Journal of Energy Chemistry ›› 2022, Vol. 66 ›› Issue (3): 339-347.DOI: 10.1016/j.jechem.2021.05.045

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Cu3P nanoparticles confined in nitrogen/phosphorus dual-doped porous carbon nanosheets for efficient potassium storage

Yuanxing Yuna, Baojuan Xia,*, Yu Gua, Fang Tiana, Weihua Chenb, Jinkui Fengc, Yitai Qiana, Shenglin Xionga,*   

  1. aKey Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, Shandong, China;
    bKey Laboratory of Material Processing and Mold of Ministry of Education, Zhengzhou University, Zhengzhou 450001, Henan, China;
    cKey Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2021-04-29 Revised:2021-05-25 Accepted:2021-05-26 Published:2022-10-25
  • Contact: * Correspondence author.E-mail addresses: baojuanxi@sdu.edu.cn (B. Xi), chexsl@sdu.edu.cn (S. Xiong).

Abstract: Immobilizing primary electroactive nanomaterials in porous carbon matrix is an effective approach for boosting the electrochemical performance of potassium-ion batteries (PIBs) because of the synergy among functional components. Herein, an integrated hybrid architecture composed of ultrathin Cu3P nanoparticles (~20 nm) confined in porous carbon nanosheets (Cu3P⊂NPCSs) as a new anode material for PIBs is synthesized through a rational self-designed self-templating strategy. Benefiting from the unique structural advantages including more active heterointerfacial sites, intimate and stable electrical contact, effectively relieved volume change, and rapid K+ ion migration, the Cu3P⊂NPCSs indicate excellent potassium-storage performance involving high reversible capacity, exceptional rate capability, and cycling stability. Moreover, the strong adsorption of K+ ions and fast potassium-ion reaction kinetics in Cu3P⊂NPCSs is verified by the theoretical calculation investigation. Noted, the intercalation mechanism of Cu3P to store potassium ions is, for the first time, clearly confirmed during the electrochemical process by a series of advanced characterization techniques.

Key words: Cu3P, Potassium-ion batteries, Nitrogen/phosphorus dual-doped porous carbon sheets, Intercalation mechanism, Heterointerface