Institute of Organic Chemistry, Laboratory for Sustainable Chemistry and Catalysis (LSusCat), Johannes Kepler University (JKU), Altenberger Straße 69, 4040, Linz, Austria.
Institute of Applied Chemistry, Department of Science and Technology, IMC University of Applied Sciences Krems Wien, Piaristengasse 1, 3500, Krems, Austria.
Angew Chem Int Ed Engl. 2023 May 15;62(21):e202302208. doi: 10.1002/anie.202302208. Epub 2023 Apr 13.
As alternative energy sources are essential to reach a climate-neutral economy, hydrogen peroxide (H O ) as futuristic energy carrier gains enormous awareness. However, seeking for stable and electrochemically selective H O ORR electrocatalyst is yet a challenge, making the design of-ideally-bifunctional catalysts extremely important and outmost of interest. In this study, we explore the application of a trimetallic cobalt(II) triazole pyridine bis-[cobalt(III) corrole] complex Co TP[Co C] 3 in OER and ORR catalysis due to its remarkable physicochemical properties, fast charge transfer kinetics, electrochemical reversibility, and durability. With nearly 100 % selective catalytic activity towards the two-electron transfer generated H O , an ORR onset potential of 0.8 V vs RHE and a cycling stability of 50 000 cycles are detected. Similarly, promising results are obtained when applied in OER catalysis. A relatively low overpotential at 10 mA cm of 412 mV, Faraday efficiency 98 % for oxygen, an outstanding Tafel slope of 64 mV dec combined with superior stability.
作为实现气候中和经济的必要手段，过氧化氢（H2O2）作为未来的能源载体引起了极大的关注。然而，寻找稳定且电化学选择性的 H2O2ORR 电催化剂仍然是一个挑战，这使得设计理想的双功能催化剂变得非常重要且极具吸引力。在这项研究中，我们探索了一种三金属钴（II）三唑吡啶双[钴（III）叶啉]配合物 CoTP[CoC]3 在 OER 和 ORR 催化中的应用，因为它具有显著的物理化学性质、快速的电荷转移动力学、电化学可逆性和耐久性。该配合物对两电子转移生成的 H2O2 具有近 100%的选择性催化活性，检测到的 ORR 起始电位为 0.8 V vs RHE，循环稳定性为 50000 次循环。同样，在 OER 催化中也获得了有前景的结果。在 10 mA cm 的低过电势为 412 mV，氧气的法拉第效率为 98%，出色的 Tafel 斜率为 64 mV dec，同时具有优异的稳定性。
