Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 3, Pages 2072-2079Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b02129
Keywords
inductive effect; Mn doped-NiO; nanosheet arrays; electron transport; high stability; hybrid supercapacitor
Funding
- National Key Research and Development Program of China [2017YFA0206500]
- National Natural Science Foundation of China (NSFC)
- Beijing Natural Science Foundation [2172042]
- PetroChina Innovation Foundation
- Fundamental Research Funds for the Central Universities
- High Performance Computing Platform of Beijing University of Chemical Technology
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The inductive effect related to foreign metal substitution has great effect on the redox behavior of transition metal oxides, which plays an important role in their electrochemical activities. In this work, we demonstrate the inductive effect in nickel oxide nanosheet arrays (NSAs) via doping with the lower electronegative element Mn, which has greatly improved their electrochemical capacitance and stability. Density functional theory (DFT) calculations show that the inductive effect in Mn-NiO increases the electron transport efficiency, enhances the adsorption energy of OH-, and also makes the compound more covalent. Therefore, Mn-NiO NSAs demonstrated a dramatically improved specific capacitance twofold better than that of pure NiO NSAs at a current density of 5 mA cm(-2) and higher stability without any decay of capacitance after 10 000 cycles at 30 mA cm(-2). Moreover, the hybrid supercapacitor device of Mn-NiO NSAs//graphene-CNT exhibited an excellent recycling stability after 50 000 cycles of charging/discharging at 6 A g(-1) with comparative energy density and power density.
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