Impact of Surface Hydrophilicity of Gas-Diffusion-Type Biocathodes on Their Oxygen Reduction Ability for Biofuel Cells

AbstractRigorous electrokinetic results are key to understanding the reaction mechanisms in the electrochemical CO reduction reaction (CORR), however, most reported results are compromised by the CO mass transport limitation. In this work, we determined mass transport-free CORR kinetics by employing a gas-diffusion type electrode and identified dependence of catalyst surface speciation on the electrolyte pH using in-situ surface enhanced vibrational spectroscopies. Based on the measured Tafel slopes and reaction orders, we demonstrate that the formation rates of C2+ products are most likely limited by the dimerization of CO adsorbate. CH4 production is limited by the CO hydrogenation step via a proton coupled electron transfer and a chemical hydrogenation step of CO by adsorbed hydrogen atom in weakly (7 < pH < 11) and strongly (pH > 11) alkaline electrolytes, respectively. Further, CH4 and C2+ products are likely formed on distinct types of active sites.

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Bionic design of cytochrome c oxidase-like single-atom nanozymes for oxygen reduction reaction in enzymatic biofuel cells

Nano Energy ◽

10.1016/j.nanoen.2021.105798 ◽

2021 ◽

Vol 83 ◽

pp. 105798

Author(s):

He Zhang ◽

Liang Huang ◽

Jinxing Chen ◽

Ling Liu ◽

Xinyang Zhu ◽

...

Keyword(s):

Cytochrome C ◽

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Cytochrome C Oxidase ◽

Reduction Reaction ◽

Biofuel Cells ◽

Single Atom ◽

Bionic Design ◽

Enzymatic Biofuel Cells

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Cobalt/nitrogen doped porous carbon as catalysts for efficient oxygen reduction reaction: towards hybrid enzymatic biofuel cells

Electrochimica Acta ◽

10.1016/j.electacta.2021.138791 ◽

2021 ◽

pp. 138791

Author(s):

Xiaogeng Feng ◽

Xinxin Xiao ◽

Jingdong Zhang ◽

Liping Guo ◽

Ying Xiong

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Porous Carbon ◽

Reduction Reaction ◽

Biofuel Cells ◽

Nitrogen Doped ◽

Enzymatic Biofuel Cells

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Gas Diffusion-Type Oxygen Electrode Using Perovskite-Type Oxides for Metal-Air Batteries

MRS Proceedings ◽

10.1557/proc-393-79 ◽

1995 ◽

Vol 393 ◽

Cited By ~ 7

Author(s):

Takeo Hyodo ◽

Norio Miura ◽

Noboru Yamazoe

Keyword(s):

Active Sites ◽

Electrode Reaction ◽

Oxygen Electrode ◽

Gas Diffusion ◽

Air Cathode ◽

Diffusion Type ◽

Reduction Behavior ◽

Term Operation ◽

Electron Reduction ◽

Perovskite Type

ABSTRACTIn order to develop an air cathode of metal-air batteries, oxygen reduction behavior of gas diffusion-type carbon electrodes loaded with perovskite-type oxides, Lai-xA'xFe03(A'=Ca, Sr, Ba, 0<x<1.0), was examined in 8 M KOH at 60 °C. Among the oxide catalysts tested, La0.5Sr0.5Fe03(specific surface area : 21.5 m2.g−1) gave the highest electrode performance. On the basis of electrode reaction kinetics, H2O2decomposition rates, and temperature programed desorption of oxygen, it was concluded that such a performance was attributable to the active sites of the oxide for the direct 4-electron reduction of oxygen. Moreover, the electrode using Lao.5Sro.5FeO3was found to be rather stable in a short-term operation for 90 h at 300 mA-cm−2.

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