Ni@PdNiOx Bimetallic Synergism and Oxide Site Modulation to Boost Oxygen Electrocatalysis in Highly Durable Zn-Air Batteries
Wen Zhang , Ning Zhang , Jianyang Gao , Fusheng Liu , Yang Zhang , Guang-Rui Xu , Lei Wang
Chemical Research in Chinese Universities ›› : 1 -11.
Ni@PdNiOx Bimetallic Synergism and Oxide Site Modulation to Boost Oxygen Electrocatalysis in Highly Durable Zn-Air Batteries
Recently, zinc-air batteries have been of great interest due to their high theoretical specific energy that plays an important role in renewable energy conversion, while the sluggish kinetics of their half-reactions of oxygen reduction and oxygen evolution (ORR/OER) limit their widespread applications. Herein, we report the synthesis of self-assembly Ni@PdNiOx seashell-like nanostructures (Ni@PdNiOx NSs) with low Pd content through a novel one-step wet chemical method for the first time. The optimized self-assembly Ni@PdNiOx NSs with a thickness of 2.06 nm are connected self-assembled to form a network structure, which exhibits a large surface area and unprecedented ORR/OER with a positive half-wave potential of 0.892 V vs. RHE and an overpotential of 230 mV at 10 mA/cm2 in alkaline solution, outperforming most of the PdNi catalysts. When the self-assembly Ni@PdNiOx NSs are applied as electrodes for zinc-air batteries, they deliver a high power density of 88.9 mW/cm2 and an impressive energy density of 714 mA·h·g−1. This work opens up a new strategy for generating superior oxygen electrocatalysis and provides new insight into the correlation of low Pd content and Ni in the improvement of alkaline oxygen electrocatalysis.
Low content precious metal / Rechargeable Zn-air battery / Seashell-like nanostructure / Network structure / Bifunctional oxygen electrocatalyst
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Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH
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