田口實驗法於單電流脈衝電鍍鉑之研究

Taguchi Method Applied to the Single Current Pulse Plating Platinum

王凱正(Kai-Jeng Wang)

指導教授 ： 黃進益

國立臺北科技大學/工程學院/化學工程研究所/碩士(2007年)

https://doi.org/10.6841/NTUT.2007.00055

摘要

鉑金屬不論對甲醇燃料電池成本及電極觸媒反應，均有很大之影響，因此本論文使用單電流脈衝電鍍法(single current pulse plating)鍍鉑於碳布上，鍍浴組成為:0.01M氯鉑酸 (H2PtCl6)、1.25M甲醇(Methanol)、1M鹽酸(HCl)。然而在電鍍過程中有許多控制因子(factor)如A:電流密度、B:通電時間、C:斷電時間、D:總通電量等。每個因子可有四水準(level)分別是電流密度80mAcm-2、100mAcm-2、120mAcm-2、140mAcm-2，通電時間(on-time) 0.075s、0.1s、0.15s、0.2s,斷電時間(off-time)為0.3s、0.5s、0.7s、0.9s以及總通電量2C/cm2、4C/cm2、6C/cm2、8C/cm2。利用田口實驗法(Taguchi method)選用L64(421)之直交表進行電鍍實驗，測其CV圖得到最佳甲醇波峰電流y值做為本實驗的回應值(response value)，將所測得的y值代入望大SN(signal to noise ration)值公式，可以判斷出最佳的參數組合為A:電流密度=120mAcm-2， B:通電時間=0.075s，C:斷電時間=0.7s，D:總通電量:8C/cm2;進一步使用變異數分析(The Analysis of Variance ANOVA)分析各因子間彼此互相影響程度，得到B因子影響程度最大，其次依序為D因子，C因子，A因子，而彼此交互作用以AxC最大，AxB次之，BxC最小。

關鍵字

田口實驗法 ； 單電流脈衝電鍍 ； 鉑觸媒

並列摘要

Platinum has much effects on the cost of direct methanol fuel cell (DMFC) and electrode catalysts. This research was focused on using single current pulse to plate Pt on carbon with the plating bath composition of 0.01M H2PtCl6, 1.25MCH3OH, 1M HCl. However, there are many experimental parameters (factor) to be investigated, such as (A): current density 、(B): on-time、(C): off-time、(D) : loading capacity, with four levels for each factor. The range of experimental parameters were between 80mAcm-2 and 140mAcm-2 for current density (A factor);0.075s to 0.2s for on-time (B factor);0.3s to 0.9s for off-time(C factor);2C/cm2 to 8C/cm2 for the catalyst loading capacity (D factor). The Taguchi method was adopted to determine the optimal process, using L64(421)orthogonal array for four electroplating parameters. By cyclic voltammetric test to check the methanol oxidation current y as a response value,then we can calculate the SN ratio by response values. In this way , the optimum conditions for these parameters were found . A: pulse current density is 120 mAcm-2, B: on-time is 0.075s C: off-time is 0.7s, D: the catalyst loading capacity is 8C/cm2. Respectively ,a statistical analysis of variance (ANOVA) was performed to check whether the process parameters were statistically significant or not. We obtain the results that B factor has most influence on the system, and A factor has less influence. However ,among the interaction of the factors (AxB AxC BxC ),AxC is more influence, and BxC is less.

並列關鍵字

Taguchi method ； single current pulse plating ； platinum catalysts

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