Simultaneously Realizing Rapid Electron Transfer and Mass Transport in Jellyfish‐Like Mott–Schottky Nanoreactors for Oxygen Reduction Reaction

2020 ◽  
Vol 30 (15) ◽  
pp. 1910482 ◽  
Author(s):  
Zehui Sun ◽  
Yuankun Wang ◽  
Libo Zhang ◽  
Hu Wu ◽  
Yachao Jin ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Mass Transport ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction

scholarly journals The oxygen reduction reaction catalyzed by Synechocystis sp. PCC 6803 flavodiiron proteins

2019 ◽  
Vol 3 (11) ◽  
pp. 3191-3200 ◽  
Author(s):  
Katherine A. Brown ◽  
Zhanjun Guo ◽  
Monika Tokmina-Lukaszewska ◽  
Liam W. Scott ◽  
Carolyn E. Lubner ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Heme Iron ◽  
Non Heme Iron ◽  
Mediated Electron Transfer ◽  
Synechocystis Sp ◽  
Pcc 6803

Photosynthetic flavodiiron proteins catalyze oxygen reduction at non-heme iron sites (brown spheres) using flavin (FMN) mediated electron transfer (black arrows).

scholarly journals Oxygen Reduction Reaction on Polycrystalline Platinum: On the Activity Enhancing Effect of Polyvinylidene Difluoride

Surfaces ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 69-77
Author(s):  
Alessandro Zana ◽  
Gustav Wiberg ◽  
Matthias Arenz
Keyword(s):  
Mass Transport ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Surface Area ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Rotating Disk Electrode ◽  
Membrane Electrode ◽  
Active Surface Area ◽  
Polyvinylidene Difluoride

There have been several reports concerning the performance improving properties of additives, such as polyvinylidene difluoride (PVDF), to the membrane or electrocatalyst layer of proton exchange membrane fuel cells (PEMFC). However, it is not clear if the observed performance enhancement is due to kinetic, mass transport, or anion blocking effects of the PVDF. In a previous investigation using a thin-film rotating disk electrode (RDE) approach (of decreased complexity as compared to membrane electrode assembly (MEA) tests), a performance increase for the oxygen reduction reaction (ORR) could be confirmed. However, even in RDE measurements, reactant mass transport in the catalyst layer cannot be neglected. Therefore, in the present study, the influence of PVDF is re-examined by coating polycrystalline bulk Pt electrodes by PVDF and measuring ORR activity. The results on polycrystalline bulk Pt indicate that the effects of PVDF on the reaction kinetics and anion adsorption are limited, and that the observed performance increase on high surface area Pt/C most likely is due to an erroneous estimation of the electrochemical active surface area (ECSA) from CO stripping and Hupd.

Highly efficient and sustainable non-precious-metal Fe–N–C electrocatalysts for the oxygen reduction reaction

2018 ◽  
Vol 6 (6) ◽  
pp. 2527-2539 ◽  
Author(s):  
Meng Sun ◽  
Douglas Davenport ◽  
Huijuan Liu ◽  
Jiuhui Qu ◽  
Menachem Elimelech ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Precious Metal ◽  
Reduction Reaction ◽  
Electron Transfer Pathway ◽  
Highly Efficient

Efficient and sustainable Fe–N–C catalyst prepared by EDTA–Fe(ii) pyrolysis promotes the ORR performances within a nearly four-electron transfer pathway.

The oxygen reduction reaction at the three-phase boundary: nanoelectrodes modified with Ag nanoclusters

2016 ◽  
Vol 193 ◽  
pp. 241-250 ◽  
Author(s):  
Jan Clausmeyer ◽  
Alexander Botz ◽  
Denis Öhl ◽  
Wolfgang Schuhmann
Keyword(s):  
Mass Transport ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Local Delivery ◽  
Model Systems ◽  
Alkaline Media ◽  
High Mass ◽  
Slow Diffusion ◽  
Ag Nanoclusters

Silver nanoclusters are deposited on bifunctional Θ-shaped nanoelectrodes consisting of a carbon nanoelectrode combined with a hollow nanopipette. The Θ-nanoelectrodes are used as model systems to study interfacial mass transport in gas diffusion electrodes and in particular oxygen-depolarized cathodes (ODC) for the oxygen reduction reaction (ORR) in chlor-alkali electrolysers. By local delivery of O2 gas to the electroactive Ag nanoclusters through the adjacent nanopipette, enhanced currents for the ORR at the Ag nanoparticles are recorded which are not accountable when considering the low solubility and slow diffusion of O2 in highly alkaline media. Instead, local oversaturation of O2 leads to current enhancement at the Ag nanoclusters. Due to the intrinsic high mass transport rates at the nanometric electrodes accompanied by local delivery of reactants, the method generally allows to study electrochemical reactions at single nanoparticles beyond the limitations induced by slow diffusion and low reactant concentration. Kinetic and mechanistic information, for instance derived from Tafel slopes, can be obtained from kinetic regimes not accessible to standard techniques.

Efficient oxygen reduction reaction using mesoporous Ni-doped Co3O4 nanowire array electrocatalysts

2015 ◽  
Vol 3 (36) ◽  
pp. 18372-18379 ◽  
Author(s):  
Xili Tong ◽  
Xinhui Xia ◽  
Congxiu Guo ◽  
Yongqi Zhang ◽  
Jiangping Tu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Nanowire Array ◽  
Hydrothermal Process ◽  
Transfer Characteristic ◽  
Reduction Reaction ◽  
Electrochemical Activity ◽  
Nanowire Arrays ◽  
Simple Hydrothermal Process

Mesoporous Ni-doped Co3O4 nanowire arrays synthesized via a simple hydrothermal process exhibit high electrochemical activity and a four-electron transfer characteristic, with superior tolerance to methanol and CO, and better stability compared to a commercial Pt/C catalyst.

L2,3-edges absorption spectra of a 2D complex system: a theoretical modelling

2016 ◽  
Vol 18 (40) ◽  
pp. 28110-28116 ◽  
Author(s):  
S. Carlotto ◽  
M. Sambi ◽  
F. Sedona ◽  
A. Vittadini ◽  
J. Bartolomé ◽  
...  
Keyword(s):  
Complex System ◽  
Electron Transfer ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Absorption Spectra ◽  
Ground State ◽  
Reduction Reaction ◽  
Theoretical Modelling ◽  
Electron Transfer Pathway ◽  
System A

Ground state theoretical outcomes pertaining to FePc (I) and FePc(η2-O2) (II) provide an intimate understanding of the electron transfer pathway ruling the catalytic oxygen reduction reaction of I on Ag(110).

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