Highly Active Oxygen Evolution on Carbon Fiber Paper Coated with Atomic-Layer-Deposited Cobalt Oxide,ACS Applied Materials & Interfaces

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Highly Active Oxygen Evolution on Carbon Fiber Paper Coated with Atomic-Layer-Deposited Cobalt Oxide
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-02-25 00:00:00 , DOI: 10.1021/acsami.8b19064
Hyung Jong Choi ₁ , Gwon Deok Han ₁ , Kiho Bae _{1,

2} , Joon Hyung Shim ₁

Affiliation

In this work, we evaluated the oxygen evolution performance of cobalt oxide (CoO_x)-coated carbon fiber paper in electrochemical water splitting. For a uniform coating of CoO_x layers along the carbon fiber paper, the atomic layer deposition (ALD) technique was applied. We achieved a uniform and conformal coating of atomic-layer-deposited CoO_x (ALD-CoO_x) on the carbon fiber paper. The overpotential for oxygen evolution measured for the optimized ALD-coated carbon fiber paper was as low as 343 mV at 10 mA cm^–2, which is competitive with the activity of state-of-the-art CoO_x prepared on electrodes with large surface areas. Oxygen evolution is not enhanced after a critical thickness, about 28 nm in our study, is reached. The optimal thickness of the ALD-CoO_x film is dependent on two competing effects: the high oxidation state of cobalt ions in thicker CoO_x helps the oxygen evolution, whereas the introduction of a thick oxide coating decelerates the rate of charge transfer at the surface.

中文翻译：

原子层沉积氧化钴涂覆的碳纤维纸上的高活性氧析出

在这项工作中，我们评估了氧化钴（CoO _x）涂层碳纤维纸在电化学水分解中的析氧性能。为了沿碳纤维纸均匀涂覆CoO _x层，应用了原子层沉积（ALD）技术。我们在碳纤维纸上获得了均匀且保形的原子层沉积CoO _x（ALD-CoO _x）涂层。经过优化的ALD涂层碳纤维纸在10 mA cm ^–2时测得的析出氧的超电势低至343 mV，与最先进的CoO _x的活性相比具有竞争优势。在具有大表面积的电极上制备。达到我们研究中的约28 nm的临界厚度后，氧气的释放并没有增强。ALD-CoO _x膜的最佳厚度取决于两个相互竞争的效应：较厚的CoO _x中钴离子的高氧化态有助于氧气的释放，而较厚的氧化物涂层的引入则降低了表面电荷转移的速率。

更新日期：2019-02-25

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