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29. 3D-Graphite Felt Self-loaded Rich Co3O4 Nanoparticle Electrodes for Chlorine Evolution Reaction at Low Concentration Chloride Ion.

Author

Wang, Zihui, Yuan, Qinbo, Li, Yu, Zhou, Xianxian, Liu, Xiaoxiao, Yang, Huazhao, Zhang, Zhonglin, Duan, Donghong, and Liu, Shibin

Subjects
CHLORIDE ions, NANOPARTICLES, BODIES of water, CHLORINE, CATALYTIC activity, ELECTRODES
Abstract

To investigate a highly active catalyst for CER and explore low concentrations of Cl− electrocatalytic product Cl2, Co3O4/GF catalysts were constructed by a methanesulfonic acid system plating and calcination process. SEM shows Co3O4/GF-0.1 has a uniform distribution of nanoparticles. TEM, XRD, and XPS results confirmed the formation of Co3O4. The catalytic activity in high concentrations of Cl− and low concentrations of Cl− are discussed. LSV suggests Co3O4/GF-0.1 with an initial potential of 1.06 V, The overpotential at a current density of 10 mA cm−2 is 232 m V, Tafel slope 109.26 mV dec−1, the CER reaction order is 0.54 at 1, 2 and 3 M NaCl, and 0.18 at 4, 5 and 6 M NaCl, too high concentration of Cl− slow down control of speed. In low concentration solution, the CER reaction order is 0.99, which can achieve the degradation rate of 90.8% in 50 ppm ammonia nitrogen. The apparent constant and the concentration of Cl− conform to the equation K = 1.44 × 10–3 C00.95. From low concentration to high concentration, energy consumption decreased, and Faraday efficiency increased. Electrode with jECSA = 0.52 mA cm−2, 3D structure GF has a large specific active area that promotes the diffusion of Cl−. This work provides analysis methods and ideas for the preparation of the high activity and stability CER catalyst at low Cl− concentrations in the actual water body. [ABSTRACT FROM AUTHOR]

Published
2024
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36. Improving the cycling stability of LiNi0.8Co0.1Mn0.1O2 by boron doping to inhibit Li/Ni mixing.

Author

Hu, Ziru, Duan, Donghong, Wang, Haorui, Xu, Shoudong, Chen, Liang, and Zhang, Ding

Subjects
*PHASE transitions, *CHARGE transfer, *BORON, *CYCLING competitions
Abstract

Boron doping significantly reduces the Li/Ni cation mixing of LiNi0.8Co0.1Mn0.1O2, decreases the charge transfer resistance, and improves the reversibility of the H2–H3 phase transition at 4.2 V. Among similar materials, the cathode material with 1.0 mol% boron doping shows excellent cycling performance, with capacity retention of 96% after 200 cycles at 50 °C. [ABSTRACT FROM AUTHOR]

Published
2023
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