单原子金属氧化物的创纪录光催化速率
Record-high photocatalytic rate at single atomic metal oxide
摘要：
金属氧化物在环境修复与保护、能源转换与储存等方面得到了广泛的研究和应用。这些不同的应用中的大多数是金属氧化物的电子状态的巨大多样性的结果。然而，值得注意的是，许多金属氧化物在催化中的应用存在障碍，因为这些材料中的活性中心密度低。氧化物催化剂的尺寸减小是提高活性中心密度的策略。在这里，我们展示了单原子金属氧化物的制造，其中氧化物尺寸达到最小值。然而，这种SATO中的催化机制是由准原子物理决定的，这与传统的尺寸效应有根本区别，也与标准的凝聚态物理相反。SATO导致创纪录的高和稳定的阳光光催化降解率为0.24，这超过了可用的光催化剂约两个数量级。该光催化过程是通过准原子物理机制实现的，其中自旋上通道中的电子从HOMO激发到LUMO+1态，这只能在SATO中与W5+发生。
英文摘要：
Metal oxides have been extensively investigated and applied in environmental remediation and protection, energy conversion and storage. Most of these diverse applications are results of a large diversity of the electronic states of metal oxides. Noticeably, however, numerous metal oxides have obstacles for applications in catalysis because of low density of active sites in these materials. Size reduction of oxide catalyst is a strategy to improve the active site density. Here, we demonstrate the fabrication of single atomic metal oxide in which the oxide size reaches its minimum. However, the catalytic mechanism in this SATO is determined by a quasi atom physics which is fundamentally distinct from the traditional size effect, and also is in contrast to the standard condensed matter physics. SATO results in a record high and stable sunlight photocatalytic degradation rate of 0.24, which exceeds those of available photocatalysis by approximately two orders of magnitude. The photocatalytic process is enabled by a quasi atom physical mechanism, in which, an electron in the spin up channel is excited from HOMO to LUMO+1 state, which can only occur in SATO with W5+.
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