Ternary nanocomposite of polyaniline/manganese dioxide/titanium nitride nanowire array for supercapacitor electrode

Chi, Xia; Xie, Yibing; Du, Hongxiu; Wang, Wei

doi:10.1007/s11051-014-2855-7

Cited by 47 publications

(22 citation statements)

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“…It was reported catalytic degradation and adsorptive bubble separation occur synchronously during the decontamination of methylene blue . At the same way, micromotors decompose hydrogen peroxide and continuously produce oxygen bubbles for propulsion, accompanied by generation of radicals to react with organic molecules for their subsequent degradation . The powerful motion produces significant mixing during the decontamination process and leads to a remarkably effective catalytic cleaning system.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors

Liu

et al. 2018

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Artificial micro/nanomotors that could perform diverse tasks autonomously at the micro/nanoscale have been emerging as promising tools in many practical applications. Electrochemical synthesis is one of the dominating methods to fabricate these micro/nanodevices with diverse geometries and material components. By changing the conditions of electrochemical deposition, the surface morphology, crystal structure, and hence the resultant performance of deposited material could be tailored. In the current work, a feasible fabrication strategy is presented in terms of three unique electrodeposition types (i.e., potentiodynamic, potentiostatic (PS), and galvanostatic) to synthesize different MnO2‐based micromotors. Distinct propulsion behavior as well as the catalytic degradation of azo‐dye organic waste (with methylene blue as the representative), between three kinds of MnO2‐based micromotors is clearly displayed, owing to the distinctive chemical composition and morphology designs. The activated R‐MnO2‐based micromotors in PS mode exhibit fast motion speed (up to 12 body length per second), leading to the highest degradation efficiency. Such propulsion performance is comparable with the microrockets made by noble metals such as Pt and Ag. The new protocol will have a profound impact on the design of synthetic micro/nanomotors and hold a considerable promise for their diverse applications.

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Section: Resultsmentioning

confidence: 99%

“…Among a diversity of polymorphs including α, β, γ, and ε ‐MnO 2 types, ramsdellite MnO 2 (R‐MnO 2 ) has a better performance as a catalyst. Besides, rhodochrosite MnCO 3 generates as a byproduct, probably following the reaction of

{Mn}^{2 +} + {CO}_{2} + {normalH}_{normal2} O \to {MnCO}_{normal3} + {2H}^{+}

…”

Section: Resultsmentioning

confidence: 99%

Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors

Liu

et al. 2018

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“…35 As shown in Table 1, the Z w value of 3DNC (11.7 U) and 3DNC/ MnO x (11.9 U) were smaller than those of the 2DNC (15.3 U) and 2DNC/MnO x (20.3 U) electrode, respectively. Those results were attributed to the unique hierarchical 3D structure based on Si pillar structure, which provided better electrolyte ion diffusion during fast charge and discharge processes.…”

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confidence: 83%

“…3f, where R s is the internal resistance, R ct is faradic charge transfer resistance, CPE is the double-layer capacitance, and Z w is the electrolyte resistance. 2,9,20,35 Typically the semi-circle in medium frequency regions reects the R ct . Before coating MnO x , the R ct value of 3DNC (23.6 U) was much smaller than that of the 2DNC electrode (65.5 U).…”

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Three-dimensional network of coaxial carbon nanotube/manganese oxides electrode for supercapacitors

et al. 2017

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A three-dimensional network of carbon nanotubes (3DNC) coaxially coated with manganese oxides (MnO x ) is used as an electrode for supercapacitors. 3DNC serves as a stable and conductive framework for controlled electrochemical deposition (ECD), and provides sufficient voids for fast ionic transport and diffusion. The coated thin layer MnO x reduces ion diffusion and electron transport distance, enabling fast reversible faradic reactions.As one of the most promising electrochemical energy storage materials, manganese oxides have been studied extensively as supercapacitor electrode materials due to their low cost, nontoxicity and theoretically high capacity of about 1370 F g À1 . 1-10In particular, low dimensional nanostructured MnO x with different morphologies has been developed as an electrode material and showed its advantages in charge storage capability. 4,9,11-15 However, its intrinsic poor electrical conductivity is a current drawback to utilize MnO x as a high-rate performance supercapacitor.1, [3][4][5]7 To overcome this problem, an effective way is to incorporate MnO x with other metal elements (Ni, Ru, Al, Sn and Pb etc.) 6,7 or porous, high surface area and conductive nanostructures such as carbonaceous sphere, 16 carbon nanotubes, 17 graphene 18 and conductive polymers. 19Among those for advanced metal oxide-based hybrid nanostructure design, coaxial thin layer structure with ordered nanostructure arrays is considered as one of promising approaches for achieving the goal. Previous research has shown only a very thin layer of metal oxide material (several tens of nanometers from the surface) participated in the redox reaction. 20 Hence, coaxial thin layer structure could allow cations to intercalate into entire active materials and shorten electron transport distance inside the active materials. Yamauchi Y. et al.17 reported on the development of multiwalled carbon nanotube-manganese oxide core-shell structures utilized for asymmetric supercapacitor applications which shows a specic capacitance (C sp ) of 185 F g À1 at a scan rate of 5 mV s À1 . Ordered nanostructure array is also an excellent candidate in aspect of providing a conductive path way not only for electron transport but also for resolving the ionic diffusion and transportation issues of supercapacitor electrodes. Zhu S. J. et al. 21 reported the development of coaxial mesoporous manganese dioxide/amorphous carbon nanotubes arrays for advanced asymmetric supercapacitors which exhibit the optimized pseudocapacitance performance (362 F g À1 ) with good cycling stability, and ideal rate capability. Ionic diffusion and transportation are critical points to improve superior energy density, power density and charge efficiency due to shorter diffusion length in void volume. 22,23 Longer life cycle and stronger volume retention during the charge and discharge process can be obtained through the nanostructures. Here, we demonstrate a coaxial thin layer MnO x hybrid nanostructure array for high performance MnO x supercapacitors.In our previous res...

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“…Normally, TiO 2 NTA can be modified by conductive polymers or carbon materials to improve the electrical conductivity . Our previous work showed that TiN NTA had very good conductivity for different electrochemical applications . Alternatively, it is reported that N‐TiO 2 shows higher conductivity compared with TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Bioelectrocatalytic performance of glucose oxidase/nitrogen-doped titania nanotube array enzyme electrode

Xie

Wang

2015

J. Chem. Technol. Biotechnol.

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BACKGROUND The substrate materials of enzyme electrodes strongly affect bioelectrocatalytic activity. TiO2 nanotube arrays (NTAs) show good affinity to glucose oxidase (GOx) but low conductivity. TiN NTAs show good conductivity but low affinity to GOx. Nitrogen‐doped TiO2 (N‐TiO2) NTA with good hydrophilicity and conductivity was designed to prepare a GOx/N‐TiO2 NTA enzyme electrode to promote bioelectrocatalytic performance. RESULTS N‐TiO2 NTA had a well‐ordered nanoarray structure with slightly distorted pore mouth and wrinkled nanotube wall. N‐TiO2 NTA exhibited decreased charge transfer resistance and similar contact angle to TiO2 NTA, presenting high electrical conductivity and good hydrophilicity. GOx/N‐TiO2 NTA exhibited highly increased current response at a potential of −0.45 V, presenting good bioelectrocatalysis towards glucose. A GOx/N‐TiO2 NTA enzyme electrode was used to fabricate a glucose biosensor, showing a high sensitivity of 733.17 µA mM−1 cm−2 and a linear range of 0.05–0.85 mmol L−1 and low detection limit of 2.9 µmol L−1 for glucose determination. It exhibited high selectivity in the presence of common interfering substances and was used to determine glucose in serum. It also had good reproducibility and long‐time storage stability. In addition, the GOx/N‐TiO2 NTA enzyme electrode was used to fabricate a glucose fuel cell, showing maximum power density of 23.92 µW cm−2 as well as good bioelectrocatalytic stability. CONCLUSION High bioelectrocatalytic activity and stability of GOx/N‐TiO2 NTA proved that N‐TiO2 NTA could act as a reasonable supporting substrate material for enzyme electrodes for various bioelectrocatalytic applications. © 2015 Society of Chemical Industry

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Ternary nanocomposite of polyaniline/manganese dioxide/titanium nitride nanowire array for supercapacitor electrode

Cited by 47 publications

References 40 publications

Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors

Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors

Three-dimensional network of coaxial carbon nanotube/manganese oxides electrode for supercapacitors

Bioelectrocatalytic performance of glucose oxidase/nitrogen-doped titania nanotube array enzyme electrode

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Ternary nanocomposite of polyaniline/manganese dioxide/titanium nitride nanowire array for supercapacitor electrode

Cited by 47 publications

References 40 publications

Electrochemical Deposition Tailors the Catalytic Performance of MnO2‐Based Micromotors

Electrochemical Deposition Tailors the Catalytic Performance of MnO2‐Based Micromotors

Three-dimensional network of coaxial carbon nanotube/manganese oxides electrode for supercapacitors

Bioelectrocatalytic performance of glucose oxidase/nitrogen-doped titania nanotube array enzyme electrode

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Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors

Electrochemical Deposition Tailors the Catalytic Performance of MnO₂‐Based Micromotors