Oxygen Reduction Reaction Activity of Microwave Mediated Solvothermal Synthesized CeO2/g-C3N4 Nanocomposite

Abstract

Electrocatalytic active species like transition metal oxides have been widely combined with carbon-based nanomaterials for enhanced Oxygen Reduction Reaction (ORR) studies because of the synergistic effect arising between different components. The aim of the present study is to synthesize CeO 2 /g-C 3 N 4 system and compare the ORR activity with bare CeO 2 . Ceria (CeO 2 ) embedded on g-C 3 N 4 nanocomposite was synthesized by a single-step microwave-mediated solvothermal method. This cerium oxide-based nanocomposite displays enhanced ORR activity and electrochemical stability as compared to bare ceria.

Nitrogen-Doped Ketjenblack Carbon Supported Co3O4 Nanoparticles as a Synergistic Electrocatalyst for Oxygen Reduction Reaction

“…To deeply understand the ORR reaction kinetics for the Co 3 O 4 /N-KC nanohybrid, LSV tests at different rotating speeds (400–2,500 rpm) were further conducted, as illustrated in Figure S4. As expected, the current density value increases with the enhancement of rotation speed since the diffusion distance becomes shortened at an improved rotation rate (Soren et al, 2019). Figure 4C displays the K-L lines of Co 3 O 4 /N-KC based on the rotation-speed-dependent currents under various potentials (0.3–0.7 V), and all of them possess excellent linearity.…”

Spindle-shaped CeO2/biochar carbon with oxygen-vacancy as an effective and highly durable electrocatalyst for oxygen reduction reaction

“…where, N is the collection efficiency of the RRDE (N ¼ 38%, as mentioned by the manufacturer). The %HO 2 À increases in the order of CeO 2 /BC700 (11.7%) < CeO 2 /BC800 (43.1%) < CeO 2 / BC900 (48.6%) < BC (70.8%) at 0.6 V, which has a good agreement with the n values and compared to other carbon supported CeO 2 based catalysts from literature reports [34,37]. Furthermore, the kinetics of ORR were determined by using the Koutecky-Levich (K-L) plot…”

“…Here, 'j' is the disc current density (mA cm À2 ) at 0.1 V, j k is the kinetic current density (mA cm À2 ), B is the K-L slope value, u is the electrode rotation rate (rpm), F is Faraday's constant (96,500C mol À1 ), C O2 is the concentration of oxygen (1.2 Â 10 À3 mol/L), D O2 is the oxygen diffusion coefficient (1.9 Â 10 À5 cm 2 s À1 ) and n is the kinematic viscosity (1 Â 10 À2 m 2 s À1 ) [37].…”

“…In another work, they reported CeO 2 embedded on graphitized-Carbon nitride (g-C 3 N 4 ) prepared by microwaveassisted solvothermal approach. The resulted CeO 2 /g-C 3 N 4 showed considerable ORR activity with the average number of electrons transferred as 3.2, due to the key role of pyridinic nitrogen from g-C 3 N 4 acting as a promoter of ORR [37]. Peng et al [38] reported the in-situ growth of CeO 2 on rGO through the controlled heat treatment under inert atmosphere.…”

A Review on Ceo2‐Based Electrocatalyst and Photocatalyst in Energy Conversion

“…[ 66 ] In addition to rGO, the C 3 N 4 was chosen to composite with CeO 2 to enhance ORR catalytic activity since the pyridinic nitrogen in C 3 N 4 functions as a promoter. [ 67 ] Most recently, Pi et al fabricated CeO 2 ‐encapsulated nitrogen‐doped biochars for ORR in Zn/air batteries with remarkable performance. [ 68 ] Experiment combined with DFT illustrates that the Lewis base sites, produced by pyri‐N and oxygen vacancy on CeO 2 , remarkably promote the chemisorption of O 2 molecules.…”