nn0c03737_si_003.pdf (1.46 MB)
Multiregion Janus-Featured Cobalt Phosphide-Cobalt Composite for Highly Reversible Room-Temperature Sodium-Sulfur Batteries
journal contribution
posted on 2020-07-30, 10:04 authored by Zichao Yan, Yaru Liang, Weibo Hua, Xia-Guang Zhang, Weihong Lai, Zhe Hu, Wanlin Wang, Jian Peng, Sylvio Indris, Yunxiao Wang, Shu-Lei Chou, Huakun Liu, Shi-Xue DouElectrode
materials with high conductivity, strong chemisorption,
and catalysis toward polysulfides are recognized as key factors for
metal-sulfur batteries. Nevertheless, the construction of such functional
material is a challenge for room-temperature sodium-sulfur (RT-Na/S)
batteries. Herein, a multiregion Janus-featured CoP-Co structure obtained via sequential carbonization–oxidation–phosphidation
of heteroseed zeolitic imidazolate frameworks is introduced. The structural
virtues include a heterostructure existing in a CoP-Co structure and
a conductive network of N-doped porous carbon nanotube hollow cages
(NCNHCs), endowing it with superior conductivity in both the short-
and long-range and strong polarity toward polysulfides. Thus, the
S@CoP-Co/NCNHC cathode exhibits superior electrochemical performance
(448 mAh g–1 remained for 700 times cycling under
1 A g–1) and an optimized redox mechanism in polysulfides
conversion. Density functional theory calculations present that the
CoP-Co structure optimizes bond structure and bandwidth, whereas the
pure CoP is lower than the corresponding Fermi level, which could
essentially benefit the adsorptive capability and charge transfer
from the CoP-Co surface to Na2Sx and therefore improve its affinity to polysulfides.
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Keywords
conductive networkpolysulfides conversioncharge transferMultiregion Janus-Featured Cobalt P...adsorptive capabilitycarbon nanotubeCoP-Co structureNa 2 S xtheory calculationsconductivityFermi levelmultiregion Janus-featured CoP-Co s...optimized redox mechanismNCNHCmetal-sulfur batteriesReversible Room-Temperature Sodium-...room-temperature sodium-sulfurheteroseed zeolitic imidazolate fra...700 times cyclingCoP-Co structure optimizes bond str...CoP-Co surface
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