A facile synthesis scheme is employed to form NiMoO4/CoMoO4 nanorods. The as-prepared sample was characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), ...energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Electrochemical characterization of the sample was investigated by employing cyclic voltammetry (CV), galvanostatic charge and discharge (GCD) and electrochemical impedance spectroscopy (EIS). Our facilely synthesized NiMoO4/CoMoO4 nanorods utilizes the synergic effects of Ni and Co ternary molybdates which enabled a high specific capacitance of 1445 F/g to be achieved at a current density of 1 A/g and retained 78.8% of its initial capacitance after 3000 cycles at a current density of 10 A/g. The sample also exhibited a low ionic resistance of 1.20 Ω. This performance was much higher than individual NiMoO4 and CoMoO4 nanorods. The simple and scalable scheme employed to form the high performance NiMoO4/CoMoO4 nanorods makes it a significant low cost electrode material for supercapacitor application.
•Design of a facile synthesis scheme for NiMoO4/CoMoO4 nanorods.•Simple and environmental friendly scheme for NiMoO4/CoMoO4 synthesis.•Evaluation of the synergic effects of NiMoO4 and CoMoO4.•NiMoO4/CoMoO4 as a promising electrode material for supercapacitor application.
•Effect of different HTLs on the stability and performance of organic solar cells.•GO/PEDOT:PSS HTL shows an improvement in stability and PCE over bare GO or PEDOT:PSS.•The improvement is due to the ...bond formation at the interface of GO/PEDOT:PSS HTL.•The study is paving a way for a new technique to improve the stability of OSCs.
In this paper, we report on the use of molecular level interaction between a composite poly(3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT: PSS) and graphene oxide (GO) hole transport layer (HTL) to improve the long term stability and performance of poly(3-hexylthiophene): poly(3-hexylthiophene): 3′H-cyclopropa 8,25 5,6 fullerene-C60-D5h(6)-3′-butanoic acid 3′-phenyl methyl ester (P3HT: PCBM)-based bulk heterojunction organic solar cells (OSCs). The device employing this composite HTL demonstrated a maximum power conversion efficiency (PCE) of 4.82% with good reproducibility and retained over 30% of its initial PCE without encapsulation after 15 days under atmospheric conditions. This was a significant improvement compared with devices fabricated with either single GO or PEDOT: PSS HTLs, which retained only 26% and 0% of their initial PCE values of 3.16% and 4.00%, respectively. Hence, we imagine that this air resistant HTL composite will probably contribute significantly to the widespread commercialization of low cost and easily fabricated OSCs.
An aqueous potassium ion-based asymmetric supercapacitor has been successfully developed using nitrogen-doped porous carbon (NPC) derived from waste orange peel and sea urchin-like intercrossed and ...interconnected NiCo2O4 array on Ni foam for negative and positive electrodes, respectively. A negative electrode was designed using NPC developed via hydrothermal method. Subsequent KOH activation of waste orange peel resulted in NPC. Nitrogen doping increased the wettability, which enhanced its capacitance during electrochemical performance. NPC yielded a typical electrical double layer capacitor with a high capacitance of 268 F/g, and robust cyclic stability (92%) with up to 6000 cycles and good working potential (0 to −1 V) in an aqueous electrolyte. Hydrothermally synthesized sea urchin-like intercrossed and interlinked NiCo2O4@NF was used as a negative electrode with a high capacitance of 1300 F/g at a current density of 1 A/g and excellent rate as well as enhanced cyclic performance up to 3500 cycles. NiCo2O4//NPC-assembled asymmetric supercapacitor exhibited excellent life cycle with 100% capacitance retention up to 8000 cycles and delivered maximum energy density of 32.08 Wh/kg at a power density of 700.43 W/kg in a 2M KOH electrolyte. The enhanced performance of the negative electrode was attributed to higher porosity and doping in NPC, which facilitates the diffusion of electrolyte ions into the electroactive material during electrochemical performance. The unique porous morphology exposed a large number of surface electroactive sites to redox reactions and prevented phase damage caused by volume expansion and redox reactions during electrochemical activity resulting in enhanced performance of the positive electrode.
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•Waste orange peel recycled into nitrogen doped porous carbon (NPC) via hydrothermal method and subsequent KOH activation.•In recycled NPC, the increase of the wettability due to the nitrogen doping improved capacitance as an anode material.•Direct growth of intercrossed interlinked urchin-like NiCo2O4 prevents binder and conductive adhesion of electrode.•The morphology of NiCo2O4@NF provided large surface electroactive sites to achieve high specific capacitance of cathode.•Fabricated NiCo2O4//NPC asymmetric capacitor exhibited robust cyclic stability up to 8000 cycles.
The applications of solution-exfoliated graphene oxide (GO) as an electrical/electrochemical conductor require rational design–based approaches. Herein, we show that reduced GO nanosheets with highly ...ordered or nanoporous structures can be fabricated by treatment of graphite oxide (GrO) having variable-oxidation-degree with hot KOH solution. As model systems, GrO powders fabricated by modified Brodie and Hummers methods (B-GrO and H-GrO, respectively) were exfoliated into GO in alkaline solutions (to afford B-KGO and H-KGO, respectively), followed by 2.5-h refluxing at 100 °C. Notably, B-KGO was exceptionally resistant to hot KOH solution, whereas H-KGO was partially reduced under these conditions, as confirmed by 13C solid-state NMR, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy analyses. Moreover, reduced B-KGO featured highly ordered structures, whereas reduced H-KGO contained nanopores resulting from low-temperature activation in KOH solution. These extraordinary reactions of KGO nanosheets were translated into different electrical properties of reduced KGO nanosheets and different rheological properties of the corresponding pastes.
High-quality or highly porous graphene nanosheets were rationally fabricated by oxidation degree–dependent transformations of graphene oxide in hot alkaline solution. These reactions were translated into exceptionally different electrical properties of reduced graphene oxide nanosheets and the different rheological properties of the corresponding pastes. Display omitted
A detailed understanding of synergistic effects is very important for obtaining high-performance supercapacitor electrodes. A facile, swift and low-energy precipitation route has been employed to ...design CuMoO
4
/ZnMoO
4
nanoflower arrays and subsequently explore their structural and electronic characteristics. Remarkably, CuMoO
4
/ZnMoO
4
-based supercapacitor exhibited superior specific capacitance of 840 F/g compared to 203 F/g and 460 F/g for CuMoO
4
and ZnMoO
4
, respectively, at 2 A/g. The composite showed a remarkable long cycle lifetime with a cycling efficiency of 93.8 % after 5000 cycles. Moreover, an asymmetric CuMoO
4
/ZnMoO
4
//AC supercapacitor with a voltage of 1.5 V delivered a specific capacitance of 186 F/g at 1.5 A/g, specific energy of 34.8 Wh/kg at specific power of 472 W/kg and retained approximately 90% of the original capacitance after 8000 cycles. The outstanding supercapacitive performance is ascribed to the unique nanoflower design, low solution resistance of 0.28 Ω, and the synergy from the single components.
•Simple fabrication technique approached for hybrid solar cells (O-IHSCs).•The interface of G-PEDOT:PSS composite HTL chemically functionalized.•It enhances the electrical conductivity of G-PEDOT:PSS ...~ 1 million (S/m).•G-PEDOT:PSS composite HTL based O-IHSCs exhibit 3.90% of PCE.•This Si/P3HT:PCBM/G-PEDOT:PSS interfaces may be recommended for commercial O-IHSCs.
In this study, in order to minimize the recombination current of free charge carriers in a large-area organic-inorganic hybrid solar cell (O-IHSCs), we improved the electrical conductivity of a graphene (G) and poly(3,4-ethylenedioxy thiophene)–poly(styrenesulfonate) (G-PEDOT:PSS) hole transport layer (HTL) by introducing various concentrations of synthesized graphene (G) into poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The electrical conductivity of G-PEDOT:PSS was enhanced to 932781.17 S m−1 via the addition of 2 mg/mL of G to PEDOT:PSS. The O-IHSCs fabricated with the highly conductive G-PEDOT:PSS composite as HTL enhanced the power conversion efficiency (PCE) to 3.90%, a 70% increase compared to O-IHSCs fabricated with pristine PEDOT:PSS HTL. However, the accumulation of G at a higher concentration (2.5 mg/mL) degrades the performance of the solar cell, which generated further defects or film aggregation, interfering with the fast transport of free charge carriers toward their respective electrodes. The G-PEDOT:PSS composite contained various types of functionalization via interfacial reaction between the G and PEDOT:PSS based on Raman and X-ray photoelectron spectroscopy studies. These chemical functionalizations provide an additional mechanism of charge transport via bridges enhancing the carrier mobility and suppression of recombination of free charge carriers, resulting in significant improvement in photovoltaic performance of the O-IHSCs.
In this study, we have reported a facile fabrication of pristine zinc sulfide (ZnS), manganese sulfide (MnS), and ZnS/MnS nanocomposites (NCs) via cost-effective chemical precipitation method for ...electrochemical supercapacitor applications. The XRD, HR-TEM, and XPS analyses confirm the formation of ZnS/MnS NCs in the synthesized product. The electrochemical properties of ZnS/MnS NC electrode showed high specific capacitance of 884 F g
−1
at a scan rate of 2 mV s
−1
. Besides, we have fabricated a symmetric supercapacitor using ZnS/MnS NCsǁZnS/MnS NCs which exhibited a maximum energy density of 91 Wh kg
−1
at a power density of 7.78 kW kg
−1
with stable capacitance retention after 5000 cycles. Thus, the synergetic effect generated from the wurtzite-type hexagonal structure of ZnS/MnS leads to superior electron/ion transfer resulting in the enhanced electrochemical performance of the ZnS/MnS NCs which might be an ideal choice for cost-effective, high-performance supercapacitor applications.
Graphical abstract
ZnS/MnS NC electrodes for supercapacitor application
•An easily and one-step solvothermal approach applied for the synthesis of hierarchical flower-like nickel sulfide (NiS).•Addition of sulfur source with varies concentration significantly influenced ...the morphology of the NiS.•The as-synthesized NiS has used as an anode interfacial layer for OSCs.•The NiS_2.0 (NiS doped with 2.0 g of thioacetamide) based device achieved high efficiency than NiS_1.0, NiS_1.5, and NiS_2.5 based devices.•OSCs based on NiS_2.0 demonstrated the best reproducibility as well as long-term environmental stability performances.
In this work, nickel sulfide (NiS) with a mesoporous network was prepared through a simple solvothermal approach. The influences of various contents of the sulfur source on the morphological changes were examined. Finally, the resultant NiS doped with various contents of sulfur were used as hole-transport layers (HTLs) for the application to organic solar cells (OSCs). Based on our knowledge of the implementation of OSCs, NiS-based HTLs are used for the first time in this paper. The OSCs developed with NiS_2.0 (NiS doped with 2.0 g of thioacetamide (sulfur source)) HTL showed a higher PCE response, at 2.28% than those fabricated with NiS_1.0 (NiS doped with 1.0 g of thioacetamide), NiS_1.5, (NiS doped with 1.5 g of thioacetamide), and NiS_2.5 (NiS doped with 2.5 g of thioacetamide), which only showed 1.38%, 1.88%, and 1.96%, respectively. Besides this improved photovoltaic response, it also demonstrated a superior reproducibility with a high degree of control over the environmental stability, i.e., 360 h, as compared to the bare PEDOT:PSS HTL-based OSCs, which showed just 240 h.
Background and Aims
Currently there is no Food and Drug Administration–approved drug to treat NAFLD and NASH, the rates of which are increasing worldwide. Although NAFLD/NASH are highly complex and ...heterogeneous conditions, most pharmacotherapy pipelines focus on a single mechanistic target. Considering the importance of the gut‐liver axis in their pathogenesis, we investigated the therapeutic effect of a long‐acting dual agonist of glucagon‐like peptide (GLP)‐1 and GLP‐2 receptors in mice with NAFLD/NASH.
Approach and Results
C57BL/6J mice were fed a choline‐deficient high‐fat diet/high fructose and sucrose solution. After 16 weeks, mice were randomly allocated to receive vehicle, GLP1‐Fc, GLP2‐Fc, or GLP1/2‐Fc fusion (GLP1/2‐Fc) subcutaneously every 2 days for 4 weeks. Body weight was monitored, insulin/glucose tolerance tests were performed, feces were collected, and microbiome profiles were analyzed. Immobilized cell systems were used to evaluate direct peptide effect. Immunohistochemistry, quantitative PCR, immunoblot analysis, tunnel assay, and biochemical assays were performed to assess drug effects on inflammation, hepatic fibrosis, cell death, and intestinal structures. The mice had well‐developed NASH phenotypes. GLP1/2‐Fc reduced body weight, glucose levels, hepatic triglyceride levels, and cellular apoptosis. It improved liver fibrosis, insulin sensitivity, and intestinal tight junctions, and increased microvillus height, crypt depth, and goblet cells of intestine compared with a vehicle group. Similar effects of GLP1/2‐Fc were found in in vitro cell systems. GLP1/2‐Fc also changed microbiome profiles. We applied fecal microbiota transplantation (FMT) gain further insight into the mechanism of GLP1/2‐Fc–mediated protection. We confirmed that FMT exerted an additive effect on GLP1‐Fc group, including the body weight change, liver weight, hepatic fat accumulation, inflammation, and hepatic fibrosis.
Conclusions
A long‐acting dual agonist of GLP‐1 and GLP‐2 receptors is a promising therapeutic strategy to treat NAFLD/NASH.
Hybrid CeO
2
/Fe
2
O
3
composite nanospindles (CNSs) are synthesized by a simple and cost effective co-precipitation method. CeO
2
/Fe
2
O
3
CNSs used as an efficient recyclable photocatalyst for ...degrading Eosin Yellow (EY) dye under visible light irradiation possess a high degradation rate of 98% after 25 min. The estimated electrical energy efficiency of CeO
2
/Fe
2
O
3
CNSs shows the consumption of less energy (6.588 kW h m
−3
per order) in degrading EY. Besides, the CeO
2
/Fe
2
O
3
CNS exhibits a specific capacitance of 142.6 F g
−1
at a scan rate of 5 mV s
−1
. Moreover, the composite displays an excellent capacitance retention of 94.8% after 1000 cycles. This newly designed CeO
2
/Fe
2
O
3
CNS with enhanced visible light-driven photocatalytic activity and good supercapacitive cycling stability has great potential for use in wastewater treatment and energy storage applications.
Hybrid CeO
2
/Fe
2
O
3
composite nanospindles (CNSs) are synthesized by a simple and cost effective co-precipitation method, utilized for wastewater treatment and energy storage applications.
