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Tytuł pozycji:

Accelerated anode and cathode reaction due to direct electron uptake and consumption by manganese dioxide and titanium dioxide composite cathode in degradation of iron composite.

Tytuł:
Accelerated anode and cathode reaction due to direct electron uptake and consumption by manganese dioxide and titanium dioxide composite cathode in degradation of iron composite.
Autorzy:
Shuai C; Institute of Additive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, China; State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China.
Zhong S; Institute of Additive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, China.
Shuai Y; College of Life Science and Technology, Huazhong University of Science and Technology, 430074, China.
Yang W; Institute of Additive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, China.
Peng S; The Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese Ministry of Education, Xiangya Hospital, Central South University, 410078, China; NHC Key Laboratory of Carcinogenesis of Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine, Cancer Research Institute, School of Basic Medical Science, Central South University, 410013, China; School of Energy and Machinery Engineering, Jiangxi University of Science and Technology, Nanchang 330013, China. Electronic address: .
He C; Institute of Additive Manufacturing, Jiangxi University of Science and Technology, Nanchang 330013, China. Electronic address: .
Źródło:
Journal of colloid and interface science [J Colloid Interface Sci] 2023 Feb 15; Vol. 632 (Pt A), pp. 95-107. Date of Electronic Publication: 2022 Nov 15.
Typ publikacji:
Journal Article
Język:
English
Imprint Name(s):
Publication: Orlando, FL : Academic Press
Original Publication: New York.
MeSH Terms:
Manganese Compounds*
Oxides*
Electrons ; Iron ; Electrodes ; Oxygen
Contributed Indexing:
Keywords: Electron consumption; Electron uptake; ORR activity; Work function
Substance Nomenclature:
TF219GU161 (manganese dioxide)
0 (Manganese Compounds)
15FIX9V2JP (titanium dioxide)
0 (Oxides)
E1UOL152H7 (Iron)
S88TT14065 (Oxygen)
Entry Date(s):
Date Created: 20221121 Date Completed: 20221206 Latest Revision: 20221206
Update Code:
20240104
DOI:
10.1016/j.jcis.2022.11.055
PMID:
36410298
Czasopismo naukowe
The movement towards the clinical application of iron (Fe) has been hindered by the slow degradation rate in physiological environments. Herein, manganese dioxide (MnO 2 ) particles were compounded with titanium dioxide (TiO 2 ) particles by mechanical ball milling, and then the mixed powders were incorporated into Fe and fabricated into an implant using selective laser melting. On the one hand, MnO 2 had a higher work function (5.21 eV) than Fe (4.48 eV), which inclined electrons to transfer from Fe to MnO 2 to accelerate the anode reaction. On the other hand, MnO 2 catalysed the oxygen reduction reaction (ORR) through a four-step proton-electron-coupled reaction, which caused more oxygen to flow into the sample to improve the cathode performance. Besides, anatase TiO 2 with high conductivity was compounded with MnO 2 to construct a composite cathode, which facilitated electron transport from the cathode to the electrolyte, further consuming electrons and promoting cathode reaction. Results showed that Fe-MnO 2 -TiO 2 had a high limiting current density of 5.32 mA·cm -2 and a large half-wave potential of -767.4 mV, indicating an enhanced ORR activity. More significantly, Fe-MnO 2 -TiO 2 had a higher average electron transfer number (2.9) than Fe-MnO 2 (2.5), demonstrating a faster electronic consumption reaction and higher cathode performance. In addition, the Fe-MnO 2 -TiO 2 also exhibited fast instantaneous and long-term degradation rates (0.33 ± 0.03 and 0.19 ± 0.02 mm/year), suggesting a high anode dissolution rate. In conclusion, introducing the cathode with high work function and ORR activity provides novel pathways for accelerating the degradation rate of Fe-based implants.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier Inc. All rights reserved.)

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