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.
Highly selective two electron oxygen reduction pathway to generate hydrogen peroxide using four different rare earth (Pr, Nd, Sm, Gd) oxides has been studied. From the rotating‐ring‐disc electrochemical experimental observations, it can be concluded that among the four rare earth oxides, Gd2O3 shows higher ring current and can efficiently produce H2O2 (yield of HO2−=80 %) following 2 electron (number of electrons involved in the process was calculated as 2.2) pathway in 0.1 M KOH. The selectivity for H2O2 was improved by the synergistic coexistence of volcano carbon (VC) with rare‐earth oxides, while Nd2O3 mixed with VC ink showed maximum (91.91 %) selectivity for the H2O2 production. The electrochemical active surface area calculated by measuring the charging current of the electric double layer is compared. The ORR kinetics of the synthesized catalysts were studied by comparing the rate constants and tafel slopes at selected potential ranges.
The persistently increasing energy consumption and the deficiency of conventional fuels have raised serious concern in the recent years. The advanced energy conversion technologies like fuel cells have been benefitted by the development of suitable catalytic materials that can effectively carry out appropriate electrochemical processes like oxygen reduction reaction (ORR). Direct Methanol Fuel cells (DMFCs) act as an energy conversion device and the efficiency can be enhanced with active ORR catalysts. Here, we have reported the ORR activity of Ni doped CeO 2 /rGO synthesized by microwave mediated hydrothermal method. We have observed that the synergistic interaction between Ni doped CeO 2 and rGO is responsible for the enhanced ORR activity. The optimized 5% Ni-CeO 2 /rGO was evaluated as the most efficient ORR catalyst among all other composites with onset ORR potential À 0.17 V vs. Ag/AgCl and limiting current density 3.67 mA/cm 2 . The 5% Ni-CeO 2 /rGO catalyst showed better stability and methanol tolerant when compared with commercial Pt/C.
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