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Layered double hydroxides (LDHs) often require the use of carbon materials to improve their stability, conductivity, and specific surface area to accommodate new directions in the development of high-performance energy storage materials. Herein, 2D nickel cobalt layered double hydroxide (NCLDH) nanosheets are regulated to form 3D flower-like spheres by fungus bran-derived carbon dots (CDs) via an in situ growth method. The prepared sample (CDs/NCLDH) shows abundant accessible active sites and favorable electrical conductivity, which is aided by strong interactions between CDs and NCLDH. The optimized CDs/NCLDH exhibits significantly enhanced electrochemical performances, including ultrahigh specific capacitance (2100F g

Integrating and utilizing natural resources rationally is an important strategy for sustainable development. Herein, a novel nanoporous carbon material with rime scenery-like support was firstly established, in which waste biomass fungus bran was skillfully selected as the layered structure carbon skeletons for loading carboxymethyl cellulose derived carbon particles. The dual biomass-derived carbon with the aid of activating by KMnO4 has a unique structure and favorable electrical conductivity. The resulting sample also has a high micropore ratio, which is optimum for the formation of double layer in aqueous electrolyte. Profiting from hierarchical nanopore structure and nitrogen self-doping, the optimized carbon electrode exhibited excellent specific capacitance of 407 F g−1 at 0.5 A g−1, remarkable rate characteristic, and superior cycling performance (96.9% remained after 5000 cycles). More importantly, the assembled symmetric supercapacitor exhibited a high energy density of 11.4 Wh kg−1 and outstanding electrochemical performance in aqueous electrolyte, which benefited from well-connected networks and multipath channels. This research realizes the utilization of waste biomass in carbon-based electrodes and offers the basis of preparation method for the next generation of sustainable energy storage devices. The fabricated rime scenery-like nanoporous carbon materials exhibit ultra-high specific capacitance and the symmetric supercapacitor possesses a high energy density and power density.

Metal-organic frameworks (MOFs) are promising for photocatalysis owing to their excellent structure and performance. Unfortunately, poor stability in both aqueous solutions and high temperatures and lack of adsorption centers during reactions limit their practical applications. Herein, a bimetallic MOF anchored corncob calcined derived activated carbon (CCAC) was successfully prepared by a one-step solvothermal method. Benefiting from unique structures and synergetic effect, the porous carbon provided a high specific surface area for stable MOF support and served as an organic pollutant buffer-reservoir, which was advantageous for efficient photocatalytic degradation of organic pollutants. The optimized MOF/CCAC-5 samples possessed excellent visible light degradation rate, i.e., 100% for Rh B, more than 96% for six mixed dyes, and 98% for tetracycline. This prominent photocatalytic activity was caused by active species, including photoelectrons (e-), photo-holes (h+) and superoxide free radicals (•O2-). The transient photocurrent response and electrochemical impedance tests showed that MOF/CCAC-5 exhibited a relatively high charge separation and low carrier recombination rate. Cyclic and simulation experiments indicated high reusability, stability and universality of the composite photocatalysts. These exciting results provide new pathways for the fabrication of MOFs anchored porous carbon materials.