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玉米芯基碳点电化学法制备及其储钠性能

李瑞林 赵宗彬 冷昌宇 李勇 艾李申 孙洋 王旭珍 邱介山

李瑞林, 赵宗彬, 冷昌宇, 李勇, 艾李申, 孙洋, 王旭珍, 邱介山. 玉米芯基碳点电化学法制备及其储钠性能. 新型炭材料(中英文), 2023, 38(2): 347-355. doi: 10.1016/S1872-5805(22)60644-9
引用本文: 李瑞林, 赵宗彬, 冷昌宇, 李勇, 艾李申, 孙洋, 王旭珍, 邱介山. 玉米芯基碳点电化学法制备及其储钠性能. 新型炭材料(中英文), 2023, 38(2): 347-355. doi: 10.1016/S1872-5805(22)60644-9
LI Rui-lin, ZHAO Zong-bin, LENG Chang-yu, LI Yong, AI Li-shen, SUN Yang, WANG Xu-zhen, QIU Jie-shan. Preparation of carbon dots from carbonized corncobs by electrochemical oxidation and their application in Na-batteries. New Carbon Mater., 2023, 38(2): 347-355. doi: 10.1016/S1872-5805(22)60644-9
Citation: LI Rui-lin, ZHAO Zong-bin, LENG Chang-yu, LI Yong, AI Li-shen, SUN Yang, WANG Xu-zhen, QIU Jie-shan. Preparation of carbon dots from carbonized corncobs by electrochemical oxidation and their application in Na-batteries. New Carbon Mater., 2023, 38(2): 347-355. doi: 10.1016/S1872-5805(22)60644-9

玉米芯基碳点电化学法制备及其储钠性能

doi: 10.1016/S1872-5805(22)60644-9
基金项目: 国家自然科学基金(52172038,22179017,U1610105)。
详细信息
    作者简介:

    李瑞林,硕士研究生.E-mail:ruilinli2019@163.com

    通讯作者:

    赵宗彬,教授. E-mail:zbzhao@dlut.edu.cn

    邱介山,教授. E-mail:jqiu@dlut.edu.cn

  • 中图分类号: TQ127.1+1

Preparation of carbon dots from carbonized corncobs by electrochemical oxidation and their application in Na-batteries

Funds: National Natural Science Foundation of China (52172038, 22179017, U1610105).
More Information
  • 摘要: 碳点(CDs)是一种新兴的碳纳米材料,因其高比表面积、良好的分散性、丰富的表面官能团、低生物毒性和光致发光特性而受到了研究者的广泛关注。然而,低成本、大规模和绿色合成CDs仍面临挑战。本工作基于生物质玉米芯特殊的天然孔隙结构,经直接炭化制备具有定向、贯通微纳米孔道的多孔三维电极材料,在毛细作用下电解液可以充满整个电极材料,内外表面同时发生电化学氧化,实现高效制备CDs。在1 A恒电流下,每克电极材料制备CDs速率达到了79.83 mg h−1。将制备的CDs与氧化石墨烯(GO)水热复合得到复合气凝胶CDs/rGO材料,经热处理后应用于钠离子电池。在1 A g−1下循环1000圈仍保持263.3 mAh g−1的容量。本研究工作采用生物质玉米芯高效制备CDs,为CDs的大规模绿色制备和应用提供了新的途径和思路。
  • FIG. 2238.  FIG. 2238.

    FIG. 2238..  FIG. 2238.

    图  1  碳点的制备过程示意图

    Figure  1.  Illustration diagram of carbon dot preparation process

    图  2  (a) 玉米芯截面;(b-d) 炭化玉米芯各部分刻蚀前的SEM照片:(b) 中心;(c) 鞘;(d) 外层薄片;(e) 炭化玉米芯刻蚀后轴向剖面;(f-h) 玉米芯各部分刻蚀前的SEM照片:(f) 中心;(g) 鞘;(h) 外层薄片

    Figure  2.  (a) Cross-section of corncob; (b-d) SEM images of carbonized corncob before etching; (b) center; (c) sheath; (d) sheet; (e) Longitudinal section of carbonized corncob after etching; (f-h) SEM images of carbonized corncob after etching; (f) center; (g) sheath; (h) sheet

    图  3  (a) 制备得到的CDs粉末数码照片;(b) 大批量制备的CDs水分散液;(c-d) CDs的TEM照片;(e) 炭化玉米芯尾端(10%)浸在电解液中液体上移的红外照片

    Figure  3.  (a) Digital picture of CDs powder; (b) Aqueous dispersion of CDs; (c-d) TEM images of CDs; (e) Infrared image of carbonized corncob with tail immersed in electrolyte

    图  4  (a) CDs荧光谱图;(b) CDs和炭化玉米芯(800°C)的XRD谱图;(c) CDs和炭化玉米芯(800 °C)的FTIR光谱图;(d) CDs和炭化玉米芯(800 °C)的XPS谱图;(e) CDs的C1s XPS谱图;(f)炭化玉米芯(800 °C)的C1s XPS谱图

    Figure  4.  (a) Fluorescence spectra of CDs; (b) XRD patterns of CDs and CC-800; (c) FTIR spectra of CDs and CC-800; (d) XPS survey spectra of CDs and CC-800; (e) XPS survey spectra of C1s for CDs; (f) XPS survey spectra of C1s for CC-800

    图  5  (a) 不同电解液中CDs制备速率图;(b) 不同炭化温度玉米芯电化学制备CDs电压-时间曲线;(c) 不同炭化温度玉米芯XRD谱图;(d-g) 不同炭化温度玉米芯制备CDs 的TEM图:(d) 700 °C,(e) 800 °C,(f) 900 °C,(g) 1000 °C;(h-k) 不同炭化温度玉米芯制备的CDs尺寸统计图:(h) 700 °C,(i) 800 °C,(j) 900 °C,(k) 1000 °C

    Figure  5.  (a) Preparation rates of CDs with different electrolytes; (b) Volt-time curve of electrochemical preparation of CDs from CC-T; (c) XRD patterns of CC-T; TEM images of CDs from CC-T: (d) 700 °C, (e) 800 °C, (f) 900 °C, (g) 1000 °C; (h-k) CDs size statistics from CC-T: (h) 700 °C, (i) 800 °C, (j) 900 °C, (k) 1000 °C

    图  6  (a) 不同含量CDs的CDs/rGO复合气凝胶数码照片;(b) rGO的TEM、(c) CDs/rGO-4的TEM照片

    Figure  6.  (a) Digital photos of CDs/rGO aerogel with different contents of CDs; TEM image of (b) rGO and (c) CDs/rGO-4

    图  7  (a) CDs/rGO-4-H的CV曲线;(b) CDs/rGO-4-H的充放电曲线;(c) 不同CDs与rGO复合比例材料的倍率性能图;(d) 不同CDs与rGO复合比例材料的交流阻抗图;(e) CDs/rGO-4-H在1 A g−1下循环性能图

    Figure  7.  (a) CV curves of CDs/rGO-4-H; (b) the charge-discharge curves of CDs/rGO-4-H; (c) Ratio performance of materials with different CDs and rGO composite ratio; (d) Nyquist impedance plot of materials with different CDs and rGO composite ratios; (e) Cyclic performance of CDs/rGO-4-H at 1 A g−1

    表  1  本研究结果与报道的石墨烯基钠离子电池负极材料性能比较

    Table  1.   Comparison of the results in this study with reported performance of the graphenebased cathode materials for sodium-ion batteries

    SampleRate capability (mAh g−1)/
    current density (A g−1)
    Cyclic stability (mAh g−1)/
    current density (A g−1)
    Ref.
    CDs/rGO aerogel359.0 / 0.1
    268.0 / 5
    263.3 / 1
    after 1000 cycles
    This work
    Expanded graphite284 / 0.02
    91 / 0.2
    136 / 0.1
    after 2000 cycles
    [31]
    Graphene oxide nanosheets220 / 0.03
    105 / 5
    150 / 0.1
    after 300 cycles
    [32]
    Reduced graphene oxide509 / 0.1
    196 / 5
    250 / 1
    after 1000 cycles
    [30]
    Graphene oxide paper290.5 / 0.05
    22.4 / 2
    210 / 1
    after 250 cycles
    [33]
    Crumpled graphene paper183 / 0.1
    61 / 8
    120 / 1
    after 500 cycles
    [34]
    N-carbon dots pillared
    graphene blocks
    520 / 0.02
    118 / 10
    125 / 10
    after 10000 cycles
    [13]
    3D interconnected hollow channel reduced graphene oxide329.8 / 0.1
    163.9 / 2
    166.8 / 1
    after 1000 cycles
    [35]
    Holey graphene oxide365 / 0.1
    131 / 10
    163 / 2
    after 3000 cycles
    [36]
    Nitrogen-rich graphene hollow microspheres253.8 / 0.1
    66.7 / 20
    77.8 / 10
    after 8000 cycles
    [37]
    Nitrogen-doped
    graphene foams
    1057.1 / 0.1
    137.7 / 5
    594 / 0.5
    after 500 cycles
    [38]
    Graphene nanowires anchored to 3D graphene foam497 / 0.0375
    203 / 7.5
    291 / 0.375
    after 1000 cycles
    [39]
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-11-23
  • 修回日期:  2023-03-03
  • 网络出版日期:  2022-08-23
  • 刊出日期:  2023-04-07

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