, the two triarylmethane dyes crystal violet and malachite green were decomposed using H2O2 and [Co(TMFPP)] as catalyst with an efficiency of more than 85% in one batch.

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Noncovalent immobilization of Co(ii)porphyrin through axial coordination as an enhanced electrocatalyst on carbon electrodes for oxygen reduction and evolution

Abstract: Noncovalent immobilization of Co(ii)porphyrin on carbon nanotubes through axial coordination provides significantly enhanced electrochemically catalyzed oxygen reduction and oxygen evolution.

Cited by 12 publications

References 48 publications

Functionalized Biodegradable Polymers via Termination of Ring-Opening Polymerization by Acyl Chlorides

Functionalized Biodegradable Polymers via Termination of Ring-Opening Polymerization by Acyl Chlorides

Recent Advances in Porphyrin-Based Systems for Electrochemical Oxygen Evolution Reaction

CO2 to CO Electroreduction, Electrocatalytic H2 Evolution, and Catalytic Degradation of Organic Dyes Using a Co(II) meso-Tetraarylporphyrin

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