Electrochemical production of hydrogen in reactors with reduced energy costs

Нефедов, В. Г.; Matveev, V. V.; Sukhyy, K.M.; Polishchuk, Yu.; Bulat, A.F.; Bluss, Borys; Mukhachev, A.P.

doi:10.1088/1755-1315/1156/1/012034

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…The solution enters the electrolyzer after a saturator, coagulator, and filter press [11], where ferric iron hydroxides are separated, the solubility product of which is of the order of 10 -38 . Therefore, we can assume that the iron concentration at the inlet into the electrolyzer is zero.…”

Section: Materials Balances 331 Materials Balance Of the Anode Mediummentioning

confidence: 99%

Transfer processes in porous diaphragms and ion-exchange membranes for hydrogen production in electrochemical reactor with reduced energy consumption

Nefedov,

Matveev,

Polishchuk

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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This paper presents the results of measuring the main physicochemical parameters of diaphragm materials (porous polypropylene, asbestos, mipor, polypropylene, nylon and chlorine fabrics) and the MA-40 anion-exchange membrane. These materials can be used to separate electrode chambers in an electrochemical reactor for producing hydrogen with reduced energy consumption. The values of materials (diffusion and migration) flows in the cathode and anode chambers are described and calculated for the use of porous separating partitions and an anion-exchange membrane. It has been experimentally proven that for woven separating materials, filtration transfer of substances is possible when the pressure in the electrode chambers changes. The complex of obtained results of the studied separating partitions (diaphragms and anion-exchange membrane) clearly indicates the feasibility of using an anion-exchange membrane in an electrochemical reactor with a soluble iron anode to produce hydrogen with reduced energy costs.

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Section: Materials Balances 331 Materials Balance Of the Anode Mediummentioning

confidence: 99%

Transfer processes in porous diaphragms and ion-exchange membranes for hydrogen production in electrochemical reactor with reduced energy consumption

Nefedov,

Matveev,

Polishchuk

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…We have proposed a combined open mass transfer system [9], in which the traditional anodic process of oxygen release is replaced by the dissolution of a "sacrificial" anode made of electronegative metals, namely aluminum or its alloys; and hydrogen is released on the cathode from catalytically active materials with a low process overvoltage. The equilibrium potential of hydrogen release in an alkaline medium is about -0.8 V and the aluminum potential is about -1.66 V. Such a system has an electromotive force of about 0.86 V. This means that the process occurs spontaneously without any electric current application.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen production with reduced energy consumption for use in fuel cells and energy sector

Nefedov,

Polishchuk,

Matveev

et al. 2024

Monatsh Chem

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The possibility of increasing the hydrogen release rate and reducing energy consumption was analyzed using a system in which the anodic process of metal (aluminum) dissolution occurred on one electrode and the process of H 2 release -on the other (nickel) electrode. The possibility of generating hydrogen with a current density of ~ 400 mA cm -2 in NaOH solutions with a concentration of 6 ÷ 8 mol L -1 at a cell voltage of ~ 0.5 V was confirmed. When the electrodes were short-circuited, hydrogen was generated on nickel when aluminum was dissolved at a rate corresponding to current density ~ 100 mA cm -2 . The possibility of simultaneous hydrogen production and electricity generation in the system under consideration was shown. It was found that the maximum net power was generated in 6 M NaOH. The specific power in such a solution can MCCM_Template_Vers 4May 2014 2 reach a value of 8 W cm -2 at a cell voltage of about 0.15 V. In this case, the hydrogen release rate corresponded to a current density of 60 mA cm -2 .

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Hydrogen production in a combined electrochemical system: anode process

2023

Geoteh. meh.

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Various methods of hydrogen production are known: traditional (for example, electrolysis of water and conversion of hydrocarbons) and combined thermochemical methods. The method of obtaining hydrogen by electrolysis of aqueous solutions of hydroxides of alkali metals is the most energy-intensive one, though considered one of the most promising in the European Union. The purpose of this work is the scientific substantiation of the electrochemical production of hydrogen with reduced energy consumption in a combined, open mass transfer system, the composition of the catholyte, and the concentration of its components to ensure the conditions for reducing the energy consumption for the hydrogen release. To reduce the energy consumption for hydrogen production in the combined electrochemical method, the anode on which oxygen is released in an acidic medium is replaced by a soluble anode with an equilibrium potential more negative than the potential of oxygen release. Such a soluble anode can be iron with a standard potential of –0.44 V. At the same time, the decomposition voltage in this system was equal to 0.41 V compared to 1.23 V in the case of traditional electrolysis of water. The overvoltage of iron dissolution in a chloride medium is several tens of millivolts, and the potential difference between the anode and the cathode when hydrogen is released can be much smaller than during the usual decomposition of water. The Pourbaix diagram and possible products of the electrochemical dissolution of iron were considered. The process of iron dissolution was studied in a 1 mol·L–1 solution based on Na2SO4 in the addition of NaCl with concentrations up to about 50 g·L–1. The cathode was platinum, the anode was the St3 iron electrode According to the data of cyclic voltammetry, it was established that the maximum current density of iron dissolution increases with an increase in the concentration of sodium chloride in the electrolyte. The dynamics of changes in the potential values of the onset passivation (the Flade potential) and complete passivation (activation potential) depending on the concentration of sodium chloride were also established. It is established that with an increase in NaCl concentration up to 50 g·L–1, the Flade potential is shifted shifts towards anode by 0.8 V. At average chlorine concentrations of ~10 g·L–1, intense current fluctuations are observed instead of passivation. The maximum of dissolution iron anode current density 700 mA·cm–2 was achieved in the Na2SO4 solution with the addition of NaCl in the amount of 50 g·L–1. Keywords: hydrogen, electrolysis, cathode, soluble iron anode, hydrogen energy.

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Electrochemical production of hydrogen in reactors with reduced energy costs

Cited by 6 publications

References 12 publications

Transfer processes in porous diaphragms and ion-exchange membranes for hydrogen production in electrochemical reactor with reduced energy consumption

Transfer processes in porous diaphragms and ion-exchange membranes for hydrogen production in electrochemical reactor with reduced energy consumption

Hydrogen production with reduced energy consumption for use in fuel cells and energy sector

Hydrogen production in a combined electrochemical system: anode process

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