그래핀을 이용한 다공성 구리 전극의 전기화학적 이산화탄소 환원 능력 향상
Improvement of Electrochemical Reduction Characteristics of Carbon Dioxide at Porous Copper Electrode using Graphene
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초록
본 연구는 구리의 이산화탄소 환원 촉매 특성을 향상시키기 위해 전극 촉매 물질인 다공성 구리에 그래핀을적용하였다. Thermal Chemical Vapor Deposition(TCVD)법을 이용하여 직접적으로 그래핀이 혼합된 다공성 구리를 제조하였다. 0.1 M KHCO3 전해액을 사용하여, −1.0 V ~ −1.4 V의 인가전위로 전기화학 실험을 수행한 결과, 그래핀이 혼합된 다공성 구리 전극의 전류 밀도는 다공성 구리에 비해 1.8 배 이상 증가하였다. 생성물을 평가한 결과, 다공성 구리 전극에서 CO와 H2만 생성된 반면 그래핀이 포함된 다공성 구리의 생성물은 CO 뿐만이 아닌 CH4와 C2H4가 생성되었다. 이는 그래핀으로 인해 이산화탄소 흡착 시간이 길어짐으로써 반응 중 생성된 중간체들이 전극 표면에 머무르는 시간이 길어졌으며, 결과적으로 C2 화합물 생성 반응까지 연속적으로 진행될 수 있었다고 판단된다.
Abstract
We studied graphene synthesis to porous Cu to improve the characteristics of carbon dioxide reduction of cu. Cu powders were formed through Thermal Chemical Vapor Deposition(TCVD) to Porous Cu/Graphene structures synthesized with graphene. As a result of electrochemical experiments using a 0.1 M KHCO3 electrolyte at an applied potential of −1.0 V to −1.4 V, the current density of Porous Cu/Graphene was 1.8 times higher than that of Porous Cu. As a result of evaluating the product, CO and H2 were generated to Porous Cu electrode. On the other hand, the product of porous Cu/Graphene produced CO, CH4 and C2H4. It is considered that the graphene causes longer carbon dioxide adsorption time, which means that the intermediates formed during the reaction remain on the electrode surface for a longer time. As a result, it can be concluded that the production reaction of the C2 compound could be continuously performed.
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