Tailoring the composition and morphology of electrocatalysts has been regarded as an effective alternative to improve their catalytic performance by forming and exposing more active sites. Herein a rapid thermal annealing (RTA) strategy is proposed to mass produce 2D cobalt-fluoride-oxide phase electrocatalysts in air at 400 °C (CFO-RH400) from crystalline fluoride hydrates, with critical steps including the thermal expansion of the water molecule, the exfoliation of CoF₂ nanosheets, and the subsequent oxidation. The regulated electronic structure of the active cobalt oxide phase by sufficient fluoride anions leads to a closer O p-band center relative to the Fermi level based on our theoretical simulations. Therefore, the as-prepared 2D CFO-RH400 exhibits superior electrocatalytic activity and durability toward the oxygen evolution reaction.

中文翻译：

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快速热退火，以高质量的二维氟化钴作为一种先进的析氧电催化剂

定制电催化剂的组成和形态已被认为是通过形成和暴露更多的活性位点来改善其催化性能的有效选择。本文提出了一种快速热退火（RTA）策略，以在400°C（CFO-RH400）的空气中由晶体氟化物水合物大规模生产2D氟化钴氧化物相电催化剂，关键步骤包括水分子的热膨胀， CoF ₂剥落纳米片，以及随后的氧化。根据我们的理论模拟，足够的氟阴离子对活性钴氧化物相的调节电子结构会导致其相对于费米能级的O p带中心更近。因此，所制备的2D CFO-RH400表现出优异的电催化活性和对氧释放反应的耐久性。