【预告】The Application of Composite Materials in...
2018/3/22 中科院大连化物所

     报告题目：The Application of Composite Materials in Artificial Photosynthesis

     报告时间：2018年3月23日(星期五)下午14:00-15:30

     报告地点：能源基础5号楼二楼会议室(201房间)

     报告人：Dávid F. Srankó, Research fellow - MTA Centre for Energy Research

     报告摘要：

     Although gold andsilver are the most active catalysts for the electrochemical reduction of CO₂ to CO, copper has the unique ability for the production of hydrocarbons. Thereare several examples for improving the catalytic efficiency, e.g., alloyingwith another metal, or enhancing the number of catalytic sites enlarging thesurface roughness by electrochemical or thermal modification. The efficacy islimited by the amount of CO in the reaction. Coupling copper with silver canhave a favorable effect on the ratio of the produced CO, therefore increasingthe amount of C2 products.

     On the other side of the electric cell,increasing the efficiency of the oxidative half-reaction [oxygen evolutionreaction (OER); 2H₂O → O₂ + 4H⁺ + 4e (inacid); 4OH → 2H₂O + O₂ 4e (in base)], - in which therelease of O₂ involves an overall four-electron/four-proton processwith the final formation of an oxygen oxygen bond - is currently one of themost challenging goals in catalysis..

     As an electrocatalyst, more attention hasbeen focused on the Ni(II)-Fe(III) LDH that is the active species of the Fecontaining Ni-based oxygen evolution catalyst (OEC) or Ni Feoxyhydroxide((Ni(Fe)OOH), which is so far the most active OER electrocatalyst under basicconditions. In the brucite-like structure the Fe(III) can easily substitute forthe Ni(II), forming catalytically active, structurally-stabilized Fe sites.Previous findings have conclusively demonstrated the beneficial role of Fe inthe catalytic activity of pure NiOOH. Moreover, Fe(III) has been identified asthe catalytically active site. One possible reason is the distorted octahedralstructure, where the different Fe-O bond lengths seem to indicate that thelocal bond structure around the metal centers plays a crucial role in theactivity.

     In summary, the Ni-Fe-oxyhydroxide has high catalytic activity in OERand the Ni(II)Fe(III)-LDH phase is critical for this activity, although manyquestions remain about the effect of local atomic structure on catalyticactivity.

     报告人简介：

     David F. Sranko (Hungary) is presently aresearch fellow at the Department of Surface Chemistry and Catalysis, at theMTA Centre for Energy Research in Hungary.

     He completed his Master thesis at Universityof Szeged, Szeged, Hungary, as an environmentalist. Holds PhD since 2008 from the same University.

     His scientific career has been in inorganic chemistryand material sciences, synthesis of layered double hydroxides and theirapplication in 2+2 topotactic photodimerization of cinnamic acid derivatives,synthesis of photosensitized iron based OER catalysts and CO₂ electrochemical reduction. In 2016 he has spent 1 year at the Joint Center forArtificial Photosynthesis in Berkeley as a postdoctoral scholar working in theresearch group of Alexis T. Bell.

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