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. 2018 Oct 9;9:4164. doi: 10.1038/s41467-018-06629-9

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© The Author(s) 2018

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. 4 — Integrate black phosphorus quantum dots with porous carbon/sulfur cathodes. a Transmission electron microscopy (TEM) image of the porous carbon nanofiber (PCNF) consisting of numerous hollow carbon spheres, b TEM image of the porous carbon host in a filled with sulfur particles and black phosphorus quantum dot (BPQD), designated as PCNF/S/BPQD, c high-resolution TEM (HRTEM) image showing the graphitic carbon layers of the PCNF and the uniform dispersion of BPQD within PCNF/S/BPQD, d scanning tunneling electron microscopy (STEM) image and energy dispersive spectroscopy (EDS) elemental mapping of the PCNF/S/BPQD fibers, e–g TEM images captured during lithiation of a PCNF/S/BPQD fiber, the red arrow in f refers to the reaction front, h, i selected area electron diffraction (SAED) patterns of the selected area with white circles in e and g, respectively. Scale bars, 100 nm (a); 200 nm (b); 10 nm (c); 2 nm inset (c); 500 nm (d); 200 nm (e–g)