DEMS Cell with Central Electrolyte Inlet and Pervaporation Membrane
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current differential electrochemical mass spectrometry (DEMS) cell designs face challenges such as non-parallel electrode configurations, low product collection efficiencies, and reactant diffusion limitations, which hinder accurate characterization of electrocatalyst activity and selectivity in CO2 reduction reactions, particularly due to issues like product dilution and reduced detectability.
Innovation Solution
A novel DEMS cell design featuring a washer-shaped working electrode with electrolyte entering through its center, ensuring a parallel electrode configuration, minimal electrolyte volume, and efficient electrolyte flow to minimize transit time and prevent product dilution, while using a pervaporation membrane to separate and collect reaction products effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electrolyte flow rate is increased to reduce transit time and improve product collection efficiency, then product detection sensitivity improves, but product dilution increases and detectability decreases
Solution Approach 1:
The cell is divided into distinct chambers (reaction chamber and collection chamber) separated by a membrane, allowing the electrolyte to flow through a defined path that minimizes mixing and dilution while maintaining efficient product transport from the electrode to the detection interface
Solution Approach 2:
A thin pervaporation membrane is used to separate the reaction and collection chambers, enabling rapid product transfer through the membrane while maintaining a compact cell design that minimizes electrolyte volume and reduces dilution effects even at higher flow rates
2Device complexity
If electrode configuration is made non-parallel to simplify cell design, then device complexity decreases, but measurement precision of electrocatalyst activity and selectivity deteriorates
Solution Approach 1:
The parallel electrode configuration serves multiple functions: it ensures uniform current distribution for accurate kinetic measurements, maintains consistent spacing for reproducible experiments, and simplifies the alignment process during cell assembly, thereby achieving both measurement precision and ease of setup
3Quantity of substance
If electrolyte volume is increased to improve mass transport, then reactant diffusion limitations are reduced, but product dilution increases and collection efficiency decreases
Solution Approach 1:
A thin electrolyte layer is maintained between the electrode and the pervaporation membrane, minimizing the volume of electrolyte in the reaction chamber. This reduces product dilution while the applied potential drives efficient mass transport across the thin layer, maintaining high collection efficiency
Solution Approach 2:
Electrolyte flow is driven through the cell using controlled pumping, creating convective mass transport that enhances reactant delivery to the electrode and product removal from the reaction zone without requiring large electrolyte volumes, thus maintaining high product concentration for efficient collection
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
The design enables real-time monitoring and quantification of gaseous and liquid phase products during CO2 reduction, improving the accuracy and efficiency of electrocatalyst characterization by maintaining high product collection efficiency and reducing the impact of electrolyte flow on potential referencing.
Implementation Method 1
Differential electrochemical mass spectrometry (DEMS) is an analytical technique that combines an electrochemical half-cell experiment with mass spectrometry, uniting the two with a pervaporation membrane
Data Source
AI summary
The present invention provides for a differential electrochemical mass spectrometry (DEMS) cell comprising a working electrode chamber configured such that an electrolyte enters the working electrode chamber through a channel running through the working electrode.