期刊
CHEMICAL ENGINEERING JOURNAL
卷 431, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133237
关键词
Pd nanosheets; Wrinkles; Compressive strain; Electrocatalyst; Oxygen reduction reaction
资金
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies [JJNY201904]
- Open Project of the State Key Laboratory of Trauma, Burn and Combined Injury, Third Military Medical University [SKLKF202012]
This work presents the synthesis of highly wrinkled ultrathin Pd nanosheets as an advanced catalyst for Oxygen reduction reaction (ORR) in acidic medium. The catalyst shows higher catalytic activity, more positive half-wave potential, and better stability compared to commercial Pt/C. The study reveals that the compressive strain created from the wrinkles plays a crucial role in reducing the reaction barrier and improving the stability of the Pd catalyst.
Although great efforts have been devoted to developing Pd-based catalysts to take the place of Pt toward Oxygen reduction reaction (ORR) in acidic medium, the progress is notably slower than expected. In this work, highly wrinkled ultrathin Pd nanosheets are synthesized and further demonstrated as an advanced catalyst for ORR, holding higher catalytic activity, 26 mV more positive half-wave potential and better stability than the commercial Pt/C. Theoretical studies reveal that the compressive strain created from the wrinkles can crucially downshift d-band center of Pd to reduce the reaction barrier of the rate determining steps of ORR for fast kinetics. The modulated electronic structure of Pd by the introduction of wrinkles display a major role in improving the stability. This work offers a non-Pt, highly active, and stable catalyst for ORR by tailoring the geometric structure of Pd, while shedding a scientific light on the enhancement mechanism of a nanostructure on electrocatalytic activity and stability.
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