Journal
CARBON
Volume 179, Issue -, Pages 365-376Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.04.039
Keywords
Tri-doping; pH-universal performance; Metal-free carbon-based catalyst; Oxygen reduction reaction; Green energy devices
Funding
- National Key Research and Development Program of China [2017YFA0206500]
- Fundamental Research Funds for the Central Universities [buctrc202118]
- Key Program of National Natural Science Foundation of China [51732002]
- Distinguished Scientist Program at BUCT [buctylkxj02]
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The N,P,S tri-doped holey carbon nanomaterial (NPS-HC) shows outstanding ORR performance in universal pH mediums, comparable to commercial Pt/C, and is also utilized in Zn-air batteries with peak power density, demonstrating great potential for high-performance pH-universal ORR catalysis in various energy-related technologies.
Although, metal-free electrocatalysts have been exhibiting attractive oxygen reduction reaction (ORR) performance comparable to Pt/C in alkaline electrolytes, their activity in acidic and neutral mediums is unsatisfactory, hindering their widespread application in energy devices, such as proton exchange membrane fuel cells (PEMFCs), neutral metal-air batteries, and biofuel cells. Herein, N,P,S tri-doped holey carbon (NPS-HC) nanomaterials have been prepared using a one-step method with large specific surface area (1656.0 m(2) g(-1)), abundant holes and edges, and high heteroatom content (7.57 at.%). The optimized NPS-HC exhibits outstanding ORR performance in universal pH mediums, being closely comparable to the commercial Pt/C. The NPS-HC is also utilized as air cathode in alkaline (peak power density: 286.6 mW cm(-2) @ 488.1 mA cm(-2)) and neutral (85.7 mW cm(-2) @ 228.8 mA cm(-2)) electrolytic Zn-air batteries as well as the ORR cathode in a practical PEMFC (275.1 mW cm(-2)) with comparable or superior performances than the previous reports. Such excellent electrocatalytic performance is attributed to the N,P,S tri-doping induced synergistic charge transfer and spin redistribution along with the hierarchical holey structure with exposed active sites and facilitated mass transport. Thus, this earth-abundant carbon-based nanomaterial holds great potential for high-performance pH-universal ORR catalysis in various energy-related technologies. (C) 2021 Elsevier Ltd. All rights reserved.
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