K3CoO2
K3CoO2 is a stable, semiconducting oxide material utilized primarily in the study of oxygen-evolution catalysis for electrochemical applications.
About K3CoO2
K3CoO2 is a semiconducting oxide that sits firmly on the thermodynamic convex hull, indicating robust stability. As a member of the oxygen-evolution catalyst class, it plays a critical role in electrochemical research aimed at improving energy conversion efficiency. Its unique electronic structure allows it to participate in complex surface reactions essential for water splitting and related catalytic processes. By maintaining structural integrity under operational conditions, this compound serves as a reliable candidate for investigating the fundamental mechanisms of oxygen evolution. Its stability makes it an intriguing subject for researchers looking to optimize catalytic performance in electrochemical cells.
Key Properties
Cross-validated computational properties for K3CoO2, aggregated across 3 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Reported Structures
Lowest-energy structures reported for K3CoO2, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| Pnma (No. 62) | orthorhombic | 1.63 | 0.0000 | -4.649 | 2.70 |
| No. 0 | unknown | — | — | — | 0.67 |
| Pnma (No. 62) | Orthorhombic | — | — | — | 2.70 |
| Pnma (No. 62) | Orthorhombic | — | — | — | 2.59 |
| Pnma (No. 62) | Orthorhombic | — | — | — | 2.65 |
Applications
Where K3CoO2 is used.
Frequently Asked Questions
Common questions about K3CoO2, answered from cross-validated data.
What is K3CoO2?
K3CoO2 is a stable, semiconducting oxide material utilized primarily in the study of oxygen-evolution catalysis for electrochemical applications.
What is K3CoO2 used for?
What is the band gap of K3CoO2?
Is K3CoO2 a metal, semiconductor, or insulator?
Is K3CoO2 thermodynamically stable?
What is the crystal structure of K3CoO2?
What is the density of K3CoO2?
How many polymorphs of K3CoO2 are known?
What elements does K3CoO2 contain?
Where does the data for K3CoO2 come from?
How It Compares
Within the oxide oxygen-evolution catalysts class.
While many members of this class, such as LiCoO2 and LiNiO2, are widely recognized for their roles in battery cathode technology, K3CoO2 is specifically positioned as a specialized oxide catalyst. Unlike the more common perovskite-structured materials like LaMnO3 or LaNiO3, this compound exhibits a distinct structural arrangement that influences its catalytic activity, providing a unique alternative to the well-studied spinel-type LiMn2O4 or the simple binary NiO.
Related Compounds
Other Oxide Oxygen-Evolution Catalysts in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
- mpaloe — Data from mpaloe.
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