Oxygen evolution reaction(OER), as the primary anodic reaction, plays a critical role in many electrochemical energy conversion processes. As the state-of-the-art OER catalysts, iridium-based materials are largely hin...Oxygen evolution reaction(OER), as the primary anodic reaction, plays a critical role in many electrochemical energy conversion processes. As the state-of-the-art OER catalysts, iridium-based materials are largely hindered from practical applications mainly due to the extreme scarcity of iridium. Here we demonstrate the successful fabrication of boron-doped amorphous iridium oxide(IrO_(x)-B) via a facile boric acid-assisted method, which realizes an ultrahigh OER mass activity of 2779 A g^(-1)Irat 300 mV overpotential, representing one of the best acidic OER catalysts reported so far.It is found that boric acid can not only facilitate the exposure of Ir, but also dope the amorphous IrOxwith a form of metaborate, which could further modify the electronic and local ligand structure of Ir for the improved intrinsic activity. Interestingly, the reported strategy is universal that can be applied to improve other metal oxide OER catalysts, highlighting a versatile strategy for creating high-performance electrocatalysts with ultrahigh mass activity for OER and beyond.展开更多
基金financially supported by the Ministry of Science and Technology (2017YFA0208200 and 2016YFA0204100)the National Natural Science Foundation of China (22025108 and 51802206)+3 种基金the Natural Science Foundation of Jiangsu Province (BK20180846)the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)the Project of Scientific and Technologic Infrastructure of Suzhou (SZS201905)the Start-up Supports from Xiamen University。
文摘Oxygen evolution reaction(OER), as the primary anodic reaction, plays a critical role in many electrochemical energy conversion processes. As the state-of-the-art OER catalysts, iridium-based materials are largely hindered from practical applications mainly due to the extreme scarcity of iridium. Here we demonstrate the successful fabrication of boron-doped amorphous iridium oxide(IrO_(x)-B) via a facile boric acid-assisted method, which realizes an ultrahigh OER mass activity of 2779 A g^(-1)Irat 300 mV overpotential, representing one of the best acidic OER catalysts reported so far.It is found that boric acid can not only facilitate the exposure of Ir, but also dope the amorphous IrOxwith a form of metaborate, which could further modify the electronic and local ligand structure of Ir for the improved intrinsic activity. Interestingly, the reported strategy is universal that can be applied to improve other metal oxide OER catalysts, highlighting a versatile strategy for creating high-performance electrocatalysts with ultrahigh mass activity for OER and beyond.
