Journal
APPLIED SURFACE SCIENCE
Volume 507, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.145154
Keywords
N; B; F-tridoping; 3D carbon network; Oxygen reduction reaction; Zinc-air battery
Categories
Funding
- National Natural Sciecne Foundation of China [51774251]
- Hebei Science Foundation for Distinguished Young Scholars [B2017203313]
- Hundreds of Innovative Talents in Hebei Province [SLRC2017057]
- state key laboratory of Advanced Chemical Power Sources [SKL-ACPS-C-11]
- Talent Engineering Training Funds of Hebei Province [A201802001]
- Shanghai Pujiang Program [17PJD016]
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Nanoarchitecture design and electronic structure engineering are critically important for efficient electrocatalysis. Designing a multi-heteroatoms doped carbon with three dimensional nanoarchitectures can efficiently modulate the electronic structure, create more defective sites and offer a 3D electric conductive circuit, which however has been encountering difficulties in preparation. This work demonstrates the construction of a N,B,F-tridoped 3D carbon network through a novel NH4BF4 triggered self-assembly of chitosan chain. Such a unique structure presents abundant surface active edge defects and in-plane nanopore defects. Density functional theory calculations reveal the significant coupling effect of N,B,F-tridoping down to the atomic scale, whereby the strong electronegativity of F (chi = 4.0) can positively charge the carbon matrix and contribute more adjacent carbon active sites. This endows the catalyst with impressive Pt like oxygen reduction reaction (ORR) catalytic performance, with a high onset potential of 0.95 V, half-wave potential of 0.818 V (vs RHE), and limiting current density of 6.0 mA cm(-2). The as constructed zinc-air battery demonstrates a maximum power density of 175 mW cm(-2), along with almost unchanged voltage after 25 h galvanostatic discharge.
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