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This work focuses on developing the adsorbent for carbon dioxide 1 (CO 2 ) capture from high-humidity flue gas by loading moisture-responsive 2 polyethylenimine (PEI) hydrogel interface layer in porous polymer matrix. The 3 chemical structure and porous morphology of the porous adsorbents are characterized. 4 The CO 2 adsorption capacity and adsorption thermodynamics are studied. And the 5 factors that affect the adsorption capacity including different molecular weight of PEI, 6 loading weight and crosslinking degree of hydrogel, and moisture are investigated. 7 The experimental results show that the porous polymer coated with PEI hydrogel 8 exhibits a much higher adsorption capacity for CO 2 and keep a high CO 2 -N 2 9 selectivity by effective utilization of moisture. The CO 2 adsorption capacity as high as 10 4.85mmol CO 2 /g of adsorbent is obtained at 40°C, with 1,4-butanediol diacrylate 11 (BDA)/PEI ratio of 0.25. Moreover, the formation of three-dimensional crosslinked 12 network in hydrogel shows good regeneration stability. 13

Developing a highly active and cost-effective cathode electrocatalyst with strong stability for oxygen reduction reaction (ORR) is extremely necessary. In this work, we reported a facile synthetic path to prepare a hybrid nanostructure formed of nitrogen-doped Ketjenblack carbon (N-KC) supported Co3O4 nanoparticles (Co3O4/N-KC), which could be used as a promising and stable electrocatalyst for ORR. Compared with the physical mixture of Co3O4 and N-KC and pure N-KC samples, the resulting Co3O4/N-KC nanohybrid afforded remarkably superb ORR activity with a half-wave potential of 0.82 V (vs. reversible hydrogen electrode, RHE) and a limiting current density of 5.70 mA cm−2 in KOH solution (0.1 M). Surprisingly, the Co3O4/N-KC sample possessed a similar electrocatalytic activity but better durability to the 20 wt% Pt/C catalyst. The remarkable ORR activity of the Co3O4/N-KC nanohybrid was mainly due to the strong coupling effect between Co3O4 and N-KC, the N species dopant, high electroconductivity, and the large BET surface area. Our work enlightens the exploitation of advanced Co3O4/carbon hybrid material alternative to the Pt-based electrocatalysts.

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