Hierarchical manganese valence gradient MnO2via phosphorus doping for cathode materials with improved stability. Issue 5 (16th January 2023)

• Record Type: Journal Article
• Authors: Zhao, Limin; Ni, Zejuan; Ge, Bo; Jin, Chuanyu; Zhao, Hui; Li, Wenzhi
• Is Part Of: Physical chemistry chemical physics. Volume 25:Issue 5(2023)
• Page Start: 3766
• Page End: 3771
• Publication Date: 2023-01-16
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/d2cp04210j
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : The oxygen defects concentration in P-MnO x increased and formed a gradient valence structure, which could result in the narrowing of band gap and improve the electrochemical performance of samples for supercapacitor and aqueous ZIBs. Abstract : The search for a method for enhancing the electrochemical performance of manganese dioxide is still a challenge. Herein, we report a rod-like P-MnO x cathode material with a hierarchical manganese gradient valence through the phosphatization process. For the incorporation of P, Mn3 O4 was formed on the surface of MnO2 and exhibited a gradient valence structure, while the oxygen defect concentration in P-MnO x increased. The unique structure was verified via XRD, TEM and XPS. As the cathode material for a supercapacitor, the specific capacitance of P-MnO x was 126.3 F g −1, which was four times that of MnO2 . The assembling of the coin cells of aqueous ZIBs with P-MnO x also showed good rate performance. The electrochemical performance of the synthesised P-MnO x cathode was enhanced for the synergistic effect of improved conductivity and structural stability.