| 학회 |
한국화학공학회 |
| 학술대회 |
2018년 가을 (10/24 ~ 10/26, 대구 EXCO) |
| 권호 |
24권 2호, p.1524 |
| 발표분야 |
에너지 환경(Energy and Environment) |
| 제목 |
Sulfur on molybdenum carbide as an promoter for high efficient hydrogen evolution reaction |
| 초록 |
Due to the exergonic hydrogen binding energy property of Mo2C, weakening the binding energy facilitates HER performance by shifting the HER volcano position toward the top. Here, we hypothesized that the sulfur which is well known as fractious catalyst poison will be an long-lasting adsorbate on Mo2C and demonstrated the role of sulfur by using the density functional theory calculations. Interestingly, simulation result shows that the intermediate sulfur coverage (ΘS=0.50 or ΘS=0.75) leads an unfavorable hydrogen adsorption which makes energetic penalty resulting in decrease of hydrogen binding energy to reach an almost thermoneutral value. To support this theoretical results we designed sulfur doped Mo2C without destroying Mo2C crystal structure sucessfully. And thus synthesized sulfur doped Mo2C catalysts showed significant enhancement toward hydrogen generation having -91.88mV overpotential to achieve-10mA/cm2. The doped sulfur contributed to change the hydrogen binding energy by occupying original hydrogen adsorption site leading to unfavorable hydrogen adsorption instead. |
| 저자 |
김주예1, Per Lindgren2, Yin-Jia Zhang2, Kai Yan2, 김석기3, Andrew A. Peterson2, 정희태1
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| 소속 |
1한국과학기술원, 2Brown Univ., 3한국화학(연) |
| 키워드 |
에너지 환경 |
| E-Mail |
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| VOD |
VOD 보기 |
| 원문파일 |
초록 보기 |
