Strain-tunable CO2 storage by black phosphorene and α-PC from combined first principles and molecular dynamics studies

Literature Information

Publication Date 2019-08-19
DOI 10.1039/C9CP03676H
Impact Factor 3.676
Authors

Xiaohan Song, Yang Liu, Yanmei Yang, Weifeng Li, Mingwen Zhao


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Abstract

2D layered materials are intrinsically promising mediums for gas adsorption because of their recognized large surface areas and structural stability. Their gas adsorption and desorption processes are usually controlled by changing the temperature or applying high voltage. In this work, though combined density functional theory (DFT) calculations and molecular dynamics (MD) simulations, we propose that external tensile strain can also regulate the gas binding energetics and kinetics using two representative 2D materials, monolayer black phosphorene (BP) and black phosphorus carbide (α-PC), as showpiece models. The DFT results clearly show that CO2 can be physically adsorbed on BP/α-PC with moderate binding strength, which facilities the adsorption and desorption processes. For BP, strain increases the storage capacity from 10.90 ± 0.28 mmol g−1 (strain free) to 12.67 ± 0.33 (30% strain) with a tunability of 16.2%. α-PC, however, has a smaller strain response; its CO2 storage capacity increases from 15.98 ± 0.34 mmol g−1 (strain free) to 17.15 ± 0.36 mmol g−1 for a 10% strained state. DFT calculations reveal that CO2 is an electron acceptor for both BP and α-PC; however, it hardly regulates their electronic structures. The theoretical investigations suggest that BP and α-PC have great potential as gas capture and storage materials. The strain controlling approach can be generalized for the design of tunable nano-devices by external mechanical stimuli.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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