A Theoretical Model for the Charging Dynamics of Associating Ionic Liquids

• DOI: 10.3389/fceng.2022.852070
• Publication Date: 2022-04-13T13:51:52Z
• Authors: Jin Cheng; Haolan Tao; Ke Ma; Jie Yang; Cheng Lian; Honglai Liu; Jianzhong Wu
• Keywords: Technology; ion association; electrical double layer; T; Chemical technology; room-temperature ionic liquids; charging dynamics; TP1-1185; Poisson-Nernst-Planck (PNP) equations; 01 natural sciences; 0104 chemical sciences

Association between cations and anions plays an important role in the interfacial structure of room-temperature ionic liquids (ILs) their electrochemical performance. Whereas great efforts have been devoted to investigating association effect on equilibrium properties ILs, a molecular-level understanding charging dynamics is yet be established. Here, we propose theoretical procedure combining reaction kinetics modified Poisson-Nernst-Planck (MPNP) equations study influences electrical double layer (EDL) response applied voltage. The introduces new decay length λ S relaxation time scale <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="m1"><mml:mrow><mml:msub><mml:mi>τ</mml:mi><mml:mrow><mml:mi>R</mml:mi><mml:mi>C</mml:mi></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:mrow><mml:mrow><mml:msub><mml:mi>λ</mml:mi><mml:mi>S</mml:mi></mml:msub><mml:mi>L</mml:mi></mml:mrow><mml:mo>/</mml:mo><mml:mi>D</mml:mi></mml:mrow></mml:mrow></mml:math> , where L system size D ion diffusivity, that are distinctively different those corresponding non-associative systems. Analytical expressions obtained reveal quantitative relations dynamic timescales strength.