Journal of the Microelectronics and Packaging Society (마이크로전자및패키징학회지)

The Korean Microelectronics and Packaging Society (한국마이크로전자및패키징학회)
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Improvement of Electrochemical Reduction Characteristics of Carbon Dioxide at Porous Copper Electrode using Graphene

그래핀을 이용한 다공성 구리 전극의 전기화학적 이산화탄소 환원 능력 향상

  • Bang, Seung Wan (Department of Advanced Chemicals & Engineering, Chonnam National University) ;
  • Rho, Hokyun (Department of Advanced Chemicals & Engineering, Chonnam National University) ;
  • Bae, Hyojung (Optoelectronics Convergence Research Center, Chonnam National University) ;
  • Kang, Sung-Ju (Department of Advanced Chemicals & Engineering, Chonnam National University) ;
  • Ha, Jun-Seok (Department of Advanced Chemicals & Engineering, Chonnam National University)
  • 방승완 (전남대학교 화학공학부) ;
  • 노호균 (전남대학교 화학공학부) ;
  • 배효정 (전남대학교 광전자융합기술연구소) ;
  • 강성주 (전남대학교 화학공학부) ;
  • 하준석 (전남대학교 화학공학부)
  • Received : 2018.12.14
  • Accepted : 2018.12.24
  • Published : 2018.12.31
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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 $KHCO_3$ 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 $H_2$ were generated to Porous Cu electrode. On the other hand, the product of porous Cu/Graphene produced CO, $CH_4$ and $C_2H_4$. 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.

본 연구는 구리의 이산화탄소 환원 촉매 특성을 향상시키기 위해 전극 촉매 물질인 다공성 구리에 그래핀을 적용하였다. Thermal Chemical Vapor Deposition(TCVD)법을 이용하여 직접적으로 그래핀이 혼합된 다공성 구리를 제조하였다. 0.1 M $KHCO_3$ 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 $H_2$만 생성된 반면 그래핀이 포함된 다공성 구리의 생성물은 CO 뿐만이 아닌 $CH_4$와 $C_2H_4$가 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.

Keywords

MOKRBW_2018_v25n4_105_f0001.png 이미지

Fig. 2. 실온 조건에서 측정한 (a) PCu 샘플과 (b) PCuG 샘플의 Raman spectroscopy.

MOKRBW_2018_v25n4_105_f0002.png 이미지

Fig. 3. PCu 샘플과 PCuG 샘플의 Cyclic voltammetry(V vs. RHE).Scan rate 0.02 Vs−1.

MOKRBW_2018_v25n4_105_f0003.png 이미지

Fig. 1. (a) PCu과 (b) PCuG의 SEM morphology.

MOKRBW_2018_v25n4_105_f0004.png 이미지

Fig. 4. (a) PCu와 (b) PCuG의 -1.0 V ~ -1.4 V 전압에 따른 전기 화학적 이산화탄소 환원 기체 생성물 발생량(μmol/m3).

Table 1. PCu 샘플과 PCuG 샘플의 전기화학적 이산화탄소 환원 기체 생성물 발생량. (인가전압 −1.4 V vs. RHE).

MOKRBW_2018_v25n4_105_t0001.png 이미지

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