Snowflake-like core-shell α-MnO2@δ-MnO2 for high performance asymmetric supercapacitor

Yu, Lei; Xu, Zongying; Wang, Dawei; Zhao, Jing; Zhang, Huaihao

doi:10.1016/j.electacta.2017.08.146

Cited by 92 publications

(48 citation statements)

References 48 publications

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“…After deep cycles, the strong characteristic peaks at 653.8 and 642.1 eV can be ascribed to Mn2p 1/2 and Mn2p 3/2 , respectively (Figure b), and in well accordance with those of previously reported MnO 2 nanomaterials, suggesting the existence of Mn 4+ . Moreover, the peaks at 646.5 eV can be assigned to the corresponding satellite peaks . HRTEM image of NC@MnO HHSs after 200 cycles (Figure d) also confirms that MnO 2 with the (211) plane occurs instead of MnO .…”

Section: Resultssupporting

confidence: 88%

“…[15,20,34] Moreover, the peaks at 646.5 eV can be assigned to the corresponding satellite peaks. [46,47] HRTEM image of NC@MnO HHSs after 200 cycles (Figure 8d) also confirms that MnO 2 with the (211) plane occurs instead of MnO. [48] However, the lattice fringes of MnO 2 become blurred after cycles, indicating that the MnÀ O bond weakens and Li + diffusion kinetics improves.…”

Section: Resultsmentioning

confidence: 62%

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Highly Reversible Lithium Storage of Nitrogen‐Doped Carbon@MnO Hierarchical Hollow Spheres as Advanced Anode Materials

et al. 2019

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The practical implementation of MnO‐based anode materials is still obstructed because of their short cyclic life and unsatisfactory rate performance, attributable to low conductivity, large volume variation and self‐aggregation of MnO during intense cycles. To overcome these obstacles, we successfully fabricated nitrogen‐doped carbon@MnO hierarchical hollow spheres through a novel approach. As anode nanomaterials for Li‐ion batteries, the nanocomposite possesses a highly reversible capacity of 1302 mAh g−1 after the 200th cycle at 0.1 Ag−1 and 964 mAh g−1 after the 500th cycle at 0.5 Ag−1, respectively. The prominent electrochemical performances of the nanocomposite may result from synthetic effects of nitrogen‐doped carbon hollow structures, nanosized MnO and the gradual generation of high‐oxide‐state manganese oxide on nitrogen‐doped carbon hollow spheres during intensive cycles. The aforementioned results also demonstrate that MnO nanocrystals can be well utilized by attaching to nitrogen‐doped carbon hollow spheres, which is a valid way to achieve excellent lithium storage properties for transition metal oxides.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 62%

Highly Reversible Lithium Storage of Nitrogen‐Doped Carbon@MnO Hierarchical Hollow Spheres as Advanced Anode Materials

et al. 2019

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“…The presence of variable chemical valences and defects will benefit the mobility of surface oxygen and improvement of oxygen storage capacity of manganese oxides . Therefore, manganese oxides have been widely used in field of battery anode material, super capacitor, pollutant degradation, heterogeneous catalysis, and so on.…”

Section: Introductionmentioning

confidence: 99%

Progress of Catalytic Oxidation of Formaldehyde over Manganese Oxides

2019

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Thermal catalytic oxidation is a promising and effective technique for the removal of harmful formaldehyde (HCHO) in indoor air. Manganese oxide is a mostly‐investigated non‐noble metal oxide catalyst and attracts much attention due to its better catalytic performance for formaldehyde oxidation at low temperature. In this review, the effect of manganese oxide crystal structure, surface morphology and microstructure, surface active oxygen species, reducibility as well as catalytic reaction conditions (temperature, relative humidity and HCHO initial concentration) on catalytic performance, and the catalytic mechanism over manganese oxide were summarized and discussed. The challenges and prospects for future development of manganese oxide in catalytic oxidation of formaldehyde are also covered.

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“…Among electrode materials, transition metal oxides (TMOs) show the higher performance ascribed to their complex valence states, while carbon materials usually shows a lower performance. It can reveals promising prospects of TMOs in supercapacitors application …”

Section: Introductionmentioning

confidence: 99%

Hierarchitecture Co ₂ (OH) ₃ Cl@FeCo ₂ O ₄ composite as a novel and high‐performance electrode material applied in supercapacitor

Wang

Peng

et al. 2020

Int J Energy Res

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Summary One‐step hydrothermal reaction has successfully been used to prepared three‐dimensional hierarchitecture Co2(OH)3Cl@FeCo2O4 composite without any annealing treatment. The samples are investigated to confirm the crystal structure, elemental composition, morphology structure and electrochemical performance. The results show the sample has a three‐dimensional hierarchitecture that nanoblocks are assembled with nanoparticles. And the specific surface area is 87.5 m2 g−1 and the total pore volume is 0.17 cm3 g−1. Meanwhile, the composite shows a high specific capacitance of 1110.0 F·g−1 at 1 A·g−1 and great cycling stability with 98.8% capacitance retention after 3000 cycles. To evaluate the electrochemical performances, the results are used to compare with the Co2(OH)3Cl and FeCo2O4 nanomaterials, indicating a higher capacitance and longer cycle stability shown by the as‐synthesized sample. The as‐synthesized Co2(OH)3Cl@FeCo2O4 composite has an outstanding electrochemical performance, predicting an enormous potential and promising future as a novel electrode material applied in supercapacitor.

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Snowflake-like core-shell α-MnO2@δ-MnO2 for high performance asymmetric supercapacitor

Cited by 92 publications

References 48 publications

Highly Reversible Lithium Storage of Nitrogen‐Doped Carbon@MnO Hierarchical Hollow Spheres as Advanced Anode Materials

Highly Reversible Lithium Storage of Nitrogen‐Doped Carbon@MnO Hierarchical Hollow Spheres as Advanced Anode Materials

Progress of Catalytic Oxidation of Formaldehyde over Manganese Oxides

Hierarchitecture Co ₂ (OH) ₃ Cl@FeCo ₂ O ₄ composite as a novel and high‐performance electrode material applied in supercapacitor

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Snowflake-like core-shell α-MnO2@δ-MnO2 for high performance asymmetric supercapacitor

Cited by 92 publications

References 48 publications

Highly Reversible Lithium Storage of Nitrogen‐Doped Carbon@MnO Hierarchical Hollow Spheres as Advanced Anode Materials

Highly Reversible Lithium Storage of Nitrogen‐Doped Carbon@MnO Hierarchical Hollow Spheres as Advanced Anode Materials

Progress of Catalytic Oxidation of Formaldehyde over Manganese Oxides

Hierarchitecture Co 2 (OH) 3 Cl@FeCo 2 O 4 composite as a novel and high‐performance electrode material applied in supercapacitor

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Hierarchitecture Co ₂ (OH) ₃ Cl@FeCo ₂ O ₄ composite as a novel and high‐performance electrode material applied in supercapacitor