Park Yu Jin, Lee Jooyoung, Park Yoo Sei, Yang Juchan, Jang Myeong Je, Jeong Jaehoon, Choe Seunghoe, Lee Jung Woo, Kwon Jung-Dae, Choi Sung Mook
Surface Technology Division, Materials Center for Energy Department, Korea Institute of Materials Science, Changwon, South Korea.
Department of Materials Science and Engineering, Pusan National University, Busan, South Korea.
Front Chem. 2020 Oct 23;8:593272. doi: 10.3389/fchem.2020.593272. eCollection 2020.
Under acidic conditions, IrO exhibits high catalytic activity with respect to the oxygen evolution reaction (OER). However, the practical application of Ir-based catalysts is significantly limited owing to their high cost in addition to the scarcity of the metal. Therefore, it is necessary to improve the efficiency of the utilization of such catalysts. In this study, IrO-coated Ti felt (IrO/Ti) electrodes were prepared as high-efficiency catalysts for the OER under acidic conditions. By controlling the surface roughness of the Ti substrate via wet etching, the optimum Ti substrate surface area for application in the IrO/Ti electrode was determined. Additionally, the IrO film that was electrodeposited on the 30 min etched Ti felt had a large surface area and a uniform morphology. Furthermore, there were no micro-cracks and the electrode obtained (IrO/Ti-30) exhibited superior catalytic performance with respect to the OER, with a mass activity of 362.3 A at a potential of 2.0 V (vs. RHE) despite the low Ir loading (0.2 mg cm). Therefore, this proposed strategy for the development of IrO/Ti electrodes with substrate surface control wet etching has potential for application in the improvement of the efficiency of catalyst utilization with respect to the OER.
在酸性条件下，IrO对析氧反应（OER）表现出高催化活性。然而，基于Ir的催化剂的实际应用受到显著限制，这是由于其成本高以及金属稀缺。因此，有必要提高此类催化剂的利用效率。在本研究中，制备了IrO包覆的钛毡（IrO/Ti）电极作为酸性条件下OER的高效催化剂。通过湿法蚀刻控制钛基底的表面粗糙度，确定了用于IrO/Ti电极的最佳钛基底表面积。此外，电沉积在蚀刻30分钟的钛毡上的IrO薄膜具有大表面积和均匀形态。而且，没有微裂纹，所获得的电极（IrO/Ti-30）对OER表现出优异的催化性能，尽管Ir负载量低（0.2 mg cm），在2.0 V（相对于可逆氢电极）的电位下质量活性为362.3 A。因此，这种通过湿法蚀刻控制基底表面来开发IrO/Ti电极的策略在提高OER催化剂利用效率方面具有应用潜力。
