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Molybdenum disulfide (MoS 2 ) and polyaniline (PANI) electrodes were decorated with multi-walled carbon nanotubes (MWCNTs) on the basis of a facial hydrothermal and in situ polymerization methods and served in the asymmetric supercapacitor (ASC). The MoS 2 and MWCNTs with a mole ratio of 1:1 in MoS 2 |MWCNTs electrode exhibited better electrochemical properties through extensive electrochemical studies, in terms of the highest specific capacitance of 255.8 F/g at 1 A/g, low internal resistance, and notable electrochemical stability with retention of the initial specific capacitance at 91.6% after 1000 cycles. The as-prepared PANI|MWCNTs electrode also exhibited good specific capacitance of 267.5 F/g at 1 A/g and remained 97.9% capacitance retention after 1000 cycles. Then, the ASC with MoS 2 |MWCNTs and PANI|MWCNTs composite electrodes were assembled with polyvinyl alcohol (PVA)-Na 2 SO 4 gel electrolyte, which displayed good electrochemical performance with the specific capacitance of 138.1 F/g at 1 A/g, and remained the energy density of 15.09 Wh/kg at a high power density of 2217.95 W/kg. This result shows that this ASC device possesses excellent electrochemical properties of high energy density and power output and thus showing a potential application prospect.

The development of low‐cost, green, and pollution‐free counter electrode materials with high catalytic activity plays a critical role in improving the photovoltaic performance of dye‐sensitized solar cells (DSSCs). In recent years, transition metal phosphides have been widely used in DSSCs due to their outstanding catalytic activity and stability. Herein, a novel binary phosphide is immobilized on carbon paper (CP) by a two‐step strategy. This strategy involves the preparation of WO3 precursor by the hydrothermal method, and synthesis of tungsten phosphide (WP) with the vapor deposition method, which finally leads to the uniform dispersion of WP on carbon paper. The acquired WP/CP counter electrode demonstrates high electrical conductivity and prefect catalytic ability for reducing triiodide, and the DSSCs assembled with WP/CP counter electrode achieve a high‐power conversion efficiency of 10.29%, which is superior to that of the Pt‐based (7.34%). These findings illustrate that the WP microsheets in‐situ grown on carbon paper are a potential candidate to replace Pt as an economical and efficient counter electrode for DSSCs. A counter electrode (CE) of anchor tungsten phosphide (WP) onto carbon fibers of carbon paper (CP) is designed to form a heterojunction structure and served as CE for DSSCs, and exhibits much higher photovoltaic performance of DSSC with WP/CP‐3 CE (10.29%) than that of the Pt configuration device (7.34%).

A dye-sensitized and flexible TiO 2 fiber with multilayer structure was prepared by using brush method as the photoanode in the efficient flexible fibrous dye-sensitized solar cells (FFDSSCs) to avoid electronic recombination and improve the electronic capture efficiency. The composite Pt counter electrode, preparation from the surface modification of the electrodeposited Pt wire by using a simple one-step thermal decomposition approach of H 2 PtCl 6 isopropanol and n-butyl alcohol (volume ratio = 1:1) solution, provided a significant improvement in electrocatalytic activity, which was confirmed by extensive electrochemical tests. The FFDSSC assembled with the fiber-shaped TiO 2 photoanode and the composite Pt counter electrode achieves an enhanced photoelectric conversion efficiency of 6.35%, higher than that of the FFDSSC with monolayer fibrous TiO 2 photoanode and electrodeposited Pt wire counter electrode. More importantly, the photoelectric conversion efficiency of 6.35% is comparable to that of the FFDSSC based on the pure Pt wire counter electrode (6.32%). The FFDSSC with high elasticity, flexibility, and stretchability can adapt to complex mechanical deformations, which is of great significance for the development of wearable electronics in the future.

Over the past decade, the extensive consumption of finite energy resources has caused severe environmental pollution. Meanwhile, the promotion of renewable energy sources is limited by their intermittent and regional nature. Thus, developing effective energy storage and conversion technologies and devices holds considerable importance. Zinc‐ion hybrid supercapacitors (ZISCs) merge the beneficial aspects of both supercapacitors and batteries, rendering them an exceptionally promising energy storage method. As an important cathode material for ZISCs, the tunnel structure MnO2 has poor conductivity and structural stability. Herein, the ZnxMnO2/PPy (ZMOP) electrode materials are prepared by hydrothermal method. Doping with Zn2+ is used to enhance its structural stability, while adding polypyrrole to improve its conductivity. Therefore, the fabricated ZMOP cathode presents superb specific capacity (0.1 A g−1, 156.4 mAh g−1) and remarkable cycle performance (82.6%, 5000 cycles, 0.2 A g−1). Furthermore, the assembled aqueous ZISCs with ZMOP cathode and PPy‐derived porous carbon nanotube anode obtain a superb capacity of 109 F g−1 at 0.1 A g−1. Meanwhile, at a power density of 867 W kg−1, the corresponding energy density can achieve 20 Wh kg−1. And over 5000 cycles at 0.2 A g−1, the cycle performance of ZISCs maintains at 86.4%, which exhibits excellent cycle stability. This suggests that ZMOP nanowires are potential cathode materials for superior‐performance aqueous ZISCs. The KMnO4, Zn(NO3)2, and PPy served as the primary raw materials for the ZnxMnO2/PPy cathode. Following a hydrothermal reaction at 140°C for 3.5 h and subsequent drying in a vacuum drying oven at 70°C, the final nanowire structure was successfully synthesized.

Molybdenum disulfide (MoS ) and polyaniline (PANI) electrodes were decorated with multi-walled carbon nanotubes (MWCNTs) on the basis of a facial hydrothermal and in situ polymerization methods and served in the asymmetric supercapacitor (ASC). The MoS and MWCNTs with a mole ratio of 1:1 in MoS |MWCNTs electrode exhibited better electrochemical properties through extensive electrochemical studies, in terms of the highest specific capacitance of 255.8 F/g at 1 A/g, low internal resistance, and notable electrochemical stability with retention of the initial specific capacitance at 91.6% after 1000 cycles. The as-prepared PANI|MWCNTs electrode also exhibited good specific capacitance of 267.5 F/g at 1 A/g and remained 97.9% capacitance retention after 1000 cycles. Then, the ASC with MoS |MWCNTs and PANI|MWCNTs composite electrodes were assembled with polyvinyl alcohol (PVA)-Na SO gel electrolyte, which displayed good electrochemical performance with the specific capacitance of 138.1 F/g at 1 A/g, and remained the energy density of 15.09 Wh/kg at a high power density of 2217.95 W/kg. This result shows that this ASC device possesses excellent electrochemical properties of high energy density and power output and thus showing a potential application prospect.

Over the past decade, the extensive consumption of finite energy resources has caused severe environmental pollution. Meanwhile, the promotion of renewable energy sources is limited by their intermittent and regional nature. Thus, developing effective energy storage and conversion technologies and devices holds considerable importance. Zinc‐ion hybrid supercapacitors (ZISCs) merge the beneficial aspects of both supercapacitors and batteries, rendering them an exceptionally promising energy storage method. As an important cathode material for ZISCs, the tunnel structure MnO 2 has poor conductivity and structural stability. Herein, the Zn x MnO 2 /PPy (ZMOP) electrode materials are prepared by hydrothermal method. Doping with Zn 2+ is used to enhance its structural stability, while adding polypyrrole to improve its conductivity. Therefore, the fabricated ZMOP cathode presents superb specific capacity (0.1 A g −1 , 156.4 mAh g −1 ) and remarkable cycle performance (82.6%, 5000 cycles, 0.2 A g −1 ). Furthermore, the assembled aqueous ZISCs with ZMOP cathode and PPy‐derived porous carbon nanotube anode obtain a superb capacity of 109 F g −1 at 0.1 A g −1 . Meanwhile, at a power density of 867 W kg −1 , the corresponding energy density can achieve 20 Wh kg −1 . And over 5000 cycles at 0.2 A g −1 , the cycle performance of ZISCs maintains at 86.4%, which exhibits excellent cycle stability. This suggests that ZMOP nanowires are potential cathode materials for superior‐performance aqueous ZISCs.

A thin NiO layer (∼164 nm in thickness) is fabricated on the surface of TiO2 photoanode by a simple hydrothermal method. The TiO2/NiO photoanode prepared on the hydrothermal temperature of 100 °C (TiO2/NiO-100) shows enhancement of light-harvesting ability and excellent dye adsorption amount. Moreover, the intensity-modulated photovoltage spectroscopy, intensity-modulated photocurrent spectroscopy and electrochemical impedance spectroscopy measurements illustrate that the NiO layer makes the dye-sensitized solar cells (DSSCs) with TiO2/NiO photoanodes shorten electron transport time, lengthen electron lifetime and obtain a higher charge collection efficiency than that of DSSCs with TiO2 photoanodes. Hence, the TiO2/NiO photoanode can efficiently decrease the electron transport resistance and charge recombination action. The DSSCs with TiO2/NiO-100 have an improvement photovoltaic performance and can obtain a higher value of power conversion efficiency (8.93 ± 0.34%) than that of DSSCs with TiO2 photoanodes (8.17 ± 0.33%) under full sunlight illumination (100 mW cm−2, AM 1.5 G).

The polypyrrole (PPy) electrode is synthesized by chemical oxidative polymerization on fluorine-doped tin oxide glass. Then the ferrous sulfide (FeS) nanoparticles is formed during the PPy nanoparticles by immersing the PPy electrodes in fresh Na 2 S methanol solution (0.1 M) for 20 min. The synergistic effect of PPy and FeS nanoparticles make PPy/FeS CE possesses perfect transparency, good conductivity and excellent electrocatalytic activity for the reduction of triiodide/iodide. This would be attributed to improve the contact between counter electrode and electrolyte and enhance the collection and transmission of electrons. The transparent and high-efficiency PPy/FeS CE appears to be a potential candidate to the high cost and corrodible Pt CE of DSSCs. The dye-sensitized solar cells (DSSCs) based on PPy/FeS electrode can obtain a higher power conversion efficiency (PCE) of 7.48 % than that of DSSCs with pure PPy electrode (6.45 %) or Pt electrode (7.10 %) under full sunlight illumination (100 mW cm −2 , AM 1.5 G). Furthermore, the DSSC based on PPy/FeS electrode would obtain a high value of PCE (5.72 %) with back illumination.

A petal-like cobalt selenide nanosheets (Co 0.85 Se) is prepared by hydrothermal method and used as an efficient Pt-free counter electrode (CE) for dye-sensitized solar cells (DSSCs). Field emission scanning electron microscopy observes that the petal-like Co 0.85 Se possess porous and large specific surface area, which benefits the enhancement of electrocatalytic activity. Cyclic voltammogram measurement indicates that Co 0.85 Se electrode has larger current density than Pt electrode. Electrochemical impedance spectroscopy shows that the Co 0.85 Se electrode with optimal condition has low charge-transfer resistance of 0.79 Ω cm 2 . Under simulated solar light irradiation with intensity of 100 mW cm −2 (AM 1.5), the DSSC based on the Co 0.85 Se CE achieves a power conversion efficiency of 8.00 %, which is slightly higher than the solar cell based on the Pt CE (7.83 %).

Although the kagome model is fundamentally two-dimensional, the essential kagome physics, i.e ., the kagome-bands-driven emergent electronic states, has yet to be explored in the monolayer limit. Here, we present the experimental realization of kagome physics in monolayer Mo 33 Te 56 , showcasing both ferromagnetic ordering and a correlated insulating state with an energy gap of up to 15 meV. Using a combination of scanning tunnelling microscopy and theoretical calculations, we find a structural phase of the monolayer Mo-Te compound, which forms a mirror-twin boundary loop superlattice exhibiting kagome geometry and multiple sets of kagome bands. The partial occupancy of these nearly flat bands results in Fermi surface instability, counteracted by the emergence of ferromagnetic order (with a coercive field ~0.1 T, as observed by spin-polarized STM) and the opening of a correlated hard gap. Our work establishes a robust framework featuring well-defined atomic and band structures, alongside the intrinsic two-dimensional nature, essential for the rigorous examination of kagome physics. The kagome lattice is known to host a rich array of correlated phenomena, but thus far the number of examples of truly two dimensional kagome systems are limited. Here, Pan, Xiong, Dai, Zhang, and coauthors present a two-dimensional Mo-Te compound with a kagome superlattice structure, and multiple kagome bands driven correlated states.