Facile synthesis of manganese carbonate quantum dots/Ni(HCO₃)₂–MnCO₃ composites as advanced cathode materials for high energy density asymmetric supercapacitors

Abstract

Well dispersed MnCO3 quantum dots (∼1.2 nm) decorated on Ni(HCO3)2–MnCO3 as a cathode electrode for high performance supercapacitors.

Rational design of microsphere and microcube MnCO 3 @MnO 2 heterostructures for supercapacitor electrodes

“…In the carbon 1s spectrum, the two binding energy peaks at 284.4 and 285.9 eV correspond to the characteristic bands of C-C and C-O bonds, respectively. Another binding energy peak of 289.1 eV is attributed to MnCO 3 [18]. The Mn 2p spectrum displays two peaks at binding energy of 654.2 and 642.4 eV with a spinenergy separation of 11.8 eV, which is in good agreement with the Mn 2p 1/2 and Mn 2p 3/2 in MnO 2 , respectively [26].…”

“…Accordingly, Devaraj et al [17] disclosed submicron sized MnCO 3 as electrode materials for supercapacitors with good reversibility and superior rate performance. Xia et al [18] prepared MnCO 3 QDs/Ni(HCO 3 ) 2 -MnCO 3 shell-needle composites by one-step hydrothermal method, which exhibited outstanding electrochemical properties. The above results revealed that manganese carbonate is a respectable electrode material for supercapacitors.…”

Fabrication of FeO@CuCo 2 S 4 multifunctional electrode for ultrahigh‐capacity supercapacitors and efficient oxygen evolution reaction

“…where C e (0.04 mF cm −2 ) is the specific capacitance of the alkaline KOH solution . The FeO@CuCo 2 S 4 electrode shows a comparatively higher ECSA value of 521 cm 2 compared to the FeO (91 cm 2 ), CoS 2 (141 cm 2 ), CuS (271 cm 2 ), and CuCo 2 S 4 (396 cm 2 ) electrodes.…”

Single‐Phase Mixed Transition Metal Carbonate Encapsulated by Graphene: Facile Synthesis and Improved Lithium Storage Properties

“…Taken both the compositional and structural design into consideration, MTMCs would hold greater promise to exhibit superior lithium storage properties if they can be fabricated with highly porous micro‐/nanostructures and hybridized with flexible graphene into well‐organized architectures. However, the MTMC/graphene composites have rarely been reported so far, mainly due to the tendency of phase segregation for MTMCs during the fabrication process . Therefore, it is of both practical and academic interest to develop a facile and scalable strategy for the synthesis of MTMC/graphene composites with tunable compositions, and to understand the synergistic effects between different metal cations in MTMCs.…”