Efficiently dense hierarchical graphene based aerogel electrode for supercapacitors

Wang, Xin; Lu, Chengxing; Peng, Huifen; Zhang, Xin; Zhen-kun, Wang; Wang, Gongkai

doi:10.1016/j.jpowsour.2016.05.085

Cited by 98 publications

(49 citation statements)

References 46 publications

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“…The N‐DGA exhibits more pronounced hysteresis loop, suggesting the increased content of mesopore texture. The steep uptake at the pressure of 0.9‐1.0 is associated with the no saturation adsorption due to the large number of macropores in the texture ,. The calculated specific surface areas are 338, 330 and 510 m 2 g −1 , corresponding to GA, N‐GA and N‐DGA, respectively, proving the created pore structure by H 2 O 2 etching.…”

Section: Resultsmentioning

confidence: 88%

“…That indicates the short‐term order of graphene layers in the aerogels. The peak intensity of N‐GA and N‐DGA is slightly lower than that of GA, suggesting the decreased short‐term order degree due to either N doping or structural defects . Figure b shows the corresponding Raman spectra that give a sensitive response to the crystallinity, defects and disorder of microstructure ,.…”

Section: Resultsmentioning

confidence: 99%

“…The microstructure and electrochemical behavior were evaluated. Meanwhile, a GA/activated carbon composite was also prepared according to our previous report . The all graphene based LICs full cells were assembled using the N‐doped defective GA as negative electrode and GA/activated carbon composite as positive electrode.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen‐Doped Defective Graphene Aerogel as Anode for all Graphene‐Based Lithium Ion Capacitor

Wang

Zhang

et al. 2017

ChemistrySelect

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Nitrogen-doped defective graphene aerogel (N-DGA) was prepared by a hydrothermal method incorporated with mild pore-forming and post doping processes. The microstructure and electrochemical behavior were evaluated. The N-DGA with relatively high-level nitrogen content maintains a three-dimensional (3D) interconnected structure, in which wrinkled graphene presents obvious in-plane pores. The specific capacities of 1387 and 143 mAh g À1 could be achieved at current densities of 50 and 1000 mA g À1 , respectively. The greatly improved electrochemical performance as the anode in contrast to that of the graphene aerogel (GA) without any structural modifications can be ascribed to the 3D micro-structure, heteroatom doping and defect sites. These features endow the entire electrode with highly accessible surface area, improved conductivity, efficient ion transport and electrochemically active surface, which are beneficial to reversible lithium ion storage, rate capability as well as stability. The LICs full cell by using the N-DGA anode and defective graphene aerogel/ activated carbon (DGA/AC) cathode was assembled and the corresponding performance was also evaluated. The maximum energy and power densities of 39 Wh kg À1 and 1.2 kW kg À1 could be delivered. The descent performance shows a promising perspective of all graphene based LICs with high energy/ power densities.[a] Dr.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

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Nitrogen‐Doped Defective Graphene Aerogel as Anode for all Graphene‐Based Lithium Ion Capacitor

Wang

Zhang

et al. 2017

ChemistrySelect

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“…This two‐step synthesis strategy has attracted considerable attention, because the process can construct the desired microstructures and ensure electrochemical function . Moreover, graphene aerogel (GA), in which flexible graphene sheets partially overlap in 3D space to form an interconnected porous microstructure, is developing rapidly , . Electrolytes can easily diffuse inside and through the network, due to the special hierarchical architecture of GA.…”

Section: Introductionmentioning

confidence: 99%

One‐Step Synthesis of Co₃O₄/Graphene Aerogels and Their All‐Solid‐State Asymmetric Supercapacitor

et al. 2017

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A facile one-step hydrothermal strategy has been developed to prepare 3D porous Co 3 O 4 /graphene aerogel (Co 3 O 4 / GA). Due to the combination of a highly interconnected 3D network of GA and porous Co 3 O 4 nanospheres, the resulting Co 3 O 4 /GA electrode exhibits exceptional electrical conductivity and pseudocapacitance, making it an excellent material for energy-storage devices. The Co 3 O 4 /GA composites possess a high specific surface area of 127 m 2 g -1 and a broad pore-size distribution of 1-110 nm. The presence of porous Co 3 O 4 is found to be remarkably effective in enhancing the specific capacitance of the composite aerogel, up to 1512.7 F g -1 at 1 A g -1 . Furthermore, the combination of the two aerogel electrodes with a [a] LiOH/PVA-gel electrolyte endows our all-solid-state asymmetric supercapacitor (SASC) of Co 3 O 4 /GA//GA with a stable cycling performance in the high-voltage region of 0-1.6 V (capacitance retention of 81.5 % after 5000 continuous charge/discharge cycles), and superior electrochemical performance, with an energy density of 68.1 W h kg -1 at a power density of 982.9 W kg -1 , which is even higher than the maximum energy density of 58.7 W h kg -1 at a power density of 1209.4 W kg -1 of this ASC in a liquid-state electrolyte. These results indicate that Co 3 O 4 /GA could be a potential candidate in the field of supercapacitors.ionic conductivity, toxicity, and easy leakage, which limits their large-scale application. To solve this problem, the all-solid-state ASC has been extensively explored, due to its portability, environmental friendliness, and stability.The key to achieving high energy and power densities in allsolid-state ASCs is to choose electrode materials with excellent electrochemical properties. Intensive efforts have been devoted to ASCs with higher energy and power density by exploring various redox-active materials, such as Co 3 O 4 @Ni(OH) 2 //graphene, CNT/MnO 2 /GR//CNT/PANI, graphene/Ni(OH) 2 //AC, Ni@rGO/ Co 3 S 4 //Ni@rGO/Ni 3 S 2 , and so on. [7][8][9][10] Nevertheless, a simple synthesis method for the development of porous three-dimensional (3D) metal oxides is still a challenge. Porous metal oxides usually show different physical properties than bulk materials. [11,12] A porous 3D structure is beneficial for improving electrochemical properties, because the short ion-diffusion path and the high surface area provide more efficient contact between the electrolyte ions and active materials for faradic energy storage. [13] So, it is essential to develop a new energystorage material with abundantly porous, nanostructured, large surface-area characteristics.Among the many metal oxides, Co 3 O 4 is one of the most promising materials for low-cost and environment-friendly ASC devices with high specific capacitance. [14,15] The usual methods for the synthesis of porous Co 3 O 4 , through the calcination process, easily cause the collapse of the material structure, resulting in limited practical applications. Moreover, the intrinsic nature of transition-metal...

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“…Методы получения гидрогелей на основе оксида графита можно разделить на две основные группы. В первой применяют химическое восстановление при помощи аскорбиновой кислоты, иодидов и иодоводородной кислоты, гидразина, сульфидов и сульфитов щелочных металлов, во второй -гидротермальный метод, проводимый в автоклаве при температурах 140-150°С [8][9][10][11][12][13][14][15][16][17]. Для получения аэрогелей предложено использовать метод криохимической сушки.…”

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3d-Структуры На Основе Восстановленного Оксида Графита И Наночастиц Золота И Их Сорбционные Свойства

Eremina¹,

Dobrovol'skii²,

Lemesh³

et al. 2020

Rossijskie nanotehnologii

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Описано получение гидро- и аэрогелей на основе восстановленного оксида графита и наночастиц золота, полученных методом Туркевича. Наночастицы золота, согласно данным просвечивающей электронной микроскопии, имеют сферическую форму и средний размер 16–18 нм. Для характеризации полученных 3D-структур использована сорбция растворов красителя метиленового голубого. Проведено сравнение сорбционных свойств гидро- и аэрогелей, показано, что аэрогель сорбирует более эффективно (>80%), чем композит на основе гидрогеля (~50%). Сформированная пористая 3D-структура аэрогеля эффективно сорбирует молекулы красителя, а наночастицы золота, входящие в состав аэрогеля, способствуют его разрушению под воздействием видимого света. Сорбция красителя аэрогелем чистого оксида графита проходит с наибольшей эффективностью при комнатной температуре, в нейтральной среде и без использования дополнительных восстановителей. Введение в аэрогели наночастиц золота позволяет увеличить эффективность сорбции на 15%.

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Efficiently dense hierarchical graphene based aerogel electrode for supercapacitors

Cited by 98 publications

References 46 publications

Nitrogen‐Doped Defective Graphene Aerogel as Anode for all Graphene‐Based Lithium Ion Capacitor

Nitrogen‐Doped Defective Graphene Aerogel as Anode for all Graphene‐Based Lithium Ion Capacitor

One‐Step Synthesis of Co₃O₄/Graphene Aerogels and Their All‐Solid‐State Asymmetric Supercapacitor

3d-Структуры На Основе Восстановленного Оксида Графита И Наночастиц Золота И Их Сорбционные Свойства

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Efficiently dense hierarchical graphene based aerogel electrode for supercapacitors

Cited by 98 publications

References 46 publications

Nitrogen‐Doped Defective Graphene Aerogel as Anode for all Graphene‐Based Lithium Ion Capacitor

Nitrogen‐Doped Defective Graphene Aerogel as Anode for all Graphene‐Based Lithium Ion Capacitor

One‐Step Synthesis of Co3O4/Graphene Aerogels and Their All‐Solid‐State Asymmetric Supercapacitor

3d-Структуры На Основе Восстановленного Оксида Графита И Наночастиц Золота И Их Сорбционные Свойства

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One‐Step Synthesis of Co₃O₄/Graphene Aerogels and Their All‐Solid‐State Asymmetric Supercapacitor