Zeng Lingyou, Zhao Zhonglong, Lv Fan, Xia Zhonghong, Lu Shi-Yu, Li Jiong, Sun Kaian, Wang Kai, Sun Yingjun, Huang Qizheng, Chen Yan, Zhang Qinghua, Gu Lin, Lu Gang, Guo Shaojun
School of Materials Science and Engineering, Peking University, Beijing, China.
School of Physical Science and Technology, Inner Mongolia University, Hohhot, China.
Nat Commun. 2022 Jul 2;13(1):3822. doi: 10.1038/s41467-022-31406-0.
As the most well-known electrocatalyst for cathodic hydrogen evolution in water splitting electrolyzers, platinum is unfortunately inefficient for anodic oxygen evolution due to its over-binding with oxygen species and excessive dissolution in oxidative environment. Herein we show that single Pt atoms dispersed in cobalt hydrogen phosphate with an unique Pt(OH)(O)/Co(P) coordination can achieve remarkable catalytic activity and stability for oxygen evolution. The catalyst yields a high turnover frequency (35.1 ± 5.2 s) and mass activity (69.5 ± 10.3 A mg) at an overpotential of 300 mV and excellent stability. Mechanistic studies elucidate that the superior catalytic performance of isolated Pt atoms herein stems from optimal binding energies of oxygen intermediate and also their strong electronic coupling with neighboring Co atoms that suppresses the formation of soluble Pt species. Alkaline water electrolyzers assembled with an ultralow Pt loading realizes an industrial-level current density of 1 A cm at 1.8 volts with a high durability.
作为水电解槽中阴极析氢最著名的电催化剂，不幸的是，由于铂与氧物种的过度结合以及在氧化环境中的过度溶解，它在阳极析氧方面效率低下。在此我们表明，分散在磷酸钴氢中的单个铂原子具有独特的Pt(OH)(O)/Co(P)配位，能够实现显著的析氧催化活性和稳定性。该催化剂在300 mV的过电位下具有高周转频率（35.1±5.2 s）和质量活性（69.5±10.3 A mg），并且稳定性优异。机理研究表明，此处孤立铂原子的卓越催化性能源于氧中间体的最佳结合能，以及它们与相邻钴原子的强电子耦合，这抑制了可溶性铂物种的形成。采用超低铂负载组装的碱性水电解槽在1.8伏电压下实现了1 A cm的工业级电流密度，且耐久性高。
