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\n In this paper we propose and analyze a finite difference numerical scheme for the Poisson-Nernst-Planck equation (PNP) system. To understand the energy structure of the PNP model, we make use of the Energetic Variational Approach (EnVarA), so that the PNP system could be reformulated as a non-constant mobility\n \n \n \n \n H<\/mml:mi>\n \n \n \u2212\n \n <\/mml:mo>\n 1<\/mml:mn>\n <\/mml:mrow>\n <\/mml:msup>\n H^{-1}<\/mml:annotation>\n <\/mml:semantics>\n <\/mml:math>\n <\/inline-formula>\n gradient flow, with singular logarithmic energy potentials involved. To ensure the unique solvability and energy stability, the mobility function is explicitly treated, while both the logarithmic and the electric potential diffusion terms are treated implicitly, due to the convex nature of these two energy functional parts. The positivity-preserving property for both concentrations,\n \n \n \n n<\/mml:mi>\n n<\/mml:annotation>\n <\/mml:semantics>\n <\/mml:math>\n <\/inline-formula>\n and\n \n \n \n p<\/mml:mi>\n p<\/mml:annotation>\n <\/mml:semantics>\n <\/mml:math>\n <\/inline-formula>\n , is established at a theoretical level. This is based on the subtle fact that the singular nature of the logarithmic term around the value of\n \n \n \n 0<\/mml:mn>\n 0<\/mml:annotation>\n <\/mml:semantics>\n <\/mml:math>\n <\/inline-formula>\n prevents the numerical solution reaching the singular value, so that the numerical scheme is always well-defined. In addition, an optimal rate convergence analysis is provided in this work, in which many highly non-standard estimates have to be involved, due to the nonlinear parabolic coefficients. The higher order asymptotic expansion (up to third order temporal accuracy and fourth order spatial accuracy), the rough error estimate (to establish the\n \n \n \n \n \n \u2113\n \n <\/mml:mi>\n \n \u221e\n \n <\/mml:mi>\n <\/mml:msup>\n \\ell ^\\infty<\/mml:annotation>\n <\/mml:semantics>\n <\/mml:math>\n <\/inline-formula>\n bound for\n \n \n \n n<\/mml:mi>\n n<\/mml:annotation>\n <\/mml:semantics>\n <\/mml:math>\n <\/inline-formula>\n and\n \n \n \n p<\/mml:mi>\n p<\/mml:annotation>\n <\/mml:semantics>\n <\/mml:math>\n <\/inline-formula>\n ), and the refined error estimate have to be carried out to accomplish such a convergence result. In our knowledge, this work will be the first to combine the following three theoretical properties for a numerical scheme for the PNP system: (i) unique solvability and positivity, (ii) energy stability, and (iii) optimal rate convergence. A few numerical results are also presented in this article, which demonstrates the robustness of the proposed numerical scheme.\n <\/p>","DOI":"10.1090\/mcom\/3642","type":"journal-article","created":{"date-parts":[[2021,2,17]],"date-time":"2021-02-17T11:25:02Z","timestamp":1613561102000},"page":"2071-2106","source":"Crossref","is-referenced-by-count":81,"title":["A positivity-preserving, energy stable and convergent numerical scheme for the Poisson-Nernst-Planck system"],"prefix":"10.1090","volume":"90","author":[{"given":"Chun","family":"Liu","sequence":"first","affiliation":[]},{"given":"Cheng","family":"Wang","sequence":"additional","affiliation":[]},{"given":"Steven","family":"Wise","sequence":"additional","affiliation":[]},{"given":"Xingye","family":"Yue","sequence":"additional","affiliation":[]},{"given":"Shenggao","family":"Zhou","sequence":"additional","affiliation":[]}],"member":"14","published-online":{"date-parts":[[2021,6,15]]},"reference":[{"issue":"5","key":"1","doi-asserted-by":"publisher","first-page":"2851","DOI":"10.1137\/120880677","article-title":"Convergence analysis of a second order convex splitting scheme for the modified phase field crystal equation","volume":"51","author":"Baskaran, A.","year":"2013","journal-title":"SIAM J. 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