| 학회 |
한국화학공학회 |
| 학술대회 |
2022년 봄 (04/20 ~ 04/23, 제주국제컨벤션센터) |
| 권호 |
28권 1호, p.540 |
| 발표분야 |
[주제 8] 에너지 저장 |
| 제목 |
Understanding the Chemomechanical Interaction between Pd Nanoparticles and Graphene Layers for Tuning Hydrogen Sorption Dynamics |
| 초록 |
A quantitative understanding of chemomechanical interactions between metal hydrides and host materials in nanocomposites plays a key role in optimizing hydrogen storage performance of a nanoconfined structure. However, it has not been clarified due to the difficulty in correlating specific structural determinants with hydriding thermodynamics. Here, Pd nanocrystals encapsulated by reduced graphene oxide (rGO) were chosen as an ideal platform, and the encapsulation effects–in terms of strain, chemical interaction, and nanosizing–on hydrogen sorption dynamics of Pd were analyzed. We find that both strain energy and chemical interaction imposed by rGO broaden the stability gap between hydrided and dehydrided Pd phase, predominating the intrinsic nanosizing responsible for narrowing the gap. These external confining effects are finally shown to increase the reaction enthalpy, suggesting that governing factors for hydrogen uptake and release differ with or without the encapsulant. Our results reveal that the thermodynamics of confined metal hydrides can be designed by tuning contributing factors independently. |
| 저자 |
고진석1, 김대호1, ShinYoung Kang2, Tae Wook Heo3, Brandon C. Wood2, 한승민3, 조은선2
|
| 소속 |
1KAIST, 2LLNL, 3USA |
| 키워드 |
재료(Materials) |
| E-Mail |
|
| 원문파일 |
초록 보기 |
