Xie Ying, Qiu Jinfeng, Chen Guangliang, Guo Yingchun, Tang Peisong, He Bin
Key Laboratory for Rare Earth Chemistry and Application of Liaoning Province, College of Science, Shenyang University of Chemical Technology, Shenyang 110000, Liaoning, P. R. China.
Huzhou Key Laboratory of Environmental Functional Materials and Pollution Control, Huzhou University, Huzhou 313000, P. R. China.
Inorg Chem. 2024 Aug 19;63(33):15467-15476. doi: 10.1021/acs.inorgchem.4c02591. Epub 2024 Aug 6.
The sluggish kinetics of the oxygen evolution reaction (OER) in alkaline water electrolysis remains a significant challenge for developing high-efficiency electrocatalytic systems. In this study, we present a three-dimensional, micrometer-sized iridium oxide (IrO)decorated cobalt carbonate hydroxide (IrO-P-CoCH) electrocatalyst, which is engineered in situ on a carbon cloth (CC) substrate pretreated with atmospheric-pressure dielectric barrier discharge (DBD) plasma (PCC). The electrocatalyst features petal-like structures composed of nanosized rods, providing abundant reactive areas and sites, including the oxygen vacancy caused by the air-DBD plasma. As a result, the IrO-P-CoCH/PCC electrocatalyst demonstrates an outstanding OER performance, with overpotentials of only 190 and 300 mV required to achieve current densities of 10 mA cm () and 300 mA cm (), respectively, along with a low Tafel slope of 48.1 mV dec in 1.0 M KOH. Remarkably, benefiting from rich active sites exposed on the IrO-P-CoCH (Ir) heterostructure, the synergistic effect between IrO and CoCH enhances the charge delivery rates, and the IrO-P-CoCH/PCC exhibits a superior electrocatalytic activity at a high current density (300 mV/) compared to the commercial benchmarked RuO/PCC (470 mV). Furthermore, the IrO-P-CoCH/PCC electrocatalyst shows exceptional OER stability, with a mere 1.3% decrease with a current density of for 100 h testing, surpassing most OER catalysts based on CC substrates. This work introduces a novel approach for designing high-performance OER electrocatalysts on flexible electrode substrates.
碱性水电解中析氧反应（OER）缓慢的动力学仍然是开发高效电催化系统的重大挑战。在本研究中，我们展示了一种三维微米尺寸的氧化铱（IrO）修饰的氢氧化碳酸钴（IrO-P-CoCH）电催化剂，它是在经过大气压介质阻挡放电（DBD）等离子体预处理的碳布（CC）基底（PCC）上原位构建的。该电催化剂具有由纳米棒组成的花瓣状结构，提供了丰富的反应区域和位点，包括由空气-DBD等离子体引起的氧空位。结果，IrO-P-CoCH/PCC电催化剂表现出出色的OER性能，在1.0 M KOH中，分别达到10 mA cm⁻²和300 mA cm⁻²的电流密度仅需190和300 mV的过电位，同时具有48.1 mV dec⁻¹的低塔菲尔斜率。值得注意的是，得益于IrO-P-CoCH（Ir）异质结构上暴露的丰富活性位点，IrO和CoCH之间的协同效应提高了电荷传递速率，与商业基准RuO₂/PCC（470 mV）相比，IrO-P-CoCH/PCC在高电流密度（300 mA cm⁻²）下表现出优异的电催化活性。此外，IrO-P-CoCH/PCC电催化剂表现出卓越的OER稳定性，在100 h测试中，电流密度为 时仅下降1.3%，超过了大多数基于CC基底的OER催化剂。这项工作为在柔性电极基底上设计高性能OER电催化剂引入了一种新方法。
