Ru-core@Pt-shell nanosheet for fuel cell electrocatalysts with high activity and durability
Ru-core@Pt-shell nanosheet for fuel cell electrocatalysts with high activity and durability
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DOI：
10.1016/j.jcat.2016.11.026
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发表时间：
2017
影响因子：
7.3
通讯作者：
Daisuke Takimoto;T. Ohnishi;J. Nutariya;Zhongrong Shen;Y. Ayato;D. Mochizuki;Arnaud Demortière;A. Boulineau;W. Sugimoto
中科院分区：
文献类型：
--
作者：
Daisuke Takimoto;T. Ohnishi;J. Nutariya;Zhongrong Shen;Y. Ayato;D. Mochizuki;Arnaud Demortière;A. Boulineau;W. Sugimoto
具有高活性和耐久性的铂基电催化剂是具有成本竞争力的聚合物电解质膜燃料电池所必需的。我们已经将核@壳纳米结构的高利用率和活性与原子级薄纳米片的高表面积和稳定性相结合，以提供对阴极和阳极反应都显示出增强的活性和耐久性的电催化剂。Ru核@Pt壳纳米片的平均厚度为1.5 - 4.5 Pt单层，其电化学活性Pt表面积为112 - 151 m2（g-Pt）-1，是典型Pt/C催化剂的1.4 - 1.9倍。具有单层Ru-核和平均3.5单层Pt-壳负载在碳上的催化剂（Ru@Pt-3.5ML（ns）/C）对于具有较慢降解速率的氧还原反应显示出比基准Pt/C催化剂高4.5倍的质量活性，使该纳米材料成为最活性和最耐用的Pt基催化剂之一。对于阳极反应，Ru@Pt-1.5ML（ns）/C在纯H2和含300 ppm CO的H2中的氢氧化活性比Pt@Pt-1.5ML（ns）/C高2倍，且对电位循环的稳定性更好。
Pt-based electrocatalysts with higher activity and durability are necessary for cost-competitive polymer electrolyte membrane fuel cells. We have combined the high utilization and activity of core@shell nanostructures with the high surface area and stability of atomically thin nanosheets to afford electrocatalysts that show enhanced activity and durability for both cathode and anode reactions. Ru-core@Pt-shell nanosheets with an average thickness of 1.5–4.5 Pt monolayers have an electrochemically active Pt surface area of 112–151 m2(g-Pt)−1, 1.4–1.9 times larger than typical Pt/C catalysts. A catalyst with a monolayer Ru-core and an average 3.5 monolayer Pt-shell supported on carbon (Ru@Pt-3.5ML(ns)/C) shows 4.5 times higher mass activity than benchmark Pt/C catalyst for the oxygen reduction reaction with a slower degradation rate, making this nanomaterial one of the most active and durable Pt-based catalysts. For the anode reactions, Ru@Pt-1.5ML(ns)/C shows 2 times higher apparent mass activity for the hydrogen oxidation activity in pure H2as well as 300 ppm CO containing H2, and better stability against potential cycling.