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Bifunctional Electrocatalyst with 0D/2D Heterostructure for Highly Efficient Hydrogen and Oxygen Generation
Author(s) -
Yu Xueping,
Yang Chan,
Zhang Shan,
Xing Yonglei,
Liu Chuntai,
Peng Juan,
Yan Qingyu
Publication year - 2020
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202000419
Subject(s) - electrocatalyst , bifunctional , oxygen , oxygen evolution , hydrogen , catalysis , materials science , chemistry , electrochemistry , electrode , biochemistry , organic chemistry
A novel MoS 2 quantum dots/CoSe 2 nanosheet (MoS 2 QDs/CoSe 2 ) hybrid with 0D/2D heterostructure has been developed. The CoSe 2 nanosheets (NSs) enable an excellent oxygen evolution reaction (OER) activity with increasing vacancy configuration on one hand, while the MoS 2 QDs serve as an eminent hydrogen evolution reaction (HER) catalyst on the other. By integrating MoS 2 QDs and CoSe 2 NSs, the hybrid exhibits excellent electrocatalytic performances in HER and OER. The unique 0D/2D hetero‐interface increases the exposed active sites and facilitates electron transfer, thereby boosting the electrocatalytic activity. Relatively low overpotentials of 82 mV and 280 mV are required to drive the current density of 10 mA/cm 2 for HER and OER, with corresponding Tafel slopes of 69 and 75 mV/dec, respectively. As such, this work provides an efficient yet simple approach to construct bifunctional electrocatalysts with enhanced activity and stability.