亞硝基紅－鈷錯合物於電催化二氧化碳還原產甲醇之應用

黃詩晴 ； 王柏升 ； 翁薇婷 ； 林家裕

《化工》 67卷4期 (2020/08) Pp. 24-33

https://doi.org/10.29803/CE.202008_67(4).0004

摘要

本研究主要探討亞硝基紅鹽－鈷錯合物（簡稱鈷錯合物）在二氧化碳還原生產甲醇反應之電催化活性。結果發現二氧化碳生產甲醇之選擇性（法拉第效率）跟電極材料、施加過電位以及電解時間相關。在最佳條件下，此鈷錯合物在與氟摻雜透明導電基材搭配下，催化二氧化碳還原生產甲醇的法拉第效率可達72.56±3.26%，較鈷錯合物在普魯士藍修飾之白金電極高出許多。最後，此鈷錯合物藉由透過幾丁聚醣膜的正電性與鈷錯合物負電性之靜電力吸引將鈷錯合物吸附於幾丁聚醣膜內而達成固定化。結果發現，固定化並不影響鈷錯合物的電催化活性。

並列摘要

In this study, the electrocatalytic activity of the cobalt complex (Co-NRS) with sodium-1-nitroso-2-naphthol-3,6-disulphonate (NRS) as ligand towards CO_2 reduction into methanol have been thoroughly investigated. It is found that the selectivity of CO_2 reduction into methanol, in terms of Faraday efficiency, is highly dependent on the electrode substrate, applied overpotential, and electrolysis duration. Under optimal conditions, electrochemical CO_2 reduction by Co-NRS at FTO substrate at low applied overpotential results in a Faraday efficiency of 72.56 ± 3.26% for methanol production, outperforming benchmark value obtained at Prussian blue modified platinum electrode. Finally, Co-NRS has been immobilized, via electrostatic attraction between positively-charged chitosan film and negatively-charged Co-NRS, onto the chitosan and CNT-chitosan modified FTO electrode. The immobilized Co-NRS preserved the electrocatalytic activity of the free Co-NRS towards the reduction of CO_2.