Electro- and Photochemical Water Oxidation on Ligand-free Co3O4 Nanoparticles with Tunable Sizes
Electro- and Photochemical Water Oxidation on Ligand-free Co3O4 Nanoparticles with Tunable Sizes
复制标题
尺寸可调的无配体 Co3O4 纳米粒子的电化学和光化学水氧化
DOI：
10.1021/cs3007523
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发表时间：
2013-03-01
期刊：
影响因子：
12.9
通讯作者：
Wang, Xinchen
中科院分区：
文献类型：
--
作者：
Grzelczak, Marek;Zhang, Jinshui;Wang, Xinchen
在胶体催化剂上将水分解为氢气和氧气是未来能源和化学循环的一种有前途的方法。目前使用的含有昂贵元素（Ru、Ir）的高性能氧化物正逐渐被更可持续的氧化物所取代，例如 Co3O4。尽管纳米颗粒的尺寸决定了它们的催化性能，但对颗粒直径的控制通常很难通过综合实现。另一个障碍是稳定剂的存在，稳定剂是一种阻止可接近的表面活性中心的有机分子。在此，我们展示了对氧化钴纳米颗粒（Co3O4 NP）的尺寸、胶体稳定性和无配体表面的精确控制如何影响光催化析氧的整体性能。因此，我们将光化学结果与电化学研究相关联，得出结论，颗粒表面活性物质的可及性是水氧化的关键参数。
Splitting of water to hydrogen and oxygen on colloidal catalysts is a promising method for future energy and chemistry cycles. The currently used high-performance oxides containing expensive elements (Ru, Ir) are progressively being replaced by more sustainable ones, such as Co3O4. Although the size of the nanoparticles determines their catalytic performance, the control over the particles’ diameter is often synthetically difficult to achieve. An additional obstacle is the presence of stabilizing agent, an organic molecule that blocks accessible surface-active centers. Herein, we present how precise control over size of the cobalt oxide nanoparticles (Co3O4 NPs), their colloidal stability, and the ligand-free surface affect overall performance of the photocatalytic oxygen evolution. We accordingly correlated the photochemical results with the electrochemical studies, concluding that accessibility of the active species on the particles’ surface is crucial parameter in water oxidation.