One-pot Hydrothermal Route Research Articles

Honey-Derived Hydrochar Containing 2,2,6,6-tetramethylpiperidine-1-oxyl Free Radical for Degradation of Aqueous Organic Pollutants

The increasing demand for greener technologies in environmental remediation makes carbon materials from biomass and its derivatives some of the most attractive resources for a sustainable future. However, integrating these materials with stable free radicals remains challenging. This study presents a straightforward one-pot hydrothermal route using raw honey as the carbon source and 4-amino 2,2,6,6-tetramethylpiperidine-1-oxyl (4-amino-TEMPO) as the free radical. The addition of TEMPO derivative initiates Maillard reactions between its amino group and the carbonyl groups of the carbohydrates in honey, resulting in the formation of a functionalized hydrochar with a spherical morphology (~ 8 μm). The presence of free radicals within the carbonaceous matrix was confirmed by electron spin resonance spectroscopy, supported by infrared spectroscopy, elemental analysis, thermal analysis, scanning electron microscopy, and X-ray photoelectron spectroscopy. The free radical content was estimated at 0.4 mmol∙g-1. The material effectively removed methylene blue, fluorescein, and doxorubicin from water in the presence of green oxidants like hydrogen peroxide and sodium hypochlorite. After 24 h, removal efficiencies reached 92% for doxorubicin, 73% for methylene blue, and 23% for fluorescein. Moreover, the hydrochar demonstrated good regeneration capability, maintaining its dye removal efficiency over several cycles.

Synthesis and assessment of the Mo/MoO3/CZTS/Ag diode fabricated by one-pot hydrothermal route: impact of temperature

A facile one-step hydrothermal method was utilized to prepare Cu2ZnSnS4 film employing EDTA as a complexing agent. An effective Molybdenum oxide layer was also formed in the same approach for forming the Cu2ZnSnS4 film. The influence of preparation temperature on structural, morphology, and optical characteristics was studied. The formation of crystalline kesterite phase Cu2ZnSnS4 films with preferred orientation along the (112) plane was confirmed by X-ray diffraction and Raman spectroscopy, and it was also demonstrated that structure property changes with preparation temperatures: kesterite phase Cu2ZnSnS4 is formed at lower preparation temperatures and kesterite phase Cu2ZnSnS4 and Cu2S are formed with increasing preparation temperature. Also, Raman analysis confirmed the formation of a Molybdenum oxide layer on the Mo substrate. Field emission scanning electron microscopy revealed that surface morphology changes from leaves of trees to flake-flowers. According to UV-visible analysis, Cu2ZnSnS4 films exhibited high and wide absorbance spectra in the visible and infrared regions and a band gap between (1.67-1.9) eV. Photoluminescence analysis revealed emission peaks at (1.569, 1.55, and 1.56) eV for samples prepared at (160, 200, and 230)0C, respectively, which is very close to the band's gap of Cu2ZnSnS4. Finally, the electrical study of Mo/MoO3/CZTS/Ag junctions was performed by using current-voltage (I-V) measurement.

Activation of persulfate over double S-scheme photocatalyst fabricated by decoration of Fe2(MoO4)3 and MoO3 on modified g-C3N4 for degradation of pollutants

The development of nanostructured photocatalysts with high activity is essential for the remediation of effluents. Herein, modified g-C3N4 (M-CN) was integrated with Fe2(MoO4)3/MoO3 (FMO/MO) nanoparticles by one-pot hydrothermal route, and employed to activate persulfate (PS) under visible light. The M-CN/FMO/MO nanocomposites exhibited superior performance in photocatalytic removal of three antibiotics, containing amoxicillin (AMX), azithromycin (AZT), and tetracycline (TC), and three dye pollutants, including rhodamine B (RhB), methylene blue (MB), and methyl orange (MO). The activity of M-CN/FMO/MO (20 %)/PS system for the removal of TC was 1.83, 5.86, and 55.0 folds as high as M-CN/FMO/MO (20 %), M-CN, and CN photocatalysts, respectively. The formation of a double S-scheme system enhanced the photocatalytic performance by effectively retaining electrons and holes, which have strong redox capabilities. This configuration significantly minimized charge recombination, thereby promoting efficient charge transfer and migration. Moreover, there was a significant increases in surface area compared to pure components, which provided active sites for pollutants. Eventually, the recycling test and successful growth of wheat seeds exhibited that the M-CN/FMO/MO (20 %)/PS system can be suitable for wastewater treatment. It is hoped that this system with attractive properties could be used as a promising system in wastewater detoxification.

Amorphous mesoporous sulfur-rich 1T/2H-MoS2 nanospheres as high-capacity cathode materials for advanced magnesium ion batteries

Two-dimensional layered-structure MoS2 has been explored as the promising cathode materials for magnesium ion batteries benefited by its wide layer distance and satisfactory capacity. However, such strong interaction between Mg2+ and MoS2 brings about the sluggish diffusion kinetics and irreversible electrochemical reaction, leading to a decreased specific capacity and poor rate capability. How to adopt its structure engineering and interface engineering to boost the Mg2+ diffusion kinetics and enhance the electrochemical reversibility of MoS2 is still a huge challenge. Herein, the amorphous sulfur-rich 1T/2H-MoS2 mesoporous nanospheres (a-MoS2+x, 0<x<1) have been developed via a facile one-pot hydrothermal route. Acted as a cathode material for magnesium ion batteries, owing to the cooperate effects of inherent rich active sites, high conductivity and wide layer distance induced by the coexistence of sulfur-rich, 1T phase and nearly amorphous features, the as-prepared a-MoS2+x demonstrates an ultra-high discharge capacity (438.7 mAh g−1 for 50 cycles at 0.1 A g−1), promising rate capability (97.6 mAh g−1 at 1.0 A g−1), and good cyclic stability (110 cycles at 0.5 A g−1), superior to the crystalline MoS2 (c-MoS2) and other previously reported MoS2 counterparts. Besides, the kinetics results indicate that the a-MoS2+x manifests good charge transfer and diffusion kinetics, and its entire charge storage is a combination of surface-controlled capacitance behavior and diffusion-controlled battery behavior. Moreover, some ex-situ Raman, XPS and HRTEM characterization techniques are employed to disclose the Mg2+ storage mechanism. Such remarkable magnesium storage properties of a-MoS2+x demonstrates its promising application as cathode for magnesium ion batteries.

G-C3N4 tubes decorated with MnMoO4·H2O: Outstanding S-scheme photocatalyst for detoxification of water pollutants upon visible light

Recently, the utilization of heterogeneous photocatalysts has been proposed as an effective solution for environmental purification, as one of the solar energy conversion processes, under mild conditions. In this research, MnMoO4·H2O nanoparticles were anchored on tubular g-C3N4 (abbreviated as TGCN) by a one-pot hydrothermal route. The phase structure, electronic environment, spectroscopic characteristics, composition, morphology, surface area, and electrochemical properties of the resultant materials were explored using XRD, XPS, EDX, FESEM, HRTEM, FTIR, PL, photocurrent, EIS, and BET analyses. The photocatalytic activity of TGCN/MnMoO4·H2O (20 %) nanocomposite was 4.25, 5.36, 9.07, 12.4, and 8.84 times better than modified GCN, and 3.91, 2.77, 6.24, 10.9, and 6.82 times higher than MnMoO4·H2O in removals of tetracycline, rhodamine B, methylene blue, methyl orange, and fuchsine pollutants, respectively. The improved visible-light absorption and rapid charge migration/separation between TGCN and MnMoO4·H2O counterparts through S-scheme heterojunction route were the key reasons for the boosted photocatalytic performance. The biocompatibility of solution after decomposition of tetracycline via the growth of wheat seeds was verified. Finally, the stability of the binary TGCN/MnMoO4·H2O (20 %) heterostructure was measured by the stability test after four reuses.

Integration of Bi nanoparticles with brown TiO2 co-modified by Bi2Fe4O9 and BiFeO3: Double S-scheme photocatalysts towards degradation of pollutants

Recently, plasmonic photocatalysts fabricated using non-noble element of Bi have presented promising performances to tackle environmental and energy issues. Herein, we integrated Bi nanoparticles with brown TiO2 (denoted as TOX) co-modified by Bi2Fe4O9/BiFeO3 components to fabricate double S-scheme plasmonic photocatalysts through a one-pot hydrothermal route. The results showed that the optimum TOX/Bi2Fe4O9/BiFeO3/Bi photocatalyst decomposed tetracycline about 36.1, 7.05, and 5.13 times superior than TOX, Bi2Fe4O9/BiFeO3, and TOX/Bi2Fe4O9/BiFeO3 samples, respectively. More importantly, the resulting plasmonic photocatalyst exhibited superior photodegradation activities against the removal of other antibiotics such as azithromycin and amoxicillin, and dyes such as methylene blue, malachite green, and rhodamine B upon visible light. The extraordinary performance of rationally designed plasmonic photocatalyst was devoted to more harnessing of visible light and boosting charge segregation among the components facilitated by double S-scheme heterojunctions. The scavenging studies exhibited the formation of •OH, •O2−, and h+ reactive species over TOX/Bi2Fe4O9/BiFeO3/Bi nanocomposite under visible light. Considering the high stability, facile fabrication procedure, excellent biocompatibility, and impressive performance of TOX/Bi2Fe4O9/BiFeO3/Bi photocatalyst in destroying a wide range of contaminants in water, it is inferred that other impressive plasmonic photocatalysts-based on Bi can be designed and developed for effectively addressing the environmental issues upon visible light.

Optimizing phosphorene nanosheets for high performance all-solid asymmetric supercapacitors: A theoretical and experimental insight

This study probably for the first-time introduced a phase and morphology-tuned scalable, cost-effective method for large-scale production of Black Phosphorous/Phosphorene (BP), and investigated their in-depth electrochemical properties. Utilizing a one-pot mild wet chemical-assisted hydrothermal route in ethylenediamine, high-quality BP nanosheets were synthesized from amorphous red phosphorus (RP) with nearly 100 % conversion efficiency, yielding 7.1352 g for one batch at 130–170 °C. The resulting phosphorene nanosheets exhibited a small crystalline size (2.708 nm), hierarchically porous morphology, a 1.64 eV direct optical bandgap aligned with theoretically calculated bandgap using LDA approximation, and various structural defects, along with large specific surface area (50 m2g−1) and reduced number of layers (4–5) compared to prior literatures, suggesting electrochemical superiority. CV and GCD measurements in the potential window of −0.7 V to 0.1 V revealed its highest pseudo-capacitance response (84.91 %), reaching a maximum specific capacitance value of 759.748 Fg−1 at current density 2 Ag−1, surpassing all previous records. Moreover, BP displayed excellent cyclic stability of 89.8 % after 10,000 cycles, making it an excellent electrode material for supercapacitors. A solid-state asymmetric supercapacitor device (HASD), using BP, successfully lighted up 6 red LEDs for 10 s, achieving maximum specific energy density at 73.43 Wkg−1 at a power density of 1500 Wkg−1.

Hollow NiMo-based nitride heterojunction with super-hydrophilic/aerophobic surface for efficient urea-assisted hydrogen production

Hydrogen evolution reaction (HER) and urea oxidation reaction (UOR) are key reactions of the water-cycling associated catalytic process/device. The design of catalysts with a super-hydrophilic/aerophobic structure and optimized electron distribution holds great promise. Here, we have designed a three-dimensional (3D) hollow Ni/NiMoN hierarchical structure with arrayed-sheet surface based on a one-pot hydrothermal route for efficient urea-assisted HER based on a simple hydrothermal process. The Ni/NiMoN catalyst exhibits super-hydrophilic/aerophobic properties with a small droplet contact angle of 6.07° and an underwater bubble contact angle of 155.7°, thus facilitating an escape of bubbles from the electrodes. Density functional theory calculations and X-ray photoelectron spectroscopy results indicate the optimized electronic structure at the interface of Ni and NiMoN, which can promote the adsorption/desorption of reactants and intermediates. The virtues combining with a large specific surface area endow Ni/NiMoN with efficient catalytic activity of low potentials of 25 mV for HER and 1.33 V for UOR at 10 mA cm−2. The coupled HER and UOR system demonstrates a low cell voltage of 1.42 V at 10 mA cm−2, which is approximately 209 mV lower than water electrolysis.

Superhydrophobic ZIF-67 with exceptional hydrostability

Zeolitic Imidazolate Framework-67 (ZIF-67) has been used in a variety of applications including catalysis, separations, and energy storage. However, the weak hydrostability of ZIF-67, due to structural hydrolysis and degradation, dramatically limits their applicability after aqueous exposure. In this work, cosolvent-stabilized superhydrophobic, highly hydrostable ZIF-67 was synthesized at room temperature using a facile, one-pot hydrothermal synthesis route, and the effect of cosolvent concentration on ZIF-67 crystal structure properties and hydrostability was studied systematically. The underlying mechanism for the cosolvent-supported hydrostability improvement was also proposed. Furthermore, the influence of hydrotreatment on the resultant ZIF-67s' catalytic performance was studied in the ‘Sabatier reaction’ for CO2 to synthetic natural gas (CH4) conversion. The ZIF-67-derived calcined catalysts obtained from the hydrotreated samples of the cosolvent-stabilized ZIF-67 exhibited no prominent loss in catalytic performance and showed better CO2 conversion, higher CH4 selectivity, and less CO production, in comparison to the conventional ZIF-67 samples. Notably, the use of a lower ligand-to-metal ratio (∼8) in the current synthesis significantly reduced the overall chemical consumption, achieving highly economically and environmentally friendly manufacturing of exceptionally hydrostable ZIF-67.

One-pot decoration of CdS and CdMoO4 nanoparticles on g-C3N4 nanoplates: Boosted photocatalytic degradation of tetracycline

Photocatalytic water detoxification has been a hot-spot research field in recent years. In this regard, CdS and CdMoO4 nanoparticles were decorated on g-C3N4 nanoplates via a one-pot hydrothermal route. The morphology, structure, phase, surface properties, electrochemical, and optical properties of the resultant materials were identified by XRD, FT-IR, UV–vis DRS, FESEM, TEM, HRTEM, XPS, EDX, EIS, BET, BJH, and PL analyses. The optimum ternary nanocomposite exhibited boosted activity for degradation of tetracycline (TC), Congo red (CR), methylene blue (MB), methyl orange (MO), and malachite green (MG) upon visible light, which was 41.6, 29.0, 16.1, 27.4, and 38.2 times higher than pristine g-C3N4. The UV–vis DRS, EIS, PL, and BET analyses attributed the boosted activity to the generation of more charge carriers, promoted segregation and transfer of charges, and extended surface area. The quenching experiments confirmed the crucial role of holes and superoxide anion radicals in the degradation reaction. Eventually, based on the outcomes, a probable mechanism for the boosted photocatalytic ability was discussed.

Facile growth of kesterite CZTS film by one-pot hydrothermal route using EDTA as complex agent for heterojunction solar cell applications: influence of zinc concentration

Facile growth of kesterite CZTS film by one-pot hydrothermal route using EDTA as complex agent for heterojunction solar cell applications: influence of zinc concentration

Bimetallic metal organic framework-derived Co9S8-MoS2 nanohybrids as an efficient dual functional electrocatalyst towards the hydrogen and oxygen evolution reactions

Electrochemical water splitting is promising system for the efficient hydrogen production. Much effort has been devoted to developing cost-effective, catalytically active, and stable electrocatalysts for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). In this work, we synthesized Co9S8-MoS2 nanohybrid structures derived from CoMo-based bimetallic metal–organic frameworks via a one-pot hydrothermal route followed by sulfurization. Co9S8-MoS2 nanohybrids, composed of small Co9S8-MoS2 core–shell nanospheres covered by large Co9S8/MoS2 nanostructures, are efficient electrocatalysts for both the HER and OER owing to their porous bimetallic structures with large number of surface area and numerous catalytically active sites. The Co9S8-MoS2 nanohybrids show small overpotentials of 110 and 270 mV at 10 mA cm−2 in 1.0 M KOH for the HER and OER, respectively. Furthermore, even after 1000 cycles, the Co9S8-MoS2 nanohybrids exhibited good stability and small Tafel slopes of 59 and 66 mV dec−1 for both the HER and OER, respectively, demonstrating their potential in practical applications for water splitting.

In-situ growth of hierarchically porous FeNi2S4/Ti3C2Tx nanosheets arrays on Ni-Fe foam for overall water splitting

Ti3C2Tx nanosheets arrays sandwiched with FeNi2S4 nanoparticles are in-situ grown on Ni-Fe foam (FeNi2S4-Ti3C2Tx@NFF) via a facile one-pot hydrothermal route. The as-prepared FeNi2S4-Ti3C2Tx@NFF exhibits simultaneously excellent catalytic activity towards oxygen and hydrogen evolution reactions with low overpotentials (136 and 97 mV at 10 mA cm-2, respectively) and superior stability. Moreover, a symmetrical electrolyzer utilizing FeNi2S4-Ti3C2Tx@NFF as the anode and cathode only requires 1.51 V for overall water splitting to reach 10 mA cm-2, and can continuously operate at 20 mA cm-2 for 100 h. The outstanding catalytic performance of the catalyst can be attributed to increased active sites in the well-dispersed FeNi2S4 nanoparticles, enhanced electronic conductivity due to introduction of Ti3C2Tx nanosheets, strong electronic coupling between Ti3C2Tx and FeNi2S4, improved mass transfer through the hierarchically porous structures and robust self-supporting configuration.

QDs-sized TiO2-x/Bi12O15Cl6/BiOCl photocatalysts with tandem n-n heterojunctions: Facile fabrication and impressive visible-light-induced photocatalytic performances

In the present study, we combined brown TiO2 (denoted as TiO2-x) with Bi12O15Cl6 and BiOCl components via a one-pot hydrothermal route preceded by calcination at 500 ○C. The resultant novel photocatalyst was characterized by TEM, SEM, XRD, XPS, EDX, UV–vis DRS, FTIR, Raman, PL, photocurrent density, BET, and EIS analyses. The quantum dots (QDs)-sized TiO2-x/Bi12O15Cl6/BiOCl nanocomposite exhibited a significant photocatalytic ability upon visible light for the photodegradation of tetracycline (TC) with the rate constant of 379 × 10−4 min−1, which was 28.3 and 9.92 times as high as pristine TiO2 and TiO2-x, respectively. Moreover, compared with TiO2, the optimum photocatalyst presented boosted activity of 25.3 and 23.7 times in the degradations of rhodamine B and Fuchsine, and 23.0 folds in the reduction of Cr (IV) to Cr (III). The photoluminescence, electrochemical, and textural analyses showed that the boosted activity of ternary TiO2-x/Bi12O15Cl6/BiOCl photocatalyst is attributed to impressive separation and transfer of the photoinduced charges, and high surface area. The improved charge separation mechanism was devoted to developing tandem n-n heterojunctions amongst TiO2-x, Bi12O15Cl6, and BiOCl counterparts, as well as the construction of a QDs-sized photocatalyst. Moreover, the photocatalyst displayed considerable reusability in the TC degradation reaction. At last, the biocompatibility of the treated solution over the optimum TiO2-x/Bi12O15Cl6/BiOCl nanocomposite was proved by the growth of wheat seeds.

Enhanced upconversion luminescence in LaVO4:Yb3+/Er3+ nanorods through Ba2+ ions doping

The low efficiency of upconversion luminescence hinders the pratical applications in many optical fields. During the past years, much attention have focused on the fluorides, reports of lanthanum vanadate (LaVO4) in oxides are scarce. Herein, a series of LaVO4:Yb3+/Er3+ crystals codoping with Ba2+ ions are synthesized through one-pot facile hydrothermal route. Many instruments, such as XRD, ICP, TEM equipped with EDS, luminescence spectroscopy are applied to characterize the products. By optimizing the impurity doping content to 15 mol%, the upconversion luminescence intensities of the green and red emissions are enhanced by 23 and 25 times, respectively. A formation mechanism for morphology evolution is proposed. The enhancement of upconversion performance are systematacially investigated upon the grain size, crystal structure symmetry and doping concentration. Moreover, additional operations are carried out by DFT calculations to confirm the experimental result. This work will guide to enhance upconversion performance based on lanthanum vanadate nanocrystals through impurity doping, which may realize the prospective applications in many fields.

Tailoring Morphology in Hydrothermally Synthesized CdS/ZnS Nanocomposites for Extraordinary Photocatalytic H2 Generation via Type-II Heterojunction

CdS@ZnS core shell nanocomposites were prepared by a one-pot hydrothermal route. The morphology of the composite was tuned by simply changing the Zn2+ precursor concentration. To characterize the samples prepared, various techniques were employed, including XRD, FESEM, TEM, XPS and UV-vis DRS. The band gaps of CdS and ZnS were measured to be 2.26 and 3.32 eV, respectively. Compared with pure CdS, the CdS@ZnS samples exhibited a slight blue shift, which indicated an increased band gap of 2.29 eV. The CdS@ZnS core shell composites exhibited efficient photocatalytic performance for H2 generation under simulated sunlight illumination in contrast to pure CdS and ZnS. Additionally, an optimized H2 generation rate (14.44 mmol·h−1·g−1cat) was acquired at CdS@ZnS-2, which was approximately 4.6 times greater than that of pure CdS (3.12 mmol·h−1·g−1cat). Moreover, CdS@ZnS heterojunction also showed good photocatalytic stability. The process of charge separation over the photocatalysts was investigated using photoelectrochemical analysis. The findings indicate that the CdS@ZnS nanocomposite has efficient charge separation efficiency. The higher H2 generation activity and stability for CdS@ZnS photocatalysts can be attributed to the intimate interface in the CdS@ZnS core–shell structure, which promoted the light absorption intensity and photoinduced charge separation efficiency. It is expected that this study will offer valuable insights into the development of efficient core shell composite photocatalysts.

V6O13 Micro-Flower Arrays Grown In Situ on Ni Foam as Efficient Electrocatalysts for Hydrogen Evolution at Large Current Densities

Developing a high-activity, robust and economic electrocatalyst for large-scale green hydrogen production is still of great significance. Herein, a novel V6O13 nanosheets self-assembled micro-flower array self-supporting electrode is synthesized using a facile one-pot hydrothermal route. Owing to the large electrochemically active surface area of a unique hierarchical micro-flower and the stable all-in-one structure, the as-prepared V6O13/NF electrode delivers impressive HER activity with extremely low overpotentials of 125 and 298 mV at large current densities of 100 and 1000 mA cm−2, respectively, and a long-term durability for at least 90 h in an alkaline condition. This work extends the application of vanadium oxides to the realm of electrocatalytic hydrogen fuel production.

Rapid photodegradation of toxic organic compounds and photo inhibition of bacteria in the presence of novel hydrothermally synthesized Ag/Mn–ZnO nanomaterial

Purified water is the most concerning issue these days, and utmost conventional practices are allied with various downsides. Therefore, an ecologically benign and easily amicable therapeutic approach is the requirement. In this wonder, nanometer phenomena bring an innovative change to the material world. It has the potential to produce nanosized materials for wide-ranging applications. The subsequent research highlights the synthesis of Ag/Mn–ZnO nanomaterial via a one-pot hydrothermal route with an efficient photocatalytic activity against organic dyes and bacteria. The outcomes revealed that the size of the particle (4–5 nm) and dispersion of spherically shaped silver nanoparticles intensely affected by employing Mn–ZnO as a support material. Use of silver NPs as a dopant activates the active sites of the support medium and provides a higher surface area to upsurge the degradation rate. The synthesized nanomaterial was evaluated against photocatalytic activity using Methyl orange and alizarin red as model dyes and confided that more than 70% of both the dyes degraded under 100 min duration. It is well recognize that the modified nanomaterial recreates an essential role in every light-based reaction, and virtually produced highly reactive oxygen species. The synthesized nanomaterial was also evaluated against E. coli bacterium both in light and dark. The zone of inhibition in the presence of Ag/Mn–ZnO was observed both in light (18 ± 0.2 mm) and dark (12 ± 0.4 mm). The hemolytic activity shows that Ag/Mn–ZnO has very low toxicity. Hence, the prepared Ag/Mn–ZnO nanomaterial might be an effective tool against the depletion of further harmful environmental pollutants and microbes.

MoS2–CoS2 synergistic nanoarchitecture-based hollow microspheres for long-life thermal batteries

CoS2 is considered as a substitute cathode material for FeS2 in long-life thermal batteries due to its higher thermal stability. However, the CoS2 nanocrystals synthesized by hydrothermal method suffer from serious agglomeration and high crystal defects, which limit their specific capacity and thermal stability. Here, we successfully synthesized a MoS2–CoS2 synergistic nanoarchitecture-based hollow microsphere through a facile one-pot hydrothermal route. A three-stage growth mechanism of MoS2–CoS2 microsphere during the evolution process is revealed. The agglomeration problems are solved and the electrochemical properties are improved due to the porous loose structure as well as the synergistic effect of CoS2 and MoS2. As a result, MoS2–CoS2 cathode exhibits a long discharge time of 4800 s and a large specific capacity of 333.33 mAh g−1 at a current density of 50 mA cm−2 under a cut-off voltage of 1 V at 500 °C. Moreover, good pulse stability and thermal shock resistance are also achieved. This work provides a promising design strategy for cathode materials with high stability and high capacity to realize long-life thermal batteries.

Mo-doped cobalt-manganese layered double hydroxide for oxygen evolution reaction

Mo plays an important role in modulating the electronic structure of layer double hydroxides (LDHs) for enhancing the oxygen evolution reaction (OER) performance. Herein, CoMn2Mo-LDH/NF electrocatalyst was synthesized through one-pot hydrothermal route. The dopant of Mo boosted valence ratio of Co3+/Co2+, thus improving intrinsic catalytic activity of CoMn2Mo-LDH for OER. Besides, CoMn2Mo-LDH/NF only required 242 mV and ran stably more than 24 h at 10 mA/cm2 for OER. Additionally, it maintained long-term stability over 60 h in 1 M KOH at 10 mA/cm2 for water splitting.