Structural and Electrocatalytic Characteristics of Electrodeposited Nickel-Molybdenum Alloys

電鍍法製備的鎳－鉬合金的結構及電催化特性

張裕祺(Yu-Chi Chang) ； 范光城(Kuang-Cheng Fan) ； 林俊一(Chun-I Lin)

《Journal of the Chinese Institute of Chemical Engineers》 33卷5期 (2002/09) Pp. 499-507

https://doi.org/10.6967/JCICE.200209.0499

摘要

本研究利用電沉積方法自檸檬酸鍍浴以旋轉圓盤電極技術製備鎳－鉬合金。利用EDS可測求鍍層組成，而由XRD可量得結構參數。依XRD之結果知鍍層結構隨鉬含量而變化，隨鉬之介入鎳晶粒尺寸乃縮小，而晶格則擴張。當鍍層中鉬的重量含量超過約21％時，鎳－鉬合金呈明顯的非晶態。研究中亦證明鎳－鉬合金對鹼性液的析氫反應具有催化效能，且催化活性隨鍍層中鉬含量的增加而增強。又鎳晶粒尺寸亦會影響到析氫反應之Tafel斜率。此外在二環己烯－1－酮的電催化加氫反應成環己酮的研究亦發現鉬重量含量2％的合金鍍層具甚高選擇性及電流效率。

並列摘要

The preparation of Ni-Mo alloys by electrodeposition from citrate baths was studied. The electrodeposition experiments were performed on rotating disk electrodes. The chemical composition of the Ni-Mo deposits was analyzed by energy dispersive X-ray spectroscopy. The structure of each sample was characterized by X-ray diffraction. It was found that the structure of the deposit varies with the molybdenum content in the deposit. The incorporation of molybdenum results in refinement of the nickel crystallite and expansion of the nickel lattice. Deposits with a Mo content of about 21 wt% or more exhibited an amorphous structure. The deposits obtained have been studied with the objective of qualitatively comparing and assessing their electrocatalytic activities as hydrogen evolution electrode in alkaline solutions. The electrocatalytic activity for hydrogen evolution increases with increasing Mo content. The size of the nickel crystallite also exerts certain effect on the Tafel slope of the hydrogen-evolution reaction. The electrocatalytic hydrogenation of 2-cyclohexen-l-one to cyclohexanone has also been investigated using the Ni-Mo deposits prepared. High selectivity and high current efficiency of the carbon-carbon double bond hydrogenation were observed with the Ni-Mo alloy containing 2 wt% Mo.

並列關鍵字

Electrodeposition ； Ni-Mo alloys ； HER ； ECH