Prolifera‐Green‐Tide as Sustainable Source for Carbonaceous Aerogels with Hierarchical Pore to Achieve Multiple Energy Storage

Abstract

8487wileyonlinelibrary.com high-performance energy storage due to its limited control over specific surface area and insufficient porous channels. [5] And also, the current carbon-based energy storage materials suffer from poor kinetic problems associated with the inner-pore ion transports. [4] Tuning/ optimizing the pore shape, the pore sizes distribution, and the pore connectivity in carbon nanomaterials are very important for improving the electrochemical performance. [6] The hierarchically porous carbon (HPC) materials with optimized micro-, meso-, and macropores are considered to be ideal electrode materials for efficient energy storage. [7,8] Particularly, the mesopores in HPC materials can provide the low-resistant pathways for the ions through the porous particles. The ion-buffering reservoirs can be formed in the macropores that can minimize the ions diffusion distances between the interior surfaces. [9,10] Currently, the regular method to fabricate HPC is the use of hard templates. [11] However, the traditional strategies for fabricating hierarchical architectures hamper their commercial utilization due to the complicated preparation procedure and the involvement of expensive nonrenewable templates. It is still a great challenge for developing a template-free, ecofriendly, and scalable approach to fabricate HPC materials from readily available carbon sources, especially from renewable biomass.The increasing demand for efficient energy storage and conversion devices has aroused great interest in designing advanced materials with high specific surface areas, multiple holes, and good conductivity. Here, we report a new method for fabricating a hierarchical porous carbonaceous aerogel (HPCA) from renewable seaweed aerogel. The HPCA possesses high specific surface area of 2200 m 2 g −1 and multilevel micro/meso/macropore structures. These important features make HPCA exhibit a reversible lithium storage capacity of 827.1 mAh g −1 at the current density of 0.1 A g −1 , which is the highest capacity for all the previously reported nonheteroatom-doped carbon nanomaterials. It also shows high specific capacitance and excellent rate performance for electric double layer capacitors (260.6 F g −1 at 1 A g −1 and 190.0 F g −1 at 50 A g −1 ), and long cycle life with 91.7% capacitance retention after 10 000 cycles at 10 A g −1 . The HPCA also can be used as support to assemble Co 3 O 4 nanowires (Co 3 O 4 @HPCA) for constructing a high performance pseudocapacitor with the maximum specific capacitance of 1167.6 F g −1 at the current density of 1 A g −1 . The present work highlights the first example in using prolifera-green-tide as a sustainable source for developing advanced carbon porous aerogels to achieve multiple energy storage.Adv. Funct. Mater. 2016, 26, 8487-8495 www.afm-journal.de www.MaterialsViews.com Scheme 1. Scheme diagram for the fabrication of the hierarchically porous carbon. EP fibers were decolorized and freeze-dried to get the aerogel of EP. Precarbonized at 700 °C and then activated at 700, 800, a...

Experimental and theoretical studies of nonlinear dependence of the internal resistance and electrode thickness for high performance supercapacitor

“…According to reports, it can depend on many factors: (i) size of pores of the activated carbon material, (ii) composition of the material used for production of the energy-storage electrode component, (iii) electrolyte composition, and (iv) thickness of the energy-storage electrode component. To reduce the SC R in value, several cost-effective and simple methods were explored for solving this challenge from the industry technological views5678. Though decades of sustained efforts, it is still a very hot study field and still need substantial progress on developing new technologies for reducing the R in .…”

Biomimetic taro leaf-like films decorated on wood surfaces using soft lithography for superparamagnetic and superhydrophobic performance

“…In the high-resolution spectrum of C1 s (Fig. 4c), as for nano-Fe 3 O 4 biomimetic wood, a peak at 282.6 eV corresponded to the C-Si bonds from PDMS [31], while one which appeared at 284.8 eV corresponded to the C-C bond from the wood [32]. Compared to untreated wood, the peak of nano-Fe 3 O 4 biomimetic wood at 286.5 disappeared due to the effect of covering of the PDMS.…”

“…As for biomimetic wood, the O1s spectra were extra divided into the peaks at 528.3 corresponded to the metal- oxygen bond [30]. The peak at 531.2 eV also suggested PDMS obtained on the wood surface via the OH bond [31]. In the high-resolution spectrum of C1 s (Fig.…”

Co3O4 Supraparticle‐Based Bubble Nanofiber and Bubble Nanosheet with Remarkable Electrochemical Performance

“…The GCD curves (Figure 5c) of the three samples show that the discharging time of RGO/HSP-Co 3 O 4 is much longer and has smaller internal resistance (IR) drop than other samples, indicating higher specific capacitance and faster reaction kinetics. [13,[38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57] The high rate performance can be attributed to the bubble nanosheet structure and fast electrolyte diffusion inside the whole electrode. It is worth noting that 57.8% of capacitance was maintained even at a high scan rate of 200 mV s −1 , indicating that the bubble-nanosheet-structured electrode shows excellent rate performance.…”