Related Experiment Video
Updated: Sep 4, 2025
11:10
Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
12.0K
Reversible and rapid calcium intercalation into molybdenum vanadium oxides
Aniruddha S Lakhnot1, Kevin Bhimani1, Varad Mahajani2
1Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180.
Summary
Researchers developed an aqueous calcium-ion battery using molybdenum vanadium oxide (MoVO) polymorphs. Orthorhombic and trigonal MoVO structures show superior performance for calcium-ion storage, offering a promising alternative to lithium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Lithium-ion batteries face challenges due to resource scarcity, cost, and safety concerns.
- Calcium-ion batteries offer a sustainable alternative due to calcium's abundance and low cost.
- Challenges in calcium-ion battery development include ion diffusion kinetics and cyclic stability due to calcium ion properties.
Purpose of the Study:
- To demonstrate an aqueous calcium-ion battery system.
- To investigate molybdenum vanadium oxide (MoVO) polymorphs as host materials for calcium ions.
- To evaluate the performance of different MoVO crystal structures in calcium-ion storage.
Main Methods:
- Synthesis and characterization of orthorhombic, trigonal, and tetragonal MoVO polymorphs.
- Assembly and testing of aqueous calcium-ion battery cells using MoVO electrodes.
- Electrochemical performance evaluation, including capacity, rate capability, and cyclic stability.
Main Results:
- Orthorhombic and trigonal MoVO polymorphs exhibited superior performance compared to the tetragonal structure.
- The presence of hexagonal and heptagonal tunnels in trigonal and orthorhombic MoVO facilitated efficient calcium-ion diffusion.
- Trigonal MoVO achieved a specific capacity of ~203 mAh g⁻¹ at 0.2C and ~60 mAh g⁻¹ at 20C.
- These MoVO polymorphs demonstrated good cyclic stability and reversibility.
Conclusions:
- Molybdenum vanadium oxide (MoVO) shows significant potential as a cathode material for aqueous calcium-ion batteries.
- The trigonal and orthorhombic polymorphs of MoVO are particularly promising due to their open tunnel structures.
- MoVO-based calcium-ion batteries represent a competitive advancement in energy storage technology, offering high performance and stability.
Related Concept Videos
01:25MOS Capacitor
942
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
942
02:58Properties of Transition Metals
27.0K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
27.0K
03:02Colors and Magnetism
12.3K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.3K