Miao Bo-Qiang, Liu Yi-Ming, Wang Tian-Jiao, Ding Yu, Chen Yu
Key Laboratory of Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, People's Republic of China.
Nanotechnology. 2021 Nov 25;33(7). doi: 10.1088/1361-6528/ac3702.
For the electrochemcial hydrogen production, the oxygen evolution reaction (OER) is a pivotal half-reaction in water splitting. However, OER suffers sluggish kinetics and high overpotential, leading to the increase of overall energy consumption and decrease of the energy efficiency. In this work, high-quality cobalt oxide porous nanotubes (CoO-PNTs) are easily obtained by simple self-template approach. One-dimensional (1D) porous structure provides the large specific surface area, enough abundant active atoms and effective mass transfer. In addition, CoO-PNTs also own self-stability of 1D architecture, benefitting the their durability for electrocatalytic reaction. Thus, CoO-PNTs with optimal annealing temperature and time reveal the attractive alkaline OER performance (Tafel slope of 56 mV decand 323 mV overpotential at 10 mA cm), which outperform the CoOnanoparticles and benchmark commercial RuOnanoparticles. Furthermore, CoO-PNTs also exhibit excellent OER durability for least 10 h at the 10 mA cm. Overall, CoO-PNTs with low cost can be serve as a highly reactive and economical catalyst for OER.
对于电化学制氢而言，析氧反应（OER）是水分解中的关键半反应。然而，OER存在动力学迟缓以及过电位高的问题，导致整体能耗增加且能量效率降低。在本工作中，通过简单的自模板法可轻松获得高质量的氧化钴多孔纳米管（CoO-PNTs）。一维（1D）多孔结构提供了大的比表面积、足够丰富的活性原子以及有效的传质。此外，CoO-PNTs还具有一维结构的自稳定性，有利于其电催化反应的耐久性。因此，具有最佳退火温度和时间的CoO-PNTs展现出有吸引力的碱性OER性能（在10 mA cm时塔菲尔斜率为56 mV dec且过电位为323 mV），其性能优于氧化钴纳米颗粒和基准商业氧化钌纳米颗粒。此外，CoO-PNTs在10 mA cm下至少10小时还表现出优异的OER耐久性。总体而言，低成本的CoO-PNTs可作为一种高活性且经济的OER催化剂。
