Dual‐Functional Templated Methodology for the Synthesis of Hierarchical Porous Carbon for Supercapacitor

Abstract

Dual‐functional templated methodology was developed for synthesis of hierarchical porous carbons via direct thermal decomposition of agricultural wastes, in which dairy manure acted as low cost carbon precursor and eggshell as both hard template and activating agent source of CO2. The dual‐functional template can be easily removed by diluted HCl instead of corrosive HF. Carbonization temperature and dosage of eggshell have great influence on the porous texture of the carbon materials. Optimized temperature of 800 oC and mass ratio of eggshell/dairy manure (2:1) facilitate the releasing of CO2 from eggshell thus benefitting the formation of hierarchical porous carbon. The porous carbon has maximum surface area of 543.6 m2/g and total pore volume of 0.48 cm3/g of which micropores account for 40%. As the electrode of supercapacitor, the obtained hierarchical porous carbons showed a relative high specific capacitance of 226.6 F/g in KOH aqueous electrolyte (6 mol/L). Besides, it exhibited outstanding cycling stability with almost 100% of specific capacitance retention after 2500 GCD cycles. The one‐step template carbonization method provides a facile and sustainable route to prepare hierarchical porous carbons from the agricultural wastes.

Crab Shell-Derived Lotus Rootlike Porous Carbon for High Efficiency Isomerization of Glucose to Fructose under Mild Conditions

“…The XRD pattern and Raman spectrum of the resulting carbon/CaO composites are shown in Figure S1. For the carbon/CaO composite obtained at 600 °C, no characteristic crystalline phase of CaO is observed, since CaCO 3 was not decomposed below 650 °C . The carbon/CaO prepared at 800 °C (CS-CaO-800) shows crystalline phase dominated by calcium oxide, indicating the presence of CaO in the composite synthesized from crab shell.…”

“…For the carbon/CaO composite obtained at 600 °C, no characteristic crystalline phase of CaO is observed, since CaCO 3 was not decomposed below 650 °C. 28 The carbon/CaO prepared at 800 °C (CS-CaO-800) shows crystalline phase dominated by calcium oxide, indicating the presence of CaO in the composite synthesized from crab shell. Higher temperature (1000 °C) caused no change of crystalline phase of the resulting composite (CS-CaO-1000).…”

Comparison of porous carbons derived from sodium alginate and calcium alginate and their electrochemical properties

“…All these curves show linear monolayermultilayer adsorption properties and hysteresis loops, and hysteresis loops are generally considered to be related to the capillary condensation process occurred in mesopores, indicating the presence of mesopores. [38][39][40][41] Furthermore, it can be noticed that carbonized samples adsorb little nitrogen while porous carbons adsorb a large amount of nitrogen at low pressure, indicating that most of micropores should be created during the KOH activation process.…”

The Performance Evaluation of Vegetable Supply Chain under the Docking Mode of Agricultural Supermarket

“…(1) Introduction to the model of performance evaluation of vegetable supply chain in the agricultural super-docking mode 1) Supply Chain Operation Reference Model (SCOR) Supply chain management involves multiple enterprise nodes, that is, multiple management objects. There is a complex survival relationship between these nodes and enterprises that are interdependent and interdependent [20]. The SCOR model is applicable to supply chains in many different fields.…”