N-doped graphene quantum dots as charge-transfer-bridge at LaSrCoO/MoSe2 heterointerfaces for enhanced water splitting
- Authors
- Cao, CT[Cao, Chen Tian]; Kim, SW[Kim, Sun-Woo]; Kim, HJ[Kim, Hee Jun]; Purbia, R[Purbia, Rahul]; Kim, SH[Kim, Sang Heon]; Kim, D[Kim, Dokyoung]; Choi, KJ[Choi, Kyoung Jin]; Park, H[Park, Hyesung]; Baik, JM[Baik, Jeong Min]
- Issue Date
- Jun-2022
- Publisher
- ELSEVIER
- Keywords
- Bifunctional electrocatalyst; Perovskite; < p> MoSe2< /p> ; Interfacial band alignment engineering; N -doped graphene quantum dots
- Citation
- NANO ENERGY, v.96
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO ENERGY
- Volume
- 96
- URI
- https://scholarworks.bwise.kr/skku/handle/2021.sw.skku/96860
- DOI
- 10.1016/j.nanoen.2022.107117
- ISSN
- 2211-2855
- Abstract
- ABSTR A C T A bifunctional electrocatalyst interface requires superior charge transfer and good electrical conductivity to produce a water splitting reaction that is overall efficient and stable. In the context of engineering the interfacial band alignment, we demonstrate a novel and straightforward approach to control the electrochemical activity of the bifunctional catalysts with precision by bridging conductive N-doped graphene quantum dots (N-GQDs, 2-3 nm) between La0.5Sr0.5CoO3-delta (LSC) and MoSe2 interfaces. The N-GQDs govern the charge transfer process at the interface, exhibiting higher Co3+ cations and metallic 1 T-MoSe2 phase-transition compared to those of LSC and LSC-MoSe2 composites. As a result, the optimized LSC-N-GQDs-MoSe2 electrocatalyst possessed a lower over -potential, Tafel slope, and charge transfer resistance in HER and OER than pure and LSC-MoSe2 electrocatalysts in an alkaline solution. The Tafel slopes (64 mV & BULL;dec(-1) and 51 mV & BULL;dec(-1) for HER and OER respectively) are smaller than those of current solutions that are commercially available, showing a higher performance at a high current density of 500 mA & BULL;cm(-2) with a long-term 24 h stability test. The key design of the current study is based on conductive bridging in the bifunctional catalyst to improve the interfacial charge transfer and electrochemical reaction.
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- Appears in
Collections - Engineering > School of Advanced Materials Science and Engineering > 1. Journal Articles
- Graduate School > Advanced Materials Science and Engineering > 1. Journal Articles
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