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Title: Lattice strain and atomic replacement of CoO₆ octahedra in layered sodium cobalt oxide for boosted water oxidation electrocatalysis
Authors: Sun, Lan 
Dai, Zhengfei
Zhong, Lixiang
Zhao, Yiwei
Cheng, Yan
Chong, Shaokun
Chen, Guanjun
Yan, Chunshuang
Zhang, Xiaoyu
Tan, Huiteng
Zhang, Long
Dinh, Khang Ngoc
Li, Shuzhou
Ma, Fei
Yan, Qingyu
Keywords: Engineering::Materials::Energy materials
Issue Date: 2021
Source: Sun, L., Dai, Z., Zhong, L., Zhao, Y., Cheng, Y., Chong, S., Chen, G., Yan, C., Zhang, X., Tan, H., Zhang, L., Dinh, K. N., Li, S., Ma, F. & Yan, Q. (2021). Lattice strain and atomic replacement of CoO₆ octahedra in layered sodium cobalt oxide for boosted water oxidation electrocatalysis. Applied Catalysis B: Environmental, 297, 120477-.
Project: 2017-T2-2-069 
Journal: Applied Catalysis B: Environmental 
Abstract: Layered alkali metal oxides have been emerged as an alternative group with low-cost and promising electrocatalysts in water oxidation. The distinct layered configuration may offer some interesting possibilities to tune the intrinsic activity by regulating the intralayer edge-shared CoO6 octahedra and the CoO2 interlayer spacing/strain. In this work, electrochemical desodiation tuning method is explored on intralayer Ag, Cu, Ce-doped Na0.7CoO2 for highly active OER catalysts. It is demonstrated that the ΔGOH* value in the volcano plot is optimized by proper desodiation. Meanwhile, the lattice strain introduced along with the desodiated process modulates the ΔGOH*, according to first principle calculations. It shows that ~0.157% compressive strain in the CoO2 layers and ~1% tensile strain between CoO2 layers are introduced in the desodiated Ag doped Na0.7CoO2. Among these catalysts, the desodiated Ag-Na0.7CoO2 sample exhibits an optimal RuO2-beyond water oxidation (OER) activity with the lowest overpotential of 236 mV@10 mA/cm2, the smallest Tafel slope of 48 mV/dec and the highest mass current density of 227.8 A/g. This work provides an interesting avenues to optimize existing layered materials with inter/intralayer modifications for highly efficient water oxidation electrolysis.
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2021.120477
Schools: School of Materials Science and Engineering 
Rights: © 2021 Elsevier B.V. All rights reserved. This paper was published in Applied Catalysis B: Environmental and is made available with permission of Elsevier B.V.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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