Relevance of metal (Ca versus Mn) embedded C2N for energy-storage applications: Atomic-scale study

Saba Khan, Muhammad Mushtaq, Golibjon R. Berdiyorov, Nacir Tit

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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 languageEnglish
Pages (from-to)2445-2463
Number of pages19
JournalInternational Journal of Hydrogen Energy
Issue number2
Publication statusPublished - Jan 6 2021


  • 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


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