Ngan Nguyen Le

The Ni/Cu ₂ O electrocatalyst, featuring improved *NO ₂ → *NO conversion and an enriched amount of surface-chemisorbed hydroxyl/water species, exhibits enhanced electrochemical nitrate-to-ammonia reduction performance.

The electrochemical behavior of DTPA and its hybrid with defected graphene toward photocatalytic application was investigated.

The intrinsic material properties play a more decisive role in governing electrocatalytic performance than the presence of abundant oxygen vacancies.

Graphite rods from spent zinc-carbon batteries were upcycled into graphite oxide (GO) via a cathodic surface-plasma exfoliation process, enabling the simultaneous degradation of methyl orange (MO) dye and structural transformation of the graphite electrode. The MO degradation process followed a first-order kinetic model, achieving a 98.4% removal after 30 min of plasma treatment. Under the high-energy plasma environment, the graphite layers underwent exfoliation, partial reduction, and defect generation, producing GO enriched with oxygen-containing functional groups. This upcycled GO was subsequently employed as the active electrode material for symmetric solid-state supercapacitors by using PVA-based gel electrolytes. The GO/MO device, obtained from plasma treatment in the MO-containing electrolyte, exhibited significantly improved electrochemical performance, delivering a specific capacitance of 310.05 F g^-1 at 0.5 A g^-1 and an energy density of 15.5 Wh kg^-1. It also maintained 92.71% of its initial capacitance after 10,000 charge-discharge cycles.

Sodium‐ion batteries (SIBs) have attracted increasing attention as promising alternatives to lithium‐ion batteries for large‐scale energy storage owing to the natural abundance and low cost of sodium resources. However, the development of high‐capacity and durable anode materials still hindered by volume expansion and structural degradation of alloying‐ and conversion‐type materials during repeated sodiation/desodiation. Herein, a sustainable mechanochemical upcycling strategy is proposed to convert zinc recovered from spent zinc–carbon batteries into recycled zinc phosphide/carbon (rZnP ₂ /C) composite anodes through a two‐step high‐energy ball‐milling process. In this approach, zinc recovered from waste zinc–carbon batteries was converted into zinc phosphide and subsequently composited with hard carbon and carbon nanotubes (CNTs). Hard carbon served as a buffering matrix to mitigate the volume expansion of zinc phosphide, while CNT formed continuous conductive networks that improved the electrical conductivity of the composite. By optimizing the hard carbon content, the rZnP ₂ /C‐2 composite exhibited the best electrochemical performance, delivering an initial discharge capacity of 469.19 mAh g ^–1 at 100 mA g ^–1 , retaining 269.37 mAh g ^–1 at a high current density of 1500 mA g ^–1 , and maintaining a reversible capacity of 128.50 mAh g ^–1 after 1000 cycles at 500 mA g ^–1 . This work demonstrates an effective mechanochemical upcycling strategy for transforming spent zinc–carbon batteries into value‐added ZnP ₂ ‐based composite anodes, providing a sustainable route toward high‐performance SIBs and battery waste valorization.

The oxygen vacancy-mediated BiCuO _x heterostructure catalyst alleviates the NO ₂ * intermediate poisoning on the catalyst surface, resulting in enhanced NH ₃ production performance via nitrate electrochemical reduction.

This study explores the inhibitive and formation mechanism of stictic acid (SSA) protective layer on mild steel in simulated E85 biogasoline. We employed a seamlessly, modern multi-technique approach to investigate the involved processes at the steel/E85 interfaces over time, including electrochemical (electrochemical impedance spectroscopy - EIS, potential dynamics - PD), spectroscopy (Raman), and surface analysis (Scanning Electron Microscopy - SEM), with the assistance of quantum chemical simulation (DFT). The electrochemical data (time-resolved EIS and PD) revealed that SSA can form a protective barrier on the steel’s surface, with the protection efficiency depending on the applied SSA concentration. At an optimum amount of SSA (50 ppm), data from EIS showed the most prominent electrochemical characteristics in the steel surface’s resistance and capacitance. PD results further reinforced this finding, revealing a significant drop in the overall corrosion rate when SSA concentrations were within a specific range. Additionally, the corrosion protection has declined at concentrations beyond the optimum value. SEM images and Raman spectra comparing the steel surface at different protective conditions showed that SSA significantly minimized corrosion damage on the inhibited samples, confirmed by the presence of SSA’s peaks and a reduction of corrosion products on the surface.DFT calculations indicate that different functional regions in the SSA structure simultaneously donate and accept electrons to/from the steel substrate surface, helping to create a strong bond between SSA/steel at the steel/E85 interface. However, as the SSA concentration increases, intramolecular interactions (SSA-SSA) will dominate over intermolecular interactions (SSA-Fe), leading to a decrease in the protective efficacy of the coating.