Rich bulk oxygen Vacancies-Engineered MnO2 with enhanced charge transfer kinetics for supercapacitor

Zhang, Anqi; Gao, Rui; Hu, Lingyuan; Zang, Xiaogang; Yang, Renqiang; Wang, Shiyu; Yao, Shuyun; Yang, Zhiyu; Hao, Haigang; Yan, Yi‐Ming

doi:10.1016/j.cej.2021.129186

Cited by 120 publications

(68 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The spin energy separation between these two peaks is 11.7 eV. These results are in accordance with the previous reports [19,49,51] [6,[52][53][54]. Figure 12(a-d) compares the morphologies of the pristine substrate and the electrodeposited MnO 2 formed at different times.…”

Section: Vgcnf-ink/paper As a Substrate For The Electrodeposition Of Metal Oxidessupporting

confidence: 91%

Chinese ink-facilitated fabrication of paper-based composites as electrodes for supercapacitors

Yan

Xiao

et al. 2021

International Journal of Smart and Nano Materials

View full text Add to dashboard Cite

Commercial Chinese ink was employed to disperse pristine vapor-grown carbon nanofibers (VGCNFs) in aqueous suspensions via horizontal ball milling. The obtained suspension was used to fabricate conductive paper-based composites through filtration-deposition onto filter paper. It was found that the carbon black particles from the Chinese ink helped separate VGCNFs and acted as connection points between the VGCNFs, while the glue reinforced the conduction network. Thus, the VGCNF-ink/paper ternary composite showed sufficiently low sheet resistance. With merely 2.5 mg•cm −2 VGCNFs, the sheet resistance could be reduced to 4.5 Ω•sq −1 . As a proof of concept, these paper-based composites were directly used as electrodes of solid-state symmetric electronic double-layer capacitors (EDLCs) and the substrate for the electrodeposition of MnO 2 to achieve higher electrochemical performances. The EDLCs fabricated with 2.5 mg•cm −2 VGCNFs showed a specific capacitance of 224 mF•cm −2 at a current density of 1 mA•cm −2 , which was retained by 86.4% after 10,000 charge-discharge cycles. Moreover, thanks to the high electrical conductivity and the porous structure, the MnO 2 decorated paper-based composites exhibited dramatically enhanced specific capacitance. It is believed that our finding offers an idea to directly utilize commercial Chinese ink for the fabrication of electrode materials.

show abstract

Section: Vgcnf-ink/paper As a Substrate For The Electrodeposition Of Metal Oxidessupporting

confidence: 91%

Chinese ink-facilitated fabrication of paper-based composites as electrodes for supercapacitors

Yan

Xiao

et al. 2021

International Journal of Smart and Nano Materials

View full text Add to dashboard Cite

show abstract

“…demonstrated that the presence of oxygen vacancies can accelerate transfer kinetics and enhance the adsorption energy of electrolyte ions, resulting in high specific capacitance and superior rate performance. [ 14 ] Kang et al. demonstrated that the introduction of S‐vacancies can enhance the electrical conductivity, revealing excellent electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Sulfur Vacancies‐Engineered Ni₃S_4‐x Hollow Microspheres with Optimized Anionic Adsorption Energy for High‐Performance Supercapacitor

Zhang

Liang

et al. 2021

Small

View full text Add to dashboard Cite

Nickel sulfides with high theoretical capacitance have aroused tremendous attention for next‐generation supercapacitors. Unfortunately, the structural durability of nickel sulfides is insufficient to support the long‐term working situation. Herein, Ni3S4‐x hollow microspheres with sulfur vacancies (Ni3S4‐x HMs) are constructed by a liquid‐phase anion exchange process using the Ni‐MOF as the precursor. Both experimental investigation and theoretical analysis suggest that the deliberately introduced sulfur vacancies effectively improve the anionic adsorptive ability of nickel sulfides in the KOH electrolyte, significantly enhancing the reversible capacitance and structural durability (1884 F g‐1 at 2 A g‐1, capacity retention of 97.9% after 10 000 cycles). In addition, an asymmetrical solid‐state supercapacitor consisting of Ni3S4‐x HMs cathode and activated carbon anode shows infusive energy/power density (33.05 Wh kg‐1/1.68 kW kg‐1) and remains 82.4% over 10 000 repeated charging/discharging processes in the KOH‐PVA gel electrolyte. The strategies can be developed to enlighten the structural design of various metal sulfides materials adopted in electrochemical energy storage devices including alkali ion batteries, supercapacitors, and electrocatalysts.

show abstract

Section: Theoretical Investigationmentioning

confidence: 99%

“…Thus, OVs provide strong active sites to stabilize the OH electrolyte‐free anions for enhanced electrochemical energy storage. Zhang et al [ 32 ] investigated Na + storage in MnO 2 with rich OVs. The charge density difference revealed that the increase in OVs results in the accumulation of electrons around O and their depletion around Mn (Figure 4d).…”

Section: Theoretical Investigationmentioning

confidence: 99%

See 1 more Smart Citation

Oxygen‐Deficient Metal Oxides for Supercapacitive Energy Storage: From Theoretical Calculation to Structural Regulation and Utilization

Wan

Wang

et al. 2022

Adv Energy and Sustain Res

View full text Add to dashboard Cite

Supercapacitors (SCs) have attracted considerable research interest because of their complementary role to dominated lithium-ion batteries (LIBs) for powering the electrified society. [1] In contrast to the bulk-involved reactions for energy storage in LIBs, SCs mainly store charges in the electric double layers (EDLs) via electrostatic adsorption where highly porous and conductive materials, for example, activated carbons, are needed. [2] This storage mechanism allows SCs to exhibit excellent rate capability, long cyclic life, and high safety; therefore, it is indispensable in many fields. [3] However, despite these advantages, the limited charge storage space within electrode materials considerably restricts the energy density of SCs. To overcome this limitation, tremendous efforts have been devoted to the search for electrode materials that employ alternative charge-storage mechanisms that can improve energy storage. [4] Some metal oxides (MOs) can afford extremely fast surface redox reactions which compare favorably with those of electrostatic charge adsorption at the EDLs. Although these processes are faradaic in nature, they show an excellent rate capability that is similar to that of the EDL charge storage in the porous carbon electrodes of current SCs. Then, these MOs are defined as pseudocapacitive materials, and they can improve the energy density of current SCs. [5] The theoretical capacitance of the MO-based electrodes can be calculated using Equation (1) [6] Cwhere n, F, M, and V represent the number of transferred electrons, Faraday constant (C mol À1 ), the molar mass of the MOs (g mol À1 ), and operating voltage window (V), respectively. The specific capacitance of the typical MO electrode materials is summarized in Table 1.The MOs should have suitable electronic structures, desired electrical conductivity, and sufficient active sites to facilitate surface redox reactions. To this end, tremendous progress has been realized via research efforts in recent decades. [7] Heteroatomdoping has been widely used to engineer electronic structures. [8] Zeng et al. [9] synthesized a Ti-doped Fe 2 O 3 @poly

show abstract

Rich bulk oxygen Vacancies-Engineered MnO2 with enhanced charge transfer kinetics for supercapacitor

Cited by 120 publications

References 41 publications

Chinese ink-facilitated fabrication of paper-based composites as electrodes for supercapacitors

Chinese ink-facilitated fabrication of paper-based composites as electrodes for supercapacitors

Sulfur Vacancies‐Engineered Ni₃S_4‐x Hollow Microspheres with Optimized Anionic Adsorption Energy for High‐Performance Supercapacitor

Oxygen‐Deficient Metal Oxides for Supercapacitive Energy Storage: From Theoretical Calculation to Structural Regulation and Utilization

Contact Info

Product

Resources

About

Rich bulk oxygen Vacancies-Engineered MnO2 with enhanced charge transfer kinetics for supercapacitor

Cited by 120 publications

References 41 publications

Chinese ink-facilitated fabrication of paper-based composites as electrodes for supercapacitors

Chinese ink-facilitated fabrication of paper-based composites as electrodes for supercapacitors

Sulfur Vacancies‐Engineered Ni3S4‐x Hollow Microspheres with Optimized Anionic Adsorption Energy for High‐Performance Supercapacitor

Oxygen‐Deficient Metal Oxides for Supercapacitive Energy Storage: From Theoretical Calculation to Structural Regulation and Utilization

Contact Info

Product

Resources

About

Sulfur Vacancies‐Engineered Ni₃S_4‐x Hollow Microspheres with Optimized Anionic Adsorption Energy for High‐Performance Supercapacitor