CO2 Conversion Apparatus Using Hydrogen Oxidation Reaction
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Solution Overview
Problem
Conventional electrochemical carbon dioxide conversion processes require high theoretical voltage and overpotential due to oxygen evolution reaction, leading to decreased selectivity for carbon monoxide production.
Innovation Solution
A carbon dioxide conversion apparatus utilizing a hydrogen oxidation reaction with a hydrogen oxidation reaction catalyst and a metal nanocluster catalyst at the oxidation and reduction electrodes, respectively, to reduce electrical energy requirements and enhance selectivity for carbon monoxide production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If oxygen evolution reaction (OER) is used as the opposite reaction of carbon dioxide reduction reaction, then carbon dioxide can be converted into carbon compounds, but high theoretical voltage and overpotential are required, increasing energy consumption
Solution Approach 1:
The patent changes the reaction type at the oxidation electrode from oxygen evolution reaction (OER) to hydrogen oxidation reaction (HOR). This parameter change in the electrochemical reaction mechanism reduces the theoretical voltage from 1.34 V to 0.11 V, significantly decreasing electrical energy consumption while maintaining carbon dioxide conversion functionality
Solution Approach 2:
The patent replaces the conventional OER-based electrochemical system with a HOR-based system. This substitution fundamentally changes the energy requirements by using a different electrochemical mechanism that operates at much lower voltage, thereby resolving the contradiction between energy consumption and conversion efficiency
2Productivity
If hydrogen evolution reaction (HER) occurs simultaneously during carbon dioxide reduction reaction, then carbon dioxide conversion can proceed, but selectivity for carbon dioxide reduction product decreases
Solution Approach 1:
The patent employs a gas diffusion electrode with metal nanocluster catalyst that creates localized reaction environments. The porous structure and nanoscale catalysts provide specific active sites that favor carbon dioxide reduction over hydrogen evolution, achieving high selectivity (95% or higher) while maintaining high carbon dioxide reduction rate
Solution Approach 2:
The patent uses composite electrode structures combining gas diffusion layers with metal nanocluster catalysts. This composite material design enables simultaneous high productivity and high selectivity by integrating mass transport capabilities with catalytic selectivity at the nanoscale
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
Significantly reduces the amount of electrical energy needed for carbon dioxide conversion and increases the selectivity for carbon monoxide to 95% or higher, improving energy efficiency and product yield.
Implementation Method 1
the oxidation electrode includes a hydrogen oxidation reaction (HOR) catalyst
Implementation Method 2
the reduction electrode is a gas diffusion electrode including a metal nanocluster catalyst
Implementation Method 3
the metal nanocluster catalyst may have an average particle diameter of 10 nm or smaller
Implementation Method 4
an ion-exchange membrane disposed between the oxidation electrode and the reduction electrode
Data Source
AI summary
The present disclosure relates to a carbon dioxide conversion apparatus for preparing carbon monoxide: including an oxidation electrode; a reduction electrode opposing and spaced apart from the oxidation electrode; and an ion-exchange membrane disposed between the oxidation electrode and the reduction electrode, wherein the oxidation electrode includes a hydrogen oxidation reaction (HOR) catalyst, and the reduction electrode is a gas diffusion electrode including a metal nanocluster catalyst, and an electrochemical carbon dioxide conversion method using the same. According to the present disclosure, the electrical energy required for conversion of carbon dioxide can be decreased significantly and the selectivity for carbon monoxide can be improved.