scholarly journals Nanostructured Fe-Ni Sulfide: A Multifunctional Material for Energy Generation and Storage

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 597 ◽  
Author(s):  
Chen Zhao ◽  
Chunyang Zhang ◽  
Sanket Bhoyate ◽  
Pawan K. Kahol ◽  
Nikolaos Kostoglou ◽  
...  
Keyword(s):  
Current Density ◽  
Nickel Foam ◽  
Energy Generation ◽  
Catalytic Performance ◽  
Cell Potential ◽  
Energy Applications ◽  
Energy Needs ◽  
Energy Conversion And Storage ◽  
And Storage ◽  
A Current

Multifunctional materials for energy conversion and storage could act as a key solution for growing energy needs. In this study, we synthesized nanoflower-shaped iron-nickel sulfide (FeNiS) over a nickel foam (NF) substrate using a facile hydrothermal method. The FeNiS electrode showed a high catalytic performance with a low overpotential value of 246 mV for the oxygen evolution reaction (OER) to achieve a current density of 10 mA/cm2, while it required 208 mV at 10 mA/cm2 for the hydrogen evolution reaction (HER). The synthesized electrode exhibited a durable performance of up to 2000 cycles in stability and bending tests. The electrolyzer showed a lower cell potential requirement for a FeNiS-Pt/C system (1.54 V) compared to a standard benchmark IrO2-Pt/C system (1.56 V) to achieve a current density of 10 mA/cm2. Furthermore, the FeNiS electrode demonstrated promising charge storage capabilities with a high areal capacitance of 13.2 F/cm2. Our results suggest that FeNiS could be used for multifunctional energy applications such as energy generation (OER and HER) and storage (supercapacitor).

scholarly journals Boosting the activity of Prussian-blue analogue as efficient electrocatalyst for water and urea oxidation

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yongqiang Feng ◽  
Xiao Wang ◽  
Peipei Dong ◽  
Jie Li ◽  
Li Feng ◽  
...  
Keyword(s):  
Prussian Blue ◽  
Current Density ◽  
Cost Effective ◽  
Catalytic Performance ◽  
Dual Function ◽  
Prussian Blue Analogue ◽  
Energy And Environment ◽  
Energy Conversion And Storage ◽  
Electrolysis Potential ◽  
A Current

Abstract The design and fabrication of intricate hollow architectures as cost-effective and dual-function electrocatalyst for water and urea electrolysis is of vital importance to the energy and environment issues. Herein, a facile solvothermal strategy for construction of Prussian-blue analogue (PBA) hollow cages with an open framework was developed. The as-obtained CoFe and NiFe hollow cages (CFHC and NFHC) can be directly utilized as electrocatalysts towards oxygen evolution reaction (OER) and urea oxidation reaction (UOR) with superior catalytic performance (lower electrolysis potential, faster reaction kinetics and long-term durability) compared to their parent solid precursors (CFC and NFC) and even the commercial noble metal-based catalyst. Impressively, to drive a current density of 10 mA cm−2 in alkaline solution, the CFHC catalyst required an overpotential of merely 330 mV, 21.99% lower than that of the solid CFC precursor (423 mV) at the same condition. Meanwhile, the NFHC catalyst could deliver a current density as high as 100 mA cm−2 for the urea oxidation electrolysis at a potential of only 1.40 V, 24.32% lower than that of the solid NFC precursor (1.85 V). This work provides a new platform to construct intricate hollow structures as promising nano-materials for the application in energy conversion and storage.

Graphene, related two-dimensional crystals, and hybrid systems for energy conversion and storage

Science ◽  
2015 ◽  
Vol 347 (6217) ◽  
pp. 1246501 ◽  
Author(s):  
Francesco Bonaccorso ◽  
Luigi Colombo ◽  
Guihua Yu ◽  
Meryl Stoller ◽  
Valentina Tozzini ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Hybrid Systems ◽  
Dye Sensitized Solar Cells ◽  
Ionic Species ◽  
Two Dimensional ◽  
Storage Devices ◽  
Energy Needs ◽  
Energy Conversion And Storage ◽  
And Storage ◽  
Sensitized Solar Cells

Graphene and related two-dimensional crystals and hybrid systems showcase several key properties that can address emerging energy needs, in particular for the ever growing market of portable and wearable energy conversion and storage devices. Graphene’s flexibility, large surface area, and chemical stability, combined with its excellent electrical and thermal conductivity, make it promising as a catalyst in fuel and dye-sensitized solar cells. Chemically functionalized graphene can also improve storage and diffusion of ionic species and electric charge in batteries and supercapacitors. Two-dimensional crystals provide optoelectronic and photocatalytic properties complementing those of graphene, enabling the realization of ultrathin-film photovoltaic devices or systems for hydrogen production. Here, we review the use of graphene and related materials for energy conversion and storage, outlining the roadmap for future applications.

Effect of KHCO3, K2CO3 and CO2 on the Electrochemical Reduction of CO2 into Organics on a Cu Electrode for the Solar Energy Conversion and Storage

2014 ◽  
Vol 1640 ◽  
Author(s):  
Heng Zhong ◽  
Katsushi Fujii ◽  
Yoshiaki Nakano
Keyword(s):  
Elevated Temperature ◽  
Carbon Source ◽  
Solar Energy ◽  
Energy Conversion ◽  
Electrochemical Reduction ◽  
Current Density ◽  
High Concentration ◽  
Energy Conversion And Storage ◽  
Reduction Of Co2 ◽  
And Storage

ABSTRACTElectrochemical reduction of CO2 into useful organics combined with photovoltaics is thought to be one of the promising ways to effectively store and transport the solar energy. In most of the previous researches, CO2 bubbling in different solutions were used as the electrolyte. However, the effects of the electrolyte and the CO2 bubbling are not clear. Therefore, in this research, the effects of different electrolyte, CO2 bubbling, concentration of the electrolyte and temperature on the electrochemical reduction of CO2 on a Cu working electrode were studied. The results showed that the form of the carbon source in the electrolyte, such as HCO3-, CO32- and H2CO3, had a strong effect on this reaction, which was controlled by the pH of the electrolyte. Furthermore, high concentration of the HCO3- and elevated temperature can strongly improve the reaction current density.

A Hydrothermal Process for the Fabrication of Nickel Foam Based NiO and Co3O4 Nanostructures with Excellent Properties for Electrochemical Capacitors

2013 ◽  
Vol 291-294 ◽  
pp. 786-790
Author(s):  
Ling Bin Kong ◽  
Xiao Ming Li ◽  
Mao Cheng Liu ◽  
Xue Jing Ma ◽  
Yong Chun Luo ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Current Density ◽  
Nickel Foam ◽  
Hydrothermal Process ◽  
Film Structure ◽  
Proton Exchange ◽  
Fast Proton ◽  
Excellent Electrochemical Performance ◽  
Highly Dispersed ◽  
A Current

Unique NiO and Co3O4 nanostructures were successfully deposited on nickel foam (NF) substrate by a hydrothermal process. Both of them are highly dispersed on the surface of NF, showing a unique nanoporous film structure. They exhibit excellent electrochemical performance due to their effective porous structure which introducing facile electrolyte penetration and fast proton exchange. The highest specific capacitance of 231 and 493 F g-1 are achieved for NiO and Co3O4 electrodes at a current density of 0.5 A g-1, respectively.

Nanoporous hexagonal TiO2 superstructure as a multifunctional material for energy conversion and storage

2015 ◽  
Vol 3 (7) ◽  
pp. 3500-3510 ◽  
Author(s):  
Eun Joo Lee ◽  
Inho Nam ◽  
Jongheop Yi ◽  
Jin Ho Bang
Keyword(s):  
Energy Conversion ◽  
Electrode Material ◽  
Energy Applications ◽  
Multifunctional Material ◽  
Energy Conversion And Storage ◽  
And Storage

A new, exotic nanostructured TiO2 is employed as an advanced electrode material for energy applications.

Co3S4/NiCo2S4 Nano-Arrays on Nickel Foam as Energy Storage for Supercapacitors

2021 ◽  
Vol 16 (6) ◽  
pp. 891-904
Author(s):  
Xiang-Sen Meng ◽  
Jun Xiang ◽  
Nan Bu ◽  
Yan Guo ◽  
Sroeurb Loy ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Current Density ◽  
Retention Rate ◽  
Nickel Foam ◽  
Maximum Energy ◽  
Capacity Retention ◽  
A Current

In this work, Co3S4/NiCo2S4 nano-arrays electrode with Co3S4 nanocones and NiCo2S4 nanosheets interlaced arrangement are prepared by the promising hydrothermal method. Compared with single Co3S4/NF or NiCo2S4/NF electrode, the prepared Co3S4/NiCo2S4/NF electrode exhibits excellent specific capacitance. At a current density of 2 mA cm−2, the surface capacitance is as high as 9036 mF cm−2, and it still maintains a surface capacitance of 5664 mF cm−2 at a current density of 8 mA cm−2. Co3S4/NiCo2S4/NF||ASC has a high electrochemical performance with a maximum energy density of 0.62 Wh cm−3 and a power density of 15.94 W cm−3. At a current density of 5 mA cm−2, the capacity retention rate is 83.75% after 3000 cycles.

scholarly journals Biochar from Spent Malt Rootlets and Its Application to an Energy Conversion and Storage Device

Chemosensors ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 57
Author(s):  
John Vakros ◽  
Ioannis D. Manariotis ◽  
Vassilios Dracopoulos ◽  
Dionissios Mantzavinos ◽  
Panagiotis Lianos
Keyword(s):  
Activated Carbon ◽  
Fuel Cell ◽  
Energy Conversion ◽  
Storage Device ◽  
Alkaline Electrolyte ◽  
Energy Storage Device ◽  
Supercapacitor Electrode ◽  
Energy Applications ◽  
Energy Conversion And Storage ◽  
And Storage

Activated carbon obtained from biomass wastes was presently studied in order to evaluate its applicability in an energy storage device. Biochar was obtained by the carbonization of spent malt rootlets and was further processed by mild treatment in NaOH. The final product had a specific surface of 362 m2 g−1 and carried Na, P and a few mineral sites. This material was first characterized by several techniques. Then it was used to make a supercapacitor electrode, which reached a specific capacitance of 156 F g−1. The supercapacitor electrode was combined with a photocatalytic fuel cell, making a simple three-electrode device functioning with a single alkaline electrolyte. This device allows solar energy conversion and storage at the same time, promoting the use of biomass wastes for energy applications.

scholarly journals Physical, Chemical, and Electrochemical Properties of Redox-Responsive Polybenzopyrrole as Electrode Material for Faradaic Energy Storage

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2883 ◽  
Author(s):  
Bushra Begum ◽  
Salma Bilal ◽  
Anwar ul Haq Ali Shah ◽  
Philipp Röse
Keyword(s):  
Energy Storage ◽  
Electrochemical Properties ◽  
Electrode Materials ◽  
Reaction Parameters ◽  
Physical Chemical ◽  
Redox Responsive ◽  
Energy Conversion And Storage ◽  
And Storage ◽  
Polymerization Conditions ◽  
A Current

Polybenzopyrrole (Pbp) is an emerging candidate for electrochemical energy conversion and storage. There is a need to develop synthesis strategies for this class of polymers that can help improve its overall properties and make it as suitable for energy storage applications as other well-studied polymers in this substance class, such as polyaniline and polypyrrole. In this study, by synthesizing Pbp in surfactant-supported acidic medium, we were able to show that the physicochemical and electrochemical properties of Pbp-based electrodes are strongly influenced by the respective polymerization conditions. Through appropriate optimization of various reaction parameters, a significant enhancement of the thermal stability (up to 549.9 °C) and the electrochemical properties could be achieved. A maximum specific capacitance of 166.0 ± 2.0 F g−1 with an excellent cycle stability of 87% after 5000 cycles at a current density of 1 A g−1 was achieved. In addition, a particularly high-power density of 2.75 kW kg−1 was obtained for this polybenzopyrrole, having a gravimetric energy density of 17 Wh kg−1. The results show that polybenzopyrroles are suitable candidates to compete with other conducting polymers as electrode materials for next-generation Faradaic supercapacitors. In addition, the results of the current study can also be easily applied to other systems and used for adaptations or new syntheses of advanced hybrid/composite Pbp-based electrode materials.

Practical use of polymer brushes in sustainable energy applications: interfacial nanoarchitectonics for high-efficiency devices

2019 ◽  
Vol 48 (3) ◽  
pp. 814-849 ◽  
Author(s):  
Juan M. Giussi ◽  
M. Lorena Cortez ◽  
Waldemar A. Marmisollé ◽  
Omar Azzaroni
Keyword(s):  
Energy Conversion ◽  
Polymer Brushes ◽  
High Efficiency ◽  
Sustainable Energy ◽  
Storage Devices ◽  
Energy Applications ◽  
Energy Conversion And Storage ◽  
Improved Performance ◽  
New Perspective ◽  
And Storage

Polymer brushes provide a new perspective from which to consider the development of energy conversion and storage devices with improved performance and efficiency.

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