Surface Corrosion Engineering Endows Mn-Doped NiCo₂O₄ Nanosheets with High Capacity and Long Life for Alkaline Zn-Based Batteries

Abstract

NiCo 2 O 4 for alkaline Zn-based batteries (AZBs) suffers from low capacity and an unsatisfactory cycling life. Meanwhile, the widespread application of NiCo 2 O 4 is seriously limited by costly and tedious synthetic procedures. In this work, a facile and economically efficient surface corrosion strategy is demonstrated to fabricate a high-performance Mn-doped NiCo 2 O 4 (SMNC) nanosheet cathode for AZBs. Compares to the undoped NiCo 2 O 4 (SNC), the SMNC shows enhanced mass transfer ability and increased active sites. Consequently, the Zn/SMNC cell reaches a big areal capacity of 0.58 mA h cm −2 at 2 mA cm −2 as well as an ultralong cycle life with 95% capacity retention over 6000 cycles. This work provides an effective, low-cost, and method to prepare advanced cathode materials for AZBs.

Ultrasonic-Assisted Electrodeposition of Mn-Doped NiCo2O4 for Enhanced Photodegradation of Methyl Red, Hydrogen Production, and Supercapacitor Applications

“…On the contrary, the XPS strength of O 1s increased due to the rise in oxygen vacancies present in F(s). These findings are consistent with the trends observed in the XRD analysis [38].…”

“…Figure 5 shows the XPS spectra of F(u) and F(s) obtained with and without ultrasonicassisted electrodeposition to confirm oxygen deficiencies and the replacement of Ni by Mn. An increase in the peak area for O 1s (531.63 eV) was observed for F(s), indicating that the ultrasonic-assisted synthesis successfully introduced abundant oxygen vacancies [38]. Figure 6 shows the XPS spectra of A(u) and F(u), both before and after Mn doping for Mn 2p, Co 2p, Ni 2p, and O 1s.…”