过电位
铱
催化作用
析氧
化学
解吸
吸附
Atom(片上系统)
物理化学
电化学
有机化学
电极
计算机科学
嵌入式系统
作者
Qi Wang,Zhe Zhang,Chao Cai,Maoyu Wang,Zhi Liang Zhao,Menghao Li,Xiang Huang,Shaobo Han,Hua Zhou,Zhenxing Feng,Lei Li,Jun Li,Hu Xu,Joseph S. Francisco,Meng Gu
摘要
Single-atom catalysts (SACs) with 100% active sites have excellent prospects for application in the oxygen evolution reaction (OER). However, further enhancement of the catalytic activity for OER is quite challenging, particularly for the development of stable SACs with overpotentials <180 mV. Here, we report an iridium single atom on Ni2P catalyst (IrSA-Ni2P) with a record low overpotential of 149 mV at a current density of 10 mA·cm–2 in 1.0 M KOH. The IrSA-Ni2P catalyst delivers a current density up to ∼28-fold higher than that of the widely used IrO2 at 1.53 V vs RHE. Both the experimental results and computational simulations indicate that Ir single atoms preferentially occupy Ni sites on the top surface. The reconstructed Ir–O–P/Ni–O–P bonding environment plays a vital role for optimal adsorption and desorption of the OER intermediate species, which leads to marked enhancement of the OER activity. Additionally, the dynamic "top-down" evolution of the specific structure of the Ni@Ir particles is responsible for the robust single-atom structure and, thus, the stability property. This IrSA-Ni2P catalyst offers novel prospects for simplifying decoration strategies and further enhancing OER performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI