Boosting electrochemical stability of ultralow-Pt nanoparticle with Matryoshka-like structure in polymer electrolyte membrane fuel cells
Boosting electrochemical stability of ultralow-Pt nanoparticle with Matryoshka-like structure in polymer electrolyte membrane fuel cells
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DOI：
10.1016/j.apcatb.2019.118450
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发表时间：
2020-07
影响因子：
22.1
通讯作者：
Hyun-Yong Lee;Ji Eun Park;Ok-Hee Kim;W. Hwang;Hee Ji Choi;J. Yang;Chi‐Yeong Ahn;Myung Su Lim;Insoo Choi;Yong‐Hun Cho;Y. Sung
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文献类型：
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作者：
Hyun-Yong Lee;Ji Eun Park;Ok-Hee Kim;W. Hwang;Hee Ji Choi;J. Yang;Chi‐Yeong Ahn;Myung Su Lim;Insoo Choi;Yong‐Hun Cho;Y. Sung
具有核壳结构的电化学催化剂因其提高的效率和活性而受到广泛关注。其中，具有CuPd合金核的材料比具有单一金属Pd核的材料表现出更好的活性，被认为是一种优异的核材料。然而，先前报道的具有CuPd核的Pt催化剂的优越性能仅在半电池中观察到，并没有体现甚至扩展到单电池。我们报道了具有类似俄罗斯套娃结构的催化剂，具有铂外层、铜夹层和钯核心，用于氧还原反应。该催化剂在半电池中的 Pt 质量活性比商业 Pt/C 高 3.4 倍，并且在单电池中也表现更好，浓度仅为 0.056mgPtcm−2。特别是，该催化剂的稳定性满足DOE 2020年目标，稳定性测试期间该催化剂的电化学表面积损失仅为40%，而Pt/C的电化学表面积损失为80%。
Electrochemical catalysts with a core-shell structure have received much attention because of their enhanced efficiency and activity. Among them, those with a CuPd alloy core exhibit better activity than the ones with a single metal Pd core, which is known to be an excellent core-material. However, the superior performance of previously reported Pt catalysts with CuPd core has only been observed in half-cells, and was not reflected or even expanded to single-cells. We report catalysts having a Matryoshka-like structure with a Pt outer-layer, Cu interlayer, and Pd core for oxygen reduction reaction. This catalyst has 3.4 times higher Pt mass activity than the commercial Pt/C in half-cells, and also performs better in single-cells at only 0.056 mgPtcm−2. Particularly, the stability of this catalyst satisfies the 2020 DOE target, and electrochemical surface area loss during the stability test is only 40 % for this catalyst, while that of Pt/C is 80 %.