摘要：期刊发表名为“Nanodiamond Covalently Anchored Reduced Graphene Oxide 3D Ultraelastic Aerogels toward 2.0 V Aqueous Supercapacitors”的论文，提氧
1成果简介
传统的水基对称碳基超级电容器面临固有电压限制（通常≤ 1.0 V），从根本上限制了其能量密度潜力。本文，南京理工大学《Ind. Eng. Chem. Res
》期刊发表名为“Nanodiamond Covalently Anchored Reduced Graphene Oxide 3D Ultraelastic Aerogels toward 2.0 V Aqueous Supercapacitors”的论文，提氧官能化引爆纳米金刚石（OND）和氧化石墨烯（GO）通过sp3-sp2 碳杂化自组装成三维（3D）rGO-OND超能气凝胶。
这种分层三维结构为电子和声子建立了双导电通道，同时保持了优异的机械韧性。经过优化的 rGO-10%OND 复合材料在对称超级电容器配置中表现出了突破性的电化学性能。优化后的 rGO-10%OND 作为水基对称超级电容器装置中的电极材料，可以在 0-2.0 V 的空前电压窗口内稳定地进行充电和放电，超出传统限制 100%。同时，经过 10000 次循环后，库仑效率和电容保持率均接近 100%。在功率密度为 1000 W kg-1 时，能量密度达到 23.1 Wh kg-1。原位扫描电化学显微镜（SECM）和原位拉曼光谱证明，优异的电化学性能主要归功于rGO-10%OND特殊的氧化还原反应性、加速的离子扩散动力学和显著的结构完整性。
2图文导读
图1. Schematic illustration of the fabrication process of esterification self-assembled rGO-OND aerogels and their application as electrodes for a symmetric supercapacitor device.
图2. SEM images of (a) rGO and (b) rGO-10%OND; HR-TEM images of (c) OND and (d) rGO-10%OND; (e) STEM-HAADF image; and (f) EDX mapping of C of rGO-10%ONDs.
图3. (a) XRD patterns, (b) 2D XRD image, (c) Raman spectra, and (d) FT-IR spectra of OND, rGO, rGO-5%OND, rGO-10%OND, and rGO-30%OND.
图4. (a) The survey XPS spectra and (b) high-resolution XPS O 1s spectra of OND, rGO, rGO-5%OND, rGO-10%OND, and rGO-30%OND.
图5. (a) CV curves of substrates loaded with rGO and rGO-10%OND, (b) CV curves of the tip, and (c) SECM tip approach curves (PACs) of rGO and rGO-10%ONDs [ET = −0.3 V, ES(OCV)]. Three-dimensional SECM images of (d) rGO and (e) NDs-rGO at a constant height within a geometric area of 3 × 3 mm2.
图6. Electrochemical performance of rGO, rGO-5%OND, rGO-10%OND, and rGO-30%OND-based symmetric supercapacitors. (a) CV curves at a scan rate of 5 mV s–1, (b) GCD curves at a current density of 1 A g–1, (c) specific capacitances at different current densities, (d) Coulombic efficiencies and specific capacitances at 1 A g–1, (e) Nyquist plots, (f) Bode plots, (g) Ragone plots, and (h) cycle performance at 2 A g–1 of the rGO-10%OND-based symmetric supercapacitor.
图7. (a) Schematic diagram of a homemade device for the in situ Raman testing of aqueous symmetrical supercapacitors. (b) Voltage-dependent in situ Raman spectra of the rGO-10%OND//rGO-10%OND symmetrical supercapacitor device.
3小结
我们采用水热自组装策略成功合成了三维多孔rGO-OND气凝胶。结果表明，OND 通过酯化反应与rGO表面结合，将纳米级的ON 牢固固定在rGO的大表面上。均匀分布在rGO层之间的 OND 有效抑制了rGO层的堆积，而 rGO 则反过来防止了OND的聚集。OND 和 rGO 的结合增强了高弹性气凝胶的活性表面，并赋予其优异的导电性和导热性。优化后的 rGO-10%OND 气凝胶具有显著的弹性特性。在释放 99% 的体积压缩后，仅需 0.5 秒就能完全恢复其原始形状。作为超级电容器的电极材料，rGO-10%OND 在三电极系统中的比电容达到了277.1Fg-1，在电流密度为 1-10 A g-1 时的速率性能为 80%。SECM 结果表明，rGO-10%OND作为超级电容器的电极材料可显著提高反应活性和离子扩散动力学。用rGO-10%OND作为电极材料组装的全碳对称超级电容器可在2.0V 电压下稳定运行，在功率密度为1000W kg-1 时，能量密度高达23.1 Wh kg-1。
文献：https://doi.org/10.1021/acs.iecr.5c01153
来源：杭州有一路看一路
