研究生: |
張立翔 Li-Hsiang Chang |
---|---|
論文名稱: |
濺鍍法製備鉬鎳雙金屬薄膜應用於高效析氫反應與鹼性交換膜水電解 Bimetallic Molybdenum-Nickel Thin Film Fabricated by a Sputtering Technique for Highly Efficient Hydrogen Evolution Reaction and Alkaline Exchange Membrane Water Electrolysis |
指導教授: |
郭東昊
Dong-Hau Kuo |
口試委員: |
郭東昊
Dong-Hau Kuo 柯文政 Wen-Cheng Ke 薛人愷 Ren-Kae Shiue |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 材料科學與工程系 Department of Materials Science and Engineering |
論文出版年: | 2023 |
畢業學年度: | 111 |
語文別: | 中文 |
論文頁數: | 136 |
中文關鍵詞: | 磁控射頻濺鍍 、整體水電解 、析氫反應 、鉬鎳合金 、層狀雙金屬氫氧化物 |
外文關鍵詞: | RF sputtering, Overall water splitting, Hydrogen evolution reaction, Mo-Ni alloy, Layered double hydroxide |
相關次數: | 點閱:270 下載:0 |
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本研究透過磁控射頻濺鍍及電化學沉積技術,在鎳泡棉上成功製備出在鹼性溶液下具有優異 HER 表現之陰極,以及具有雙層結構 OER 表現之陽極。實驗中,首先濺鍍鉬鎳雙金屬薄膜在鎳泡棉上,並透過調整鉬鎳靶材之莫耳比例、濺鍍功率以及沉積時間來找到最佳參數,以獲得最佳陰極材料 MN6-90。接著,藉由電化學沉積技術將NiFe 雙金屬氫氧化物(NiFe-LDH)沉積到 MN6-90 濺鍍薄膜上,並透過調整電化學沉積之電解液濃度、電化學沉積電壓以及時間,篩選出最佳的參數,以得到雙層結構之陽極材料,最後再進行全電池組裝及測試。根據 XRD 與 TEM 結果顯示,單層 MN6-90 薄膜之結構為立方體 Ni,而雙層MN6-90/NiFe LDH-3c-5 薄膜則透過 Raman 光譜分析確認其外層結構為 NiFe-LDH。透過 SEM 觀察單層 MN6-90 薄膜之表面形貌可知其為微粒狀(Granular),而雙層MN6-90/NiFe LDH-3c-5 薄膜之表面形貌為奈米片狀(Nanosheet)。電化學量測結果顯示,在 1 M KOH 的氬氣環境下,單層 MN6-90 薄膜經 LSV 量測析氫反應在 10 mA/cm2 與 100 mA/cm2 電流密度時,過電位僅為 38 mV 與 140 mV,Tafel 斜率值為 49 mV/dec。而雙層 MN6-90/NiFe LDH-3c-5 薄膜經 LSV 量測析氧反應在 10 mA/cm2 與 100 mA/cm2 電流密度時,過電位為 214 mV 與 257 mV,Tafel 斜率值為 43 mV/dec。因此,我們將具有優異 HER 與 OER 性能之單層 MN6-90 薄膜與雙層MN6-90/NiFe LDH-3c-5 薄膜分別作為陰極與陽極,電解液為 1 M KOH,組裝成簡易電解槽。經量測整體水電解性能後,在 10 mA/cm2、100 mA/cm2 與 500 mA/cm2 電流密度時,其電池電壓僅需 1.47 V、1.65 V 與 1.93 V,其性能遠優於貴金屬電解槽,而透過長時間穩定性測試,結果也顯示我們所製備的薄膜具有優異的穩定性。最後,我們將電極尺寸由 1x1 cm2 放大為 4x4 cm2,組裝成鹼性交換膜電池堆。根據電化學量測結果顯示,在 1 M KOH 的環境下,MN6-90/NiFe LDH-3c-5(+)∥MN6-90(-)電池堆在 10 mA/cm2、100 mA/cm2與 250 mA/cm2 電流密度時,其電池電壓僅需 1.58 V、1.78 V 與 1.91 V。在一般商用電解液濃度 7 M KOH 時,在 10 mA/cm2、100 mA/cm2 與 250 mA/cm2 電流密度時,其電池電壓僅需 1.54 V、1.71 V 與 1.85 V。
This study successfully prepared a cathode with excellent HER performance in an alkaline solution and an anode with double-layer structure OER performance on nickel foam by magnetron radio frequency sputtering and electrodeposition techniques. In the experiment, the molybdenum-nickel bimetallic film was first sputtered on the nickel foam, and the optimal parameters were found by adjusting the molar ratio of the molybdenum-nickel target, sputtering power, and deposition time to obtain the best cathode material MN6-90. To obtain the anode material of the double-layer structure, nickel-iron layered double hydroxide (NiFe-LDH) was deposited on the MN6-90 sputtered film by electrodeposition technique, and the optimal parameters were screened out by adjusting the electrolyte concentration, voltage, and time of electrodeposition. Finally, carry out the full cell assembly and test. According to the results of XRD and TEM, the structure of the single-layer MN6-90 thin film is cubic Ni, while the structure of the MN6-90/NiFe LDH-3c-5 thin film was confirmed to be NiFe-LDH by Raman analysis. Observing the surface morphology of MN6-90 thin film through SEM shows that it is granular, while the surface morphology of MN6-90/NiFe LDH-3c-5 thin film is nanosheet. Electrochemical measurement results show that our MN6-90 thin film had a promising HER performance in alkaline solutions. The MN6-90 thin film had low overpotentials of 38 mV and 140 mV to reach the current density of 10 mA/cm2 and 100 mA/cm2 , respectively. The Tafel slope value is 49 mV/dec. The MN6-90/NiFe LDH-3c-5 film also had good OER overpotentials of 214 mV and 257 mV to reach the current density of 10 mA/cm2 and 100 mA/cm2 , respectively. The Tafel slope value is 43 mV/dec. Therefore, we used the single-layer MN6-90 thin film with excellent HER performance and the double-layer MN6-90/NiFe LDH-3c-5 film with excellent OER performance as the cathode and the anode, respectively. The electrolyte was 1 M KOH and assembled into a simple electrolyzer. After measuring the overall water splitting, the cell voltage only needs 1.47 V, 1.65 V, and 1.93 V to reach the current density of 10, 100, and 500 mA/cm2 , respectively. Our performance is far better than the noble metal electrolyzer. The long-term stability test results showed that our electrolyzer has excellent stability. Finally, we scaled the material size from 1x1 cm2 to 4x4 cm2 and assembled it into an alkaline exchange membrane water electrolysis stack cell of MN6-90/NiFe LDH-3c-5(+) ∥MN6-90(-). According to the electrochemical measurement results, the cell voltage in the 1 M KOH only needs 1.58 V, 1.78 V, and 1.91 V to reach the current density of 10, 100, and 250 mA/cm2 , respectively. When using a general commercial electrolyte with a concentration of 7 M KOH, the cell voltage only needs 1.54 V, 1.71 V, and 1.85 V to reach the current density of 10, 100, and 250 mA/cm2 , respectively.
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