Emerging energy applications of two-dimensional layered transition metal dichalcogenides

Wearable energy sources are in urgent demand due to the rapid development of wearable electronics. Besides flexibility and ultrathin thickness, emerging 2D materials present certain extraordinary properties that surpass the properties of conventional materials, which make them advantageous for high-performance wearable energy sources. Here, we provide a comprehensive review of recent advances in 2D material based wearable energy sources including wearable batteries, supercapacitors, and different types of energy harvesters. The crucial roles of 2D materials in the wearable energy sources are highlighted. Based on the current progress, the existing challenges and future prospects are outlined and discussed.

Wearable energy sources based on 2D materials

Recent advances in MoS2 nanostructured materials for energy and environmental applications – A Review

Dye-sensitized solar cells (DSSCs) are gaining considerable interest as alternatives to semiconductor-based thin film solar cells The noble metal platinum (Pt) is conventionally used as a counter electrode (CE) material for fabricating DSSCs, since Pt is expensive and scarce, therefore, new materials have been explored to develop cost-effective Pt-free counter electrodes Two-dimensional (2D) graphene-based counter electrodes have achieved the highest power conversion efficiency (PCE, η) of 13%, which has stimulated research activities in 2D layered transition metal dichalcogenides (TMDs) for developing Pt-free DSSCs In this review, progress made on alternative counter electrodes for fabricating low-cost Pt-free DSSCs, based on earth-abundant 2D TMDs including MoS2, WS2, TiS2, FeS2, CoS2, NiS2, SnS2, MoSe2, NbSe2, TaSe2, NiSe2, FeSe2, CoSe2, Bi2Se3 and their based composites, are discussed and summarized Also, the considerable progress made on thin films of MoS2 and MoS2 based carbon, graphene, carbon nanotubes (CNTs), carbon nanofibers (CNFs), and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composites as efficient counter electrodes (CEs) for DSSCs are discussed, in terms of their electrochemical and photovoltaic properties At present, PCE values higher than that of standard Pt CE have been recorded for a number of TMD-based CEs, which include MoS2 and MoSe2/thin films deposited on Mo foil, MoS2/CNTs, MoS2/graphene, MoS2/carbon, MoSe2/PEDOT:PSS, NbSe2, FeS2, FeSe2 nanosheets, TiS2/graphene, and NiS2/graphene hybrid systems in DSSCs, for the reduction of triiodide (I3−) to iodide (I−) The highest PCE (η = 1046%) versus Pt CE (η = 825%) at 1 Sun (100 mW cm−2, AM 15G) was measured for DSSCs having a low cost and flexible CoSe2/carbon-nanoclimbing wall counter electrode deposited on a nickel foam Though TMD-based materials show great potential for solar cell devices, their long-term stability is equally important The DSSCs with a TiS2/graphene hybrid, and TiS2/PEDOT:PSS composite CEs, showed stability up to 20 to 30 days, respectively, without any measurable degradation in the photovoltaic performance The long-term stability of TMDs-based DSSCs under different environmental conditions is also described in view of their commercial applications

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Two-dimensional transition metal dichalcogenide-based counter electrodes for dye-sensitized solar cells

ABO3-type perovskites (A = La, Ce, Sm; B = Cr, Mn, Fe, Co, Ni) were systematically fabricated via a facile soft-templated sol-gel with post-calcination method through a complexation-carbonation-oxidation process, which were successfully applied in the visible-light-driven photothermocatalytic degradation of volatile organic compounds (VOCs) for the first time. Preliminary characterization results revealed the lower impact to the oxidative performance and visible-light-absorption properties of ANiO3 than LaBO3, while the latter ones should present more attractive promotion of catalytic performance toward VOC degradation. Subsequently catalytic degradation of VOCs using gaseous styrene as model compound confirmed that all LaBO3-type perovskites possessed both high visible-light-driven photocatalytic and temperature-induced thermocatalytic activities. Meanwhile, synergetic effect between photocatalysis and thermocatalysis activities of different position B substituted LaBO3 resulted in different enhancement of their photothermocatalytic activities, where the highest synergistic factor (3.53) was obtained for LaMnO3 at 140 °C. Besides, the synergetic effect could also effectively preserve the activity of the perovskite catalysts (eg. LaMnO3) that almost the same removal efficiency (ca. 96.6% within 40 min) was obtained to styrene (initial concentration of 40 ppmv) after five continuous cycling tests. The highly and stably photothermocatalytic activity of these perovskites were attributed to the coefficient effect of the small crystal size and narrower bandgap as well as high visible light absorption and reducibility. This work could provide an efficient and practical way to utilize the total energy of sun for the remediation of atmospheric environment pollutions.

/pdf/visible-light-enhanced-photothermocatalytic-activity-of-abo3-4c7lbh05bk.pdf

Visible-light-enhanced photothermocatalytic activity of ABO3-type perovskites for the decontamination of gaseous styrene

PEG-assisted Synthesis of Homogeneous Carbon Nanotubes-MoS2-Carbon as a Counter Electrode for Dye-sensitized Solar Cells

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PEG-assisted Synthesis of Homogeneous Carbon Nanotubes-MoS2-Carbon as a Counter Electrode for Dye-sensitized Solar Cells