-60 °C solution synthesis of atomically dispersed cobalt electrocatalyst with superior performance.,Nature Communications

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-60 °C solution synthesis of atomically dispersed cobalt electrocatalyst with superior performance.
Nature Communications ( IF 14.7 ) Pub Date : 2019-02-05 , DOI: 10.1038/s41467-019-08484-8
Kai Huang _{1,

2} , Le Zhang ₃ , Ting Xu ₄ , Hehe Wei ₁ , Ruoyu Zhang ₁ , Xiaoyuan Zhang ₄ , Binghui Ge _{5,

6} , Ming Lei ₂ , Jing-Yuan Ma ₇ , Li-Min Liu _{3,

8} , Hui Wu ₁

Affiliation

Temperature can govern morphologies, structures and properties of products from synthesis in solution. A reaction in solution at low temperature may result in different materials than at higher temperature due to thermodynamics and kinetics of nuclei formation. Here, we report a low-temperature solution synthesis of atomically dispersed cobalt in a catalyst with superior performance. By using a water/alcohol mixed solvent with low freezing point, liquid-phase reduction of a cobalt precursor with hydrazine hydrate is realized at -60 °C. A higher energy barrier and a sluggish nucleation rate are achieved to suppress nuclei formation; thus atomically dispersed cobalt is successfully obtained in a catalyst for oxygen reduction with electrochemical performance superior to that of a Pt/C catalyst. Furthermore, the atomically dispersed cobalt catalyst is applied in a microbial fuel cell to obtain a high maximum power density (2550 ± 60 mW m-2) and no current drop upon operation for 820 h.

中文翻译：

-60°C溶液合成具有优异性能的原子分散钴电催化剂。

温度可以控制溶液中合成产物的形态，结构和性能。由于成核的热力学和动力学，低温下溶液中的反应可能会产生与高温下不同的物质。在这里，我们报告了一种性能优异的催化剂中原子分散钴的低温溶液合成方法。通过使用低凝固点的水/醇混合溶剂，在-60℃下实现了钴前体与水合肼的液相还原。获得更高的能垒和缓慢的成核速率以抑制核形成。因此，在氧还原催化剂中成功获得了原子分散的钴，其电化学性能优于Pt / C催化剂。此外，

更新日期：2019-02-05

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