Hierarchical Porous Activated Carbon from Wheat Bran Agro‐Waste: Applications in Carbon Dioxide Capture, Dye Removal, Oxygen and Hydrogen Evolution Reactions

Abstract

This work reports an efficient method for facile synthesis of hierarchically porous carbon (WB‐AC) utilizing wheat bran waste. Obtained carbon showed 2.47 mmol g−1 CO2 capture capacity with good CO2/N2 selectivity and 27.35 to 29.90 kJ mol−1 isosteric heat of adsorption. Rapid removal of MO dye was observed with a capacity of ~555 mg g−1. Moreover, WB‐AC demonstrated a good OER activity with 0.35 V low overpotential at 5 mA cm−2 and a Tafel slope of 115 mV dec−1. It also exhibited high electrocatalytic HER activity with 57 mV overpotential at 10 mA cm−2 and a Tafel slope of 82.6 mV dec−1. The large SSA (757 m2 g−1) and total pore volume (0.3696 cm3 g−1) result from N2 activation contributing to selective CO2 uptake, high and rapid dye removal capacity and superior electrochemical activity (OER/HER), suggesting the use of WB‐AC as cost effective adsorbent and metal free electrocatalyst.

Engineered Nanoporous Frameworks for Adsorption Cooling Applications

“…2,13,40,56,59−61 In 1969, adsorption cooling-related advancements were initially focused on the design of ideal sorption cooling engines, heat source adsorption cooling/heating system configurations, and potential applications. Afterward, attention turned to the development of refrigerant/standard sorbent working pairs, including silica gel/water or methanol, 62,63 zeolite/water, 64 monolithic carbon/ammonia, 65 activated carbons/CO, 66,67 or n-butane or R134a or HFOs 68−70 activated carbon fibers/fluorocarbons (R123, R134a) or ethanol. 71−73 In 2012, engineered nanoporous materials such as MOFs were proposed for such applications, 74,75 and their adsorption cooling performance was systematically explored through the use of MOFs as sorbents.…”

“…Figure shows advancements in the refrigerant–sorbent pairs used in adsorption cooling applications over recent decades. ,,,,− In 1969, adsorption cooling-related advancements were initially focused on the design of ideal sorption cooling engines, heat source adsorption cooling/heating system configurations, and potential applications. Afterward, attention turned to the development of refrigerant/standard sorbent working pairs, including silica gel/water or methanol, , zeolite/water, monolithic carbon/ammonia, activated carbons/CO, , or n -butane or R134a or HFOs − activated carbon fibers/fluorocarbons (R123, R134a) or ethanol. − In 2012, engineered nanoporous materials such as MOFs were proposed for such applications, , and their adsorption cooling performance was systematically explored through the use of MOFs as sorbents. − Meanwhile, strategies like pore engineering and defect engineering in ENFs have shown improved performance in fluorocarbon adsorption and separation, highlighting their great potential for adsorption refrigeration techniques. ,,,,,,− …”

Synergetic Effect of Microporosity, Composition, and Surface Functionality of Nanoporous Activated Carbon: An Interface for CO2 Capture and Supercapacitor Applications

“…Furthermore, the energy crisis resulting from natural resource depletion and decreasing fuel availability has become a serious concern that requires immediate corrective action . As a result, CO 2 uptake and energy storing devices like supercapacitors have been extensively researched as potential solutions to the aforementioned problems. − …”