电催化剂
钇
催化作用
材料科学
热解
产量(工程)
金属
铂金
可逆氢电极
电子转移
无机化学
化学
电极
光化学
冶金
工作电极
电化学
物理化学
有机化学
氧化物
作者
Sanjit Kumar Parida,Bhagyashree A. Chalke,Gurpreet Kaur,Ashok K. Yadav,Hrudananda Jena
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2024-02-14
卷期号:7 (4): 1583-1589
标识
DOI:10.1021/acsaem.3c02911
摘要
As a low-cost alternative to the platinum group metal-free electrocatalysts toward oxygen reduction reaction (ORR), single-atom catalysts (SACs) are gaining attention owing to their unique electronic structure, higher atom utilization efficiency, and improved catalytic activity. Herein, we report the design of a SAC for ORR featuring single atoms of yttrium anchored on a nitrogen-doped carbon matrix (Y–N–C) derived from the Y-doped zeolitic-imidazole framework. The catalyst with 2.93 wt % Y (ICP-OES) demonstrates efficient ORR activity and stability in 0.1 M KOH with onset (Eon) and half-wave (E1/2) potentials of 0.931 and 0.770 V vs RHE, respectively. The catalyst retains 87% of its original current during the short-term stability test for 25 h, comparable to that of Pt/C. Furthermore, the catalyst also demonstrates good selectivity toward 4e– ORR with the electron-transfer number as high as 3.99 and H2O2 yield as low as 0.57% in the potential range 0.4–0.9 V vs RHE. Our work, with a facile one-step pyrolysis approach, adds one more candidate to the series of efforts being made in the pursuits of developing SACs for electrocatalytic applications.
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