Oxygen reduction to hydrogen peroxide on Fe3O4 nanoparticles supported on Printex carbon and Graphene

Barros, Willyam R.P.; Wei, Qingyi; Zhang, Gaixia; Sun, Shuhui; Lanza, Marcos R.V.; Tavares, Ana C.

doi:10.1016/j.electacta.2015.02.175

Cited by 147 publications

(87 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Evidently, high selectivity around 80% was achieved with a potential range from 0.50 to 0.80 V versus RHE, indicating that ORR on the Co–POC–O electrocatalyst goes through the dominated two‐electron pathway with H 2 O 2 as the final product. Specifically, Co–POC–O affords the H 2 O 2 selectivity of 85.6% at the current density of 1.0 mA cm −2 , superior than many other reported electrocatalysts (Figure d) 9,13b,d,14b,16,28. The high ORR reactivity and high selectivity for the two‐electron process render Co–POC–O as an excellent noble‐metal‐free electrocatalyst for H 2 O 2 electrosynthesis.…”

mentioning

confidence: 86%

Electrosynthesis of Hydrogen Peroxide Synergistically Catalyzed by Atomic Co–N_x–C Sites and Oxygen Functional Groups in Noble‐Metal‐Free Electrocatalysts

et al. 2019

View full text Add to dashboard Cite

Hydrogen peroxide (H2O2) is a green oxidizer widely involved in a vast number of chemical reactions. Electrochemical reduction of oxygen to H2O2 constitutes an environmentally friendly synthetic route. However, the oxygen reduction reaction (ORR) is kinetically sluggish and undesired water serves as the main product on most electrocatalysts. Therefore, electrocatalysts with high reactivity and selectivity are highly required for H2O2 electrosynthesis. In this work, a synergistic strategy is proposed for the preparation of H2O2 electrocatalysts with high ORR reactivity and high H2O2 selectivity. A Co−Nx−C site and oxygen functional group comodified carbon‐based electrocatalyst (named as Co–POC–O) is synthesized. The Co–POC–O electrocatalyst exhibits excellent catalytic performance for H2O2 electrosynthesis in O2‐saturated 0.10 m KOH with a high selectivity over 80% as well as very high reactivity with an ORR potential at 1 mA cm−2 of 0.79 V versus the reversible hydrogen electrode (RHE). Further mechanism study identifies that the Co−Nx−C sites and oxygen functional groups contribute to the reactivity and selectivity for H2O2 electrogeneration, respectively. This work affords not only an emerging strategy to design H2O2 electrosynthesis catalysts with remarkable performance, but also the principles of rational combination of multiple active sites for green and sustainable synthesis of chemicals through electrochemical processes.

show abstract

mentioning

confidence: 86%

Electrosynthesis of Hydrogen Peroxide Synergistically Catalyzed by Atomic Co–N_x–C Sites and Oxygen Functional Groups in Noble‐Metal‐Free Electrocatalysts

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Several works have shownt hat monometallic oxides dispersed on carbon supports produce more hydrogen peroxide than Co-rich samples, and that Fe 3 O 4 /C can be an effective catalyst for hydrogen peroxide formation. [40] However, doping carbon supports with nitrogen significantly improves the ORR selectivity of monometallic Fe and Co catalysts throught he 4-electron transfer pathway to form OH À . [11,17] In our case, nitrogen-free Fe x Co 1Àx /MWCNT samples revealed high 4-electron ORR selectivity,w hichc an be attributed to as ynergetic interaction between Fe and Co, as well as optimal active site distribution.…”

Section: Bifunctional Orr/oer Activity Of the Fe X Co 1àx /Mwcnt Catamentioning

confidence: 99%

Bifunctional Oxygen Reduction/Oxygen Evolution Activity of Mixed Fe/Co Oxide Nanoparticles with Variable Fe/Co Ratios Supported on Multiwalled Carbon Nanotubes

et al. 2018

View full text Add to dashboard Cite

A facile strategy is reported for the synthesis of Fe/Co mixed metal oxide nanoparticles supported on, and embedded inside, high purity oxidized multiwalled carbon nanotubes (MWCNTs) of narrow diameter distribution as effective bifunctional catalysts able to reversibly drive the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) in alkaline solutions. Variation of the Fe/Co ratio resulted in a pronounced trend in the bifunctional ORR/OER activity. Controlled synthesis and in-depth characterization enabled the identification of an optimal Fe/Co composition, which afforded a low OER/OER reversible overvoltage of only 0.831 V, taking the OER at 10 mA cm and the ORR at -1 mA cm . Importantly, the optimal catalyst with a Fe/Co ratio of 2:3 exhibited very promising long-term stability with no evident change in the potential for both the ORR and the OER after 400 charge/discharge (OER/ORR) cycles at 15 mA cm in 6 m KOH. Moreover, detailed investigation of the structure, size, and phase composition of the mixed Fe/Co oxide nanoparticles, as well as their localization (inside of or on the surface of the MWCNTs) revealed insight of the possible contribution of the individual catalyst components and their synergistic interaction in the catalysis.

show abstract

“…Incorporation of photolabile drugs into nanocapsules was also demonstrated to improve the photostability . Recent research shows that Fe 3 O 4 nanoparticles have not only the properties of magnetic materials but also the capability of breaking down peroxide . Therefore, Fe 3 O 4 nanoparticles may also have the potential capability of protecting drugs from oxidation.…”

Section: Introductionmentioning

confidence: 99%

Preparation and evaluation of chitosan/β‐cyclodextrin magnetic nanoparticles as a photodegradable and hydrophobic drug delivery carrier

Shi

Xiang

Liu

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this study, novel tumor targeting nanocarriers comprised of chitosan (CS)/β‐cyclodextrin (β‐CD) magnetic nanoparticles were prepared to improve the photodegradable stability and bioavailability of hydrophobic drug. Resveratrol (Res) with photodegradable and hydrophobic properties was selected as a model drug. The photodegradation rate of Res in Fe3O4 nanoparticles solution was 7.8 times lower than that in the ethanol solution. In addition, the value of the saturation magnetization of CS/β‐CD nanoparticles was found to be 19.56 emu/g with characteristic of superparamagnetism. Approximately 90% Res was entrapped into the CS/β‐CD magnetic nanoparticles with the size distribution ranging from 200 to 359 nm, and the nanoparticles were spherical in shape with high zeta potentials. Furthermore, the formation of CS/β‐CD nanoparticles showed a sustained release in vitro. These results indicated that the obtained CS/β‐CD magnetic nanoparticles were a promising magnetic targeting carrier for photodegradable and hydrophobic drugs. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45076.

show abstract

Oxygen reduction to hydrogen peroxide on Fe3O4 nanoparticles supported on Printex carbon and Graphene

Cited by 147 publications

References 35 publications

Electrosynthesis of Hydrogen Peroxide Synergistically Catalyzed by Atomic Co–N_x–C Sites and Oxygen Functional Groups in Noble‐Metal‐Free Electrocatalysts

Electrosynthesis of Hydrogen Peroxide Synergistically Catalyzed by Atomic Co–N_x–C Sites and Oxygen Functional Groups in Noble‐Metal‐Free Electrocatalysts

Bifunctional Oxygen Reduction/Oxygen Evolution Activity of Mixed Fe/Co Oxide Nanoparticles with Variable Fe/Co Ratios Supported on Multiwalled Carbon Nanotubes

Preparation and evaluation of chitosan/β‐cyclodextrin magnetic nanoparticles as a photodegradable and hydrophobic drug delivery carrier

Contact Info

Product

Resources

About

Oxygen reduction to hydrogen peroxide on Fe3O4 nanoparticles supported on Printex carbon and Graphene

Cited by 147 publications

References 35 publications

Electrosynthesis of Hydrogen Peroxide Synergistically Catalyzed by Atomic Co–Nx–C Sites and Oxygen Functional Groups in Noble‐Metal‐Free Electrocatalysts

Electrosynthesis of Hydrogen Peroxide Synergistically Catalyzed by Atomic Co–Nx–C Sites and Oxygen Functional Groups in Noble‐Metal‐Free Electrocatalysts

Bifunctional Oxygen Reduction/Oxygen Evolution Activity of Mixed Fe/Co Oxide Nanoparticles with Variable Fe/Co Ratios Supported on Multiwalled Carbon Nanotubes

Preparation and evaluation of chitosan/β‐cyclodextrin magnetic nanoparticles as a photodegradable and hydrophobic drug delivery carrier

Contact Info

Product

Resources

About

Electrosynthesis of Hydrogen Peroxide Synergistically Catalyzed by Atomic Co–N_x–C Sites and Oxygen Functional Groups in Noble‐Metal‐Free Electrocatalysts

Electrosynthesis of Hydrogen Peroxide Synergistically Catalyzed by Atomic Co–N_x–C Sites and Oxygen Functional Groups in Noble‐Metal‐Free Electrocatalysts