Highly selective oxygen reduction to H2O2 on π-d conjugated coordination polymers: The effect of coordination atoms

Zhang, Beiping; Han, Bin; Guan, Chaoting; Guo, Qin; Luo, Yu; Jiang, Jin

doi:10.1016/j.cej.2023.141688

Cited by 8 publications

(4 citation statements)

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“…71 The different coordination types ( e.g. , Cu–N 2 , 123 Co–N 2 O 2 , 29 Ni–O 4 , 122 Ni–O 2 N 2 , 124 and Co–N 5 119 ) affect the electronic structure of the active centres and regulate their intrinsic ORR activity. Lian et al reported a series of MOFs with HITP as a ligand and different ratios of Ni to Co to study their ORR.…”

Section: Organic Polymers As Emerging Electrocatalystsmentioning

confidence: 99%

Engineering organic polymers as emerging sustainable materials for powerful electrocatalysts

Cui,

Wu,

Liu

et al. 2024

Chem. Soc. Rev.

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Section: Organic Polymers As Emerging Electrocatalystsmentioning

confidence: 99%

Engineering organic polymers as emerging sustainable materials for powerful electrocatalysts

Cui,

Wu,

Liu

et al. 2024

Chem. Soc. Rev.

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“…Previous studies widely reported that H 2 O 2 was formed from electrolysis of O 2 during electrochemical processes. 39,40 So, the effect of O 2 might be associated with the formation of H 2 O 2 , which thus impacted the transformation of Mn(VII). To explore the role of O 2 in the E-Mn(VII) process, the H 2 O 2 production at various pH values was investigated.…”

Section: Mn Transformation and H 2 O 2 Formation In E-mentioning

confidence: 99%

Enhanced Degradation of Diclofenac by Electro-Activated Permanganate: A Critical Role of In Situ Formed H₂O₂

Zhang,

Guan,

Guo

et al. 2023

ACS EST Eng.

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Electrochemical technologies and permanganate oxidation are two attractive strategies in water treatment due to their low cost, easy operation, good adaptability, and environmental friendliness. Interestingly, recent studies have demonstrated that the combination of electrolysis and Mn(VII) (E-Mn(VII) process) shows a synergetic effect on organic contaminants degradation. However, the underlying mechanism of the E-Mn(VII) process remains unclear. In this study, the enhanced removal of diclofenac (DCF) by the E-Mn(VII) process was also demonstrated, and the main reactive species were reidentified. It was found that H 2 O 2 was considerably formed via the reduction of O 2 on the cathode, and it played a key role in facilitating Mn(VII) transformation into MnO 2 . Increasing O 2 concentration, working potential, and pH value were conducive to H 2 O 2 formation as well as Mn(VII) transformation to MnO 2 . Higher Mn(VII) dosages did not impact H 2 O 2 formation but also led to faster MnO 2 formation. The enhanced formation of MnO 2 was favorable for the fast degradation of DCF in the E-Mn(VII) process owing to the catalytic effect of MnO 2 on Mn(VII) oxidation. This was confirmed by the observation that (i) the E-Mn(VII) process showed a similar pH-dependent oxidation trend to that of MnO 2 catalytic oxidation of Mn(VII) (i.e., the reactivity was much stronger at lower pH); and (ii) the addition of MnO 2 prepared ex situ had a significant enhancing effect on DCF oxidation by the E-Mn(VII) process. Moreover, the possible contribution of reactive manganese intermediates such as soluble free Mn(III), Mn(VI), and Mn(V) was ruled out by the results of the probe experiments, UV−visible spectrophotometry, and examining the reactivity of Mn(III) complexes prepared ex situ. Also, the results of radical scavenging experiments indicated the negligible contribution of HO•. Furthermore, for the practical application of the E-Mn(VII) process in water decontamination, suitable operating parameters (e.g., a moderate potential and relatively lower pH) should be determined to avoid the fast loss of Mn(VII) and the electrical energy consumption. Overall, this work brings new insights into the reaction mechanism of the E-Mn(VII) process as well as proposes an efficient, sustainable, and feasible strategy for water and wastewater treatment.

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“…H 2 O 2 is a valuable chemical compound widely used in various industries, including water treatment, and pharmaceuticals . The fast development in this field has shown that H 2 O 2 production can be promoted on several types of semiconductor photocatalysts, based on titanium dioxide (TiO 2 ), molybdenum disulfide (MoS 2 ), graphitic carbon nitride (g-C 3 N 4 ), metal–organic frameworks, coordination polymers, , resorcinol-formaldehyde resins, etc. It is crucial to comprehend the interaction between molecular oxygen and semiconductor surfaces, particularly how the surface properties of semiconductors influence the initial step of the molecular oxygen activation process.…”

Section: Introductionmentioning

confidence: 99%

Solar Light-Driven Molecular Oxygen Activation by BiOCl Nanosheets: Synergy of Coexposed {001}, {110} Facets and Oxygen Vacancies

Ali,

Sarkar,

Patra

2024

ACS Appl. Mater. Interfaces

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Single-crystalline BiOCl nanosheets with coexposed {001} and {110} facets, as well as oxygen vacancies, were synthesized using a simple method. These nanosheets have the ability to activate molecular oxygen, producing reactive superoxide radicals (77.8%) and singlet oxygen (22.2%) when exposed to solar light. The BiOCl demonstrated excellent photocatalytic efficiency in producing H 2 O 2 under simulated solar light and in oxidatively hydroxylating phenylboronic acid under blue LED light. Our research highlights the significance of constructing coexposed {001} and {110} facets, as well as oxygen vacancies, in enhancing photocatalytic performance. The BiOCl nanosheets have the capability to produce H 2 O 2 with a solar-to-chemical energy conversion efficiency of 0.11%.

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Highly selective oxygen reduction to H2O2 on π-d conjugated coordination polymers: The effect of coordination atoms

Cited by 8 publications

References 58 publications

Engineering organic polymers as emerging sustainable materials for powerful electrocatalysts

Engineering organic polymers as emerging sustainable materials for powerful electrocatalysts

Enhanced Degradation of Diclofenac by Electro-Activated Permanganate: A Critical Role of In Situ Formed H₂O₂

Solar Light-Driven Molecular Oxygen Activation by BiOCl Nanosheets: Synergy of Coexposed {001}, {110} Facets and Oxygen Vacancies

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Highly selective oxygen reduction to H2O2 on π-d conjugated coordination polymers: The effect of coordination atoms

Cited by 8 publications

References 58 publications

Engineering organic polymers as emerging sustainable materials for powerful electrocatalysts

Engineering organic polymers as emerging sustainable materials for powerful electrocatalysts

Enhanced Degradation of Diclofenac by Electro-Activated Permanganate: A Critical Role of In Situ Formed H2O2

Solar Light-Driven Molecular Oxygen Activation by BiOCl Nanosheets: Synergy of Coexposed {001}, {110} Facets and Oxygen Vacancies

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Enhanced Degradation of Diclofenac by Electro-Activated Permanganate: A Critical Role of In Situ Formed H₂O₂