Abstract
Metallic molybdenum disulfide (MoS2), e.g., 1T phase, is touted as a highly promising material for energy storage that already displays a great capacitive performance. However, due to its tendency to aggregate and restack, it remains a formidable challenge to assemble a high-performance electrode without scrambling the intrinsic structure. Here, we report an electrohydrodynamic-assisted fabrication of 3D crumpled MoS2 (c-MoS2) and its formation of an additive-free stable ink for scalable inkjet printing. The 3D c-MoS2 powders exhibited a high concentration of metallic 1T phase and an ultrathin structure. The aggregation-resistant properties of the 3D crumpled particles endow the electrodes with open space for electrolyte ion transport. Importantly, we experimentally discovered and theoretically validated that 3D 1T c-MoS2 enables an extended electrochemical stable working potential range and enhanced capacitive performance in a bivalent magnesium-ion aqueous electrolyte. With reduced graphene oxide (rGO) as the positive electrode material, we inkjet-printed 96 rigid asymmetric micro-supercapacitors (AMSCs) on a 4-in. Si/SiO2 wafer and 100 flexible AMSCs on photo paper. These AMSCs exhibited a wide stable working voltage of 1.75 V and excellent capacitance retention of 96% over 20 000 cycles for a single device. Our work highlights the promise of 3D layered materials as well-dispersed functional materials for large-scale printed flexible energy storage devices.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 7308-7318 |
| Number of pages | 11 |
| Journal | ACS nano |
| Volume | 14 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2 2020 |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledgements: V.T. gratefully acknowledges the generous support in imaging characterizations from the Molecular Foundry (User Proposal #5067), Lawrence Berkeley National Lab, supported by the Office of Basic Energy Sciences of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. V.T. and J.-H.F. are indebted to the partial support from the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No: OSR2018-CARF/CCF-3079. Research reported in this publication was funded by the King Abdullah University of Science and Technology (KAUST) Catalysis Center. Y.S. is indebted to the
scientific illustrator, Heno Hwang at KAUST, for illustrating Figure 5a, and Shen Guang and Professor Ziping Lai for their assistance in interpretation of TEM results. R.B.K. thanks the Dr. Myung Ki Hong Endowed Chair in Materials Innovation at UCLA.