Electrolytic Reduction Device Using Periodic Voltage for Ion Desorption
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Solution Overview
Problem
In conventional electrolytic reduction devices, ions such as protons and HCOO− adsorbed on the reduction electrode surface reduce the reaction area and suppress the reduction reaction, leading to inefficiency.
Innovation Solution
An electrolytic reduction device applies a voltage with a predetermined cycle to desorb ions from the surface of both the oxidation and reduction electrodes, using an AC voltage with specific frequency and amplitude to enhance ion desorption and maintain reaction surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If constant DC voltage is applied to maintain reduction reaction, then reduction reaction proceeds continuously, but ions adsorb on electrode surface and reduce reaction area
Solution Approach 1:
The patent applies periodic voltage reversal to the reduction electrode, switching between reduction potential and cleaning potential. During the cleaning phase, the voltage is reversed to desorb adsorbed ions from the electrode surface, restoring the reaction area. This periodic action resolves the contradiction by maintaining reaction area while ensuring continuous reduction reaction productivity.
Solution Approach 2:
The patent discards the accumulated adsorbed ions by applying reverse voltage to detach them from the electrode surface. These desorbed ions are then recovered into the electrolyte solution, preventing permanent loss of reaction area. This principle addresses the contradiction by periodically removing harmful adsorbed substances while maintaining electrode functionality.
2Productivity
If higher voltage is applied to increase reaction rate, then reduction reaction efficiency improves, but ion adsorption on electrode surface increases
Solution Approach 1:
The patent employs periodic voltage application with alternating phases: a reduction phase at higher voltage to drive the reduction reaction at high rate, followed by a cleaning phase with reversed voltage to desorb adsorbed ions. This periodic action allows the system to achieve high reaction rates while periodically eliminating the harmful effect of ion adsorption that would otherwise accumulate at higher voltages.
Solution Approach 2:
The patent applies preliminary anti-action by using reverse voltage to prevent and remove ion adsorption before it significantly reduces the reaction area. The cleaning potential is applied in advance to counteract the adsorption tendency caused by the reduction potential, thereby maintaining electrode performance even at higher operating voltages.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly improves the efficiency of the reduction reaction by increasing current values and Faraday efficiency, resulting in higher production rates of gases like hydrogen, carbon monoxide, and methane.
Implementation Method 1
a voltage value that changes with a predetermined cycle to be a voltage value at which ions can be desorbed from a surface of the oxidation electrode and a surface of the reduction electrode
Implementation Method 2
By connecting a power source between the electrodes and applying a constant DC voltage which has a value high enough for reactions of the oxidation electrode and the reduction electrode to proceed, protons and carbon dioxides are reduced on the reduction electrode side
Data Source
AI summary
To improve the efficiency of a reduction reaction. A power source applies a voltage to an oxidation electrode immersed in an aqueous solution in an oxidation tank and a reduction electrode immersed in an aqueous solution in a reduction tank, the voltage having a voltage value that changes with a predetermined cycle to be a voltage value at which ions can be desorbed from a surface of the oxidation electrode and a surface of the reduction electrode during one cycle of the voltage change. The frequency of the voltage is set within a range of 10 Hz to 1 kHz.