{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T04:53:33Z","timestamp":1787028813165,"version":"build-2736575974"},"reference-count":56,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2021,6,29]],"date-time":"2021-06-29T00:00:00Z","timestamp":1624924800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["51872033, 51732007, 52072063"],"award-info":[{"award-number":["51872033, 51732007, 52072063"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Major Scientific and Technological Plan of Yunnan Province","award":["2018ZE001"],"award-info":[{"award-number":["2018ZE001"]}]},{"DOI":"10.13039\/501100012226","name":"Fundamental Research Funds for the Central Universities","doi-asserted-by":"publisher","award":["N180212009"],"award-info":[{"award-number":["N180212009"]}],"id":[{"id":"10.13039\/501100012226","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Rational design and economic fabrication are essential to develop carbonic electrode materials with optimized porosity for high-performance supercapacitors. Herein, nitrogen-doped hollow carbon nanospheres (NHCSs) derived from resorcinol and formaldehyde resin are successfully prepared via a self-template strategy. The porosity and heteroatoms in the carbon shell can be adjusted by purposefully introducing various dosages of ammonium ferric citrate (AFC). Under the optimum AFC dosage (30 mg), the as-prepared NHCS-30 possesses hierarchical architecture, high specific surface area up to 1987 m2\u00b7g\u22121, an ultrahigh mesopore proportion of 98%, and moderate contents of heteroatoms, and these features endow it with a high specific capacitance of 206.5 F\u00b7g\u22121 at 0.2 A\u00b7g\u22121, with a good rate capability of 125 F\u00b7g\u22121 at 20 A\u00b7g\u22121 as well as outstanding electrochemical stability after 5000 cycles in a 6 M KOH electrolyte. Furthermore, the assembled NHCS-30 based symmetric supercapacitor delivers an energy density of 14.1 W\u00b7h\u00b7kg\u22121 at a power density of 200 W\u00b7kg\u22121 in a 6 M KOH electrolyte. This work provides not only an appealing model to study the effect of structural and component change on capacitance, but also general guidance to expand functionality electrode materials by the self-template method.<\/jats:p>","DOI":"10.3390\/ma14133619","type":"journal-article","created":{"date-parts":[[2021,6,29]],"date-time":"2021-06-29T04:31:07Z","timestamp":1624941067000},"page":"3619","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Self-Template Synthesis of Nitrogen-Doped Hollow Carbon Nanospheres with Rational Mesoporosity for Efficient Supercapacitors"],"prefix":"10.3390","volume":"14","author":[{"given":"Xiang","family":"Zhao","sequence":"first","affiliation":[{"name":"Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China"},{"name":"Lab. of Advanced Ceramics, Foshan Graduate School of Northeastern University, Foshan 528311, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mu","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China"},{"name":"Lab. of Advanced Ceramics, Foshan Graduate School of Northeastern University, Foshan 528311, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Pan","sequence":"additional","affiliation":[{"name":"Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China"},{"name":"Lab. of Advanced Ceramics, Foshan Graduate School of Northeastern University, Foshan 528311, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China"},{"name":"Lab. of Advanced Ceramics, Foshan Graduate School of Northeastern University, Foshan 528311, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xudong","family":"Sun","sequence":"additional","affiliation":[{"name":"Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China"},{"name":"Lab. of Advanced Ceramics, Foshan Graduate School of Northeastern University, Foshan 528311, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,6,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"14465","DOI":"10.1021\/jacs.5b09572","article-title":"Evolutionary design of low molecular weight organic anolyte materials for applications in nonaqueous redox flow batteries","volume":"137","author":"Sevov","year":"2015","journal-title":"J. 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