Enhanced Oxygen Reduction Activity on Carbon Supported Pd Nanoparticles Via SiO₂

Abstract

To improve Pd‐based catalysts activity and stability is still challenge although Pd‐based catalysts have attracted attention for oxygen reduction reaction (ORR) during recent years. In this study, we have prepared supported Pd on SiO2, in which conductive carbon was used by coprecipitation method Pd/SiO2@C or physically mixed Pd/SiO2.Pd/SiO2@C (10 wt%) owned more outstanding catalytic activity, preferable durability, and stronger methanol tolerance capability in alkaline solution for ORR, which compared with commercial Pt/C (20 wt%) and Pd/C catalysts. We analyzed the morphology and electronic properties of the catalyst by SEM, TEM, XRD and XPS. It was found that the introduction of SiO2 changed the electronic structure of palladium, resulting in the production of electron‐rich Pd NPs, which was further confirmed by density functional theory calculations. Therefore, the introducing a small amount of SiO2 plays a vital role in facilitating the ORR activity of Pd‐based catalysts, which may be a new strategy to design new ORR catalysts and replace Pt‐based catalysts in fuel.

Synergistic effect of doped nitrogen and oxygen-containing functional groups on electrochemical synthesis of hydrogen peroxide

“…The lower FE in the test was due to the side reactions, including the hydrogen evolution reaction and oxygen reduction reaction to produce H 2 O. 47 All results with no quadratic function relationship were in the predictable concentration trend range, providing an excellent reference value for the actual production of H 2 O 2 .…”

Carbon and Oxygen-Doped Phosphorus Nitride (COPN) for Continuous Selective and Stable H2O2 Production

“…However, interestingly, two distinct decreasing trends were observed at specific current density ranges, approximately between 80 and 120 and 130–140 mA/cm 2 , respectively. It was proposed that the first decreasing trend was attributed to the competition of the H 2 O 2 reduction reaction, as reported in previous studies. , The second decreasing trend was proposed to be linked to the occurrence of the 4e – ORR reaction, leading to the generation of H 2 O . The analysis of current densities (Figure d–f) revealed that the optimum current density for the electrocatalytic production of H 2 O 2 using the COPN-3 catalyst was 130 mA/cm 2 across various pH environments.…”

“…57,58 The second decreasing trend was proposed to be linked to the occurrence of the 4e − ORR reaction, leading to the generation of H 2 O. 59 The analysis of current densities (Figure 4d−f) revealed that the optimum current density for the electrocatalytic production of H 2 O 2 using the COPN-3 catalyst was 130 mA/cm 2 across various pH environments. At this optimized current density, the COPN-3 catalyst demonstrated remarkable performance, yielding high H 2 O 2 concentrations over 120 min.…”

Unravelling charge-transfer in Pd to pyrrolic-N bond for superior electrocatalytic performance

“…13 Alternatively, it has long been predicted that metal to substrate charge-transfer interactions (MSI) can be used for regulating the metal-oxygen bond-strengths [22][23][24] and was demonstrated experimentally using various substrates such as sp 2 carbon derivatives recently for improved ORR activity. 25,26 The benefits of using graphene as a substrate include two additional aspects i.e. the defects provide anchoring points to the metal to offer higher stability and prohibits the Ostwald ripening of the nanoparticles during growth to improve catalyst surface-area.…”