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首页> 外文期刊>RSC Advances >One-pot synthesis of CoFe2O4/rGO hybrid hydrogels with 3D networks for high capacity electrochemical energy storage devices
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One-pot synthesis of CoFe2O4/rGO hybrid hydrogels with 3D networks for high capacity electrochemical energy storage devices

机译：具有3D网络的一锅法合成CoFe2O4 / rGO杂化水凝胶，用于大容量电化学储能装置

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CoFe _(2) O _(4) /reduced graphene oxide (CoFe _(2) O _(4) /rGO) hydrogel was synthesized in situ via a facile one-pot solvothermal approach. The three-dimensional (3D) network structure consists of well-dispersed CoFe _(2) O _(4) nanoparticles on the surfaces of graphene sheets. As a binder-free electrode material for supercapacitors, the electrochemical properties of the CoFe _(2) O _(4) /rGO hybrid hydrogel can be easily adjusted by changing the concentration of the graphene oxide (GO) precursor solution. The results indicate that the hybrid material made using 3.5?mg mL ~(?1) GO solution exhibits an outstanding specific capacitance of 356 F g ~(?1) at 0.5 A g ~(?1) , 68% higher than the pure CoFe _(2) O _(4) counterpart (111 F g ~(?1) at 0.5 A g ~(?1) ), owing to the large specific surface area and good electric conductivity. Additionally, an electrochemical energy storage device based on CoFe _(2) O _(4) /rGO and rGO was assembled, which exhibits a high energy density of 17.84 W h kg ~(?1) at a power density of 650 W kg ~(?1) and an excellent cycling stability with 87% capacitance retention at 5 A g ~(?1) after 4000 cycles. This work takes one step further towards the development of 3D hybrid hydrogel supercapacitors and highlights their potential application in energy storage devices.
机译：CoFe_（2）O_（4）/还原氧化石墨烯（CoFe_（2）O_（4）/ rGO）水凝胶是通过一种简便的一锅溶剂热方法原位合成的。三维（3D）网络结构由分散在石墨烯片表面的CoFe _（2）O _（4）纳米粒子组成。作为用于超级电容器的无粘合剂电极材料，可以通过更改氧化石墨烯（GO）前体溶液的浓度轻松调节CoFe _（2）O _（4）/ rGO混合水凝胶的电化学性能。结果表明，使用3.5？mg mL〜（？1）GO溶液制备的杂化材料在0.5 A g〜（？1）时具有356 F g〜（？1）的优异比电容，比纯净材料高68％。 CoFe _（2）O _（4）的对应物（0.5 A g〜（？1）时为111 F g〜（？1）），原因是比表面积大且导电性好。另外，组装了基于CoFe _（2）O _（4）/ rGO和rGO的电化学储能装置，其在650 W kg的功率密度下显示出17.84 W h kg〜（？1）的高能量密度。 〜（？1）和极好的循环稳定性，在4000次循环后，在5 A g〜（？1）时的电容保持率为87％。这项工作进一步朝着3D混合水凝胶超级电容器的发展迈出了一步，并突出了其在储能设备中的潜在应用。

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