Bilal Muhammad, Li Jiajie, Kumar Neelesh, Mosevitzky Bar, Wachs Israel E, Landskron Kai
Department of Chemistry, Lehigh University, 6 East Packer Avenue, Bethlehem, PA 18015, USA.
Department of Chemical and Bioengineering, Lehigh University, 5 East Packer Avenue, Bethlehem, PA 18015, USA.
Angew Chem Int Ed Engl. 2024 Sep 23;63(39):e202404881. doi: 10.1002/anie.202404881. Epub 2024 Aug 23.
We report on the supercapacitive swing adsorption (SSA) of carbon dioxide at different voltage windows in the presence of oxygen using activated carbon electrodes, and deliquescent, aqueous electrolytes. The presence of O in the CO/N gas mixture results in an up to 11 times higher CO adsorption capacity with 3 M MgBr (at 0.6 V) and up to 4-5 times higher adsorption capacity with 3 M MgCl (at 1 V). A tradeoff between high CO adsorption capacities and lower coulombic efficiencies was observed at voltages above 0.6 V. The energetic and adsorptive performance of the electrodes in the presence of oxygen below 0.5 V was similar to the performance with a CO/N mixture without oxygen at 1 V. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) of the electrodes demonstrate that the specific capacitance increases while the diffusion resistance decreases in the presence of oxygen. Oxygen concentrations ranging between 5-20 % give similar energetic and adsorptive performance. The electrodes exhibit stable performance for up to 100 cycles of operation.
我们报道了在存在氧气的情况下，使用活性炭电极和潮解性水性电解质，在不同电压窗口下二氧化碳的超级电容摆动吸附（SSA）。在CO₂/N₂气体混合物中存在O₂时，使用3M MgBr₂（在0.6V时），CO₂吸附容量提高高达11倍，使用3M MgCl₂（在1V时），吸附容量提高高达4 - 5倍。在高于0.6V的电压下，观察到高CO₂吸附容量和较低库仑效率之间的权衡。在低于0.5V的氧气存在下，电极的能量和吸附性能与在1V下无氧的CO₂/N₂混合物中的性能相似。电极的循环伏安法（CV）和电化学阻抗谱（EIS）表明，在有氧气存在时，比电容增加而扩散电阻降低。氧气浓度在5 - 20%之间时，能量和吸附性能相似。电极在高达100次循环操作中表现出稳定的性能。
