Single-Atom Alloy Water Splitting Catalyst for Low-Overpotential OER
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Solution Overview
Problem
The high energy consumption and requirement for precious metals in oxygen evolution reactions (OER) in water splitting, along with the instability of single-atom catalysts, hinder the commercialization of water electrolysis.
Innovation Solution
A water splitting catalyst comprising a porous carbon layer with a bimetallic metal alloy core and a single-atom precious metal dispersed on its surface, stabilized by adsorbed oxygen, which facilitates the OER by reducing the kinetic energy barrier and stabilizing intermediates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RuO2 or IrO2 anode is used for oxygen evolution reaction, then catalytic activity is improved, but cost increases due to precious metal requirement
Solution Approach 1:
The catalyst is segmented into a core-shell structure where a non-precious metal core (Fe, Co, Ni, Cu, Mn, or Zn) is coated with a thin layer of precious metal (Ru, Ir, Rh, Pd, Ag, Au, or Pt). This segmentation allows the precious metal to be distributed on the surface rather than used throughout the entire catalyst, significantly reducing the quantity of precious metal required while maintaining high catalytic activity for the oxygen evolution reaction.
Solution Approach 2:
The invention uses a composite catalyst structure combining non-precious metal and precious metal in a core-shell configuration. The non-precious metal core provides structural support and cost reduction, while the precious metal shell provides the necessary catalytic activity. This composite approach resolves the contradiction by integrating materials with complementary properties.
2Quantity of substance
If single-atom catalyst is used to reduce precious metal, then cost is reduced, but stability deteriorates due to weak interaction with support
Solution Approach 1:
The invention merges the advantages of single-atom catalysts (low precious metal usage) with bulk catalysts (high stability) by creating a core-shell structure. The non-precious metal core provides stable structural support, while the precious metal atoms on the surface maintain low cost. This combining approach resolves the contradiction by integrating the stability of bulk materials with the cost-effectiveness of single-atom catalysts.
Solution Approach 2:
The non-precious metal core acts as an intermediary that supports the precious metal atoms on the surface. This intermediary structure provides mechanical stability and prevents the precious metal atoms from aggregating or detaching, while still allowing the precious metal to function as an effective catalyst. The intermediary core thus enables the use of minimal precious metal without sacrificing stability.
3Productivity
If water splitting reaction is carried out, then hydrogen and oxygen are produced, but energy consumption increases due to high overpotential
Solution Approach 1:
The invention changes the catalytic parameters by using a core-shell structure with specific non-precious metal cores (Fe, Co, Ni, Cu, Mn, or Zn) and precious metal shells (Ru, Ir, Rh, Pd, Ag, Au, or Pt). This parameter change in the catalyst composition and structure optimizes the oxygen evolution reaction, reducing the overpotential and thereby decreasing the energy consumption required for water splitting while maintaining high productivity.
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 catalyst achieves a lower overpotential and improved stability, reducing the energy required for oxygen evolution and enhancing the water splitting reaction efficiency.
Implementation Method 1
a single-atom precious metal dispersed on the bimetallic metal alloy core, in which oxygen is adsorbed on the surface of the bimetallic metal alloy core
Implementation Method 2
oxygen is adsorbed on the surface of the bimetallic metal alloy core
Implementation Method 3
a porous carbon layer, a bimetallic metal alloy core dispersed on the porous carbon layer
Data Source
AI summary
The present disclosure relates to a water splitting catalyst including a porous carbon layer, a bimetallic metal alloy core dispersed on the porous carbon layer, and a single-atom precious metal dispersed on the bimetallic metal alloy core, in which oxygen is adsorbed on the surface of the bimetallic metal alloy core.