RETRACTED: Ultra-fast one-step synthesis and surface engineering of mesoporous 3D α- Fe2O3 hollow nanospheres for high-performance and stable negative electrode for supercapacitors

One-step electrodeposited MoS2@Ni-mesh as a high-performance negative electrode; a high energy density flexible and transparent asymmetric solid-state supercapacitor is fabricated.

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NiS nanosheets synthesized by one-step microwave for high-performance supercapacitor

Functional Materials Letters ◽

10.1142/s1793604721500351 ◽

2021 ◽

Author(s):

Jun Song ◽

Lijun Du ◽

Jingyi Wang ◽

Huaiping Zhang ◽

Yaodong Zhang ◽

...

Keyword(s):

Activated Carbon ◽

Energy Density ◽

Electrochemical Performance ◽

Power Density ◽

Microwave Radiation ◽

High Performance ◽

Negative Electrode ◽

Asymmetric Supercapacitor ◽

Capacity Retention ◽

One Step

The NiS nanosheets were fabricated using one-step microwave approach with the microwave radiation of 800 W for 1.5 min. Impressively, the NiS nanosheets revealed praiseworthy electrochemical performance, with a capacitance value of 1082.8 F ⋅ g[Formula: see text] at 1 A ⋅ g[Formula: see text] and 77.8% retention over 5000 cycles at 5 A ⋅ g[Formula: see text]. Moreover, an asymmetric supercapacitor was assembled with NiS as the positive electrode and activated carbon (AC) as the negative electrode. It shows 80.42% capacity retention after 8000 cycles and an energy density of 19.45 W ⋅ h ⋅ kg[Formula: see text] at a power density of 801.05 W ⋅ kg[Formula: see text].

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Microstructured nitrogen-doped graphene-Sn composites as a negative electrode for high performance lithium-ion hybrid supercapacitors

Sustainable Energy & Fuels ◽

10.1039/d1se01779a ◽

2022 ◽

Author(s):

Miguel Granados-Moreno ◽

Gelines Moreno-Fernández ◽

Rosalía Cid ◽

Juan Luis Gómez-Urbano ◽

Daniel Carriazo

Keyword(s):

High Performance ◽

Negative Electrode ◽

Lithium Ion ◽

Cycling Stability ◽

Nitrogen Doped ◽

Hybrid Supercapacitors ◽

Nitrogen Doped Graphene ◽

Doped Graphene ◽

One Step

Microstructured nitrogen-doped graphene-Sn synthetized in one step for high performance and long-term cycling stability lithium-ion capacitors.

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Boosting the Electrochemical Performance of Polyaniline by One-Step Electrochemical Deposition on Nickel Foam for High-Performance Asymmetric Supercapacitor

Polymers ◽

10.3390/polym14020270 ◽

2022 ◽

Vol 14 (2) ◽

pp. 270

Author(s):

Syed Shaheen Shah ◽

Himadri Tanaya Das ◽

Hasi Rani Barai ◽

Md. Abdul Aziz

Keyword(s):

Energy Storage ◽

High Performance ◽

Nickel Foam ◽

Conductive Polymer ◽

Negative Electrode ◽

Electrochemical Performances ◽

Asymmetric Supercapacitor ◽

Energy Storage Devices ◽

Storage Devices ◽

One Step

Energy generation can be clean and sustainable if it is dependent on renewable resources and it can be prominently utilized if stored efficiently. Recently, biomass-derived carbon and polymers have been focused on developing less hazardous eco-friendly electrodes for energy storage devices. We have focused on boosting the supercapacitor’s energy storage ability by engineering efficient electrodes in this context. The well-known conductive polymer, polyaniline (PANI), deposited on nickel foam (NF) is used as a positive electrode, while the activated carbon derived from jute sticks (JAC) deposited on NF is used as a negative electrode. The asymmetric supercapacitor (ASC) is fabricated for the electrochemical studies and found that the device has exhibited an energy density of 24 µWh/cm2 at a power density of 3571 µW/cm2. Furthermore, the ASC PANI/NF//KOH//JAC/NF has exhibited good stability with ~86% capacitance retention even after 1000 cycles. Thus, the enhanced electrochemical performances of ASC are congregated by depositing PANI on NF that boosts the electrode’s conductivity. Such deposition patterns are assured by faster ions diffusion, higher surface area, and ample electroactive sites for better electrolyte interaction. Besides advancing technology, such work also encourages sustainability.

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Facile Fabrication of High‐Performance Hybrid Supercapacitor by One-Step, Self‐Grown Copper Nanopillar Forest Anchored with Fe3O4 Anode

International Journal of Precision Engineering and Manufacturing-Green Technology ◽

10.1007/s40684-021-00328-5 ◽

2021 ◽

Author(s):

Jaehak Lee ◽

Jae Young Seok ◽

Minyang Yang ◽

Bongchul Kang

Keyword(s):

High Performance ◽

Hybrid Supercapacitor ◽

One Step ◽

Facile Fabrication

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N, S and Transition-Metal Co-Doped Graphene Nanocomposites as High-Performance Catalyst for Glucose Oxidation in a Direct Glucose Alkaline Fuel Cell

Nanomaterials ◽

10.3390/nano11010202 ◽

2021 ◽

Vol 11 (1) ◽

pp. 202

Author(s):

Yexin Dai ◽

Jie Ding ◽

Jingyu Li ◽

Yang Li ◽

Yanping Zong ◽

...

Keyword(s):

Fuel Cell ◽

Active Sites ◽

High Performance ◽

Glucose Oxidation ◽

Alkaline Fuel Cell ◽

Blank Group ◽

Graphene Nanocomposites ◽

Doped Graphene ◽

One Step ◽

Hydrothermal Approach

In this work, reduced graphene oxide (rGO) nanocomposites doped with nitrogen (N), sulfur (S) and transitional metal (Ni, Co, Fe) were synthesized by using a simple one-step in-situ hydrothermal approach. Electrochemical characterization showed that rGO-NS-Ni was the most prominent catalyst for glucose oxidation. The current density of the direct glucose alkaline fuel cell (DGAFC) with rGO-NS-Ni as the anode catalyst reached 148.0 mA/cm2, which was 40.82% higher than the blank group. The DGAFC exhibited a maximum power density of 48 W/m2, which was more than 2.08 folds than that of blank group. The catalyst was further characterized by SEM, XPS and Raman. It was speculated that the boosted performance was due to the synergistic effect of N, S-doped rGO and the metallic redox couples, (Ni2+/Ni3+, Co2+/Co3+ and Fe2+/Fe3+), which created more active sites and accelerated electron transfer. This research can provide insights for the development of environmental benign catalysts and promote the application of the DGAFCs.

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Nanostructured intermetallic InSb as a high-capacity and high-performance negative electrode for sodium-ion batteries

Sustainable Energy & Fuels ◽

10.1039/d1se00386k ◽

2021 ◽

Author(s):

Irshad Mohammad ◽

Lucie Blondeau ◽

Eddy Foy ◽

Jocelyne Leroy ◽

Eric Leroy ◽

...

Keyword(s):

Intermetallic Compound ◽

High Performance ◽

High Capacity ◽

Negative Electrode ◽

Sodium Ion ◽

Sodium Ion Batteries ◽

Negative Electrodes ◽

First Time

Following the trends of alloys as negative electrodes for Na-ion batteries, the sodiation of the InSb intermetallic compound was investigated for the first time. The benefit of coupling Sb with...

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Facile Synthesis of Uniform Mesoporous Nb2O5 Micro-Flowers for Enhancing Photodegradation of Methyl Orange

Materials ◽

10.3390/ma14143783 ◽

2021 ◽

Vol 14 (14) ◽

pp. 3783

Author(s):

Jian-Qing Qiu ◽

Huan-Qing Xie ◽

Ya-Hao Wang ◽

Lan Yu ◽

Fang-Yuan Wang ◽

...

Keyword(s):

Methyl Orange ◽

Active Sites ◽

High Performance ◽

Diffuse Reflectance Spectroscopy ◽

X Ray Diffraction ◽

Flower Structure ◽

Electron Microscopies ◽

Bet Method ◽

One Step ◽

Catalytic Active Sites

The removal of organic pollutants using green environmental photocatalytic degradation techniques urgently need high-performance catalysts. In this work, a facile one-step hydrothermal technique has been successfully applied to synthesize a Nb2O5 photocatalyst with uniform micro-flower structure for the degradation of methyl orange (MO) under UV irradiation. These nanocatalysts are characterized by transmission and scanning electron microscopies (TEM and SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) method, and UV-Vis diffuse reflectance spectroscopy (DRS). It is found that the prepared Nb2O5 micro-flowers presents a good crystal phases and consist of 3D hierarchical nanosheets with 400–500 nm in diameter. The surface area is as large as 48.6 m2 g−1. Importantly, the Nb2O5 micro-flowers exhibit superior catalytic activity up to 99.9% for the photodegradation of MO within 20 mins, which is about 60-fold and 4-fold larger than that of without catalysts (W/O) and commercial TiO2 (P25) sample, respectively. This excellent performance may be attributed to 3D porous structure with abundant catalytic active sites.

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