Surface reconstruction determines the fate of catalytic sites on the near-surface during the oxygen evolution reaction. However, deciphering the conversion mechanism of various intermediate-states during surface reconstruction remains a challenge. Herein, we employed an optical imaging technique to draw the landscape of dynamic surface reconstruction on individual Co 3 O 4 nanoparticles. By regulating the surface states of Co 3 O 4 nanoparticles, we explored dynamic growth of the CoO x (OH) y sublayer on single Co 3 O 4 nanoparticles and directly identified the conversion between two dynamics. Rich oxygen vacancies induced more active sites on the surface and prolonged surface reconstruction, which enhanced electrochemical redox and oxygen evolution. These results were further verified by in situ electrochemical extinction spectroscopy of single Co 3 O 4 nanoparticles. We elucidate the heterogeneous evolution of surface reconstruction on individual Co 3 O 4 nanoparticles and present a unique perspective to understand the fate of catalytic species on the nanosurface, which is of enduring significance for investigating the heterogeneity of multielectron-transfer events.

中文翻译：

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光学原位破译单个Co 3 O 4 纳米粒子的表面重建-辅助多电子转移事件


表面重建决定了析氧反应过程中近表面催化位点的命运。然而，破译表面重建过程中各种中间态的转换机制仍然是一个挑战。在这里，我们采用光学成像技术在单个 Co 上绘制动态表面重建的景观。 3氧4纳米颗粒。通过调节Co的表面状态3氧4纳米粒子，我们探索了 CoO 的动态生长x （哦） y单Co上的子层3氧4纳米颗粒并直接识别两种动力学之间的转换。丰富的氧空位在表面诱导更多的活性位点并延长表面重建时间，从而增强电化学氧化还原和析氧。这些结果通过单Co的原位电化学消光光谱得到进一步验证。 3氧4纳米颗粒。我们阐明了单个 Co 表面重建的异质演化3氧4纳米颗粒并为理解纳米表面催化物质的命运提供了独特的视角，这对于研究多电子转移事件的异质性具有持久的意义。