College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong 518060, People's Republic of China.
Guangdong Flexible Wearable Energy and Tools Engineering Technology Research Centre, Shenzhen University, Shenzhen 518060, People's Republic of China.
Nanotechnology. 2023 Mar 16;34(22). doi: 10.1088/1361-6528/acc038.
Oxygen evolution reaction (OER) is a necessary procedure in various devices including water splitting and rechargeable metal-air batteries but required a higher potential to improve oxygen evolution efficiency due to its slow reaction kinetics. In order to solve this problem, a heterostructured electrocatalyst (CoO@FeO/CC) is synthesized by deposition of iron oxides (FeO) on carbon cloth (CC) via plasma-enhanced atomic layer deposition, then growth of the cobalt oxide (CoO) nanosheet arrays. The deposition cycle of FeOon the CC strongly influences thegrowth and distribution of CoOnanosheets and electronic conductivity of the electrocatalyst. Owing to the high accessible and electroactive areas and improved electrical conductivity, the free-standing electrode of CoO@FeO/CC with 100 deposition cycles of FeOexhibits excellent electrocatalytic performance for OER with a low overpotential of 314.0 mV at 10 mA cmand a small Tafel slope of 29.2 mV decin alkaline solution, which is much better than that of CoO/CC (448 mV), and even commercial RuO(380 mV). This design and optimization strategy shows a promising way to synthesize ideally designed catalytic architectures for application in energy storage and conversion.
氧析出反应（OER）是各种设备（包括水分解和可再充电金属-空气电池）所必需的过程，但由于其缓慢的反应动力学，需要更高的电势来提高氧析出效率。为了解决这个问题，通过等离子体增强原子层沉积在碳布（CC）上沉积氧化铁（FeO），然后生长钴氧化物（CoO）纳米片阵列，合成了异质结构电催化剂（CoO@FeO/CC）。FeO 在 CC 上的沉积循环强烈影响 CoO 纳米片的生长和分布以及电催化剂的电子导电性。由于具有高的可及性和电活性面积以及提高的电导率，具有 100 个 FeO 沉积循环的 CoO@FeO/CC 独立电极在碱性溶液中表现出优异的 OER 电催化性能，在 10 mA cm 时的过电势仅为 314.0 mV，Tafel 斜率为 29.2 mV dec，明显优于 CoO/CC（448 mV），甚至优于商业 RuO（380 mV）。这种设计和优化策略为合成用于储能和转换的理想设计的催化结构展示了一种有前途的方法。
