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题名	低温电沉积制备非晶态Ni-P催化电极的新工艺研究
作者	陈艳丽
学位类别	硕士
答辩日期	2003
授予单位	中国科学院过程工程研究所
授予地点	中国科学院过程工程研究所
导师	张懿
关键词	电沉积 非晶态Ni-P 析氢反应 电催化活性 析氢过电位
其他题名	Novel Technology of Preparing Amorphous Ni-P Catalytic Electrode by Low Temperature Electrodeposition
学位专业	化学工艺
中文摘要	高催化活性的阴极材料对于电解水制氢和氯碱工业具有重要的应用价值.该论文研究低温电沉积制备Ni-P合金催化电极的新工艺,内容分三部分:(1)实验研究了次亚磷酸钠镀液体系中主要工艺参数对Ni-P合金镀层磷含量和厚度的影响,并探讨了作用机理;(2)研究亚磷酸钠镀液体系中主要工艺参数对镀层磷含量和厚度的影响和作用机理;(3)通过一系列电化学实验比较不同电极的析析氢催化活性以更好地评价电极和新的工艺条件.
英文摘要	Cathode materials with high catalytic activity are very important in electrolytic industry and alkali producing industry. In this paper, a novel method, electrodeposition at low temperature for preparing Ni-P catalytic electrode is introduced and three aspects of the project are concerned. Firstly, the main factors that have effects on the P content and thickness of Ni-P alloys and their mechanism were discussed in the sodium hypophosphite deposition electrolyte. Then, on the basis of the former work, we continued to investigate the main factors and mechanism in the phosphorous acid deposition electrolyte. Finally, in order to evaluate the performance of the electrodes and determine the operation parameters of electrodeposition, a series of electrochemical experiments were carried out and the catalytic activities of different Ni-P electrodes prepared were estimated. Through the electrodeposition experiments in the sodium hypophosphite deposition electrolyte, we have found results as follows. Among the different factors which have effects on the P content, the concentration of NaEkPCh, CNaH2po2, is the most crucial one; the second is the concentration of NH4CI, Cnh4ci; but the effect of electrolyte's pH value and deposition current density, i, is very small. However, as far as the thickness of alloys is concerned, i exhibits the most crucial effect; the second one is Cnh4ci; but CNaH2PO2 and the pH value have a very slight effect. Considering all the evaluation, the optimum value of the operation parameters was determined as CNici2~0>2niol/L, CNaH2po2:=0.1mol/L, CNH4ci=3mol/L, z=500mA/cm2, pH=3.3. From the diagrams of XRD and SEM, it was shown that, when the P content of Ni-P electrodes prepared in the sodium hypophosphite deposition electrolyte exceeds 3wt%, the structure of alloys is amorphous. Compared with the traditional technologies, the new method has the following advantages: low operating temperature, simple deposition electrolyte, and thicker layers. From the experiments of electrodeposition in the phosphorous acid deposition electrolyte, it is found that, compared with the sodium hypophosphite deposition electrolyte, the phosphorous acid deposition electrolyte is more desirable because of its low cost, good stability and easiness to manage. The effects of the different factors on the P content can be compared as CNh4ci > i > Ch3po,- However, when it comes to their effects on the thickness of the alloys, the result becomes as Cnh^ci > Ch3po3> i- In this case, the best operation condition was determined as CNici:=0.2mol/L, CH3po3-0.1mol/L, CNH4ci=3mol/L, z=50OmA/cm2 and pH=1.0. From the diagrams of XRD and SEM, it is shown that, as the P content of Ni-P alloys increase, the structure gradually changes from crystalline to microcrystalline to amorphous. When the P content is 3.54wt%, the structure of alloys is typically amorphous. The results of electrochemical experiments of different Ni-P electrodes prepared from different conditions show that, under the same polarization condition, Ni-P electrodes have lower overpotential for hydrogen evolution reaction (HER) than Ni electrodes and embody high catalytic activity towards HER. When CNicu=0.2mol/L, Ch3po3 — O.lmol/L, CNH4ci=3mol/L, z=500mA/cm2 and pH=1.0, the Ni-P electrodes prepared have the highest catalytic activity, and the hydrogen evolution reaction rate on them is as 68 times much as that on Ni electrodes. From galvanostatic polarization curves, the value of the Tafel slope and exchange current density of Ni-P electrodes and Ni electrodes were obtained.
语种	中文
公开日期	2013-09-16
页码	65
内容类型	学位论文
源URL	[http://ir.ipe.ac.cn/handle/122111/1365]
专题	过程工程研究所_研究所（批量导入）
推荐引用方式 GB/T 7714	陈艳丽. 低温电沉积制备非晶态Ni-P催化电极的新工艺研究[D]. 中国科学院过程工程研究所. 中国科学院过程工程研究所. 2003.

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