• 作者： Lo, Yi-Ling; Hwang, Bing-Joe
• 中文摘要： 本文依據所提之析氧機制推導得一能解釋鎳電極析氧之反應動力行為,並比較電鍍鎳與無電鍍鎳電極之電化學特性。鎳電極析氧過程中塔弗斜率的變化乃是由於鎳上氧化物覆蓋率隨電位變化所致。比較電流-電位曲線與動力模式得到鎳電極上NiOOH電氧化成NiO/sub 2/之反應速率常數可表示成:1.651*10/sup -13/exp(0.0468.eta.) mol cm/sup -2/s/sup -1/,無電鍍鎳電極上可表示成: 2.062*10/sup -15/exp(0.0503.eta.)mol cm/sup -2/s/sup -1/。 NiO /sub 2/與水反應析氧之化學反應速率常數為 Kc,求得電鍍鎳之Kc為:1.989*10/sup -7/mol cm/sup -2/ s/sup -1/,無電鍍鎳之Kc為:1.418*10/sup -7/mol cm/sup -2/s/sup -1/。由反應動力常數與反應動力模式可預測電極析氧之電流-電位曲線。
• 英文摘要： A simple kinetic model was developed to be capable of accounting for the mechanisms of oxygen evolution at nickel electrodes. The electrochemical characteristics of the electrodes prepared by either electrodeposition or electroless deposition were studied and compared. The change of Tafel slopes occurred as a result of the variation of coverage of nickel oxides on the surface during oxygen evolution. The coverage of the oxides as a function of potential were explored. The rate constant, k1, for the transformation of NiOOH to NiO/sub 2/ was also a function of overpotential and could be expressed as 1.651*10/sup -13/ exp(0.0468.eta.)mol cm/sup -2/s/sup -1/ for the electrodeposited Ni as well as 2.062*10/sup -15/ exp(0.0503.eta.)mol cm/sup -2/s/sup -1/ for the electroless Ni-P electrodes. The chemical rate constant for oxygen evolution was 1.989*10/sup -7/mol cm/sup -2/s/sup -1/ for the electrodeposited Ni and 1.418*10/sup -7/mol cm/sup -2/ s/sup -1/ for the electroless Ni- P. The quantitative prediction of current-potential would be achieved by the kinetic model with the rate constants.
• 中文關鍵字： 氧; 電極; 電鍍; 電催化; 動力學; 過電位
• 英文關鍵字： Oxygen; Electrode; Electrodeposition; Electrocatalysis; Kinetics; Overpotential