New insight on the mechanism of electrochemical cycling effects in MnO2-based aqueous supercapacitor

Sun, Zhenheng; Zhang, Yaxiong; Liu, Yupeng; Fu, Jiecai; Cheng, Situo; Peng, Chi; Xie, Erqing

doi:10.1016/j.jpowsour.2019.226795

Cited by 50 publications

(35 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 71,79 ] The enhanced redox‐type pseudocapacitance by preintercalation is mainly attributed to the increase of BET surface area and controlling morphologies of MnO 2 , which result in higher density of active sites on surface of the poorly crystallized MnO 2 . [ 57,80 ] For example, Chen et al. [ 57 ] reported that Ce 3+ intercalated α‐MnO 2 presented much higher BET surface area, which provided more surface active sites to increase redox‐type pseudocapacitance; Radhiyah et al.…”

Section: Activating More Active Sites For Charge Storagementioning

confidence: 99%

Preintercalation Strategy in Manganese Oxides for Electrochemical Energy Storage: Review and Prospects

et al. 2020

View full text Add to dashboard Cite

the past decades, some issues of MnO 2based cathodes still remain due to the low electronic conductivity, [19-21] low utilization of reversible discharge depth, [22,23] sluggish diffusion kinetics, [24-26] and poor structural stability upon cycling, [27-29] which restricts their practical application in the commercial secondary batteries. Taking the Zn-ion batteries as example, the MnO 2 cathode seriously suffer from the above issues, especially the sluggish Zn 2+ diffusion, [30] and structural collapse issue during H + /Zn 2+ intercalation/ extraction cycles. [31-33] Regarding these bottlenecks, researchers have strived to develop strategies that can realize optimizations in capacity, rate, and cycling properties of MnO 2 cathodes, such as surface coating, [34] metal-doping, [35] preintercalation, [36] etc. Among all the strategies, preintercalation strategy provides a basic and effective method for optimizing the structure and electrochemical performance of MnO 2-based cathodes. In recent years, the preintercalation strategy has attracted much attention as an effective approach to enhance the electrochemical performance of cathode materials, including vanadate, [37] manganese oxides, [23] layered LiCoO 2 , [38] etc. Several reviews and prospects have been conducted for MnO 2 materials. Some reviews have mentioned the electrochemical properties and correlated reaction mechanism of MnO 2 materials in aqueous Zn batteries, [29,39,40] and a review by Mai's group offers insights into the rational design of preintercalation electrodes in next-generation rechargeable batteries. [36] However, a review or prospect on the application and mechanism of the preintercalation strategy in MnO 2 materials for nextgeneration batteries is lacking. For MnO 2 electrode materials, many reports on improving the electrochemical properties of materials by applying preintercalation strategy have been emerged in the last 5 years (Table S1 in the Supporting Information). The main feature of the preintercalated MnO 2 materials is that some ions/molecules are preintercalated into the tunnel or interlayer hosts of MnO 2 materials prior to the battery cycling (or during synthesis process). These intercalated guest species, including ions, inorganic/organic molecules, as well as polymers, present electrostatic and physical interactions with the host framework and the inserted carrier ions via chemical bonding or coordination, presenting significant benefiting effect on the inherent structure of hosts and the transport kinetics of carrier ions. Generally, there are several Manganese oxides (MnO 2) are promising cathode materials for various kinds of battery applications, including Li-ion, Na-ion, Mg-ion, and Zn-ion batteries, etc., due to their low-cost and high-capacity. However, the practical application of MnO 2 cathodes has been restricted by some critical issues including low electronic conductivity, low utilization of discharge depth, sluggish diffusion kinetics, and structural instability upon cycling. Preintercalation of ions/molecules ...

show abstract

Section: Activating More Active Sites For Charge Storagementioning

confidence: 99%

Preintercalation Strategy in Manganese Oxides for Electrochemical Energy Storage: Review and Prospects

et al. 2020

View full text Add to dashboard Cite

show abstract

“…[23][24][25][26] Nevertheless, in our previous research, the electrochemical cycling studies of MnO 2 electrode in the Na 2 SO 4 electrolyte reveal the obvious cycling effect with significant morphological and electronic changes of MnO 2 . [27] It is deduced that multivalent ions based electrolyte will induce more server changes on the electrode materials due to the higher charge number and more vigorous polarization intensity of multivalent ions, which is reported in the other works. [28,29] Therefore, it is essential to figure out the charge storage mechanism of MnO 2 electrode materials with multivalent ions to enhance the electrochemical performance of MnO 2 -based hybrid supercapacitors.…”

Section: Introductionmentioning

confidence: 74%

“…According to the previous reports of the electrochemical properties of MnO 2 , two noticeable effects of MnO 2 electrode materials dissolution and structure reconstruction usually occur at the initial cycling operations, which causes the electrochemical performance fluctuation of MnO 2 -based electrode and significantly hinders the intrinsic mechanism of the charge storage of MnO 2 during the electrochemical cycling process. [27,30] Thus, the long-term electrochemical behaviors of the MnO 2 were investigated purposefully. In the experiment, long-term electrochemical cycling of 5000-cycles of galvanostatic chargingdischarging (GCD) process was carried out on the prepared MnO 2 @CNTs-based electrode at the different potential window with the same current density of 4 mA cm −2 , and their corresponding electrochemical performance and morphological evolution were linked and studied systemically, as shown in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

“…It can be seen that at the beginning of the cycle, the samples undergo a distinct electrochemical activation process, which is reported in our previous works. [27,30] This process corresponds to the structural transition of MnO 2 from particles to nanosheets. Such a process increases the active sites and accompanies with ion embedding, resulting in a jump in performance at the beginning of the cycle.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

New Insight into the Mechanism of Multivalent Ion Hybrid Supercapacitor: From the Effect of Potential Window Viewpoint

Liu

Zhang

Sun

et al. 2020

Small

Self Cite

View full text Add to dashboard Cite

Multivalent ion hybrid supercapacitors have been developed as the novel electrochemical energy storage systems due to their combined merits of high energy density and high power density. Nevertheless, there are still some challenges due to the limited understanding of the electrochemical behaviors of multivalent ions in the electrode materials, which greatly hinders the large scale applications of its based hybrid supercapacitors. Herein, the long‐term electrochemical behaviors of MnO2‐based electrode in the divalent Mg2+ ions electrolyte are systematically studied and linked with the morphological and electronic evolution of MnO2 by cycling at different potential windows (spanning to 1.2 V). It reveals that the different potential windows result in the different electrochemical behaviors, which can be divided into two ranges (below and above −0.2 V). And, the electrode cycled at a potential window of 0–1.2 V delivers the highest capacitance of 967 F g−1 at a scan rate of 10 mV s−1, in which the MnO2 is transformed into a uniformly distributed and nonagglomerated nanoflake morphology promoting the intercalation and deintercalation of Mg2+ ions. This study will enrich the understanding of the charge storage mechanism of multivalent ions and provide significant guidance on the performance improvement of the hybrid supercapacitors.

show abstract

“…As the concentration of the deposition precursor increases, there is no significant difference in the microscopic morphology of the material surface, but the mass of the active material deposited on the substrate increases, and the mass specific capacity decreases (the electrochemical performance chart behind is easy to see). We conclude that the change in the solubility of the electrodeposition solution in a small range will only cause a change in the deposition quality (film thickness), and while the electrochemical reaction mainly occurs on the surface of the film, lowering the effective utilization of thicker films, the specific capacitance also decreases [23]. However, at lower precursor concentrations, the loading mass of the manganese dioxide film is very low, and the overall capacitance performance is reduced.…”

Section: Surface Topography and Microstructure Analysismentioning

confidence: 87%

High Specific Capacitance of the Electrodeposited MnO2 on Porous Foam Nickel Soaked in Alcohol and its Dependence on Precursor Concentration

et al. 2020

View full text Add to dashboard Cite

In this work, we used the mixed solution of manganese acetate and sodium sulfate to deposit manganese dioxide on the three-dimensional porous nickel foam that was previously soaked in alcohol, and then the effects of solution concentrations on their capacitance properties were investigated. The surface morphology, microstructure, elemental valence and other information of the material were observed by scanning electron microscope (SEM), Transmission Electron Microscope (TEM), X-ray photoelectron spectroscopy (XPS), etc. The electrochemical properties of the material were tested by Galvanostatic charge-discharge (GCD), Cyclic Voltammetry (CV), Chronoamperometry (CA), Electrochemical impedance spectroscopy (EIS), etc. The MnO2 electrode prepared at lower concentrations can respectively reach a specific capacitance of 529.5 F g−1 and 237.3 F g−1 at the current density of 1 A g−1 and 10 A g−1, and after 2000 cycles, the capacity retention rate was still 79.8% of the initial capacitance, and the energy density can even reach 59.4 Wh Kg−1, while at the same time, it also has a lower electrochemical impedance (Rs = 1.18 Ω, Rct = 0.84 Ω).

show abstract

New insight on the mechanism of electrochemical cycling effects in MnO2-based aqueous supercapacitor

Cited by 50 publications

References 43 publications

Preintercalation Strategy in Manganese Oxides for Electrochemical Energy Storage: Review and Prospects

Preintercalation Strategy in Manganese Oxides for Electrochemical Energy Storage: Review and Prospects

New Insight into the Mechanism of Multivalent Ion Hybrid Supercapacitor: From the Effect of Potential Window Viewpoint

High Specific Capacitance of the Electrodeposited MnO2 on Porous Foam Nickel Soaked in Alcohol and its Dependence on Precursor Concentration

Contact Info

Product

Resources

About