TY - JOUR
T1 - Flower-like Mo doped Ni(OH)2@Co3S4-Ni3S2 heterostructure for asymmetric supercapacitors
AU - Xu, Xiangyu
AU - Han, Jeong In
N1 - Publisher Copyright:
© 2022
PY - 2022/6
Y1 - 2022/6
N2 - The construction of heterostructures is a common means for obtaining new high-performance materials. On this basis, doping of metallic elements tends to achieve surprising expectations. Here, Ni(OH)2@Co3S4-Mo-Ni3S2 heterostructures were obtained by doping molybdenum into cobalt sulfide layers through a facile two-step hydrothermal synthesis method. Impressively, the doping of Mo also affected the Ni-O bond interaction, and this cross-component synergistic effect led to the generation of defects and triggered an overall improvement in the properties of the original Ni(OH)2@Co3S4-Ni3S2 material. The results showed that the specific surface area increased from 24.4 m2/g to 53.8 m2/g after Mo doping, and the Ni(OH)2@Co3S4-Mo-Ni3S2 electrode exhibited twice the specific capacitance (2869: 1360 F g–1 = 2.1) at a current of 2 A g–1. Likewise, after 5000 cycles, the capacitance retention of the Ni(OH)2@Co3S4-Mo-Ni3S2 electrode was 86.7%, better than the 82.5% before doping. To further explore its practicality, the Ni(OH)2@Co3S4-Mo-Ni3S2//AC ACS device was assembled, delivering a maximum energy density of 56.2 W h kg–1 at a power density of 213.4 W kg–1 and showing good cycling stability (91.2% capacitance retention after 5000 cycles). This work demonstrates that Mo doping for modification of heterostructures to further improve performance is a feasible and prospective approach.
AB - The construction of heterostructures is a common means for obtaining new high-performance materials. On this basis, doping of metallic elements tends to achieve surprising expectations. Here, Ni(OH)2@Co3S4-Mo-Ni3S2 heterostructures were obtained by doping molybdenum into cobalt sulfide layers through a facile two-step hydrothermal synthesis method. Impressively, the doping of Mo also affected the Ni-O bond interaction, and this cross-component synergistic effect led to the generation of defects and triggered an overall improvement in the properties of the original Ni(OH)2@Co3S4-Ni3S2 material. The results showed that the specific surface area increased from 24.4 m2/g to 53.8 m2/g after Mo doping, and the Ni(OH)2@Co3S4-Mo-Ni3S2 electrode exhibited twice the specific capacitance (2869: 1360 F g–1 = 2.1) at a current of 2 A g–1. Likewise, after 5000 cycles, the capacitance retention of the Ni(OH)2@Co3S4-Mo-Ni3S2 electrode was 86.7%, better than the 82.5% before doping. To further explore its practicality, the Ni(OH)2@Co3S4-Mo-Ni3S2//AC ACS device was assembled, delivering a maximum energy density of 56.2 W h kg–1 at a power density of 213.4 W kg–1 and showing good cycling stability (91.2% capacitance retention after 5000 cycles). This work demonstrates that Mo doping for modification of heterostructures to further improve performance is a feasible and prospective approach.
KW - Asymmetric supercapacitors
KW - Defects
KW - Heterostructures
KW - Mo doping
KW - Performance enhancement
UR - http://www.scopus.com/inward/record.url?scp=85127008155&partnerID=8YFLogxK
U2 - 10.1016/j.surfin.2022.101896
DO - 10.1016/j.surfin.2022.101896
M3 - Article
AN - SCOPUS:85127008155
SN - 2468-0230
VL - 30
JO - Surfaces and Interfaces
JF - Surfaces and Interfaces
M1 - 101896
ER -