Tribidasari Anggraningrum Ivandini

Hydrogen has emerged as one of the most promising alternatives to fossil fuels, while electrochemical water splitting has attracted considerable attention as a sustainable and environmentally friendly strategy for green hydrogen production. In this process, efficient electrocatalysts are essential to accelerate the hydrogen evolution reaction (HER), reducing energy consumption and improving hydrogen production efficiency. Among various porous materials, metal–organic frameworks (MOFs) have become highly attractive HER electrocatalysts. In particular, lanthanide‐based MOFs (Ln‐MOFs) have recently gained increasing interest because of their unique electronic structures associated with localized 4f orbitals, large coordination numbers, tunable porosity, excellent stability, and highly flexible coordination environments. These characteristics enable modulation of active‐site accessibility, hydrogen adsorption energetics, and interfacial charge‐transfer behavior, making Ln‐MOFs highly promising platforms for advanced HER electrocatalysis under acidic and alkaline conditions. This review comprehensively discusses recent advances in Ln‐MOF‐based electrocatalysts for HER applications, including their structural characteristics, catalytic mechanisms, electrocatalytic performance, and structure–activity relationships. Various strategies for enhancing HER activity and major challenges associated with Ln‐MOF synthesis and practical HER implementation are also described. Finally, future perspectives and research directions are proposed to guide the rational design of Ln‐MOF‐based HER electrocatalysts for sustainable hydrogen production and carbon‐neutral energy technologies.

Electrochemiluminescence (ECL) of luminol has been studied on a screen-printed gold electrode for a simple and sensitive detection of arsenic ions (As(III)). Cyclic voltammetry (CV) was applied as the proposed technique to study luminol’s electrochemical behavior and to evaluate the arsenic’s effect in the ECL system, while hydrogen peroxide (H2O2) served as a co-reactant to enhance luminol’s light emission under alkaline conditions. To achieve optimal electrode performance, key parameters including pH, scan rate, and the concentrations of H2O2 and luminol were carefully optimized. The presence of As(III) induced a quenching effect on the luminol/H2O2 ECL system, leading to a linear decrease in ECL signal across the wide concentration range of 1 nmol·L–1 to 150 µmol·L–1. The system demonstrated a low detection limit of 1.21 nmol·L–1 and exhibited excellent repeatability with a relative standard deviation of 2.27%, highlighting its sensitivity and reliability for As(III) detection. A key advantage of this study was the successful use of commercial bare electrodes, which were readily available and required no modifications, proving their effectiveness for ECL-based arsenic sensing. The optimized buffer solution pH of 10 played a critical role in enhancing arsenic detection selectivity, as it facilitated the optimal deprotonation of luminol and ensured arsenic remained in its dissolved state, whereas other potential metal ion interferences were more likely to form solid metal (hydro)oxides. Furthermore, the developed sensor was successfully applied for As(III) detection in a seawater matrix, demonstrating its potential as a robust and effective ECL-based arsenic sensor for environmental applications.

A newly identified selective interaction between As( iii ) and luminol enhances the formation of excited 3-aminophthalate, thereby amplifying the ECL signals.

Biomass-derived carbon, obtained from renewable organic materials, offers several advantages, including sustainability, cost-effectiveness, and excellent electrochemical properties, such as high energy and power densities, adjustable morphologies, and cycling stability. However, the limitation of carbon-based materials can be addressed through surface modification with layered materials such as, layered double hydroxides, metal dichalcogenides, graphene, vanadium pentoxide and the new emerging material MXene. This review highlights techniques particularly heteroatom doping and chemical or physical activation to further enhance the electrochemical performance of biomass-derived carbon as supercapacitors. It also examines the synthesis of MXenes, two-dimensional transition metal carbides and nitrides, known for high conductivity, structural stability, and versatile surface chemistry. Despite these advantages, MXenes face challenges such as self-oxidation, self-discharging, and nanosheets restacking, which limit long-term stability. The effective strategies including surface and interlayer modifications and optimized synthesis route, are explored to significantly improve the electrochemical performance MXene-based composites. Additionally, the enrichment of biomass waste and the role of MXenes in electrical double-layer (EDLCs) and pseudocapacitance are emphasized, with MXene offering continuous electron transport channels, high oxidation resistance, and structural stability. Ultimately, integrating biomass-derived carbon with MXenes offers promising pathway to develop high-performance, sustainable supercapacitors for efficient energy storage solutions in future applications.

This study investigates how cationic solvation engineering with 18-crown-6 ether (18C6) impacts CO ₂ RR by selectively coordinating K ⁺ , offering a strategy for improving CO ₂ RR efficiency.

Perylene tetracarboxylic acid (PTCA) was prepared and employed as an ECL luminophore with K ₂ S ₂ O ₈ as the co-reactant, for the detection of folic acid on SPCE. A linear decrease in ECL intensity was observed with increasing folic acid concentration.