Anion constructor for atomic-scale engineering of antiperovskite crystals for electrochemical reactions

Title
Anion constructor for atomic-scale engineering of antiperovskite crystals for electrochemical reactions
Authors
천동원유성종김남동박희영이세현이명재장인준장주혁이동욱김승훈진하늘최대일이정희임경민이응준정재영이수형강윤식함형철이국승안도천김필
Keywords
acidic media; atomic-scale engineering; electrocatalysis; electrochemical reactions; palladium alloys
Issue Date
2021-04
Publisher
Advanced functional materials
Citation
VOL 31, NO 16, 2009241
Abstract
Among the Pt group metals, Pd has been considered the most efficient for application in electrocatalysts as an alternative to Pt. Despite the comparable electrochemical activities of Pd and Pd-metal alloys, they are vulnerable to liquid acidic electrolytes, leading to degradation of catalytic activity. Pd-Ni alloys have been used to enhance catalytic activity because the electronic structure of Pd can be easily changed by adding Ni. In other studies, N atoms have been introduced for more stable M-Ni catalysts by inducing the formation of Ni4N species; however, the structural analysis and the role of nitrogen have not been fully understood yet. Herein, the Pd?Ni alloy nitride with a unique crystal structure shows a promising catalytic activity for oxygen reduction reaction (ORR). The nitride PdNi nanoparticles have a novel monolithic antiperovskite structure of chemical formula (PdxNi1-x)NNi3. The unique antiperovskite crystal (PdxNi1?x)NNi3 possesses superior ORR activity and stability, originating from the downshifted d-band center of the monolayer Pd/antiperovskite surface and the lower formation energy of the antiperovskite core nanocrystal. Consequently, (PdxNi1-x)NNi3, as a Pt-free Pd-based electrocatalyst, overcomes the stability issue of Pd under acidic conditions by achieving 99-times higher mass activity than commercial Pd/C, as shown by the durability test.
URI
http://pubs.kist.re.kr/handle/201004/73159
ISSN
1616-301X
Appears in Collections:
KIST Publication > Article
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