-
- Home
- Journals
- Bulletin of Materials Science
-
M A C BERTON
Articles written in Bulletin of Materials Science
-
-
Volume 45 All articles Published: 8 June 2022 Article ID 0103
E H YANASE C S INAGAKI L S ROMAN E P M DOS SANTOS J C PEREIRA G PANINI H R DE FREITAS M A C BERTON
In order to improve the electrical efficiency of lead-acid batteries under partial state of charge, three additives for the negative active mass were synthesized by high-energy ball milling: (1) exfoliated graphite doped with nitrogen groups (GN) from urea and novel (2) ZnO/GN and (3) PbO/GN. The main variables of grinding medium, ball sizes and time were studied. All additives were characterized on Raman, X-ray diffraction (XRD) and scanning electron microscopy and pure, uniform composites of particle size${\le}$3 ${\mu}$m were demonstrably obtained. The optimized samples proceeded to electrochemical tests. Particularly, selected PbO/GN4-5 provided a 41% reduction in the current density for the H$_2$ evolution reaction at the working potential on linear sweep voltammetry tests. The produced additives indicated high charge efficiency on the formation process of a 2 V, 36 Ah lead-acid cell. Cycle life performances of cells containing 0.50% (
vs . LO) of selected GN4, PbO/GN4-5 and ZnO/GN4-5 surpassed that of commercial graphite, in 75, 328 and 752%, respectively. As a result, the produced additives represent a progress in enhancing commercial additives. The effects of these additives were further investigated after the teardown of the cells. The negative plate was pointed out to be the limiting factor and there is evidence that the additives provided a more uniform distribution and reduced the size of the PbSO$_4$ crystals.
-
-
Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
-
Bulletin of Materials Science | News
-
Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
Editorial Note on Continuous Article Publication
Posted on July 25, 2019Click here for Editorial Note on CAP Mode
-