Engineering Electronic Structure of Nitrogen-Carbon Sites by sp 3 -Hybridized Carbon and Incorporating Chlorine to Boost Oxygen Reduction Activity.

Autor: Feng X; Institute of Flexible Electronics (IFE), Ningbo Institute, and Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China., Chen G; Institute of Flexible Electronics (IFE), Ningbo Institute, and Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China., Cui Z; Institute of Flexible Electronics (IFE), Ningbo Institute, and Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China., Qin R; Institute of Flexible Electronics (IFE), Ningbo Institute, and Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China., Jiao W; Institute of Flexible Electronics (IFE), Ningbo Institute, and Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China., Huang Z; Institute of Flexible Electronics (IFE), Ningbo Institute, and Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China., Shang Z; Institute of Flexible Electronics (IFE), Ningbo Institute, and Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China., Ma C; Department of Chemistry, Tsinghua University, Beijing, 100084, China., Zheng X; National Synchrotron Radiation Laboratory University of Science and Technology of China, Hefei, Anhui, 230029, China., Han Y; Institute of Flexible Electronics (IFE), Ningbo Institute, and Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China., Huang W; Institute of Flexible Electronics (IFE), Ningbo Institute, and Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2024 Jan 02; Vol. 63 (1), pp. e202316314. Date of Electronic Publication: 2023 Nov 30.
DOI: 10.1002/anie.202316314
Abstrakt: Development of efficient and easy-to-prepare low-cost oxygen reaction electrocatalysts is essential for widespread application of rechargeable Zn-air batteries (ZABs). Herein, we mixed NaCl and ZIF-8 by simple physical milling and pyrolysis to obtain a metal-free porous electrocatalyst doped with Cl (mf-pClNC). The mf-pClNC electrocatalyst exhibits a good oxygen reduction reaction (ORR) activity (E 1/2 =0.91 V vs. RHE) and high stability in alkaline electrolyte, exceeding most of the reported transition metal carbon-based electrocatalysts and being comparable to commercial Pt/C electrocatalysts. Likewise, the mf-pClNC electrocatalyst also shows state-of-the-art ORR activity and stability in acidic electrolyte. From experimental and theoretical calculations, the better ORR activity is most likely originated from the fact that the introduced Cl promotes the increase of sp 3 -hybridized carbon, while the sp 3 -hybridized carbon and Cl together modify the electronic structure of the N-adjacent carbons, as the active sites, while NaCl molten-salt etching provides abundant paths for the transport of electrons/protons. Furthermore, the liquid rechargeable ZAB using the mf-pClNC electrocatalyst as the cathode shows a fulfilling performance with a peak power density of 276.88 mW cm -2 . Flexible quasi-solid-state rechargeable ZAB constructed with the mf-pClNC electrocatalyst as the cathode exhibits an exciting performance both at low, high and room temperatures.
(© 2023 Wiley-VCH GmbH.)
Databáze: MEDLINE
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