Laser ablation in liquid (LAL), one of the promising pathways to produce nanoparticles, is used herein for the modification of the abundant biowaste, calcium lignosulfonate (CLS), adorning it with palladium nanoparticles (Pd NPs). The ensuing Pd/CLS nanocomposite, fabricated via a simple stirring method, is deployed for hydrogen storage and environmental cleanup studies; a hydrogen storage capacity of about 5.8 C g^–1 confirmed that Pd NPs serve as active sites for the adsorption of hydrogen. Additionally, the novel, sustainable, and reusable nanocomposite also exhibits superior catalytic activity toward the reduction of hexavalent chromium [Cr(VI)], 4-nitrophenol (4-NP), and methylene blue (MB) in an aqueous solution in a short time; the synthesized nanocatalyst could be reused for at least eight successive runs.

In this paper, a pillared layer mixed ligand metal–organic framework (MOF), namely, DMOF-1–Zn was synthesized via anodic dissolution in an electrochemical cell. The influence of different reaction parameters such as solvent, additive and current density on the textural properties of the MOF obtained were investigated. The characterization of the samples involved powder X-ray diffraction, infrared Fourier transform spectroscopy, and field emission scanning electron microscopy. Moreover, the electrochemical route was successfully combined with a coordination modulation approach to prepare specific morphology at the nano-scale. The main advantages of electrosynthesis are the shorter synthesis time, the milder conditions, the facile synthesis of MOF nanostructures and the morphology tuning.

Electrochemical behaviour of Alamar Blue (resazurin) at a glassy carbon electrode in aqueous buffered solutions and room-temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate, [C4mim][BF4], was studied using the cyclic voltammetry, chronoamperometry and chronocoulometry techniques. Our data confirm that the electrochemical reduction of resazurin in aqueous solutions takes place in two processes. In the first step, the cyclic voltammogram reveals an irreversible two-electron process leading to resorufin, whereas in the second step, cyclic voltammogram displays a reversible two-electron process related to the formation of dihydroresorufin. In [C4mim][BF4], however, our voltammetric data indicate that the reduction of resazurin takes place in two one-electron processes. The diffusion coefficient of resazurin in aqueous buffered solution and in [C4mim][BF4] was also determined using the both single potential-step chronoamperometry and chronocoulometry techniques. It is found that the diffusion coefficient varies from 8.5 × 10⁻⁷ cm² s⁻¹ in aqueous solution to 1.2 × 10⁻⁷ cm² s⁻¹ in [C₄mim][BF₄]. The orientation of adsorbed resazurin on the surface of glassy carbon electrode was also estimated. It is found that the orientation of the adsorbed resazurin at glassy carbon surface is edgewise.

Great efforts have been made to design and fabricate low-cost, high efficiency advanced electrode materials for energy storage devices such as batteries and high-performance supercapacitors. Choosing organic and redox active species that increase the faradaic charge storage of electrode systems has thus become a challenge to increase energy density and conductivity. To this aim, herein, azure A/3D graphene aerogel (Az–GA), and trypan (Try) blue–nickel metal–organic framework (Try–Ni-MOF) nanosheet array redox active electrodes are fabricated via a hydrothermal method and used in an asymmetric supercapattery. Az links to 3D GA via π–π interactions to form an anode. A nickel chloride hexahydrate array combines with Try as a MOF to form a cathode. These redox active materials increase the faradaic charge storage of the system. The as-prepared asymmetric device shows a high specific capacitance of 319 F g⁻¹ at 1 A g⁻¹, a specific energy of 66.55 W h kg⁻¹, a specific power of up to 4.45 kW kg⁻¹, and a higher capacity retention of 92.12% after 5000 charge–discharge cycles at 10 A g⁻¹. This device exhibits a broad potential window of 1.60 V and represents a promising strategy toward safe and sustainable energy storage devices.