Interconnected and hierarchical porous carbon derived from soybean root for ultrahigh rate supercapacitors

A dual‐activation strategy to tailor the hierarchical porous structure of biomass‐derived carbon for ultrahigh rate supercapacitor

“…The porous structure of KMPC, KPC, and MPC was further investigated by N 2 adsorption/desorption isotherms. As shown in Figure 3A, the isotherm of KPC belonged to type I exhibits a nearly vertical line (P/P 0 < 0.01) and an obvious plateau (0.01 < P/P 0 < 0.99), indicating its microporous characteristics 31‐33 . MPC and KMPC present hybrid isotherm (type I/IV) with a cocked adsorption “tail” at high P/P 0 , a hysteresis loop at middle P/P 0 , and a sharp uptake at low P/P 0 , confirming the coexistence of macropores, mesopores, and micropores 34 .…”

“…As shown in Figure 3A, the isotherm of KPC belonged to type I exhibits a nearly vertical line (P/P 0 < 0.01) and an obvious plateau (0.01 < P/P 0 < 0.99), indicating its microporous characteristics. [31][32][33] MPC and KMPC present hybrid isotherm (type I/IV) with a cocked adsorption "tail" at high P/P 0 , a hysteresis loop at middle P/P 0 , and a sharp uptake at low P/P 0 , confirming the coexistence of macropores, mesopores, and micropores. 34 Compared to MPC, the higher adsorption at low P/P 0 and lower adsorption at high P/P 0 indicate the higher SSA and lower macropore volume of KMPC.…”

“…The oxidation treatment also endows the oxidative product with high reactivity during the activation process. 35,36 The generating Mn-oxide compounds can also serve as template to produce a large number of mesopores (Figure S1 in Data S1). Different from the decrease of SSA resulting from the strong oxidation and template effect of pure KMnO 4 , the mild dual-activation leads to rational mesopore volume, and higher SSA.…”

Porous carbon materials for microwave absorption

“…PC materials have been widely studied and applied in many fields such as catalysis, batteries, and supercapacitors due to their high specific areas, tunable pore sizes and pore structures. [47][48][49][50][51][52][53][54][55][56] Meanwhile, these advantages also make PC materials expected to become MA materials: firstly, a porous material could be regarded as a composite composed of the solid component and air component, which efficiently decreases the density and increases the impedance matching. 57 Secondly, the porous structure could generate more interface polarization loss, which would increase absorption of EM wave energy.…”

Geometrical effects on ionic diffusion in carbon‐carbon symmetric supercapacitors

“…Nano-porous carbonaceous materials possess high surface area with a large amount of adsorption sites for electrolyte ions and have the potential to achieve high specific capacitance. [21][22][23] Note that the geometrical dimensions and morphology of pores also play important roles in charge storage. 1,24 Pores inaccessible to electrolyte ions cannot contribute the energy storage through electric double layer; micropores with sizes slightly larger than electrolyte ions can provide plenty of adsorption sites and are the major structure contributing to high specific capacitance; and mesopores with relatively large sizes benefit ion diffusion for fast charging/discharging.…”