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Yakun Zhang,Jianling Li,Feiyu Kang,Xindong Wang,Feng Ye,Jun Yang 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.6
The polymer of (2,2-dimethyl-1,3-propanediaminebis(salicylideneaminato))-nickel(II), Ni(saldMp), was deposited on multi-walled carbon nanotubes (MWCNTs) substrate by the route of potential linear sweep. The nano structures of poly[Ni(saldMp)] have been obtained by adjusting the monomer concentration of 0.1, 0.2, 0.5, 1.0 and 1.5 mmol L−1. The poly[Ni(saldMp)] prepared in acetonitrile solution with monomer concentration of 1.0 mmol L−1 shows the fastest growth rate. The effects of potential window on charge-discharge efficiency and electrodeposition scan number on capacitance performance were discussed. Poly[Ni(saldMp)] prepared with less electrodeposition scans exhibits higher capacitance, but this goes against the improvement of the whole electrode capacitance. Sample with 8 deposition scans is the best compromise with the geometric specific capacitance 3.53 times as high as that of pure MWCNTs, and 1.24 times for the gravimetric specific capacitance under the test potential window 0.0-1.0 V.
Zhang, Yakun,Li, Jianling,Kang, Feiyu,Wang, Xindong,Ye, Feng,Yang, Jun Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.6
The polymer of (2,2-dimethyl-1,3-propanediaminebis(salicylideneaminato))-nickel(II), Ni(saldMp), was deposited on multi-walled carbon nanotubes (MWCNTs) substrate by the route of potential linear sweep. The nano structures of poly[Ni(saldMp)] have been obtained by adjusting the monomer concentration of 0.1, 0.2, 0.5, 1.0 and 1.5 mmol $L^{-1}$. The poly[Ni(saldMp)] prepared in acetonitrile solution with monomer concentration of 1.0 mmol $L^{-1}$ shows the fastest growth rate. The effects of potential window on charge-discharge efficiency and electrodeposition scan number on capacitance performance were discussed. Poly[Ni(saldMp)] prepared with less electrodeposition scans exhibits higher capacitance, but this goes against the improvement of the whole electrode capacitance. Sample with 8 deposition scans is the best compromise with the geometric specific capacitance 3.53 times as high as that of pure MWCNTs, and 1.24 times for the gravimetric specific capacitance under the test potential window 0.0-1.0 V.
A Novel Technique for Dressing Fixed Abrasive Lapping Pad with Abrasive Water Jet
Zhankui Wang,Yakun Yang,Zhao Zhang,Minghua Pang,Mingchao Liang,Lijie Ma,Jianxiu Su 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.6
The dressing method and dressing quality of the fixed abrasive lapping pad significantly impact the processing efficiency and surface quality of the workpiece material. Aiming at the problems of poor dressing effect and high damage degree of the lapping pad in the existing fixed abrasive dressing technology, a new technology using abrasive water jet for dressing is proposed. The self-developed abrasive water jet system was used to conduct a dressing test on a fixed abrasive lapping pad with a copper content of 30%. The influence of jet pressure, nozzle target distance, abrasive concentration and injection angle on the dressing effect were discussed, and the influence mechanism was analyzed by discrete element simulation. The results show that the dressing effect of the abrasive water jet is good. The dressing quality first increases and then decreases with the increase of jet pressure, nozzle target distance and injection angle, and increases with the increase of abrasive concentration. The influence mechanism of each parameter is closely related to the residual height of the lapping pad surface after dressing. The higher the residual height, the rougher the lapping pad surface, and the better the dressing effect of the lapping pad.
Feng Ye,Yanpeng Cao,Weiwei Han,Yakun Yang,Yuancheng Feng,Peng Liu,Chao Xu,Xiaoze Du,양우철,Liu Guicheng 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
A highly active RuO2IrO2 electrocatalyst was developed via dip-coating/calcination method for oxygen evolution reaction (OER). The catalyst on Ti substrate with a 7/3 molar ratio between Ru and Ir showed the highest electrocatalytic activity for OER among composite samples in different molar ratios. Moreover, the properties of RuO2IrO2 grown on carbon paper were evaluated by proton exchange membrane water electrolysis single cell. Compared with the micron-particle structure of RuO2IrO2 catalyst on the Ti substrate, the catalyst grown on the carbon paper showed a novel nano dendrite shape and can be used directly as the gas diffusion electrode. Owing to the large surface area of the catalyst, the nano dendrite-shaped RuO2IrO2 catalyst exhibits excellent OER performance in the single cell. Furthermore, a cell voltage of 2.50 V is achieved under 200mA cm2 at 30 oC by using the optimal composition RuO2IrO2 (Ru : Ir=7/3) and the commercial 20% Pt/C as anode and cathode, respectively.