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24. Study on Influence Factors of H 2 O 2 Generation Efficiency on Both Cathode and Anode in a Diaphragm-Free Bath.

Author

Tian, Tian, Wang, Zhaohui, Li, Kun, Jin, Honglei, Tang, Yang, Sun, Yanzhi, Wan, Pingyu, and Chen, Yongmei

Subjects
CATHODE efficiency, ANODES, PROTHROMBIN, OXIDATION of water, CARBON nanotubes, ELECTROSYNTHESIS, OXYGEN reduction
Abstract

Electrosynthesis of H2O2 via both pathways of anodic two-electron water oxidation reaction (2e-WOR) and cathodic two-electron oxygen reduction reaction (2e-ORR) in a diaphragm-free bath can not only improve the generation rate and Faraday efficiency (FE), but also simplify the structure of the electrolysis bath and reduce the energy consumption. The factors that may affect the efficiency of H2O2 generation in coupled electrolytic systems have been systematically investigated. A piece of fluorine-doped tin oxide (FTO) electrode was used as the anode, and in this study, its catalytic performance for 2e-WOR in Na2CO3/NaHCO3 and NaOH solutions was compared. Based on kinetic views, the generation rate of H2O2 via 2e-WOR, the self-decomposition, and the oxidative decomposition rate of the generated H2O2 during electrolysis in carbonate electrolytes were investigated. Furthermore, by choosing polyethylene oxide-modified carbon nanotubes (PEO-CNTs) as the catalyst for 2e-ORR and using its loaded electrode as the cathode, the coupled electrolytic systems for H2O2 generation were set up in a diaphragm bath and in a diaphragm-free bath. It was found that the generated H2O2 in the electrolyte diffuses and causes oxidative decomposition on the anode, which is the main influent factor on the accumulated concentration in H2O2 in a diaphragm-free bath. [ABSTRACT FROM AUTHOR]

Published
2024
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25. Solvothermal Guided V 2 O 5 Microspherical Nanoparticles Constructing High-Performance Aqueous Zinc-Ion Batteries.

Author

Jia, Xianghui, Yan, Kaixi, Sun, Yanzhi, Chen, Yongmei, Tang, Yang, Pan, Junqing, and Wan, Pingyu

Subjects
NANOPARTICLES, FAST ions, COST effectiveness, STORAGE batteries, NANORODS, AQUEOUS electrolytes
Abstract

Rechargeable aqueous zinc-ion batteries have attracted a lot of attention owing to their cost effectiveness and plentiful resources, but less research has been conducted on the aspect of high volumetric energy density, which is crucial to the space available for the batteries in practical applications. In this work, highly crystalline V2O5 microspheres were self-assembled from one-dimensional V2O5 nanorod structures by a template-free solvothermal method, which were used as cathode materials for zinc-ion batteries with high performance, enabling fast ion transport, outstanding cycle stability and excellent rate capability, as well as a significant increase in tap density. Specifically, the V2O5 microspheres achieve a reversible specific capacity of 414.7 mAh g−1 at 0.1 A g−1, and show a long-term cycling stability retaining 76.5% after 3000 cycles at 2 A g−1. This work provides an efficient route for the synthesis of three-dimensional materials with stable structures, excellent electrochemical performance and high tap density. [ABSTRACT FROM AUTHOR]

Published
2024
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