Chao Yunfeng, Ge Yu, Chen Zhiqi, Cui Xiaoling, Zhao Chen, Wang Caiyun, Wallace Gordon G
Intelligent Polymer Research Institute, ARC Centre of Excellence for Electromaterials Science, AIIM Facility, Innovation Campus, University of Wollongong, Wollongong, New South Wales 2522, Australia.
College of petrochemical technology, Lanzhou University of Technology, Lanzhou 730050, PR China.
ACS Appl Mater Interfaces. 2021 Feb 17;13(6):7285-7296. doi: 10.1021/acsami.0c21439. Epub 2021 Feb 2.
It is challenging to hydrothermally synthesize solution-processable MoS, as the strong van der Waals force between MoS nanosheets induces self-assembly of agglomerates. Here, we introduce poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) into the precursor to impede aggregate formation in the hydrothermal process. A hybrid MoS/PEDOT:PSS (MP) hydrogel is formed due to the electrostatic interactions between the negatively charged MoS and positively charged PEDOT chains. This hydrogel can be easily dispersed in water for subsequent solution processing such as vacuum filtration to form free-standing flexible films or extrusion 3D printing to create novel patterns. The MP film with a fracture strength of 18.59 MPa displays excellent electrochemical performance in both aqueous NaSO electrolyte (474 mF cm) and solid-state PVA-HPO electrolyte (360 mF cm). Flexibility and robustness can be evidenced by high capacitance retention rates of 94 and 89% after being repeatedly bent to 180° for 5000 cycles in aqueous and solid-state electrolytes, respectively.
水热合成可溶液加工的二硫化钼具有挑战性，因为二硫化钼纳米片之间强大的范德华力会导致团聚体的自组装。在此，我们将聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）引入前驱体中，以阻止水热过程中聚集体的形成。由于带负电荷的二硫化钼与带正电荷的PEDOT链之间的静电相互作用，形成了一种二硫化钼/聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（MP）混合水凝胶。这种水凝胶可以很容易地分散在水中，用于后续的溶液加工，如真空过滤以形成独立的柔性薄膜，或挤出3D打印以创建新颖的图案。断裂强度为18.59MPa的MP薄膜在水性硫酸钠电解质（474mF/cm²）和固态聚乙烯醇-磷酸电解液（360mF/cm²）中均表现出优异的电化学性能。在水性和固态电解质中分别反复弯曲至180°达5000次循环后，高电容保持率分别为94%和89%，这证明了其柔韧性和坚固性。
