{"title":"Activated carbon derived from corncob via hydrothermal carbonization as a promising electrode for supercapacitors","authors":"","doi":"10.1016/j.materresbull.2024.112991","DOIUrl":null,"url":null,"abstract":"<div><p>Activated carbon has been synthesized from corncob via hydrothermal treatment at 200 °C for 7 h with and without activating agents, followed by carbonization at 400 °C for 3 h. The X-ray diffraction patterns show peaks corresponding to the amorphous and graphitic carbon phases. The SEM studies reveal <em>meso</em> and macro pores. The H<sub>3</sub>PO<sub>4</sub> treated sample (CC-H-400) shows the highest Brunauer-Emmett-Teller surface area (68.54 m<sup>2</sup> g<sup>-1</sup>). Raman spectra indicate the typical D and G bands. The CC-H-400 shows the highest specific capacitance value of 41 F g<sup>-1</sup> among all the samples. The energy and power density values of the supercapacitor working electrode in a three-electrode setup are 5.7 W h kg<sup>-1</sup> and 500.4 W kg<sup>-1</sup>, respectively, for the CC-H-400. Furthermore, the CC-H-400 exhibits excellent stability with a retention rate of 88 % after 2000 charge-discharge cycles at 10 A g<sup>-1</sup> without any shape change, as well as a low equivalence series resistance (ESR) value of 3.96 Ω.</p></div>","PeriodicalId":18265,"journal":{"name":"Materials Research Bulletin","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Research Bulletin","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0025540824003222","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Activated carbon has been synthesized from corncob via hydrothermal treatment at 200 °C for 7 h with and without activating agents, followed by carbonization at 400 °C for 3 h. The X-ray diffraction patterns show peaks corresponding to the amorphous and graphitic carbon phases. The SEM studies reveal meso and macro pores. The H3PO4 treated sample (CC-H-400) shows the highest Brunauer-Emmett-Teller surface area (68.54 m2 g-1). Raman spectra indicate the typical D and G bands. The CC-H-400 shows the highest specific capacitance value of 41 F g-1 among all the samples. The energy and power density values of the supercapacitor working electrode in a three-electrode setup are 5.7 W h kg-1 and 500.4 W kg-1, respectively, for the CC-H-400. Furthermore, the CC-H-400 exhibits excellent stability with a retention rate of 88 % after 2000 charge-discharge cycles at 10 A g-1 without any shape change, as well as a low equivalence series resistance (ESR) value of 3.96 Ω.
活性碳是由玉米芯经 200 °C 水热处理 7 小时(含或不含活化剂)合成的,然后在 400 °C 下碳化 3 小时。扫描电镜研究显示了中孔和大孔。经 H3PO4 处理的样品(CC-H-400)显示出最高的布鲁瑙尔-埃美特-泰勒表面积(68.54 m2 g-1)。拉曼光谱显示出典型的 D 和 G 波段。在所有样品中,CC-H-400 的比电容值最高,为 41 F g-1。在三电极设置中,CC-H-400 的超级电容器工作电极的能量和功率密度值分别为 5.7 W h kg-1 和 500.4 W kg-1。此外,CC-H-400 还具有出色的稳定性,在 10 A g-1 的条件下经过 2000 次充放电循环后,保持率达到 88%,且形状未发生任何变化,等效串联电阻 (ESR) 值也很低,仅为 3.96 Ω。
期刊介绍:
Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.