1T MoS₂/CoS₂ heterostructures enabling enhanced resistive switching behavior in sodium alginate-based flexible memristors

Abstract

As the demand for wearable electronics escalates, flexible resistive random-access memory has garnered significant attention owing to its excellent flexibility and data storage capability. In this study, 1T MoS2/CoS2 nanorods...

Interfacial Engineering of MoS2@CoS2 Heterostructure Electrocatalysts for Effective pH-Universal Hydrogen Evolution Reaction

“…The presence of O may be attributed to sample oxidation in air. , As shown in Figure b, the parent peaks of CoS 2 can be decomposed into three peaks: Co–S (located at 779.2 eV), Co–O (located at 782.1 eV), and their satellite peaks (located at 784.5 eV). Compared with the original CoS 2 , the Co–S and Co–O peaks in MoS 2 @CoS 2 shifted 0.2 and 1.0 eV toward lower binding energy, indicating that electrons were injected from MoS 2 to CoS 2 . ,, The weak peak of Co in the original CoS 2 may be related to surface oxidation. The 3d spectra of Mo in MoS 2 @CoS 2 and MoS 2 are presented in Figure c.…”

“…In-depth experiments and calculations were conducted to comprehensively explore the HER properties of these samples across the entire pH range. Electron paramagnetic resonance (EPR) measurements were conducted to examine the existence of the defects in MoS 2 , CoS 2 , , and MoS 2 @CoS 2 . As illustrated in Figure a, the MoS 2 @CoS 2 heterojunction exhibits the strongest EPR peak, while MoS 2 has a nearly negligible peak, the intensity of which is proportional to the defect content. , These defects could stem from the disordered structure creating active sulfur vacancies during the reaction. , Under almost identical preparation conditions, it is evident that the CoS 2 sample also has a notable sulfur vacancy peak, while the MoS 2 sample has an almost negligible peak.…”

“…The S 2p spectra of MoS 2 @CoS 2 and MoS 2 are presented in Figure d. The MoS 2 and MoS 2 @CoS 2 both exhibit doublet peaks at binding energies of 162.2 and 163.3 eV, corresponding to the S–S bridging divalent sulfide ions (S 2– ). , However, both CoS 2 and MoS 2 @CoS 2 samples exhibited the presence of SO 4 2– (169.2 eV), whereas no detectable peak of SO 4 2– was observed in the MoS 2 catalyst. It is hypothesized that the occurrence of CoSO 4 might contribute to the appearance of the SO 4 2– peak. , It can be observed that the peaks corresponding to S 2p in MoS 2 @CoS 2 exhibit a shift toward higher binding energies compared to pristine MoS 2 .…”