TY - JOUR
T1 - N-doped C-CoS2@CoS2/MoS2 nano polyhedrons with hierarchical yolk-shelled structures as bifunctional catalysts for enhanced photovoltaics and hydrogen evolution
AU - Yang, Jiahui
AU - Zhang, Chao
AU - Niu, Yudi
AU - Huang, Jie
AU - Qian, Xing
AU - Wong, Kwok Yin
N1 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China (No.: 21702031) and the Natural Science Foundation of Fujian Province (No.: 2018J01692). We also thank the Hong Kong Scholars Program (No.: XJ2018023) for their support.
Funding Information:
This work was financially supported by the National Natural Science Foundation of China (No.: 21702031) and the Natural Science Foundation of Fujian Province (No.: 2018J01692). We also thank the Hong Kong Scholars Program (No.: XJ2018023) for their support.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/4/1
Y1 - 2021/4/1
N2 - The multicomponent composite nanomaterials with multilevel spatial structures have a broad application prospect in energy conversion. Herein, we rationally designed a novel strategy to synthesize hierarchical yolk-shelled N-doped carbon/CoS2/MoS2 nano polyhedrons (NC-CoS2@CoS2/MoS2 YSPs) as bifunctional catalysts for dye-sensitized solar cells (DSSCs) and hydrogen evolution reactions (HERs). NC-CoS2@CoS2/MoS2 YSPs were prepared by ion-exchange between zeolitic imidazolate framework-67 (ZIF-67) and (NH4)2MoS4 with a subsequent sulfuration reaction under an annealing treatment. Benefiting from the unique yolk-shelled architecture, the obtained NC-CoS2@CoS2/MoS2 YSPs had enough internal clearance for both accommodating electrolyte and loading abundant active sites. In addition, the introduction of N and C elements greatly improved the activity and electroconductibility of the catalysts. As a result, the DSSC based on NC-CoS2@CoS2/MoS2 YSPs exhibited a superior power conversion efficiency of 9.54%, which was apparently higher than that of Pt (8.19%). Furthermore, a low onset potential of 44.5 mV and a small Tafel slope of 64.6 mV dec–1 were achieved by this catalyst for HER in 0.5 M H2SO4. The present approach affords a new idea for the design of yolk-shelled nanomaterials and can be extended to synthesize other catalysts to substitute Pt-based materials in different energy conversion fields.
AB - The multicomponent composite nanomaterials with multilevel spatial structures have a broad application prospect in energy conversion. Herein, we rationally designed a novel strategy to synthesize hierarchical yolk-shelled N-doped carbon/CoS2/MoS2 nano polyhedrons (NC-CoS2@CoS2/MoS2 YSPs) as bifunctional catalysts for dye-sensitized solar cells (DSSCs) and hydrogen evolution reactions (HERs). NC-CoS2@CoS2/MoS2 YSPs were prepared by ion-exchange between zeolitic imidazolate framework-67 (ZIF-67) and (NH4)2MoS4 with a subsequent sulfuration reaction under an annealing treatment. Benefiting from the unique yolk-shelled architecture, the obtained NC-CoS2@CoS2/MoS2 YSPs had enough internal clearance for both accommodating electrolyte and loading abundant active sites. In addition, the introduction of N and C elements greatly improved the activity and electroconductibility of the catalysts. As a result, the DSSC based on NC-CoS2@CoS2/MoS2 YSPs exhibited a superior power conversion efficiency of 9.54%, which was apparently higher than that of Pt (8.19%). Furthermore, a low onset potential of 44.5 mV and a small Tafel slope of 64.6 mV dec–1 were achieved by this catalyst for HER in 0.5 M H2SO4. The present approach affords a new idea for the design of yolk-shelled nanomaterials and can be extended to synthesize other catalysts to substitute Pt-based materials in different energy conversion fields.
KW - Bifunctional electrocatalysts
KW - DSSCs
KW - HERs
KW - NC-CoS@CoS/MoS YSPs
KW - Transition metal sulfides
KW - Yolk-shelled structure
UR - http://www.scopus.com/inward/record.url?scp=85098689406&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2020.128293
DO - 10.1016/j.cej.2020.128293
M3 - Journal article
AN - SCOPUS:85098689406
SN - 1385-8947
VL - 409
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 128293
ER -