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Phosphorus Particles Embedded in Reduced Graphene Oxide Matrix to Enhance Capacity and Rate Capability for Capacitive Potassium‐Ion Storage
Author(s) -
Wang Hong,
Wang Lifeng,
Wang Liancheng,
Xing Zheng,
Wu Xuan,
Zhao Wei,
Qi Xiujun,
Ju Zhicheng,
Zhuang Quanchao
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201802753
Subject(s) - graphene , materials science , electrode , composite number , oxide , chemical engineering , electrochemistry , battery (electricity) , nanoparticle , potassium , capacitive sensing , nanotechnology , composite material , metallurgy , electrical engineering , chemistry , power (physics) , physics , quantum mechanics , engineering
Early studies indicate that graphite is feasible as the negative electrode of a potassium‐ion battery, but its electrochemical performance still cannot meet the demands of applications. More efforts should be focused on increasing the specific capacity and improving the rate capability in the meantime. Thus, stainless‐steel autoclave technology has been utilized to prepare phosphorus nanoparticles encapsulated in reduced graphene oxide matrix as the electrode materials for a potassium‐ion battery. As a result, the composite matrix affords high reversible capacities of 354 and 253 mA h g −1 at 100 and 500 mA g −1 , respectively. The superior electrochemical performance is mainly because the composite matrix possesses better electronic conductivity and a robust structure, which can promote the electron‐transfer performance of the electrode. Furthermore, phosphorus particles can contribute to the high capacity through an alloying mechanism. In addition, the silklike, ultrathin, film composite with a high surface area is conducive to capacitive potassium‐ion storage, which plays a more important role in rate performance and a high current density capability.