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In this paper, cheap and abundant watermelon peel was used as a raw material to successfully synthesize nitrogen-phosphorus double-doped bio-based porous carbon by a one-step carbonization method and explore it as a renewable carbon source for low-cost energy storage devices. The supercapacitor electrode exhibited a high specific capacity of 135.2 F\/g at a current density of 1 A\/g in a three-electrode system. A variety of characterization methods and electrochemical tests indicate that porous carbon prepared by this simple method has great potential as electrode materials for supercapacitors.<\/jats:p>","DOI":"10.3390\/mi14051003","type":"journal-article","created":{"date-parts":[[2023,5,8]],"date-time":"2023-05-08T01:32:53Z","timestamp":1683509573000},"page":"1003","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Preparation of Nitrogen and Phosphorus Doped Porous Carbon from Watermelon Peel as Supercapacitor Electrode Material"],"prefix":"10.3390","volume":"14","author":[{"given":"Chi","family":"Yang","sequence":"first","affiliation":[{"name":"College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7071-6547","authenticated-orcid":false,"given":"Penghui","family":"Li","sequence":"additional","affiliation":[{"name":"College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China"},{"name":"Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yumeng","family":"Wei","sequence":"additional","affiliation":[{"name":"College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanting","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bo","family":"Jiang","sequence":"additional","affiliation":[{"name":"College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China"},{"name":"Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenjuan","family":"Wu","sequence":"additional","affiliation":[{"name":"College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing 210037, China"},{"name":"Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,5,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"27","DOI":"10.1016\/j.mser.2018.10.004","article-title":"Composite solid electrolytes for all-solid-state lithium batteries","volume":"136","author":"Dirican","year":"2019","journal-title":"Mater. 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