scholarly journals Micro-recycling of spent Ni-Cd batteries for the obtention of electrocatalytic coatings

2022 ◽  
Author(s):  
Pedro Delvasto ◽  
Héctor Rueda ◽  
Andrés Monsalve ◽  
Ronald Vargas ◽  
Sergio Blanco ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Cyclic Voltammetry ◽  
Raw Material ◽  
Operating Voltage ◽  
Proof Of Concept ◽  
Dissolved Metals ◽  
Voltage Range ◽  
Catalytic Materials ◽  
Tafel Slopes ◽  
Wide Operating

Abstract A micro-recycling approach was explored to produce catalytic metallic coatings for the hydrogen evolution reaction (HER). For this aim, discarded Ni-Cd batteries were employed as raw material. After dismantling the batteries, the active powder material, containing Cd and Ni compounds, was leached in a solution containing citric acid and hydrogen peroxide. The dissolved metals were electro-deposited on copper plates using a two electrodes cell at the following potentials (mV): -1900, -2000, and -2100 mV. The CdNi coating produced at -2000 mV, contained 92.6 % Cd and 7.4 % Ni. This coating was studied by cyclic voltammetry (CV) and potentiodynamic analysis in two different KOH solutions (0.1 M and 1.0 M). The CV analysis showed that the CdNi electrode was electrochemically stable in a wide operating voltage range (between oxygen evolution reaction and HER). Using an uncompensated resistance correction, the Tafel slopes for HER were obtained. The potentiodynamic analysis revealed that the synthesized CdNi electrode showed a catalytic activity for HER just 25.5 % smaller than the correspondent response of a standard pure Ni electrode. Our results serve as a proof of concept about the application of micro-recycling of spent batteries to produce sustainable electroactive catalytic materials for hydrogen production.

scholarly journals Wide Operating Voltage Range Fuel Cell Battery Charger

2014 ◽  
Vol 20 (5) ◽  
Author(s):  
J. C. Hernandez ◽  
M. C. Mira ◽  
G. Sen ◽  
O. C. Thomsen ◽  
M. A. E. Andersen
Keyword(s):  
Fuel Cell ◽  
Operating Voltage ◽  
Battery Charger ◽  
Voltage Range ◽  
Wide Operating

Dynamic equalization and fast settling based wide operating voltage range 93 ​dB PSRR PTAT current reference

2020 ◽  
Vol 101 ◽  
pp. 104812
Author(s):  
Kai Jing ◽  
Ningmei Yu ◽  
Xing Quan ◽  
Zhaonian Yang ◽  
Zhongjie Guo
Keyword(s):  
Operating Voltage ◽  
Voltage Range ◽  
Current Reference ◽  
Fast Settling ◽  
Wide Operating

An SOI-DRAM with wide operating voltage range by CMOS/SIMOX technology

1994 ◽  
Vol 29 (11) ◽  
pp. 1323-1329 ◽  
Author(s):  
K. Suma ◽  
T. Tsuruda ◽  
H. Hidaka ◽  
T. Eimori ◽  
T. Oashi ◽  
...  
Keyword(s):  
Operating Voltage ◽  
Voltage Range ◽  
Wide Operating

scholarly journals Design of eFuse OTP Memory with Wide Operating Voltage Range for PMICs

2014 ◽  
Vol 18 (1) ◽  
pp. 115-122 ◽  
Author(s):  
Woo-Young Jeong ◽  
Wen-Chao Hao ◽  
Pan-Bong Ha ◽  
Young-Hee Kim
Keyword(s):  
Operating Voltage ◽  
Voltage Range ◽  
Wide Operating

scholarly journals Evaluation of Heterologous Biosynthetic Pathways for Methanol-Based 5-Aminovalerate Production by Thermophilic Bacillus methanolicus

2021 ◽  
Vol 9 ◽  
Author(s):  
Luciana Fernandes Brito ◽  
Marta Irla ◽  
Ingemar Nærdal ◽  
Simone Balzer Le ◽  
Baudoin Delépine ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Carbon Source ◽  
Raw Material ◽  
Methylotrophic Bacteria ◽  
Biosynthetic Pathways ◽  
Proof Of Concept ◽  
Thermophilic Bacillus ◽  
Bacillus Methanolicus ◽  
Biotechnological Processes ◽  
Putrescine Oxidase

The use of methanol as carbon source for biotechnological processes has recently attracted great interest due to its relatively low price, high abundance, high purity, and the fact that it is a non-food raw material. In this study, methanol-based production of 5-aminovalerate (5AVA) was established using recombinant Bacillus methanolicus strains. 5AVA is a building block of polyamides and a candidate to become the C5 platform chemical for the production of, among others, δ-valerolactam, 5-hydroxy-valerate, glutarate, and 1,5-pentanediol. In this study, we test five different 5AVA biosynthesis pathways, whereof two directly convert L-lysine to 5AVA and three use cadaverine as an intermediate. The conversion of L-lysine to 5AVA employs lysine 2-monooxygenase (DavB) and 5-aminovaleramidase (DavA), encoded by the well-known Pseudomonas putida cluster davBA, among others, or lysine α-oxidase (RaiP) in the presence of hydrogen peroxide. Cadaverine is converted either to γ-glutamine-cadaverine by glutamine synthetase (SpuI) or to 5-aminopentanal through activity of putrescine oxidase (Puo) or putrescine transaminase (PatA). Our efforts resulted in proof-of-concept 5AVA production from methanol at 50°C, enabled by two pathways out of the five tested with the highest titer of 0.02 g l–1. To our knowledge, this is the first report of 5AVA production from methanol in methylotrophic bacteria, and the recombinant strains and knowledge generated should represent a valuable basis for further improved 5AVA production from methanol.

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