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We report a facile atmospheric plasma reaction synthesis of Pt x Fe 1- x alloys with the different Pt/Fe stoichiometric ratio in Pt x Fe 1- x alloys on graphene (G) as efficient counter electrode (CE) materials and atmospheric plasma reaction synthesised TiO 2 nanoparticles/G as photoanode in dye-sensitized solar cells (DSSCs). Well-distributed Pt x Fe 1- x nanoparticles or TiO 2 nanoparticles on the G surface were obtained. Remarkably, DSSCs prepared by the Pt 0.7 Fe 0.3 /G CE have much higher catalytic activity and stable durability than Pt 1 Fe 0 /G CE. The as-synthesized Pt 0.7 Fe 0.3 /G CE exhibits the largest value of | J red | = 1.479 mA and the lowest value of R ct = 2.86 Ω. With the Pt 0.7 Fe 0.3 /G as CE and TiO 2 /G as the photoanode, the DSSC can deliver an overall power conversion efficiency (PCE) of 10.13%, which is significantly higher than the 9.72% of the expensive Pt 1 Fe 0 /G counterpart. The obtained results indicate that the Pt x Fe 1- x /G nanohybrids fabricated using atmospheric plasma reaction exhibited potential as a reference for next generation CE materials in highly efficient DSSCs. We believe that this work provides an effective strategy for optimizing Pt utilization for the low-cost and efficient application of DSSCs., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

To reduce the cost of CO 2 capture, polyethylene polyamine (PEPA), with a high amino density and relatively low price, was loaded into MCM-41 to prepare solid sorbents for CO 2 capture from flue gases. In addition, methoxypolyethylene glycol (MPEG) was codispersed and coimpregnated with PEPA to prepare composite sorbents. The pore structures, surface functional groups, adsorption and regeneration properties for the sorbents were measured and characterized. When CO 2 concentration is 15%, for 30, 40 and 50 wt% PEPA-loaded MCM-41, the equilibrium adsorption capacities were respectively determined to be 1.15, 1.47 and 1.66 mmol g -1 at 60 °C; for 30 wt% PEPA and 20 wt% MPEG, 40 wt% PEPA and 10 wt% MPEG, and 50 wt% PEPA and 5 wt% MPEG codispersed MCM-41, the equilibrium adsorption capacities were respectively determined to be 1.97, 2.22 and 2.25 mmol g -1 at 60 °C; the breakthrough and equilibrium adsorption capacities for 50 wt% PEPA and 5 wt% MPEG codispersed MCM-41 respectively reached 2.01 and 2.39 mmol g -1 at 50 °C, all values showed a significant increase compared to PEPA-modified MCM-41. After 10 regenerations, the equilibrium adsorption capacity for codispersed MCM-41 was reduced by 5.0%, with the regeneration performance being better than that of PEPA-loaded MCM-41, which was reduced by 7.8%. The CO 2 -TPD results indicated that the mutual interactions between PEPA and MPEG might change basic sites in MCM-41, thereby facilitating active site exposure and CO 2 adsorption., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)