Nitrogen-doped carbon nanotubes (NCNTs) serve as a multifunctional support for cobalt selenide (CoSe2) nanoparticles, forming a hybrid catalyst designated CoSe2@NCNTs. This design effectively enhances the dispersion of CoSe2 nanoparticles while inducing structural modifications that significantly improve catalytic performance in acidic environments. The resulting material exhibits exceptional selectivity and stability for the electrocatalytic two-electron oxygen reduction reaction (2e- ORR), enabling efficient hydrogen peroxide (H₂O₂) production. In 0.1 M HClO₄ electrolyte, CoSe2@NCNTs achieves a remarkable H₂O₂ selectivity of 93.2% and a high yield rate of 172 ppm·h⁻¹, maintaining excellent durability over 24 hours of continuous operation. These results surpass those of pure CoSe2 and many previously reported catalysts under similar conditions. The enhanced performance is attributed to four key factors: (1) NCNTs induce a phase transformation from orthorhombic to cubic CoSe2, which favors the 2e- ORR pathway; (2) the NCNT matrix stabilizes CoSe2 nanoparticles, preventing aggregation and degradation; (3) the carbon support promotes better dispersion of smaller nanoparticles, increasing accessible active sites; and (4) nitrogen functionalities in NCNTs enhance electronic conductivity and surface reactivity, facilitating faster electron transfer kinetics.
Electrochemical characterization confirms the superior activity of CoSe2@NCNTs. Rotating ring disk electrode (RRDE) measurements reveal a more positive onset potential (~0.68 V vs. RHE) and higher current density compared to pure CoSe2 (~0.58 V vs. RHE). The ring current response indicates a significantly improved O₂-to-H₂O₂ conversion efficiency, with a 1.3-fold increase at 0.25 V. Tafel analysis shows a low slope of 39.8 mV·dec⁻¹, indicating favorable reaction kinetics. The electron transfer number remains close to 2 across the tested potential range, confirming a dominant 2e- pathway.Leptin Antibody Cancer Electrochemical impedance spectroscopy (EIS) further demonstrates reduced charge transfer resistance, suggesting enhanced conductivity due to NCNT integration.SH3GL1 Antibody Technical Information Double-layer capacitance measurements confirm a larger electrochemical active surface area (1.PMID:35203409 07 mF·cm⁻²) for CoSe2@NCNTs versus pure CoSe2 (0.093 mF·cm⁻²), underscoring the role of NCNTs in exposing more active sites.
Bulk electrolysis experiments validate practical H₂O₂ generation. Under chronoamperometric conditions at 0 V vs. RHE, the catalyst delivers a peak H₂O₂ yield rate of 172 ppm·h⁻¹, demonstrating its potential for scalable production. Spectrophotometric quantification using Ce⁴⁺ titration confirms consistent and accurate H₂O₂ detection, with a linear calibration curve (R² = 0.9999) between absorbance at 320 nm and concentration. Furthermore, the catalyst enables effective electro-Fenton degradation of rhodamine B (RhB), achieving complete removal within 40 minutes. This highlights the dual functionality of CoSe2@NCNTs—simultaneously producing H₂O₂ and utilizing it in situ for environmental remediation. Long-term stability tests show only a 9% loss in current after 24 h, whereas pure CoSe2 suffers a 91% decline, illustrating the critical role of NCNTs in enhancing durability. Post-reaction XRD analysis confirms structural integrity, reinforcing the robustness of the hybrid system. Overall, CoSe2@NCNTs represents a promising, low-cost, noble-metal-free alternative for sustainable H₂O₂ electrosynthesis in acidic media, with significant implications for industrial and environmental applications.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com
