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Nanoporous (Pt1-xCox)3Al intermetallic compound as a high-performance catalyst for oxygen reduction reaction.

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Title: Nanoporous (Pt1-xCox)3Al intermetallic compound as a high-performance catalyst for oxygen reduction reaction.
Authors: Yao, Rui-Qi1, Han, Li-Ping1, Lang, Xing-You1 xylang@jlu.edu.cn, Cheng, Tuo1, Wen, Zi1, Liu, Gang1,2 lgsammer@mail.xjtu.edu.cn, Jiang, Qing1
Source: International Journal of Hydrogen Energy. Oct2018, Vol. 43 Issue 43, p19947-19954. 8p.
Subjects: Nanoporous materials, Platinum compounds, Cobalt compounds, Intermetallic compounds synthesis, Catalysts, Oxygen reduction, Energy conversion, Thermodynamic equilibrium
Abstract: Abstract Nanocatalysts that boost the sluggish kinetics of oxygen reduction reaction with a long-term durability are crucial for widespread use of low-temperature fuel cells. Here we report a nanoporous intermetallic compound typically composed of platinum–cobalt–aluminum intermetallic core with in-situ grown atomic-layer-thick Pt skin as a novel oxygen-reduction-reaction nanocatalyst with remarkably enhanced performance. Both Pt and Co atoms thermodynamically prefer to locate nearby Al element within face-centered cubic Pt 3 Al matrix via the formation of strong Pt Al and Co Al bonds, which not only enable synergistic ligand and compressive strain effects to moderately weaken the oxygen adsorption energy of Pt skin, but alleviate the evolution of surface Pt atoms to protect against the further dissolution of less-noble Co and Al. As a result, the nanoporous platinum–cobalt–aluminum nanocatalyst exhibits specific activity of 3.40 mA cm−2 Pt and mass activity of 2.2 A mg−1 Pt for the oxygen reduction reaction at 0.9 V versus reversible hydrogen electrode (∼13- and ∼20-fold enhancement relative to commercially available platinum nanoparticles supported carbon) with an exceptional durability, showing genuine potential as cathode catalyst in next-generation electrochemical energy conversion devices. Graphical abstract Image 1 Highlights • Scalable preparation of nanoporous Pt Co Al ternary intermetallic compound as ORR catalysts. • Nanoporous Pt Co Al intermetallic compound had a (Pt 1-x Co x) 3 Al/Pt core/shell structure. • Intermetallic compound was employed as matrix to control compressive strain of co incorporation. • Nanoporous Pt Co Al exhibited superior catalytic activity and stability for ORR. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Abstract Nanocatalysts that boost the sluggish kinetics of oxygen reduction reaction with a long-term durability are crucial for widespread use of low-temperature fuel cells. Here we report a nanoporous intermetallic compound typically composed of platinum–cobalt–aluminum intermetallic core with in-situ grown atomic-layer-thick Pt skin as a novel oxygen-reduction-reaction nanocatalyst with remarkably enhanced performance. Both Pt and Co atoms thermodynamically prefer to locate nearby Al element within face-centered cubic Pt 3 Al matrix via the formation of strong Pt Al and Co Al bonds, which not only enable synergistic ligand and compressive strain effects to moderately weaken the oxygen adsorption energy of Pt skin, but alleviate the evolution of surface Pt atoms to protect against the further dissolution of less-noble Co and Al. As a result, the nanoporous platinum–cobalt–aluminum nanocatalyst exhibits specific activity of 3.40 mA cm−2 Pt and mass activity of 2.2 A mg−1 Pt for the oxygen reduction reaction at 0.9 V versus reversible hydrogen electrode (∼13- and ∼20-fold enhancement relative to commercially available platinum nanoparticles supported carbon) with an exceptional durability, showing genuine potential as cathode catalyst in next-generation electrochemical energy conversion devices. Graphical abstract Image 1 Highlights • Scalable preparation of nanoporous Pt Co Al ternary intermetallic compound as ORR catalysts. • Nanoporous Pt Co Al intermetallic compound had a (Pt 1-x Co x) 3 Al/Pt core/shell structure. • Intermetallic compound was employed as matrix to control compressive strain of co incorporation. • Nanoporous Pt Co Al exhibited superior catalytic activity and stability for ORR. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2018.09.035