Lanthanide Oxide–Gold Heterostructures for Selective CO2 Reduction
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Solution Overview
Problem
Existing noble metal nanomaterials face challenges in achieving highly efficient and selective carbon dioxide reduction to a single product, particularly in a broad potential window, due to weak adsorption of CO2 molecules on their surfaces.
Innovation Solution
A heterostructured electrocatalyst is developed, comprising a lanthanide oxide nanomaterial, such as cerium oxide, deposited on a gold-containing nanosupport with a specific crystal phase and oxidation state, forming a metal-oxide interface that enhances the electrocatalytic performance for carbon dioxide reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noble metal nanomaterials are used for electrocatalytic CO2RR, then CO production is achieved, but the adsorption of CO2 molecules on the metal surfaces is weak, resulting in low efficiency and selectivity
Solution Approach 1:
The patent creates a heterostructured electrocatalyst by depositing lanthanide oxide nanomaterials (such as cerium oxide) on gold-containing nanosupport. This composite structure combines the properties of both materials: the noble metal provides catalytic activity while the lanthanide oxide enhances CO2 adsorption through its basic surface properties and oxygen vacancies, resolving the contradiction between weak adsorption and low efficiency
Solution Approach 2:
The patent modifies specific local regions of the catalyst by creating metal-oxide interfaces through controlled deposition of lanthanide oxide nanoparticles on gold nanosupport. The interface regions possess unique electronic structures and surface properties that enhance both CO2 adsorption strength and activation, while maintaining the overall catalytic functionality of the noble metal
2Adaptability or versatility
If noble metal nanomaterials are used for CO2 reduction, then CO production is achieved, but high efficiency and selectivity to a single product cannot be achieved in a broad potential window
Solution Approach 1:
The patent changes the surface chemical properties of the catalyst by introducing lanthanide oxide with specific oxidation states (+3 or +4) and crystal phases (such as fluorite structure). These parameter changes in surface basicity, oxygen vacancy concentration, and electronic structure enable the catalyst to maintain high CO selectivity across a broader potential window by facilitating CO2 activation and CO desorption at multiple operating conditions
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 heterostructured electrocatalyst achieves high selectivity and efficiency in producing carbon monoxide, with Faradaic efficiency exceeding 97% and a partial current density of 9.7 mA cm−2, optimizing the CO2 reduction process.
Implementation Method 1
because of the weak adsorption of CO2 molecules on nobel metal surfaces
Implementation Method 2
Electronic structure modulation of metal nanomaterials by introducing a lanthanide oxide (LnOx) to the metal
Implementation Method 3
the electrocatalytic CO2 reduction reaction (CO2RR)
Data Source
AI summary
A heterostructured electrocatalyst for carbon dioxide reduction reaction includes a lanthanide oxide nanomaterial deposited on a gold-containing nanosupport. A method of preparing the heterostructured electrocatalyst and use of the heterostructured electrocatalyst in an electrode are also addressed.