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Title: Boosting ORR performance by single atomic divacancy Zn–N₃C–C₈ sites on ultrathin N-doped carbon nanosheets
Authors: Zhang, Tianyu
Wang, Fanping
Yang, Can
Han, Xu
Liang, Chen
Zhang, Zedong
Li, Yaping
Han, Aijuan
Liu, Junfeng
Liu, Bin
Keywords: Engineering::Chemical engineering
Issue Date: 2022
Source: Zhang, T., Wang, F., Yang, C., Han, X., Liang, C., Zhang, Z., Li, Y., Han, A., Liu, J. & Liu, B. (2022). Boosting ORR performance by single atomic divacancy Zn–N₃C–C₈ sites on ultrathin N-doped carbon nanosheets. Chem Catalysis, 2(4), 836-852.
Journal: Chem Catalysis 
Abstract: Single-atom catalysts (SACs) show great promise to improve the performance of catalysis because of their spatially isolated single-atom sites with unique electronic properties. Herein, we construct single Zn atoms anchored on ultrathin two-dimensional (2D) N-doped carbon nanosheets (Zn–SAs/UNCNS) as an efficient electrocatalyst for oxygen reduction reaction (ORR). The microenvironment of Zn–SAs/UNCNS with super ORR intrinsic activity was identified as the divacancy Zn–N3C–C8 by both experiments and theoretical simulations. Density functional theory (DFT) calculations reveal that the divacancy Zn–N3C–C8 sites exhibit near-Fermi electronic states distinct from those of graphene-enclosed Zn–N4–C10 and divacancy trans-Zn–N2C2–C8 sites, which greatly facilitate the ORR process. Furthermore, compared with 3D architecture, the single atomic divacancy Zn–N3C–C8 sites anchored on ultrathin 2D carbon nanosheets show more active site exposure and fast electron transport, which collectively boost the ORR performance, showing a high half-wave potential of 0.91 V versus reversible hydrogen electrode [RHE] and a super turnover frequency (4.99 e− site−1 s−1).
ISSN: 2667-1093
DOI: 10.1016/j.checat.2022.02.006
Schools: School of Chemical and Biomedical Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2022 Elsevier Inc. This is an open-access article distributed under the terms of the Creative Commons CC-BY-NC-ND license.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles
SPMS Journal Articles

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