近日，北京科技大学秦明礼教授及其研究小组发现介孔单晶颗粒作为强效酸性析氧催化剂。这一研究成果发表在2025年4月8日出版的国际学术期刊《美国化学会杂志》上。

铱（Ir）的稀缺性限制了其在酸性析氧反应（OER）中的广泛应用。

本文开发了具有原子分散低价态Ir的介孔单晶尖晶石Co₃O₄，使Ir得到高效稳定的利用。表面Ptheirbaix图表明，在酸性OER条件下，O*完全覆盖了Co₃O₄（111）和（110）表面，钝化了Co位点，增强了Co₃O₄的结构稳定性，通过Ir掺杂进一步提高了这一优势。介孔为Ir单原子提供了大量的负载位点（13.8 wt %），通过创造高本然活性的Co-Ir桥位，激活了原来O*钝化的Co₃O₄（111）表面；同时，与常规Ir/Co₃O₄催化剂相比，Ir和Co的浸出率分别降低到1/4和1/5左右。催化剂的低η₁₀值为248mv，持续时间超过100 h，显示了其在水电解中的潜力。

附：英文原文

Title: Mesoporous Single-Crystalline Particles as Robust and Efficient Acidic Oxygen Evolution Catalysts

Author: Yong Wang, Yunpu Qin, Sijia Liu, Yongzhi Zhao, Luan Liu, Di Zhang, Shangqing Zhao, Jianfang Liu, Jie Wang, Yadong Liu, Haoyang Wu, Baorui Jia, Xuanhui Qu, Hao Li, Mingli Qin

Issue&Volume: April 8, 2025

Abstract: The scarcity of iridium (Ir) limits its widespread use in acidic oxygen evolution reaction (OER). Herein, mesoporous single-crystalline spinel Co3O4 with atomically dispersed low-valence-state Ir has been developed to enable Ir’s efficient and stable utilization. The surface Pourbaix diagram suggests that under acidic OER conditions, O* fully covers both Co3O4(111) and (110) surfaces, passivating Co sites but enhancing Co3O4’s structural stability, a benefit further improved by Ir doping. Mesopores offer numerous loading sites for Ir single atoms (13.8 wt %), which activate the originally O*-passivated Co3O4(111) surface by creating high-intrinsic-activity Co–Ir bridge sites; meanwhile, Ir and Co leaching rates are reduced to about 1/4 and 1/5, respectively, compared to conventional Ir/Co3O4 catalysts. Our catalyst exhibits a low η10 of 248 mV for over 100 h, showcasing its potential in water electrolysis.

DOI: 10.1021/jacs.4c18390

Source: https://pubs.acs.org/doi/full/10.1021/jacs.4c18390