1. Dual-MOFs-Derived Fe and Mn Species Anchored on Bamboo-like Carbon Nanotubes for Efficient Oxygen Reduction as Electrocatalysts.
- Author
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Situ, Ailan, Zhao, Tianyou, Huang, Yuetong, Li, Pingzhen, Yang, Lingui, Zhang, Zehong, Wang, Zhaochen, Ou, Yongsheng, Guan, Xiongcong, Wen, Jinxiu, Zhang, Jiong, Zhan, Yunfeng, and Tang, Xiufeng
- Subjects
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OXYGEN reduction , *CARBON nanotubes , *ALKALINE batteries , *ELECTROCATALYSTS , *BIMETALLIC catalysts , *CLEAN energy , *METAL-air batteries - Abstract
The development of efficient non-precious metal electrocatalysts for oxygen reduction reaction (ORR) to replace Pt-based methods is crucial for the applications of fuel cells and metal–air batteries. In this study, a bimetallic M-N-C catalyst with highly dispersed dual-atom Fe/Mn-Nx sites immobilized on N-doped bamboo-like carbon nanotubes is prepared by the ball-milling and calcination of dual-MOFs as precursors. The rich N-doping and abundant M–Nx species contribute to the excellent intrinsic ORR activity of the catalyst, and the unique bamboo-like nanotubes morphology is beneficial for facilitating electron transfer and mass transport while simultaneously enabling the exposure of active sites. As expected, the optimized Z-Fe1Mn1-NC catalyst exhibits efficient ORR activity with a half-wave potential (E1/2) of 0.80 V in acid and 0.82 V in alkaline, and a higher electrochemical stability with the current density maintained at 91% (in 0.1 M KOH) and 86% (0.1 M HClO4) of its initial current density after 15 h of a chronoamperometric test at a high potential of 0.7 V. When further applied to Zn–air batteries, the catalyst also delivers a high open-circuit voltage, large power density, and outstanding rate performance. This work provides a novel means of designing dual metal M–Nx site-based M-N-C catalysts for ORR sustainable energy applications. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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