Ultra-high specific surface area porous carbons derived from Chinese medicinal herbal residues with potential applications in supercapacitors and CO2 capture

Ammonium persulfate assisted synthesis of ant-nest-like hierarchical porous carbons derived from chitosan for high-performance supercapacitors and zinc-ion hybrid capacitors

“…The values of k 1 and k 2 may be determined at different potentials, where i, k 1 n and k 2 /v 1/2 reect the total current response, capacitive-controlled process, and diffusion-controlled effects. Furthermore, the ratio of capacitance contribution and diffusion contribution is analyzed by using eqn (6). Moreover, Fig.…”

“…7b, which show scan rates ranging from 5 to 200 mV s −1 , indicates a strong rate capability of the supercapacitor as built. 6,9 Using the Dunn method, we similarly examined the contributions of EDLC and pseudo-capacitance to evaluate the inuence of the hierarchical porous structure and heteroatom doping in the AH-PC-based electrode immersed in a 1 M Na 2 SO 4 electrolyte. As shown in Fig.…”

“…7h). [6][7][8][9]35,[63][64][65][66][67] To illustrate the usefulness of its high density in real-world applications, two AH-PCs/Na 2 SO 4 /AH-PC supercapacitors are linked in series and are easily powered (Fig. 7i).…”

“…[1][2][3][4][5] How to effectively and cheaply transform these agricultural wastes into valuable chemical products and materials has drawn increasing attention all over the world. [6][7][8][9] Biomass wastes possess the advantages of wide availability, sustainability, renewability, distinctive structures, and cost-effectiveness, and can be employed as excellent precursors for producing porous carbons. [10][11][12][13][14][15] The variety of structures found in porous carbons obtained from biomass wastes allows for a variety of applications, including in water treatment, hydrogen storage, electrochemical energy storage, dye-sensitized solar cells, and carbon dioxide extraction.…”

“…The inadequate specic surface areas and porosity, and decient heteroatom retention, lead to suboptimal electrochemical performance in supercapacitors during high-rate and long-cycle operations. [6][7][8][9][10][11][12][13][14][15][35][36][37] The practical achievement of hundreds of thousands of cycles is still challenging, and it has been reported that the service life of carbon-based devices rarely exceeds 200 000 cycles, especially at high current rates. 38 How to increase the active sites of chitosan to increase the crosslinking degree, to effectively prepare chitosan-derived porous carbons with enhanced electrochemical performance, is still a great and critical challenge.…”