Influence of Zn doping on the electrochemical capacitor behavior of MnO₂ nanocrystals

Abstract

Herein, we suggest a simple chemical precipitation method for the preparation of bare and different levels of Zn doped MnO2 nanoparticles as electrodes for supercapacitors.

MnO2-based nanostructures for high-performance supercapacitors

“…In this case, incorporation of other metal elements (Cu, Ni, Co, Fe, Al, Zn, Mo and Sn) into MnO 2 could be an effective way to enhance its electrical conductivity and charge-storage capability. 77,[118][119][120][121] The electrochemical properties aer doping indicate that the manipulation of defect chemistry by the chemical modication has a signicant inuence on the electrical conductivity and, in turn, on the specic capacitance and rate capability. In addition to doping, the utilization of carbon black as the conductive agent in the MnO 2 electrode and the design of a free-standing MnO 2 -based nanocomposite 122,123 using conducting polymers or conductive carbon as supporting substrates can be promising solutions to improve the conductivity of MnO 2 electrodes.…”

Oxygen Defects in Promoting the Electrochemical Performance of Metal Oxides for Supercapacitors: Recent Advances and Challenges

“…In recent years, atomic doping with some specific lower valence state impurity was also demonstrated to be capable of introducing oxygen vacancies into MOs. A series of oxygen‐defective MOs, including Na + , [ 107,108 ] Zn 2+ , [ 144,145 ] Al 3+ , [ 146,147 ] Fe 3+[ 118,120,145,148 ] doped MnO 2 ; Ni 2+ doped CeO 2 ; [ 149 ] Pd 2+ doped Co 3 O 4 , [ 150 ] and so on, have been reported.…”

Influence of La3+induced defects on MnO2–carbon nanotube hybrid electrodes for supercapacitors

“…In order to overcome these demerits, some researchers have induced artificial defectsinto the MnO 2 latticeby introducing dopants(like Ag, V, B, Fe, Cu and Zn) [8][9][10][11][12][13]to improve the electrical conductivity of MnO 2 but the problem of poor cyclic stability still remained.Due to their good electrical conductivity, mechanical and chemical stability, and large specific surface area, CNTs have found widespread applications [14][15][16] including in supercapacitors assomeresearchers combined MnO 2 with multiwalled CNTs (MWCNTs) in order to improve both electrical conductivity and cycle stability of MnO 2 [17][18][19][20][21][22][23].These reports showed some improvements in the electrode performance as a result of doping of cations into MnO 2 as well as for coupling with CNTs but the value of specific capacitance still did not cross beyond a few hundred F/g. Interestingly, although MnO 2 based electrode that is both doped with cationsand coupled with CNTsis likely to have high performance due to synergistic influence on the electrical conductivity and cyclic stability, it has not been explored till date.…”