Surface Catalysis of Water Oxidation by the Blue Ruthenium Dimer

Surface Catalysis of Water Oxidation by the Blue Ruthenium Dimer
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DOI:
10.1021/ic100469x
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发表时间:
2010-05-03
影响因子:
4.6
通讯作者:
Meyer, Thomas J.
Meyer, Thomas J.
中科院分区:
化学2区
文献类型:
--
作者:
Jurss, Jonah W.;Concepcion, Javier C.;Meyer, Thomas J.

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多电子催化的单电子活化已被证明是可行的,在催化水氧化与逐步质子耦合电子转移,导致高能量的催化前体。对于蓝色二聚体crs,cis-[(bpy)(2)(H2O)(RuORuIII)-O-III(H2O)(bpy)(2)](4+),水氧化的第一个明确定义的分子催化剂,发生逐步4 e(-)/4 H(+)氧化,得到反应性前体[(O)(RuORuV)-O-V(O)](4+)。在未改性的金属氧化物表面上,该关键中间体是动力学上不可接近的,其中唯一可用的氧化还原途径是电子转移。我们在这里报道了在[Ru(4,4 '-((HO)(2)P(O)CH 2)(2)bpy)(2)(bpy)](2+)的表面膦酸盐结合所衍生的电极上,蓝色二聚体对铟锡氧化物(In 2 O3:Sn)电极催化水氧化的显著表面活化。
Single-electron activation of multielectron catalysis has been shown to be viable in catalytic water oxidation with stepwise proton-coupled electron transfer, leading to high-energy catalytic precursors. For the blue dimer, crs,cis-[(bpy)(2)(H2O)(RuORuIII)-O-III(H2O)(bpy)(2)](4+), the first well-defined molecular catalyst for water oxidation, stepwise 4e(-)/4H(+) oxidation occurs to give the reactive precursor [(O)(RuORuV)-O-V(O)](4+). This key intermediate is kinetically inaccessible at an unmodified metal oxide surface, where the only available redox pathway is electron transfer We report here a remarkable surface activation of indium-tin oxide (In2O3:Sn) electrodes toward catalytic water oxidation by the blue dimer at electrodes denvatized by surface phosphonate binding of [Ru(4,4'-((HO)(2)P(O)CH2)(2)bpy)(2)(bpy)](2+) Surface binding dramatically improves the rate of surface oxidation of the blue dimer and induces water oxidation catalysis