(3.238.173.209) 您好!臺灣時間:2021/05/16 21:30
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:粘恒銘
研究生(外文):NIAN,HERNG MING
論文名稱:硒碲化釕單晶的電化學行為研究
論文名稱(外文):Electrochemical Behavior of RuSeTe Single Crystal
指導教授:許健興許健興引用關係
指導教授(外文):SHEU,JIANG SHING
學位類別:碩士
校院名稱:逢甲大學
系所名稱:化學工程研究所
學門:工程學門
學類:化學工程學類
論文種類:學術論文
論文出版年:1995
畢業學年度:83
語文別:中文
論文頁數:103
中文關鍵詞:半導體環式伏安法頻域弛張法
外文關鍵詞:SemiconductorCyclic VoltammetryRelaxation Spectrum analysis
相關次數:
  • 被引用被引用:0
  • 點閱點閱:87
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
硒碲化釕單晶係屬過渡金屬II─VI族化合物且具黃鐵礦結構的半導體材料
。本論文乃藉環式伏安法掃描硒碲化釕單晶電極,再經能量分散X-射線頻
譜(EDX) 分析電極表面的原子組成,以研究其電化學特性。並以頻域弛張
法來求其平帶電位。硒碲化釕單晶電極在無水乙氰溶液中幾乎量測不到電
流,但在硫酸水溶中,以環式伏安法掃描硒碲化釕單晶電極時,在陰、陽
極均出現兩個主要波峰,此等波峰可歸因於硒碲化釕單晶電極表面產生氧
化∕還原所致。另外由EDX 分析電極表面原子組成,發現反應後的單晶電
極表面之硒原子及碲原子比例明顯下降,此乃因電極表面的硒原子及碲原
子已被氧原子取代所致。因此由實驗結果推斷硒碲化釕單晶電極腐蝕反應
的第一步為羥離子電吸2附於釕原子上,接著轉移至鄰近的硒原子及碲原
子上,繼而提出陽極分解反應之機構。此外,亦研究pH值對硒碲化釕單晶
電極腐蝕反應之影響,結果顯示其陽極分解電位隨pH值增加而降低,且當
pH值上升至 pH=13時,其氧氣生成反應電位卻明顯下降。最後再以頻域弛
張法求出硒碲化釕單晶電極在0.5M硫酸水溶液之平帶電位為-0.597V(SCE)
。並討論水溶液中pH值對硒碲化釕單晶電極之平帶電位的影響。結果顯示
其在高pH值較容易腐蝕,以致無法利用頻域弛張法求其平帶電位。由於硒
碲化釕單晶之能隙很小,且其在高pH值之水溶液中的腐蝕情形也相當嚴重
,故並不適合應用於光電池及光解池之電極材料。
Semiconducting RuSeTe belong to the family of transition metal
dichalcogenides crystallising in the pyrite structure. The
electrochemical behavior of RuSeTe has been studied using
cyclic voltammetry to sweep the single crystal electrode and
using Energy Dispersive X-ray Spectroscopy (EDX) to analyze the
atomic composition of electrode surface. We determined the flat
band potential of RuSeTe by using the relaxation spectrum
analysis. Current has not been detected when RuSeTe single
crystal electrode is in the nonaqueous solution. However,
cyclic voltammograms reveal two major peaks on the anodic and
cathodic sweeps for RuSeTe in 0.5M sulfuric acid aqueous
solution. These peaks were attributed to the oxidate and
reduce reaction on electrode surface. The EDX surface analysis
reveals preferential release of selenium and tellurium atoms
from the pyrite lattice. This resulting that selenium and
tellurium atoms are displaced by oxygen atoms on the surface.
It was proposed that the first step of corrosion reaction due
to the electroadsorption of the hydroxyl ion groups on
ruthenium atoms by the experimental results. These hydroxyl
ion groups are transferred to selenium and tellurium sites in
the second step. Thus, a mechanism for the anodic dissolution
of RuSeTe is proposed. Moreover, the influence of pH value
relating to RuSeTe corrosion reaction has been studied. Anodic
decomposition potential falls as the pH value rises. We
determined the flat band potential of RuSeTe in 0.5M sulfuric
acid aqueous solution to be -0.597V(SCE) by using the
relaxation spectrum analysis.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top