Amorphous Indium Bismuth Catalyst for CO2 Reduction
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Solution Overview
Problem
Existing catalyst systems for the electrochemical reduction of carbon dioxide lack selectivity and Faradaic efficiency for producing valuable products like carboxylic acids and carboxylates.
Innovation Solution
A gas-diffusion electrode with an amorphous binary indium bismuth catalyst, where bismuth constitutes 10-90 wt.% of the catalyst, preferably 40-60 wt.%, is used to enhance the selectivity and Faradaic yield for the reduction of carbon dioxide into carboxylic acids and carboxylates, particularly formate salt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalyst systems are used for electrochemical reduction of carbon dioxide, then the reaction can proceed, but the selectivity and Faradaic efficiency for producing valuable products like carboxylic acids and carboxylates are insufficient
Solution Approach 1:
The patent changes the compositional parameters of the catalyst by using an amorphous binary indium bismuth system with bismuth content specifically controlled in the range of 10-90 wt.%. This parameter optimization resolves the contradiction by achieving both high Faradaic efficiency (27) and high selectivity (29) for carboxylic acid and carboxylate production, overcoming the limitations of conventional catalyst systems.
Solution Approach 2:
The patent employs a composite catalyst system combining indium and bismuth in an amorphous binary alloy structure. This composite material approach (principle 40) enables synergistic effects between the two metals, simultaneously improving Faradaic efficiency and selectivity for valuable reduction products, thereby resolving the technical contradiction between these two performance metrics.
2Productivity
If indium-based binary metal catalysts are used, then carbon dioxide reduction occurs, but the Faradaic yield and selectivity are not optimized
Solution Approach 1:
The patent optimizes the compositional parameter of bismuth content in the indium-based catalyst, specifying a range of 10-90 wt.% Bi (preferably 40-60 wt.%). This parameter change resolves the contradiction by maximizing both Faradaic yield (39) and selectivity (29) towards carboxylic acids and carboxylates, outperforming other indium-based binary metal catalysts.
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 indium bismuth catalyst system demonstrates improved Faradaic yield and selectivity for carbon dioxide conversion to carboxylic acids and carboxylates, outperforming other indium-based binary metal catalysts, with optimal bismuth content between 40-60 wt.%, achieving efficient electrochemical reduction.
Implementation Method 1
the catalyst is an amorphous binary indium bismuth catalyst, wherein the amount of bismuth is in the range of 10-90 wt.%, based on the total amount of bismuth and indium
Implementation Method 2
a gas-diffusion electrode for catalyzed electrochemical reactions, comprising a gas diffusion layer on a conductive substrate
Implementation Method 3
catalyzed electrochemical reactions, in particular for reducing carbon dioxide in order to prepare products or intermediates thereof like carboxylates and/or carboxylic acids
Data Source
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AI summary
A catalyst system for catalyzed electrochemical reactions, in particular the electrochemical conversion of carbon dioxide into valuable chemical products, such as carboxylates and carboxylic acids, comprises a catalyst, wherein the catalyst comprises bismuth and indium. The catalyst system can be a component of a gas diffusion electrode, that can be used as the cathode electrode in an electrochemical cell.