Abstract
The suitability of embedding metal atoms (Ca versus Mn) in the pores of C2N to be employed as the anode material for metal-ion battery applications is studied using density-functional theory. The effect of single-atom catalyst (SAC) versus dimer-atom catalyst (DAC) on the uptake catalyst capacity is put under focus. Our results show that both metal atoms exhibit very strong interactions with the pyridinic-nitrogen pore and show the ability of the pore to accommodate either a single Ca atom or a dimer of Mn atoms within its membrane-plane. While the theoretical irreducible capacitance in case of SAC Ca catalyst is limited to about 200 mAhg−1, it can exceed this value in case of DAC-Mn catalyst to reach 1110 mAhg−1. Regarding the adsorption, the H2 molecule exhibits strong physisorption on Ca-catalyst and moderate chemisorption on Mn-catalyst, with an adsorption energy increasing from SAC to DAC cases. The SAC of Mn is found not only concurrent candidate to Ca for energy-storage applications but further promising for platform of reusable hydrogen gas-sensors with very low recovery time (i.e., τ « 1 s). Our findings are in good agreement with the available experimental data and theoretical results.
Original language | English |
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Pages (from-to) | 2445-2463 |
Number of pages | 19 |
Journal | International Journal of Hydrogen Energy |
Volume | 46 |
Issue number | 2 |
DOIs | |
Publication status | Published - Jan 6 2021 |
Keywords
- Adsorption kinetics
- Chemisorption/physisorption: adsorbates on surfaces
- Density-functional theory
- Energy-storage
- Gas-sensing
- Graphene and related materials
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology