Monometallic and bimetallic metal-organic frameworks derived CoP embedded in porous carbon: Monodisperse CoP nanoparticles for highly reversible potassium ion storage

Authors
Choi, Hun SeokKim, Young HwanBak, Seong-MinKim, Kwang-Bum
Issue Date
2024-01
Publisher
Elsevier BV
Citation
Applied Surface Science, v.643
Abstract
Metal phosphides show promise as anode materials for high-energy potassium-ion batteries due to their high capacity. However, their cycling performance is hampered by volume changes. Although nanoparticle/carbon composites are commonly employed to tackle this issue, achieving uniform embedding within confined carbon structures still presents a challenge. In this study, we investigate the synthesis strategies of CoP/porous carbon composites using isostructural bimetallic and monometallic-zeolitic imidazolate framework (ZIF), and achieve uniform embedding of-4 nm CoP nanoparticles in porous carbon by utilizing a bimetallic Co/Zn ZIF. Conversely, monometallic ZIF-67 leads to substantial coarsening and non-uniform distribution of-25 nm CoP particles. The resulting bimetallic-ZIF-derived CoP/porous carbon composite exhibits a specific capacity of 490.5 mAh/g at 0.05 A/g for potassium-ion storage and remarkable cycling stability, retaining 100 % capacity over 500 cycles at 0.1 A/g. Differential capacity plots confirm improved reversibility of the CoP conversion reaction. Notably, the evaporation of Zn generates a pore structure that effectively confines CoP, preventing further ag-gregation during electrochemical cycling. This work showcases a unique synthesis strategy using a bimetallic ZIF for high-performance potassium-ion battery materials.
Keywords
ULTRALONG CYCLE LIFE; FACILE SYNTHESIS; RATIONAL DESIGN; ANODE MATERIALS; LITHIUM; PERFORMANCE; GRAPHENE; MOF; COMPOSITES; ELECTRODES; Nanoparticle aggregation; Cobalt phosphide; Potassium -ion battery; Metal-organic framework (MOF); Bimetallic metal-organic framework; MOF-derivatives
ISSN
0169-4332
URI
https://pubs.kist.re.kr/handle/201004/112977
DOI
10.1016/j.apsusc.2023.158679
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KIST Article > 2024
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