Achieving active and sustainable electrocatalysts for the oxygen reduction reaction with low cost and high performance attracts great interest in the field of fuel cells. Here, we report a facile route to prepare hollow CeO2/CePO4@N,P co‐doped carbon by pyrolyzing CeO2@polyaniline obtained in the presence of phytic acid. By virtue of the co‐doping of N and P elements as well as the existence of oxygen vacancies and the formation of a void, the product illustrated excellent catalytic activity towards the oxygen reduction reaction with onset and half‐wave potentials of 0.918 and 0.822 V, respectively, and a current density of 4.38 mA cm−2 at 0.565 V vs. RHE. Furthermore, it presented high durability and strong methanol tolerance, revealing its great potential for applications in energy conversion.
The intermediate
temperature solid oxide fuel cells (IT-SOFCs)
whose operating temperature ranges from 873 K to 1073 K have attracted
a lot of attention in recent years because of their decreased cost,
improved efficiency, and increased turn on/off switch speed. Nevertheless,
the reduced performance of the cathode when operating at the intermediate
temperature range becomes a challenge, due to the reduced catalytic
activity for oxygen reduction reaction (ORR) on traditional cathode
materials. Ideal cathodes are required to present efficient charge
and oxygen transfer processes. Herein, by constructing heterointerfaces,
we designed a novel composite cathode material PrSrFe0.5Co0.5O4–Pr0.4Sr0.6Fe0.5Co0.5O3 (PSFC214–113). According to the X-ray diffraction patterns and high-resolution
transmission electron microscopy, the PSFC214–113 composite material has been synthesized successfully. As a SOFC
cathode, PSFC214–113 maintains a high electronic
conductivity and excellent chemical compatibility. Compared to single-phase
materials, PSFC214–113 showed significantly lower
electrochemical impedance spectroscopy values and the peak power density
of cell reached a power density of 0.73 W cm–2.
The presence of heterointerfaces promoted electronic and oxygen migration
which, in turn, enhanced the oxygen reduction kinetics and provided
superior electrochemical performance to the material. Our results
reveal that the construction of heterointerfaces is an effective strategy
to enhance the oxygen reduction kinetics for the high-activity cathode.
Water splitting using earth-abundant, low-cost, highly efficient, transition-metal-based electrocatalysts with high activity and stability is inevitable for sustainable energy development. Herein, a molybdenum (Mo) and phosphorous (P) co-doped highly efficient and durable electrocatalyst is grown on nickel foam (P-NiCo 2 O 4 /CoMoO 4 /NF, for simplicity G-3) for hydrogen and oxygen evolution reactions (HER and OER, respectively). The dual doping of Mo and P prompts the formation of nanosheet array structures and modifies the surface electronic states, which subsequently enhance the active sites, facilitate the charge transfer, and accelerate the reaction kinetics. As a result, the G-3 sample requires a low overpotential of 78.7 mV and 248.6 mV to reach a current density of 25 mA cm À 2 for the HER and OER, respectively. Furthermore, a cell voltage of 1.729 V is required at 100 mA cm À 2 , and the catalyst demonstrates long-term stability of 54 h for overall water splitting.
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