Electron Spin Selective Iridium Electrocatalysts for the Oxygen Evolution Reaction
Electron Spin Selective Iridium Electrocatalysts for the Oxygen Evolution Reaction
复制标题
DOI：
10.1021/acsmaterialsau.3c00084
复制
发表时间：
2023-11
期刊：
影响因子：
--
通讯作者：
Carlos J. Mingoes;Bob C. Schroeder;A. J. Jorge Sobrido
中科院分区：
文献类型：
--
作者：
Carlos J. Mingoes;Bob C. Schroeder;A. J. Jorge Sobrido
高效的水电解电催化剂对该技术的广泛商业化至关重要，也是迈向可持续能源未来的重要一步。在这项研究中，提出了一种提高著名电催化剂(Ir)对析氧反应(OER)的电催化活性的替代方法。与未功能化和非手性功能化的Ir纳米粒子(直径2.1±0.2 nm)相比，手性分子功能化的Ir纳米粒子显著增强了OER的活性。与参比氢电极(RHE)相比，在1.55V的电压下，手性功能化Ir纳米粒子的活性比未功能化的Ir纳米粒子平均提高了85%，而非手性功能化Ir纳米粒子的平均活性提高了13%。这种活性的提高归因于手性官能化催化剂上发生的自旋选择性电子转移机制，这一特征是由配体的手性引起的。OER的这种替代途径大大减少了过氧化氢的产生，这一点通过比色法得到了证实。
Highly efficient electrocatalysts for water electrolysis are crucial to the widespread commercialization of the technology and an important step forward toward a sustainable energy future. In this study, an alternative method for boosting the electrocatalytic activity toward the oxygen evolution reaction (OER) of a well-known electrocatalyst (iridium) is presented. Iridium nanoparticles (2.1 ± 0.2 nm in diameter) functionalized with chiral molecules were found to markedly enhance the activity of the OER when compared to unfunctionalized and achiral functionalized iridium nanoparticles. At a potential of 1.55 V vs Reference Hydrogen Electrode (RHE), chiral functionalized iridium nanoparticles exhibited an average 85% enhancement in activity with respect to unfunctionalized iridium nanoparticles compared to an average 13% enhancement for the achiral functionalized iridium nanoparticle. This activity enhancement is attributed to a spin-selective electron transfer mechanism taking place on the chiral functionalized catalysts, a characteristic induced by the chirality of the ligand. This alternative path for the OER drastically reduces the production of hydrogen peroxide, which was confirmed via a colorimetric method.