铱
析氧
材料科学
氧气
氧化还原
金属
催化作用
兴奋剂
光化学
无机化学
物理化学
电化学
化学
电极
生物化学
光电子学
有机化学
冶金
作者
Ansheng Wang,Wanying Wang,Jinchao Xu,Ao Zhu,Chunning Zhao,Meng Yu,Guoliang Shi,Jiaguo Yan,Shuhui Sun,Weichao Wang
标识
DOI:10.1002/aenm.202302537
摘要
Abstract Since the active sites in catalytic systems are either metal sites or lattice oxygen, simultaneously triggering metal and lattice oxygen redox pair with low energy barriers is expected to provide diversified and efficient sites to accelerate oxygen evolution reaction (OER) kinetics, but this is a great challenge. Herein, Ir species (Ir clusters and Ir single atoms) loaded on Ni‐doped Co 3 O 4 is designed (Ir/Ni‐Co 3 O 4 ), where metallic Ir clusters downsize to spread into high‐density Ir single atoms to load on reconstruction‐derived Ni‐doped CoOOH. In situ spectroscopy, isotope‐labeled, and chemical probe experiments demonstrate that metal site and lattice oxygen are simultaneously activated to participate in the OER. Further theoretical studies demonstrate that the Co site is the most favorable site to promote the OER through an adsorbate evolution mechanism with a low energy barrier of 1.69 eV. The Ni cooperating with Ir atoms synergistically upshifts energy positions of the O p band centers. Thus, the lattice O that bridges Ni and Ir atoms is activated to participate in the OER via coupling with adsorbed O on the Ir site to fulfill O─O bond formation. Benefiting from the conjoint participation of the metal and lattice oxygen redox pair, Ir/Ni‐Co 3 O 4 affords extremely low OER overpotentials of 177 and 263 mV at corresponding 10 and 500 mA cm −2 .
科研通智能强力驱动
Strongly Powered by AbleSci AI