利用静电吸引作用提高光催化放氢效率

本文设计合成了两个分别带正电荷和负电荷的Ir(Ⅲ)配合物Ir(ppy)₂(bpy)]⁺(ppy=2-苯基吡啶,bpy=2,2′-联吡啶)和Ir(ppy)₂(pbs)]^-(pbs=1,10-菲啰啉-4,7-二苯磺酸钠)作为光敏剂,以Co(bpy)₃]²⁺为放氢催化剂,比较了Ir(Ⅲ)配合物的光催化放氢效率.发现带负电荷的Ir(Ⅲ)配合物具有更高的光催化放氢效率,带负电荷光敏剂和带正电荷催化剂间的静电吸引可能对放氢效率的提高起到了重要作用.

Use Electrostatic Attraction to Improve the Photocatalytic Hydrogen Evolution Efficiency

Two Ir(Ⅲ) complexes Ir(ppy)2(bpy)]+(ppy=2-phenylpyridine,bpy=2,2′-dipyridyl) and Ir(ppy)2(pbs)]-(pbs=1,10-phenanthroline-4,7-diphenylsulfonic acid disodium salt) bearing one positive and one negative charge,respectively,were designed and synthesized to serve as photosensitizers.Using Co(bpy)3]2+ as hydrogen-evolving catalyst,the photocatalytic hydrogen evolution efficiencies of the two Ir(Ⅲ) complexes were compared.The Ir(Ⅲ) complex bearing one negative charge exhibits much higher photocatalytic hydrogen evolution activity than the Ir(Ⅲ) complex bearing one positive charge.It was confirmed that the electrostatic attraction between the negatively charged photosensitizer and positively charged catalyst plays an important role.