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Redox

About: Redox is a research topic. Over the lifetime, 26853 publications have been published within this topic receiving 862368 citations. The topic is also known as: reduction-oxidation & reduction-oxidation reaction.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the equilibrium solubility of mixed-valence Mn oxides was analyzed and four graphs were summarized in four graphs for Co, Pb, Ni and some other elements.

175 citations

Journal ArticleDOI
TL;DR: In this paper, a reversible Zn/MnO2 battery with zinc hydroxide sulfate (Zn4(OH)6SO4·5H2O, ZHS) as the cathode has been designed, where active MnO2 is formed in situ during the initial charge process from the Mn(II)-containing ZnSO4 electrolyte.
Abstract: Aqueous Zn/MnO2 rechargeable batteries utilizing a near neutral electrolyte have demonstrated great potential for large-scale energy storage applications, due to their safe and sustainable nature. Nevertheless, the reaction chemistry and degradation process associated with the MnO2-based cathode is not yet fully understood. Herein, a novel reversible Zn/MnO2 battery with zinc hydroxide sulfate (Zn4(OH)6SO4·5H2O, ZHS) as the cathode has been designed, where active MnO2 is formed in situ during the initial charge process from the Mn(II)-containing ZnSO4 electrolyte. A combination of electrochemical and material characterizations reveal two-step redox reactions (Mn(II) ions ⇌ ZnMn2O4 spinel ⇌ layered Zn-birnessite) during the charge–discharge process. Excellent cycling stability with a capacity retention of 100% after 1500 cycles is achieved at 500 mA g−1. The mechanism for long-term capacity fading is also studied. Cycling reversibility is destroyed by the irreversible consumption of Mn(II) to form woodruffite with a tunnel structure and poor electrochemical activity.

175 citations

Journal ArticleDOI
TL;DR: The negligibly small rate constants of related spontaneous reactions as compared with enzyme-catalyzed ones underscore the superiority of kinetic parameters over electrochemical or thermodynamic ones for an in-depth understanding of GSH-dependent biological phenomena.

175 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of the electrolyte (nature and concentration, as well as current rate, on the aging of the positive electrode during the operation of the battery is investigated by using differential charge curves.

175 citations

Journal ArticleDOI
TL;DR: The design, synthesis optimization of the composition, and characterization of the +0.55 V (AgAgCl) laccase-wiring redox hydrogel results in the tethering of redox centers to the polymer backbone through eight-atom-long spacer arms, which facilitate collisional electron transfer between proximal redox Centers.
Abstract: Laccase was earlier wired to yield an O2 electroreduction catalyst greatly outperforming platinum and its alloys. Here we describe the design, synthesis optimization of the composition, and characterization of the +0.55 V (AgAgCl) laccase-wiring redox hydrogel, with an apparent electron diffusion coefficient (Dapp) of 7.6 × 10-7 cm2 s-1. The high Dapp results in the tethering of redox centers to the polymer backbone through eight-atom-long spacer arms, which facilitate collisional electron transfer between proximal redox centers. The O2 flux-limited, true-area-based current density was increased from the earlier reported 560 to 860 μA cm-2. When the O2 diffusion to the 7-μm-diameter carbon fiber cathode was cylindrical, half of the O2 flux-limited current was reached already at 0.62 V and 90% at 0.56 V vs Ag/AgCl, merely −0.08 and −0.14 V versus the 0.7 V (Ag/AgCl) reversible O2/H2O half-cell potential at pH 5.

174 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
20233,178
20225,931
20211,509
20201,274
20191,219