What are the disadvantages of high entropy oxides catalyst of OER?
Best insight from top research papers
High entropy oxides (HEOs) used as catalysts for the oxygen evolution reaction (OER) present challenges despite their promising features. One drawback is the difficulty in epitaxial stabilization of thicker films due to the requirement of specific oxidation states, limiting the optimal thickness for enhanced OER activity . Additionally, the high chemical complexity of multimetallic HEO catalysts can hinder the preparation of elemental homogenous catalysts and understanding their synergistic effects during the OER process, complicating their design . While HEOs offer abundant active sites and unique electronic properties, these complexities can pose obstacles in practical applications, requiring further research to overcome these limitations for efficient OER catalysis.
Answers from top 5 papers
More filters
| Papers (5) | Insight |
|---|---|
01 Feb 2022 67 Citations | Not addressed in the paper. |
10 Citations | Not addressed in the paper. |
13 Citations | Not addressed in the paper. |
17 Oct 2022 | The challenges include difficulty in stabilizing thicker films due to nickelate phase decompositions, limiting epitaxial growth, and the need for a specific oxidation state of Ni for optimal OER activity. |
| The paper does not mention any disadvantages of high-entropy oxides catalyst of OER. |
Related Questions
When high-entropy catalysts undergo electrocatalytic reactions, do elements with larger atomic radii tend to leach out into the electrolyte?5 answersHigh-entropy catalysts, such as those based on Ir, Mo, and noble metals, exhibit the ability to inhibit the leaching of elements with larger atomic radii into the electrolyte during electrocatalytic reactions. The use of high-entropy alloys (HEAs) in catalyst design, like ZnNiCoIrMn, FeCoNiMnMo, and Ru-Rh-Pd-Ir-Pt, demonstrates enhanced stability and durability by limiting the dissolution of metals like Mo and Ir. The high-entropy effect in these catalysts significantly reduces the leaching rate of elements, maintaining the integrity of the catalytic layer and preventing the loss of active components into the electrolyte. This characteristic contributes to the long-term performance and efficiency of high-entropy catalysts in various electrocatalytic reactions.
What are the disadvantages of HEOs catalyst of OER?5 answersThe disadvantages of HEOs catalyst for OER include their low abundancy and high cost, which make their application challenging. Additionally, HEOs catalysts, such as RuO2 and IrO2, are considered to be state-of-the-art catalysts for OER, but their limited availability and high cost hinder their widespread use. However, recent research has shown that transition metal-based sulfide and selenide catalysts are more effective for OER and even outperform noble metal oxides. These transition metal-based catalysts have unique electronic structures and electrical conductivity, which contribute to their improved catalytic properties. Therefore, the disadvantages of HEOs catalysts for OER can be overcome by exploring alternative transition metal-based catalysts that are more abundant and cost-effective.
Disadvantage of oxide minerals?5 answersOxide minerals have several disadvantages. One major disadvantage is that the carbothermic reduction process used to obtain metals from oxide minerals produces a significant amount of CO2, contributing to the greenhouse effect. Additionally, nonreducible oxides are chemically inert due to their large band gaps, making them unable to exchange electrons or form bonds with surface species. This limits their reactivity and usefulness in certain applications. Furthermore, advanced atomistic potentials using reactive force fields, which are commonly used to study oxide structures, have been found to have limitations when applied to small systems with low coordinated atoms. These limitations can affect the accuracy of computational methods used to study oxide minerals.
What are the potential applications of high-entropy materials?5 answersHigh-entropy materials (HEMs) have potential applications in various fields. They can be used as advanced electrocatalysts for applications such as oxygen reduction reaction (ORR), oxide evolution reaction (OER), and hydrogen evolution reaction (HER). HEMs also show promise in lithium-sulfur batteries (LSBs) as catalytic materials to improve sulfur utilization and cycling stability. In the field of energy storage, high entropy alloys (HEAs) have been studied for their mechanical, nanomechanical, chemical, and electrochemical properties. HEMs can be used as wear and corrosion-resistant coatings, thermal/environmental barrier coatings, and buffer layers in microelectronics. Additionally, ordered high entropy intermetallic compounds (HEICs) have been developed to address the brittleness of intermetallic compounds at low temperatures. These materials offer unique features such as long-range ordered structures and well-defined multicomponent compositions, which can lead to improved mechanical and functional properties.
Are high entropy metals real?5 answersHigh entropy metals, also known as high entropy alloys (HEAs), are real materials that have emerged as a new class of materials with exceptional scientific and technological potential. The concept of high entropy alloys was first introduced in 2004 by Jien-Wei Yeh and Brian Cantor, who independently announced the discovery of high-entropy alloys and equi-atomic multi-component alloys, respectively. High entropy materials, including high entropy alloys, ceramics, polymers, and hybrids, have the ability to extract strength from their single phase. These materials have a nearly infinite compositional space and can be synthesized using various routes such as liquid-state, solid-state, and gas-state processes. High entropy alloys have been found to exhibit unique properties such as shape memory effect, magnetocaloric effect, and superconductivity. They have also shown potential for various applications in fields such as catalysis, electrochemistry, and joining methods. The concept of high entropy alloys has revolutionized the field of materials science and has opened up new possibilities for the development of advanced materials.
How come the high entropy metal organic framework will have more defect than the one metal center mof?5 answersHigh-entropy metal-organic frameworks (HE-MOFs) are more likely to have defects compared to MOFs with a single metal center. The presence of multiple metals in HE-MOFs introduces disorder and defects in the structure, which can be beneficial for tuning physical properties and enhancing catalytic activity. The incorporation of different metals in HE-MOFs leads to the formation of high-entropy sites, which promote entropy increase effects and drive efficient reactions. On the other hand, MOFs with a single metal center may have fewer defects due to the absence of multiple metal species. Defects in MOFs can be used to tune properties such as gas adsorption, catalysis, and mechanical properties. Therefore, the presence of multiple metals in HE-MOFs increases the likelihood of defects, which can be advantageous for tailoring their properties and enhancing their performance.