電化學硝酸根還原產氨反應（Nitrate reduction to ammonia, NRA）能在常溫下將廢水中的硝酸根（NO3-）轉化為氨（NH3），是近期備受矚目的催化反應。在NRA的反應過程須與氫氣（H2）和亞硝酸根（NO2-）的生成互相競爭。為此，以金屬銅（Cu）為主的相關的材料常做為NRA的電觸媒並且有著許多研究嘗試以不同載體提升NRA的催化效果，然而目前現有的研究中尚未針對不同載體（support）於相同反應條件下對「載體效應」於NRA催化效果的綜合影響進行討論。
為此本研究分別透過碳化不同種以銅為基底的金屬有機骨架（Metal–organic frameworks, MOFs）合成出以碳做為載體的CuOx/C、以ZrO2和碳為載體的CuZrOx/C以及以CeO2和碳做為載體的CuCeOx/C做為電觸媒並探討其催化效果。從結果可知在載體效應的幫助下，CuCeOx/C於-0.99 V vs. SHE、-1.09 V vs. SHE、-1.19 V vs. SHE及、-1.29 V vs. SHE四個電位下皆有著最佳的NH3法拉第效率且於轉化率（Turnover frequency, TOF）也可發現CuCeOx/C在較低的施加電位下有著最高的TOF（詳見本篇論文第三章）。由此可知以含有CeO2的碳做為載體可有效提升電催化產氨的選擇性。

Metal–organic framework (MOF)-derived copper supported by ceria/carbon, zirconia/carbon, and carbon are synthesized by thermally carbonizing a copper-installed cerium-based MOF, a copper-installed zirconium-based MOF, and a copper-based MOF constructed from the same organic building block, respectively. Modified electrodes of these electrocatalysts with the same areal loading of copper are prepared to investigate the effect of underlying supports on the resulting electrocatalytic activity of copper for the reduction of nitrate.
Electrolytic experiments with these modified electrodes are conducted in neutral aqueous solutions containing 0.5 M of nitrate at various applied potentials, and product analysis is performed. The overall reaction rate, Faradaic efficiency of each product, selectivity toward the production of ammonia against the formation of nitrite, and the turnover frequency for ammonia production normalized by the amount of electrochemically addressable copper sites are thus quantified at every electrolytic condition. The copper supported by ceria/carbon exhibits the highest selectivity toward ammonia production against the formation of nitrite among all the three materials; a selectivity of 73.4 % at -1.29 V vs. standard hydrogen electrode is achieved, which is much higher than those achieved by the zirconia/carbon-supported copper (36.0%) and carbon-supported copper (47.2%).
Density functional theory (DFT) computational studies are performed to probe the reason for such a difference in the electrocatalytic activity of copper caused by the underlying support. Findings here suggest the importance of selecting the underlying support upon the design of Cu-based electrocatalysts used for nitrate reduction.

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