氯碱工业镍-硫电极的研究

应用电化学沉积的方法制备Ni-S和Ni-Co-S合金镀层.通过测量电极的稳态极化曲线,研究电极的电催化活性和析氢反应活化能,考察热处理和电解液中杂质离子等因素对沉积层析氢活性的影响.实验结果显示,Ni-S电极镀层中的硫质量分数为11.59%时,电极的析氢活性最高,镀层呈非晶态或弱晶态结构,电极的析氢反应活化能为22.344 kJ/mol.

Ni-S合金析氢阴极的制备研究

以硫脲作为硫源,在改进的瓦特镀液体系中用电沉积方法获得N i-S合金镀层,系统地研究了硫脲浓度、电流密度、电沉积时间、镀液温度、pH值、有机添加剂等实验条件对N i-S合金电极析氢活性的影响.用重量分析法测定电沉积层中硫的含量,X-射线衍射技术表征镀层的晶形结构,稳态恒流极化法研究N i-S合金层的电催化活性.实验结果表明,电沉积得到的析氢活性较好的镍硫合金为非晶态结构和弱晶结构,硫含量为11.59%(重量比)时,N i-S合金电极具有优良的电催化性能,且在长期电解条件下电极仍有良好的析氢活性.

去合金化法制备多孔镍–硫–钴电极及其催化析氢性能

采用去合金化法制备了多孔Ni–S–Co(p-Ni–S–Co)合金电极。先依次电沉积制备Ni–S–Co中间层、Ni–S–Co–Zn合金镀层,随后将Ni–S–Co–Zn合金镀层浸泡于50°C的6 mol/L NaOH溶液中8 h以除去镀层中的Zn,即得p-Ni–S–Co合金镀层。表征了多孔镀层的形貌和结构,采用电化学方法着重研究了其催化析氢性能。结果表明,p-Ni–S–Co镀层由带花形纹理的球形颗粒构成,颗粒表面存在大量开放性孔隙,有效增大了镀层的比表面积。p-Ni–S–Co电极在20°C的28%NaOH溶液中时,电流密度为135 mA/cm2下的析氢超电势为108 mV,真实交换电流密度为3.95×10 4mA/cm2,催化析氢性能明显优于普通Ni–S–Co合金电极。

Nickel Sulfide/Graphene/Carbon Nanotube Composites as Electrode Material for the Supercapacitor Application in the Sea Flashing Signal System

This work presents NiS/graphene/carbon nanotube （NiS/GNS/CNT） composites as electrode material for the supercapacitor application in sea flashing signal systems. NiS nanosheets were closely anchored on the conductive GNS-CNT networks. As a result, the NiS/GNS/CNT electrode showed a high specific capacitance of 2 377 F.g^-1 at 2 mV.s^-1 and good cycling stability compared with the pure NiS （1 599F.g^-1）. The enhanced electrochemical performances are attributed to the synergetic effect between the conductive carbon and the pseudo-capacitive NiS. The high performance supercapacitor may provide application in the sea flashing signal system.