Pt Nanorods Oriented on Gd-Doped Ceria Polyhedra Enable Superior Oxygen Reduction Catalysis for Fuel Cells
Pt Nanorods Oriented on Gd-Doped Ceria Polyhedra Enable Superior Oxygen Reduction Catalysis for Fuel Cells
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DOI：
10.1016/j.jcat.2022.02.009
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发表时间：
2022-02
影响因子：
7.3
通讯作者：
Guoyu Shi;Tetsuro Tano;D. Tryk;A. Iiyama;M. Uchida;Yasufumi Kuwauchi;Akihiro Masuda;K. Kakinuma
中科院分区：
文献类型：
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作者：
Guoyu Shi;Tetsuro Tano;D. Tryk;A. Iiyama;M. Uchida;Yasufumi Kuwauchi;Akihiro Masuda;K. Kakinuma
提高氧还原反应（ORR）性能是减少燃料电池中铂催化剂用量的迫切需要。其中一个最有前途的策略是利用双组分甚至多组分的协同催化能力的界面工程。在此，我们合成了由Pt纳米棒原子取向于gd掺杂氧化铈多面体的（1 1 1）纳米面组成的电催化剂，该电催化剂的四电子ORR性能远远优于商用Pt/C催化剂，ORR的本能谱活性比Pt/C提高了4倍，并且产生的不良双电子ORR产物H2O2要少得多。它还具有显著的稳定性，在5000次循环测试中，活性降低可以忽略不计。Pt（11 11）表面的暴露和氧空位介导的界面PtCe合金化促进了o_2的吸附和解离以及OHad的解吸，这可以解释异常的ORR电催化性能。
Promoting the oxygen reduction reaction (ORR) performance is an urgent need to reduce the amount of Pt catalysts in fuel cells. One of the most promising strategies is interface engineering which takes advantage of the synergistic catalytic proficiencies of double or even multiple components. Herein, we synthesized the electrocatalyst that comprises Pt nanorods atomically oriented along the (1 1 1) nanofacets of Gd-doped cerium oxide polyhedra, which was much superior to commercial Pt/C catalyst for the four-electron ORR, with a 4-fold improvement of ORR intrinsic activity than Pt/C, as well as producing much less of the undesirable two-electron ORR product H2O2. It also features a remarkable stability, with negligible activity degradation in 5000-cycle test. The exposure of Pt(1 1 1) facets and the oxygen vacancy-mediated interfacial PtCe alloying facilitate O2adsorption and dissociation together with desorption of OHad, which can account for the exceptional ORR electrocatalytic performance.