Development of Heteroatomic Constant Potential Method with Application to MXene-Based Supercapacitors

Xiaobo Lin, Shern R. Tee, Paul R.C. Kent, Debra J. Searles, Peter T. Cummings

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We describe a method for modeling constant-potential charges in heteroatomic electrodes, keeping pace with the increasing complexity of electrode composition and nanostructure in electrochemical research. The proposed “heteroatomic constant potential method” (HCPM) uses minimal added parameters to handle differing electronegativities and chemical hardnesses of different elements, which we fit to density functional theory (DFT) partial charge predictions in this paper by using derivative-free optimization. To demonstrate the model, we performed molecular dynamics simulations using both HCPM and conventional constant potential method (CPM) for MXene electrodes with Li-TFSI/AN (lithium bis(trifluoromethane sulfonyl)imide/acetonitrile)-based solvent-in-salt electrolytes. Although the two methods show similar accumulated charge storage on the electrodes, the results indicated that HCPM provides a more reliable depiction of electrode atom charge distribution and charge response compared with CPM, accompanied by increased cationic attraction to the MXene surface. These results highlight the influence of elemental composition on electrode performance, and the flexibility of our HCPM opens up new avenues for studying the performance of diverse heteroatomic electrodes including other types of MXenes, two-dimensional materials, metal-organic frameworks (MOFs), and doped carbonaceous electrodes.

Original languageEnglish
Pages (from-to)651-664
Number of pages14
JournalJournal of Chemical Theory and Computation
Volume20
Issue number2
DOIs
StatePublished - Jan 23 2024

Funding

X.L., P.R.C.K., and P.T.C. gratefully acknowledge the support provided by the Fluid Interface Reactions, Structures and Transport (FIRST) Center, which is an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. They also extend their appreciation to the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility located at Lawrence Berkeley National Laboratory, for generously providing the computational resources essential to this research. S.R.T. and D.J.S. express their appreciation to the Australian Research Council for its support through the Discovery program (FL19010008) and gratefully acknowledge the Pawsey Supercomputing Research Centre and the University of Queensland’s Research Computing Centre (RCC) for its support in this research by providing computational resources. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( https://www.energy.gov/doe-public-access-plan ). X.L., P.R.C.K., and P.T.C. gratefully acknowledge the support provided by the Fluid Interface Reactions, Structures and Transport (FIRST) Center, which is an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences. They also extend their appreciation to the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility located at Lawrence Berkeley National Laboratory, for generously providing the computational resources essential to this research. S.R.T. and D.J.S. express their appreciation to the Australian Research Council for its support through the Discovery program (FL19010008) and gratefully acknowledge the Pawsey Supercomputing Research Centre and the University of Queensland’s Research Computing Centre (RCC) for its support in this research by providing computational resources. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (https://www.energy.gov/doe-public-access-plan).

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