Performance-improved Li-O2 batteries by tailoring the phases of MoxC porous nanorods as an efficient cathode

Nanoscale ◽  
2018 ◽  
Vol 10 (31) ◽  
pp. 14877-14884 ◽  
Author(s):  
Hong Yu ◽  
Khang Ngoc Dinh ◽  
Yuanmiao Sun ◽  
Haosen Fan ◽  
Yonghui Wang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Lower Charge ◽  
Lower Charge Transfer Resistance

By tailoring the phases of MoxC, α-MoC1−x exhibits better Li-O2 battery performance than β-Mo2C with a lower charge-transfer resistance and better O2 adsorption.

scholarly journals Structural refinement and electrochemical properties of one dimensional (ZnO NRs)1−x(CNs)x functional hybrids for serotonin sensing studies

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Sajid B. Mullani ◽  
Ananta G. Dhodamani ◽  
Annadanesh Shellikeri ◽  
Navaj B. Mullani ◽  
Anita K. Tawade ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Electrochemical Properties ◽  
Surface Area ◽  
Limit Of Detection ◽  
Zno Nanorods ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Bet Analysis ◽  
Lower Charge ◽  
Lower Charge Transfer Resistance

Abstract Herein, the efficient serotonin (5-HT) sensing studies have been conducted using the (ZnO NRs)1−x(CNs)x nanocomposites (NCs) having appropriate structural and electrochemical properties. Initially, the different compositions of ZnO nanorods (NRs), with varying content of carbon nanostructures (CNs=MWCNTs and RGO), are prepared using simple in-situ wet chemical method and thereafter these NCs have been characterized for physico-chemical properties in correlation to the 5-HT sensing activity. XRD Rietveld refinement studies reveal the hexagonal Wurtzite ZnO NRs oriented in (101) direction with space group ‘P63mc’ and both orientation as well as phase of ZnO NRs are also retained in the NCs due to the small content of CNs. The interconnectivity between the ZnO NRs with CNs through different functional moieties is also studied using FTIR analysis; while phases of the constituents are confirmed through Raman analysis. FESEM images of the bare/NCs show hexagonal shaped rods with higher aspect ratio (4.87) to that of others. BET analysis and EIS measurements reveal the higher surface area (97.895 m2/g), lower charge transfer resistance (16.2 kΩ) for the ZCNT 0.1 NCs to that of other NCs or bare material. Thereafter, the prepared NCs are deposited on the screen printed carbon electrode (SPCE) using chitosan as cross-linked agent for 5-HT sensing studies; conducted through cyclic voltammetry (CV) and square wave voltammetry (SWV) measurements. Among the various composites, ZCNT0.1 NCs based electrodes exhibit higher sensing activity towards 5-HT in accordance to its higher surface area, lower particle size and lower charge transfer resistance. SWV measurements provide a wide linear response range (7.5–300 μM); lower limit of detection (0.66 μM), excellent limit of quantification (2.19 μM) and good reproducibility to ZCNT 0.1 NCs as compared to others for 5-HT sensing studies.

Benign role of Bi on an electrodeposited Cu2O semiconductor towards photo-assisted H2 generation from water

2016 ◽  
Vol 4 (23) ◽  
pp. 9244-9252 ◽  
Author(s):  
Sanjib Shyamal ◽  
Paramita Hajra ◽  
Harahari Mandal ◽  
Aparajita Bera ◽  
Debasis Sariket ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Surface Morphology ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Water Reduction ◽  
H2 Generation ◽  
Defect Sites ◽  
Lower Charge ◽  
Lower Charge Transfer Resistance

Bi-modified Cu2O possesses a superior photocatalytic water reduction due to its surface morphology, smaller crystallinity, lower charge transfer resistance, and fewer defect sites.

scholarly journals Three-Dimensional Fibrous Iron as Anode Current Collector for Rechargeable Zinc–Air Batteries

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1429 ◽  
Author(s):  
Ramin Khezri ◽  
Kridsada Jirasattayaporn ◽  
Ali Abbasi ◽  
Thandavarayan Maiyalagan ◽  
Ahmad Azmin Mohamad ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Three Dimensional ◽  
Current Collector ◽  
Charge Transfer Resistance ◽  
Electrochemical Characteristics ◽  
Anode Current ◽  
Transfer Resistance ◽  
Lower Charge ◽  
Zinc Air Batteries ◽  
Lower Charge Transfer Resistance

A three-dimensional (3D) fibrous structure with a high active surface and conductive pathway proved to be an excellent anode current collector for rechargeable zinc–air batteries (ZABs). Herein, a cost-effective and highly stable zinc (Zn) electrode, based on Zn electrodeposited on iron fibers (Zn/IF), is duly examined. Electrochemical characteristics of the proposed electrode are seen to compete with a conventional zinc/nickel foam (Zn/NF) electrode, implying that it can be a suitable alternative for use in ZABs. Results show that the Zn/IF electrode exhibits an almost similar trend as Zn/NF in cyclic voltammetry (CV). Moreover, by using a Zn/IF electrode, electrochemical impedance spectroscopy (EIS) demonstrates lower charge transfer resistance. In the application of a rechargeable ZAB, the fibrous Zn/IF electrode exhibits a high coulombic efficiency (CE) of 78%, close to the conventional Zn/NF (80%), with almost similar capacity and lower charge transfer resistance, after 200 charge/discharge cycles. It is evident that all the positive features of Zn/IF, especially its low cost, shows that it can be a valuable anode for ZABs.

Edge-carboxylated graphene nanoplatelets as oxygen-rich metal-free cathodes for organic dye-sensitized solar cells

2014 ◽  
Vol 7 (3) ◽  
pp. 1044-1052 ◽  
Author(s):  
Myung Jong Ju ◽  
In-Yup Jeon ◽  
Kimin Lim ◽  
Jae Cheon Kim ◽  
Hyun-Jung Choi ◽  
...  
Keyword(s):  
Dye Sensitized Solar Cells ◽  
Charge Transfer Resistance ◽  
Electrochemical Stability ◽  
Graphene Nanoplatelets ◽  
Organic Dye ◽  
Transfer Resistance ◽  
Dye Sensitized ◽  
Lower Charge ◽  
Sensitized Solar Cells ◽  
Lower Charge Transfer Resistance

Edge-carboxylated graphene nanoplatelets (ECGnPs) prepared by the dry ball-milling of graphite showed lower charge-transfer resistance (RCT) and better electrochemical stability for the JK-303-based solar cell with Co(bpy)32+/3+ redox couple.

scholarly journals Effect of nanostructured carbon coatings on the electrochemical performance of Li1.4Ni0.5Mn0.5O2+ x -based cathode materials

2016 ◽  
Vol 7 ◽  
pp. 1960-1970 ◽  
Author(s):  
Konstantin A Kurilenko ◽  
Oleg A Shlyakhtin ◽  
Oleg A Brylev ◽  
Dmitry I Petukhov ◽  
Alexey V Garshev
Keyword(s):  
Diffusion Coefficient ◽  
Charge Transfer ◽  
Specific Capacity ◽  
Charge Transfer Resistance ◽  
Poly Vinyl Alcohol ◽  
Nanostructured Carbon ◽  
Transfer Resistance ◽  
Carbon Coatings ◽  
Lithium Diffusion Coefficient ◽  
Electrochemical Cycling

Nanocomposites of Li1.4Ni0.5Mn0.5O2+ x and amorphous carbon were obtained by the pyrolysis of linear and cross-linked poly(vinyl alcohol) (PVA) in presence of Li1.4Ni0.5Mn0.5O2+ x . In the case of linear PVA, the formation of nanostructured carbon coatings on Li1.4Ni0.5Mn0.5O2+ x particles is observed, while for cross-linked PVA islands of mesoporous carbon are located on the boundaries of Li1.4Ni0.5Mn0.5O2+ x particles. The presence of the carbon framework leads to a decrease of the polarization upon cycling and of the charge transfer resistance and to an increase in the apparent Li+ diffusion coefficient from 10−16 cm2·s−1 (pure Li1.4Ni0.5Mn0.5O2+ x ) to 10−13 cm2·s−1. The nanosized carbon coatings also reduce the deep electrochemical degradation of Li1.4Ni0.5Mn0.5O2+ x during electrochemical cycling. The nanocomposite obtained by the pyrolysis of linear PVA demonstrates higher values of the apparent lithium diffusion coefficient, a higher specific capacity and lower values of charge transfer resistance, which can be related to the more uniform carbon coatings and to the significant content of sp2-hybridized carbon detected by XPS and by Raman spectroscopy.

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