Jian Wang, Zhuoyang Xie, Li Li, Wei Ding, Zidong Wei
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引用次数: 0
Abstract
Air is commonly used as an oxidizer in proton–exchange
membrane
fuel cells. However, only 20.9% of air is oxygen and approximately
78% is nitrogen gas, which is inert and is often used to isolate oxygen.
We report that N2–phobicity together with confinement–catalysis
exponentially increases the power density of H2–air
fuel cells by selectively transporting oxygen from the air into a
confined space. N2–phobicity originates from a combination
of low nitrogen diffusion within ordered 1D pores and the unusual
confined nanospace with electron–rich Pt–N states that
enhance the electrostatic repulsion force to nitrogen. The resulting
fuel cell exhibited the highest mass activity, the lowest durability
decline, and a record high current density of 707 mA cm–2 at 0.8 V.
摘要在质子交换膜燃料电池中，空气是常用的氧化剂。然而，只有20.9%的空气是氧气，大约78%是氮气，氮气是惰性气体，通常用于分离氧气。我们报告说，通过选择性地将空气中的氧气输送到密闭空间中，二氧化氮疏水性和密闭催化作用一起以指数方式增加了h2 -空气燃料电池的功率密度。氮的疏水性源于有序一维孔隙中氮的低扩散和具有富电子Pt-N态的特殊受限纳米空间的结合，富电子Pt-N态增强了对氮的静电斥力。所得燃料电池表现出最高的质量活性，最低的耐久性下降，并在0.8 V下具有707 mA cm-2的高电流密度。
期刊介绍：
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