Seminaria Mechaniki Materiałów

kolor czcionki + kolor tła = plan do 7 dni.

2019-06-19
 plan 
14:00, Sala: Aula im. Wacława Olszaka, piętro II
prof. Jeng-Yu Lin
Tatung University, Taiwan

Electrodeposition of nickel sulfide based materials for hybrid supercapacitors

To promote the commercialization of supercapacitors (SCs) in the near future, the advance SCs should possess high operating voltage, great energy density and power density, and excellent cycling life. Consequently, hybrid SCs (HSCs) have been developed, which typically consist of battery-type faradic electrode as energy source and an EDLC-type electrode as power source [1,2]. Since the different potential windows of the two electrodes can increase the maximum operating voltage of the cell, therefore resulting in the enhancement of specific capacity and energy density.

We have successfully developed a facile pulse-reversal electrodeposition method to deposit Ni3S2 thin films on Ni foam [3]. The as-fabricated pulsed Ni3S2 electrode can deliver remarkable specific capacity up to 179.5 mAh g^-1 and 105.9 mAh g^-1 at charge–discharge current density at 2 A g^-1 and 32 A g^-1 in 1.0 M KOH aqueous electrolyte, respectively. Additionally, the optimal pulsed Ni3S2//carbon fiber cloth hybrid SC can be reversibly charged and discharged at a stable cell voltage of 1.8 V and generate an impressive specific capacity of 25.5 mAh g^-1 at current density of 0.5 A g^-1, which can deliver a maximum energy density of 28.8Wh kg^-1 at a power density of 684Wkg^-1. Secondly, we successfully decorated the one-dimensional conductive graphitic nanofibers (GNFs) with Ni3S2 nanosheets by using the developed pulse-reversal deposition method. The GNFs@Ni3S2 composite electrode exhibited almost three times larger discharge capacity than the pristine Ni3S2 electrode. Moreover, the GNFs@Ni3S2 based HSC device delivered an impressive specific capacity of 34.6 mAh g^-1 at 1 A g^-1 and the maximum energy density of 44.2 Wh kg^-1 at a power density of 1.2 kW kg^-1. Furthermore, the HSC retained 68.9% of its initial capacity after 5000 cycling test at 4 A g^-1. These results indicate the potential of the pulsed Ni3S2 based cathodes for high-performance HSCs.

[1] P. C. Chen , G. Z. Shen , Y. Shi , H. T. Chen, C. W. Zhou, ACS Nano 4 (2010) 4403.
[2] Z. S. Wu , W. Ren , D. W. Wang , F. Li , B. Liu, H. M. Cheng, ACS Nano, 4 (2010) 5835.
[3] S. W. Chou, J. Y. Lin, J. Electrochem. Soc., 162 (2015) A2762-A2769.

2019-06-12 14:00, Sala: Aula im. Wacława Olszaka, piętro II
dr inż. Marcin Krajewski

Towards magnetic wire-like nanostructures. Magnetic field as a growth parameter

2019-06-05 14:00, Sala: Aula im. Wacława Olszaka, piętro II
dr Mohsen Rezaee Hajidehi

Phase-field modelling of multivariant martensitic transformation in nano-indentation



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