Fabrication of the Composites by Electrodepositing the Nickel Selenide on the CarbonNanotube/Stainless Steel Substrate for Energy Storage and Conversion

• Main Authors: CHEN, TING-YU, 陳廷宇
• Other Authors: LIN, TSUNG-WU
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/2g7ewx

碩士 === 東海大學 === 化學系 === 107 === In this study, the composites consisting of nickel selenide (NiSe) and carbon nanotubes (CNTs) were synthesized onto stainless steel plate (SS plate) by pulse electrodeposition and they were used as the free-standing and binder-free electrode materials for supercapacitors and water splitting. Compared with other alkaline solutions such as NaOH and KOH, the composites exhibited the best rate performance, cyclic stability and the highest operating voltage of 0.45 V in 3 M LiOH solution. On the other hand, the effect of synthetic condition on electrode performance was investigated. The electrode fabricated by 100 cycles of electrodeposition showed specific capacitance of 1000 F/g at 1 A/g and capacitance retention was about 85 % at 8 A/g. Finally, nickel selenide based composites and reduced graphene oxide were respectively used as positive and negative electrodes in the fabrication of asymmetric supercapacitor (ASC). ASC device showed operating voltage of 1.65 V and specific capacitance of 85.03 F/g at 1 A/g. Furthermore, ASC delivered the maximum energy density of 32.15 Wh/kg at power density of 824.36 W/kg and remained energy density of 13.38 Wh/kg at power density of 6.6 kW/kg. The composites were also utilized as the bifunctional electrocatalysts for water splitting. In this case, the electrode prepared by 400 cycles of electrodeposition showed the highest activities towards hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). In 1 M KOH, our composites could achieve a catalytic current density of 10 and 50 mA cm−2 at overpotentials of 174 and 267 mV for HER and OER, respectively. Finally, two-electrode configuration was adopted to employ our composites as both the cathode and the anode, which demonstrated that the voltage of 1.71 V was required to achieve the current density of 10 mA/cm2.