| 摘要: | 為因應氣候變遷，各國正積極發展綠色再生能源並尋求替代能源。氫氣
具備優異的儲能與運輸特性，因此也被廣泛視為極具潛力的能源載體。其中
以非化石燃料製得、全程無碳排的「綠氫」，更被認為是實現碳中和的關鍵
技術之一。
本研究中，自製AEMWE電極，選用非貴金屬Ni作為陽極觸媒， Pt作
為陰極觸媒，使用三種不同黏著劑(Binder)，透過改變陰陽極觸媒與Binder
的比例以及陰極的負載量，探討其對水電解效能的影響，並組裝陰離子交換
膜水電解器，研究低濃度電解質溶液 (氫氧化鉀溶液) 下的水電解特性，同
時也進行了尿素產氫得初步測試。
研究結果顯示，在70 ℃ 操作溫度下，有著最佳表現的Binder為PTFE，
而陽極的最佳觸媒與 Binder 比例則為 90:10 wt.%，陰極負載量則是 4
mg/cm2。在這些最佳的電極製備條件下，電解器在70°C操作溫度與1.0 M
KOH電解溶液條件之下，在電壓1.8V與2.0V時能分別達到2428.8 mA/cm²
與 4540.8 mA/cm²之高電流密度。而在較低陰極負載量 0.5 mg/cm2時，在
80°C 操作溫度與1.0 M KOH電解溶液等操作條件之下，電壓1.8V與2.0V
時分別達到2409.6 mA/cm²與4875.2 mA/cm² 之高電流密度，此優異性能已
達到國際再生能源總署（IRENA）針對AEMWE於2050年的目標：在操作
溫度80°C、電壓低於2V等條件下，實現電流密度超過2 A/cm² 的性能表
現。此外，本研究亦使用低濃度電解液(0.2MKOH)進行測試，在70 ℃ 操作
溫度、陰極負載量為0.5 mg/cm2等最佳電極製備條件下，能在電壓1.8V與
2.0V 時分別達到1348.80 mA/cm²與2988.80 mA/cm² 之優異電流密度。;In response to climate change, countries are actively developing green
renewable energy sources and seeking alternative energy solutions. Hydrogen,
due to its excellent energy storage and transportation characteristics, is widely
regarded as a promising energy carrier. Among these, "green hydrogen," produced
from non-fossil fuels with zero carbon emissions, is considered one of the key
technologies for achieving carbon neutrality.
In this study, homemade AEMWE (Anion Exchange Membrane Water
Electrolysis) electrodes were fabricated, with non-precious metal Ni used as the
anode catalyst and Pt as the cathode catalyst. Three different binders were
employed to explore the impact of varying the ratio of catalyst to binder at both
the anode and cathode, as well as the cathode loading, on the performance of water
electrolysis. Additionally, an anion exchange membrane electrolyzer was
assembled to investigate the water electrolysis characteristics under low
concentration electrolyte solutions (potassium hydroxide solution), while
preliminary hydrogen production tests using urea were also conducted.
The results showed that at an operating temperature of 70°C, the optimal
binder was PTFE. The best anode catalyst-to-binder ratio was 90:10 wt.%, and
the optimal cathode loading was 4 mg/cm². Under these optimal electrode
preparation conditions, the electrolyzer, when operated at 70°C with 1.0 M KOH
electrolyte solution, achieved high current densities of 2428.8 mA/cm² and 4540.8
mA/cm² at voltages of 1.8V and 2.0V, respectively. At a lower cathode loading of
0.5 mg/cm², under the same operating conditions of 80°C and 1.0 M KOH
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electrolyte solution, current densities of 2409.6 mA/cm² and 4875.2 mA/cm²
were achieved at voltages of 1.8V and 2.0V, respectively. These excellent
performances meet the International Renewable Energy Agency (IRENA) target
for AEMWE in 2050, which aims to achieve current densities over 2 A/cm² at an
operating temperature of 80°C and a voltage under 2V.
Moreover, the study also tested the performance with a low-concentration
electrolyte (0.2 M KOH). Under the optimal electrode preparation conditions at
70°C and a cathode loading of 0.5 mg/cm², the electrolyzer demonstrated
excellent current densities of 1348.80 mA/cm² and 2988.80 mA/cm² at voltages
of 1.8V and 2.0V, respectively. |
