Interstitial Carbon-Doped PdMo Bimetallene for High-Performance Oxygen Reduction Reaction,ACS Energy Letters

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Interstitial Carbon-Doped PdMo Bimetallene for High-Performance Oxygen Reduction Reaction
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-09-09 , DOI: 10.1021/acsenergylett.2c01734
Ke Zhang _{1,

2} , Yucheng He ₁ , Ruiyun Guo ₃ , Weicong Wang _{1,

2} , Qi Zhan _{1,

2} , Rui Li _{1,

2} , Tianou He _{1,

2} , Chao Wu ₁ , Mingshang Jin _{1,

2}

Affiliation

Metallenes have been identified as one of the most promising electrocatalysts for fuel cells. However, non-noble metal species in metallenes would suffer from severe oxidation/dissolution during catalysis, causing vigorous activity decay. Here, we report that carbon doping can effectively enhance the catalytic activity and stability of metallenes for the oxygen reduction reaction (ORR). Taking PdMo bimetallene as an example, PdMo bimetallene toward ORR can exhibit ∼2 times the enhancement in mass and specific activities via carbon doping and retain ∼3 times more Mo than undoped bimetallene after 30 000 cycles. XPS and theoretical simulations reveal that the covalent bonds formed by the hybridization of Mo and C orbitals not only stabilize Mo species and inhibit the oxidation of Mo but also optimize the oxygen binding and thus improve the catalytic activity. The study sheds new light on the commercialization of metallene electrocatalysts in fuel cells.

中文翻译：

用于高性能氧还原反应的间隙碳掺杂 PdMo 双金属烯

金属烯已被确定为燃料电池最有前途的电催化剂之一。然而，金属烯中的非贵金属物种在催化过程中会遭受严重的氧化/溶解，导致剧烈的活性衰减。在这里，我们报告了碳掺杂可以有效地提高金属烯对氧还原反应（ORR）的催化活性和稳定性。以 PdMo 双金属烯为例，经过 30 000 次循环后，PdMo 双金属烯对 ORR 的质量和比活度可以通过碳掺杂提高 2 倍，并且比未掺杂双金属烯保留 3 倍以上的 Mo。XPS 和理论模拟表明，由 Mo 和 C 轨道杂化形成的共价键不仅可以稳定 Mo 物种并抑制 Mo 的氧化，还可以优化氧结合，从而提高催化活性。该研究为燃料电池中金属烯电催化剂的商业化提供了新的思路。

更新日期：2022-09-09

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