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Title: Two-dimensional palladium diselenide for the oxygen reduction reaction
Authors: Koh, See Wee
Hu, Jie
Hwang, Jeemin
Yu, Peng
Sun, Zixu
Liu, Qiunan
Hong, Wei
Ge, Junyu
Fei, Jipeng
Han, Byungchan
Liu, Zheng
Li, Hong
Keywords: Engineering::Chemical engineering
Issue Date: 2021
Source: Koh, S. W., Hu, J., Hwang, J., Yu, P., Sun, Z., Liu, Q., Hong, W., Ge, J., Fei, J., Han, B., Liu, Z. & Li, H. (2021). Two-dimensional palladium diselenide for the oxygen reduction reaction. Materials Chemistry Frontiers, 5(13), 4970-4980.
Project: M408050000
Journal: Materials Chemistry Frontiers
Abstract: The emerging two-dimensional (2D) materials, particularly 2D transition metal dichalcogenides (TMDs), show great potential for catalysis due to their extraordinary large surface areas and tuneable activities. However, the as-synthesized TMDs are usually chemically inert because of their perfect atomic structure and inaccessible interlayer space for electrolytes. Herein, we activate 2D palladium diselenide (PdSe2) for catalysing the oxygen reduction reaction using a controllable electrochemical intercalation process. The electrochemically activated PdSe2 exhibits greatly enhanced electrocatalytic activities such as a doubled current density, 250 mV positive shift of potential, 5 times smaller Tafel slope, and greatly improved stability. DFT calculations were employed to study the mechanisms of electrochemical activation. Complementary experimental and theoretical studies suggest that the significantly increased activities come from (1) the activated surface with enriched Se vacancies and chemically bonded oxygen, and (2) easy access of the interlayer space for reaction intermediates. Furthermore, the robustness of the Pd-Se bonding ensures high structural stability and excellent resistance to degradation.
ISSN: 2052-1537
DOI: 10.1039/d0qm01113d
Rights: © 2021 The Royal Society of Chemistry and the Chinese Chemical Society. All rights reserved. This paper was published in Materials Chemistry Frontiers and is made available with permission of The Royal Society of Chemistry and the Chinese Chemical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles
MSE Journal Articles

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