Synthesis of Au sponges based on agarose template

Kwak, Soyul; Jang, Seohyeon; Park, Sumin; Kang, Jihyeon; Kim, Tae Yong; Nam, Inho

doi:10.1016/j.scriptamat.2021.113769

Cited by 5 publications

(7 citation statements)

References 24 publications

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“…Therefore, the fabricated sample is almost composed of rGO, series of steps constitutes an easy and low-cost manufacturing process standing 3D-structured graphene electrode. The observed porous structure of the 3DWG is replicated f porous nature of the agarose gel [16]. The 3D interconnected rGO stru have a few micrometer-sized macropores where the (now-removed) w earlier existed.…”

Section: Resultsmentioning

confidence: 77%

“…Based on the previous research, half of GO can remain as rGO at th perature (500 °C) [6]. On the other hand, agarose is almost eliminate [16,23,24]. Therefore, the fabricated sample is almost composed of rGO, series of steps constitutes an easy and low-cost manufacturing process standing 3D-structured graphene electrode.…”

Section: Resultsmentioning

confidence: 94%

“…Based on the previous research, half of GO can remain as rGO at the calcination temperature (500 °C) [ 6 ]. On the other hand, agarose is almost eliminated at over 450 °C [ 16 , 23 , 24 ]. Therefore, the fabricated sample is almost composed of rGO, not agarose.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2 a,b show the SEM images of the 3DWG at low and high magnifications, respectively. The observed porous structure of the 3DWG is replicated from the intrinsic porous nature of the agarose gel [ 16 ]. The 3D interconnected rGO structure appears to have a few micrometer-sized macropores where the (now-removed) water and agarose earlier existed.…”

Section: Resultsmentioning

confidence: 99%

“…Simple heat-up (to ~90–95 °C) and subsequent cooling (to room temperature) in water form a three-dimensional (3D) interconnected porous structure of gelated agarose. Owing to its water solubility, tunable porosity, scalable production, and environmental friendliness, the soft agarose gel template has been successfully utilized to construct 3D porous structures of metals and metal oxides in our previous research [ 16 , 17 , 18 , 19 ]. Here, we demonstrate a facile method to fabricate a 3D wrinkled structure of rGO (3DWG) using the soft agarose gel template.…”

Section: Introductionmentioning

confidence: 99%

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Agarose Gel-Templating Synthesis of a 3D Wrinkled Graphene Architecture for Enhanced Supercapacitor Performance

et al. 2022

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The increasing use of rapidly fluctuating renewable energy sources, such as sunlight, has necessitated the use of supercapacitors, which are a type of energy storage system with high power. Chemically exfoliated graphene oxide (GO) is a representative starting material in the fabrication of supercapacitor electrodes based on reduced GO (rGO). However, the restacking of rGO sheets driven by π–π stacking interactions leads to a significant decrease in the electrochemically active surface area, leading to a loss of energy density. Here, to effectively inhibit restacking and construct a three-dimensional wrinkled structure of rGO (3DWG), we propose an agarose gel-templating method that uses agarose gel as a soft and removable template. The 3DWG, prepared via the sequential steps of gelation, freeze-drying, and calcination, exhibits a macroporous 3D structure and 5.5-fold higher specific capacitance than that of rGO restacked without the agarose template. Further, we demonstrate a “gel-stamping” method to fabricate thin-line patterned 3DWG, which involves the gelation of the GO–agarose gel within micrometer-sized channels of a customized polydimethylsiloxane (PDMS) mold. As an easy and low-cost manufacturing process, the proposed agarose gel templating method could provide a promising strategy for the 3D structuring of rGO.

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Section: Resultsmentioning

confidence: 77%