| 학회 |
한국고분자학회 |
| 학술대회 |
2021년 가을 (10/20 ~ 10/22, 경주컨벤션센터) |
| 권호 |
46권 2호 |
| 발표분야 |
Virtual Lightning Session |
| 제목 |
Preparation and Properties of WS2/Co9S8 Core-shell Nanocrystals@Hollow-porous Carbon Fiber (HCF) for Water Electrolysis |
| 초록 |
Developing highly-efficiency, cost-effective, high-throughput and durable bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) is of paramount important for water electrolysis. Herein, we report an economical method for the synthesis of WS2, Co9S8 and WS2/Co9S8 nanocrystals with different diamension, structure and morphology grown on hollow-porous carbon fiber (HCF) via calcination and S vapor inducing reaction treatment as bifunctional catalysts for water electrolysis. Then, the effects of structure and morphology on the water electrolysis of WS2 and (or) Co9S8@hollow-porous carbon fiber (HCF) were investigated. The catalyst W1Co1S@HCF with W/Co molar ratio of 1:1 presented excellent HER activity for 228 ± 8.38 mV overpotential at a current density of 10 mA/cm2 with the Tafel slope of 111 mV/dec. More importantly, the W1Co1S@HCF had superior stability in acidic electrolyte solution. The catalyst W1Co3S@HCF with W/Co molar ratio of 1:3 gained excellent OER activity for 437 ± 19.47 mV overpotential at a current density of 10 mA/cm2 with the Tafel slope of 99 mV/dec. The excellent electrocatalytic actives can be attributed to the synergetic effects of appropriate molar ratio WS2/Co9S8 core-shell and hollow-porous structure in addition to providing more potential implantation sites. |
| 저자 |
Fei-fei Wang1, Ping Wang2, Ick Soo Kim1
|
| 소속 |
1Shinshu Univ., 2Soochow Univ. |
| 키워드 |
- |
| E-Mail |
|
