Journal
SMALL
Volume 17, Issue 49, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202104649
Keywords
intercalation capacitance; quantum capacitance; solvent shell; sub-nanometer confined ions
Categories
Funding
- National Natural Science Foundation of China [52077096, 51904216]
- National Key Research and Development Program of China [2020YFA0715000]
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory [XHT2020-003]
- Fundamental Research Funds for the Central Universities [3004131132, WUT: 2019III012GX, 2020III002GX]
Ask authors/readers for more resources
This study investigates the effect of ions intercalated into 2D materials on performance and reveals that the intercalation capacitance arises from the diffusion of solvated ions. The impact of solvation structure on performance can be applied in various electrochemical interface studies, offering a new perspective on energy storage mechanisms.
The ion intercalation behavior in 2D materials is widely applied in energy storage, electrocatalysis, and desalination. However, the detailed effect of ions on the performance, combining the influence of interlayer force and the change of solvent shell, is far less well understood. Here the solvated alkali metal ions with different sizes are intercalated into the lattice of 2D materials with different spacings (Ti3C2Tx, delta-MnO2, and reduced graphene oxide) to construct the intercalation model related with sub-nanometer confined ions and solvent molecules to further understand the intercalation capacitance. Based on electrochemical methods and density functional theory calculation, the ions lose the electrostatic shielding solvent shell or shorten the distance between the layers, resulting in a significant increase in capacitance. It is found that the intercalation capacitance arises from the diffusion of solvated ions and is controlled by quantum and electrochemical capacitance for desolvated ions. This effect of solvation structure on performance can be applied in a variety of electrochemical interface studies and provides a new research view for energy storage mechanisms.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available