4.8 Article

Lamellar-assembled PdNi super-nanosheets as effective oxygen redox dual-electrocatalysts for rechargeable Zn-air batteries

Journal

NANO RESEARCH
Volume 16, Issue 2, Pages 2163-2169

Publisher

TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-022-4966-2

Keywords

Pd-based nanomaterials; oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) bifunctional electrocatalysts; Zn-air batteries; PdNi super-nanosheets; electronic interaction

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In this study, lamellar-assembled PdNi super-nanosheets (SNSs) were synthesized and used as bifunctional electrocatalysts for rechargeable metal-air batteries. The PdNi SNSs showed enhanced ORR kinetics and improved OER electrocatalysis compared to commercial Pt/C and RuO2 benchmark materials. The power density of the Zn-air battery using Pd92Ni8 SNSs/C as the air cathode was significantly higher than that of the Pt/C benchmark.
Exploration of bifunctional electrocatalysts toward effective oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is pivotal for developing high-efficiency and rechargeable metal-air batteries but remains great challenging. Here we elaborately synthesize lamellar-assembled PdNi super-nanosheets (SNSs) with an optimized Pd/Ni molar ratio to serve as attractive ORR and OER bifunctional electrocatalysts for rechargeable high-powered Zn-air batteries (ZABs). The products are layer-by-layer stackings of ultrathin PdNi nanosheet motifs. On the drastically extended two-dimensional (2D) surface, the inserted Ni atoms can substantially lower down the d-band center of surface Pd toward improved ORR kinetics and concurrently create oxytropic NiOx sites to adsorb-OH groups for promoting the reverse OER electrocatalysis. Specifically, the ORR mass activity and specific activity of the primary Pd92Ni8 SNSs attain 2.5 A-mg(-1) and 3.15 mA.cm(-2), which are respectively 14 and 9 times those of commercial Pt/C. Meanwhile, the OER activity and stability of Pd92Ni8 SNSs/C distinctly outperform those of the RuO2 benchmark, suggesting excellent reversible oxygen electrocatalysis. The power density of the ZAB with Pd92Ni8 SNSs/C as the air cathode is 2.7 times higher than that by Pt/C benchmark. Significantly, it can last for over 150 h without significant performance degradation during the charge-discharge cycle test. This work showcases a feasible strategy for developing self-assembled multimetallic 2D nanomaterials with excellent bifunctional catalytic performances toward energy conversion applications.

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