| 학회 |
한국재료학회 |
| 학술대회 |
2021년 봄 (05/12 ~ 05/14, 광주 김대중컨벤션센터) |
| 권호 |
27권 1호 |
| 발표분야 |
C. 에너지 재료 분과 |
| 제목 |
Colloidal Ni2P Nanocrystals Encapsulated in Heteroatom-Doped Graphene Nanosheets: A Synergy of 0D@2D Heterostructure Towards Overall Water Splitting |
| 초록 |
Transition metal phosphides (TMPs) nanostructures have been extensively studied for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). However, a phase-controlled synthesis of colloidal Ni2P nanocrystals (NCs) or related heterostructures remains challenging and their use as a bifunctional electrocatalysts in overall water splitting (OWS) is not systematically studied. Herein, zero-dimensional (0D) colloidal Ni2P NCs are synthesized using a robust solution-phase method and encapsulated in two-dimensional (2D) N- and S-doped graphene (NSG) nanosheets via a facile ex-situ sonication to form 0D@2D Ni2P@NSG heterostructure. The interaction between the surface functionalities of Ni2P NCs and defective NSG via the strong van der Waals force provides a robust sheath to Ni2P NCs when encapsulated in NSG nanosheets, further enhancing the specific surface area and active sites exposure. Density functional theory calculations indicate that the dual interaction of N, and S dopants with the Ni2P benefits the coordinative effect of the optimized water and hydrogen free energy adsorption. As a result, Ni2P@NSG electrocatalysts manifest high catalytic activity towards HER and OER, and a two-electrode alkaline electrolyzer assembled by Ni2P@NSG as both anode and cathode requires only 1.572 V to reach current density at 10 mA/cm2. |
| 저자 |
Umesh Suryawanshi, Kim Jin Hyeok
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| 소속 |
Chonnam National Univ. |
| 키워드 |
0D@2D heterostructure; Ni<SUB>2</SUB>P nanocrystals; heteroatom-doped graphene; nanosheets; overall water splitting
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| E-Mail |
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