MnO<sub>2</sub> nanoflowers and polyaniline nanoribbons grown on hybrid graphene/Ni 3D scaffolds by in situ electrochemical techniques for high-performance asymmetric supercapacitors

Wu, Liqiong; Líu, Hao; Pang, Bowen; Wang, Guofeng; Zhang, Yin; Li, Xinheng

doi:10.1039/c6ta10757e

Cited by 55 publications

(14 citation statements)

References 57 publications

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“…The electrodes and membranes were overlapped and packaged by ultra-thin plastic film. Obviously, the maximum energy density of PANI-Mn supercapacitor is 51.38 Wh kg −1 at the power density of 850 W kg −1 , presenting a higher energy density and power density compared to analogous PANI supercapacitors, such as NPCNFs//NPCNFs (NPCNF means nitrogen-doped porous carbon nanofibers, 9.2 Wh kg −1 at 0.25 kW kg −1 ), [50] rGO/PANI (28.06 Wh kg −1 at 0.25 kW kg −1 ), [51] MnO 2 /HGNF// PANI/HGNF (HGNF means hybrid graphene/Ni 3D scaffolds, 41.0 W h kg −1 at 787.3 W kg −1 ), [52] MnO 2 @PANI// MnO 2 @PANI (37 Wh kg −1 at 386 W kg −1 ), [19] SPAN/FC// SPAN/FC (SPAN means self-doped polyaniline, 9.2 Wh kg −1 at 1000 W kg −1 ), [53] BNC/CNT/ion gel (BNC means bacterial Slight polarization is observed when the voltage range expands from 1.5 to 1.8 V. The PANI-Mn supercapacitor is investigated at the voltage window of 1.7 V. Figure 8C,D shows CV curve at different scanning rates and GCD curve at different current densities.…”

Section: Wwwadvelectronicmatdementioning

confidence: 99%

Electrochemical Performance of Manganese Coordinated Polyaniline

Chen

Xie

2019

Adv Elect Materials

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Manganese (II) coordinated polyaniline (PANI‐Mn) is designed as an energy‐storage electrode to improve electrochemical cycling stability of conductive polymer‐based supercapacitors. A PANI‐Mn electrode is synthesized through electro‐polymerization and hydrothermal coordination processes. A tetrahedron coordination structure is formed between manganese (II) dichloride and neighboring imino nitrogen to enforce the bonding strength of conjoint aniline units, restraining excessive volume expansion of the PANI molecule chain. Specific capacitance is enhanced from 350 F g−1 of PANI to 810 F g−1 of PANI‐Mn at 1 A g−1. Cycling capacitance retention is improved from 61% of PANI to 88% of PANI‐Mn at 5 A g−1 for 1000 cycles. PANI‐Mn shows larger response current than PANI at the same potential. First principle calculations prove that PANIs‐Mn exhibits higher density of state at Fermi level than PANI. The conjugated electron delocalization is strengthened in transitional metal‐coordinated conductive polymer, causing the improved conductivity of PANI‐Mn. Furthermore, an all‐solid‐state symmetric supercapacitor based on a PANI‐Mn electrode exhibits an energy density of 51.38 Wh kg−1 at a power density of 850 W kg−1 and a considerable cycling life of 82% after 1000 cycles at 5 A g−1. PANI‐Mn coordination polymer exhibits enhanced electrochemical stability, thus showing promise for energy storage application.

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Section: Wwwadvelectronicmatdementioning

confidence: 99%

Electrochemical Performance of Manganese Coordinated Polyaniline

Chen

Xie

2019

Adv Elect Materials

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“…[11] Generally,e fficient transfer of the charge carriers across the semiconductor interface is key for photocatalytice fficiency,a nd the heterostructure is beneficial to the interfacial charget ransfer. [31][32][33] Thus the photocatalytic activity can be significantly enhanced. Figure 6a shows the periodic on/off photocurrentr esponse of all samples under visible light.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical MoS₂@TiO₂ Heterojunctions for Enhanced Photocatalytic Performance and Electrocatalytic Hydrogen Evolution

Chen

Lü

et al. 2018

Chemistry An Asian Journal

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Hierarchical MoS @TiO heterojunctions were synthesized through a one-step hydrothermal method by using protonic titanate nanosheets as the precursor. The TiO nanosheets prevent the aggregation of MoS and promote the carrier transfer efficiency, and thus enhance the photocatalytic and electrocatalytic activity of the nanostructured MoS . The obtained MoS @TiO has significantly enhanced photocatalytic activity in the degradation of rhodamine B (over 5.2 times compared with pure MoS ) and acetone (over 2.8 times compared with pure MoS ). MoS @TiO is also beneficial for electrocatalytic hydrogen evolution (26 times compared with pure MoS , based on the cathodic current density). This work offers a promising way to prevent the self-aggregation of MoS and provides a new insight for the design of heterojunctions for materials with lattice mismatches.

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“…In inorganics/rGO composites, the improvement of capacitance is largely attributed to the conversion of mechanism so that the importance of extensive contact with electrolytes has declined. The materials with metallic element have higher specific capacitance due to active redox reactions, including Ni, Mo, Mn, Ti, Co, and others. For example, Chen et al showed that the sulfated NiMn‐layered double hydroxides/rGO composite as electrodes had enhanced performance in supercapacitor .…”

Section: Graphene For Rechargeable Batteriesmentioning

confidence: 99%

Recent Advances in Growth and Modification of Graphene‐Based Energy Materials: From Chemical Vapor Deposition to Reduction of Graphene Oxide

Cai

2019

Small Methods

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Graphene is recognized as the next generation of energy materials due to its spectacular physical properties. Meanwhile, there are diverse synthetic methods toward graphene, and these methods have unique advantages to impel graphene to be suitable for different energy devices. Chemical vapor deposition and reduction of graphene oxide are classical methods for preparing graphene with various lattice structures and layer numbers, resulting in the tunability of graphene properties, whereby the synthetic methods have significant effects on energy device performances. Therefore, this review pays close attention to the discrepancies of graphene‐based materials prepared by these two methods for use in solar cells, rechargeable batteries, and electrocatalysis for hydrogen evolution. Furthermore, the modifications of graphene are introduced to offset the weaknesses of synthetic methods. Then, the review introduces graphene‐based flexible energy devices because graphene prepared by these two methods shows similarity in their mechanical stability. Finally, other synthetic methods are shortly highlighted to explain the importance of these two methods. The analyses for the discrepancies and similarity of graphene‐based materials in classical energy devices from the aspect of synthesis are beneficial to guide the preparation and modifications of graphene for maximizing its application and promote practical usage in the future.

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MnO₂ nanoflowers and polyaniline nanoribbons grown on hybrid graphene/Ni 3D scaffolds by in situ electrochemical techniques for high-performance asymmetric supercapacitors

Abstract: MnO2 nanoflowers and polyaniline nanoribbons on nickel–graphene foams for supercapacitors provide an energy density of 41.0 W h kg−1 at 787.3 W kg−1.

Cited by 55 publications

References 57 publications

Electrochemical Performance of Manganese Coordinated Polyaniline

Electrochemical Performance of Manganese Coordinated Polyaniline

Hierarchical MoS₂@TiO₂ Heterojunctions for Enhanced Photocatalytic Performance and Electrocatalytic Hydrogen Evolution

Recent Advances in Growth and Modification of Graphene‐Based Energy Materials: From Chemical Vapor Deposition to Reduction of Graphene Oxide

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MnO2 nanoflowers and polyaniline nanoribbons grown on hybrid graphene/Ni 3D scaffolds by in situ electrochemical techniques for high-performance asymmetric supercapacitors

Abstract: MnO2 nanoflowers and polyaniline nanoribbons on nickel–graphene foams for supercapacitors provide an energy density of 41.0 W h kg−1 at 787.3 W kg−1.

Cited by 55 publications

References 57 publications

Electrochemical Performance of Manganese Coordinated Polyaniline

Electrochemical Performance of Manganese Coordinated Polyaniline

Hierarchical MoS2@TiO2 Heterojunctions for Enhanced Photocatalytic Performance and Electrocatalytic Hydrogen Evolution

Recent Advances in Growth and Modification of Graphene‐Based Energy Materials: From Chemical Vapor Deposition to Reduction of Graphene Oxide

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MnO₂ nanoflowers and polyaniline nanoribbons grown on hybrid graphene/Ni 3D scaffolds by in situ electrochemical techniques for high-performance asymmetric supercapacitors

Hierarchical MoS₂@TiO₂ Heterojunctions for Enhanced Photocatalytic Performance and Electrocatalytic Hydrogen Evolution