In situ formation of an oxygen-evolving catalyst in neutral water containing phosphate and Co2+
In situ formation of an oxygen-evolving catalyst in neutral water containing phosphate and Co2+
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DOI：
10.1126/science.1162018
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发表时间：
2008-08-22
期刊：
影响因子：
56.9
通讯作者：
Nocera, Daniel G.
中科院分区：
文献类型：
--
作者：
Kanan, Matthew W.;Nocera, Daniel G.
太阳能的大规模利用需要其储存。在自然光合作用中，来自阳光的能量被用来将水的键重新排列为氧和氢的等价物。实现进行“水分解”的人工系统需要催化剂，该催化剂从水中产生氧气而不需要过度的驱动电位。在这里，我们报告这样的催化剂，形成后的氧化极化的惰性铟锡氧化物电极在磷酸盐缓冲水中含有钴（II）离子。各种分析技术表明，在该材料中，磷酸盐与钴的比例约为1：2。催化活性的pH依赖性还暗示磷酸氢根离子在产氧反应中作为质子受体。该催化剂不仅由地球丰富的材料原位形成，而且在环境条件下在中性水中操作。
The utilization of solar energy on a large scale requires its storage. In natural photosynthesis, energy from sunlight is used to rearrange the bonds of water to oxygen and hydrogen equivalents. The realization of artificial systems that perform "water splitting" requires catalysts that produce oxygen from water without the need for excessive driving potentials. Here we report such a catalyst that forms upon the oxidative polarization of an inert indium tin oxide electrode in phosphate- buffered water containing cobalt (II) ions. A variety of analytical techniques indicates the presence of phosphate in an approximate 1: 2 ratio with cobalt in this material. The pH dependence of the catalytic activity also implicates the hydrogen phosphate ion as the proton acceptor in the oxygen- producing reaction. This catalyst not only forms in situ from earth- abundant materials but also operates in neutral water under ambient conditions.