| 학회 |
한국재료학회 |
| 학술대회 |
2021년 봄 (05/12 ~ 05/14, 광주 김대중컨벤션센터) |
| 권호 |
27권 1호 |
| 발표분야 |
E. 환경/센서 재료 분과 |
| 제목 |
Manipulating Wettability of Catalytic Surface for Improving Ammonia Production from Electrochemical Nitrogen Reduction |
| 초록 |
Electrochemical nitrogen reduction reaction (ENRR), direct photocatalytic, or electrocatalytic conversion of N2 with water molecules into NH3, is considered as promising alternative for the traditional Haber-Bosch process. In this work, we present a method for improving ENRR performance by controlling the wettability of surface of the catalyst, which suppresses hydrogen evolution reaction (HER) while facilitating N2 adsorption. Reduced-graphene oxide (rGO) catalyst with the hydrophobic surface property (C.A 59 °) was synthesized through a high-density atmospheric plasma deposition. Two other surfaces with hydrophilicity (C.A 15 °) and superhydrophobicity (C.A 150 °) were developed through additional argon plasma and heat treatment of as-deposited rGO, respectively. The ENRR results show that the ammonia yield and Faradaic efficiency tended to increase with increasing hydrophobicity. Electrochemical measurements reveal that superhydrophobic rGO achieves higher Faradaic efficiency (5.73 %) at - 0.1 V vs. RHE and higher NH3 yield (9.77 μg h-1 cm-2) at - 0.4 V vs. RHE in 0.1 M KOH electrolyte. These results affirm controlling the wettability of the catalytic surface is an effective strategy to improve ENRR performance by suppressing the HER. This study inspires the development of rGO electrocatalyst via surface wettability modification for boosting ammonia electrosynthesis without any additional framework. |
| 저자 |
김도훈, Khurshed Alam, 한미경, 조훈성, 심욱
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| 소속 |
전남대 |
| 키워드 |
<P>Electrochemical; Electrocatalyst; reduced-Graphene oxide; Ammonia; Nitrogen reduction; Energy conversion; Wettability</P>
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| E-Mail |
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