Stable Multimetallic Nanoparticles for Oxygen Electrocatalysis
Stable Multimetallic Nanoparticles for Oxygen Electrocatalysis
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DOI：
10.1021/acs.nanolett.9b01523
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发表时间：
2019-08-01
期刊：
影响因子：
10.8
通讯作者：
Hu, Liangbing
中科院分区：
文献类型：
--
作者：
Lacey, Steven D.;Dong, Qi;Hu, Liangbing
纳米结构催化剂通常面临着一个重要的挑战：稳定性差。导致催化降解的因素很多，包括寄生化学反应、相分离、团聚和溶解，导致活性损失，特别是在长期催化反应中。一种新的催化剂家族--多金属纳米颗粒--也面临着这一挑战，它们因其广泛的可调性和高活性而出现。虽然在合成方面已经取得了重大进展，但这些纳米结构催化剂的稳定性，特别是在催化反应中的稳定性，还没有得到很好的解决。在这项研究中，我们通过非质子氧催化(Li-O-2电池)的演示，揭示了合成方法对纳米结构催化剂稳定性的关键影响。与传统的湿法浸渍(WI)相比，碳热冲击(CTS)法显著提高了相同元素组成的催化剂的整体结构和化学稳定性。对于多金属组合物(4元素和8元素)，通过CTS将更多的非催化活性元素加入到单个纳米粒子中，可以进一步提高电催化剂的整体稳定性和电池寿命。这些结果为稳定纳米结构催化剂提供了一条新的合成途径，可以预见氧电催化以外的其他反应方案。
Nanostructured catalysts often face an important challenge: poor stability. Many factors contribute to catalytic degradation, including parasitic chemical reactions, phase separation, agglomeration, and dissolution, leading to activity loss especially during long-term catalytic reactions. This challenge is shared by a new family of catalysts, multimetallic nanoparticles, which have emerged owing to their broad tunability and high activity. While significant synthesis-based advances have been made, the stability of these nanostructured catalysts, especially during catalytic reactions, has not been well addressed. In this study, we reveal the critical influence of a synthetic method on the stability of nanostructured catalysts through aprotic oxygen catalysis (Li-O-2 battery) demonstrations. In comparison to the conventional wet impregnation (WI) method, we show that the carbothermal shock (CTS) method dramatically improves the overall structural and chemical stability of the catalyst with the same elemental compositions. For multimetallic compositions (4- and 8-elements), the overall stability of the electrocatalysts as well as the battery lifetime can be further improved by incorporating additional noncatalytically active elements into the individual nanoparticles via CTS. The results offer a new synthetic path toward the stabilization of nanostructured catalysts, where additional reaction schemes beyond oxygen electrocatalysis are foreseeable.