• 文献标题:   N-doped graphene quantum dots as charge-transfer-bridge at LaSrCoO/MoSe2 heterointerfaces for enhanced water splitting
  • 文献类型:   Article
  • 作  者:   CAO CT, KIM SW, KIM HJ, PURBIA R, KIM SH, KIM D, CHOI KJ, PARK H, BAIK JM
  • 作者关键词:   bifunctional electrocatalyst, perovskite, mose2, interfacial band alignment engineering, n doped graphene quantum dot
  • 出版物名称:   NANO ENERGY
  • ISSN:   2211-2855 EI 2211-3282
  • 通讯作者地址:  
  • 被引频次:   9
  • DOI:   10.1016/j.nanoen.2022.107117 EA MAR 2022
  • 出版年:   2022

▎ 摘  要

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.