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. 2020 Aug 28;11:4346. doi: 10.1038/s41467-020-18212-2

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — a and b Heat flow of LI-P nanofiber junction #1 under the forward and reverse biases at environmental temperatures T = 440 K and T = 390 K, respectively. At a higher working temperature in a, LI-P nanofiber junction #1 shows positive rectification. At a lower working temperature in b, LI-P nanofiber junction #1 shows negative rectification, i.e., heat flow in the forward direction is lower than that in the reverse direction. c Dual-mode rectification as a function of environmental temperature. The thermal rectification factor R is calculated with temperature biases ΔT that are 3 K and 2 K over the phase transition temperatures in a and b, respectively. The error bar of rectification is calculated from least-square fitting of the heat flow curve, which is elaborated in Supplementary Note 8.