Unique Ni Crystalline Core/Ni Phosphide Amorphous Shell Heterostructured Electrocatalyst for Hydrazine Oxidation Reaction of Fuel Cells,ACS Applied Materials & Interfaces

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Unique Ni Crystalline Core/Ni Phosphide Amorphous Shell Heterostructured Electrocatalyst for Hydrazine Oxidation Reaction of Fuel Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-05-07 00:00:00 , DOI: 10.1021/acsami.9b00878
Jin Zhang ₁ , Xinyue Cao ₁ , Min Guo ₁ , Haining Wang ₁ , Martin Saunders ₂ , Yan Xiang ₁ , San Ping Jiang ₃ , Shanfu Lu ₁

Affiliation

It is highly attractive but challenging to develop transition-metal electrocatalysts for direct hydrazine fuel cells (DHzFCs). In this work, a nickel crystalline [email protected] phosphide amorphous shell heterostructured electrocatalyst supported by active carbon ([email protected]/C) is developed. [email protected]/C with a P/Ni molar ratio of 3:100, [email protected]_3.0/C, exhibits outstanding catalytic activity for the hydrazine oxidation reaction (HzOR) in alkaline solution, achieving a much better catalytic activity (2675.1 A g_Ni^–1@0.25 V vs RHE) and high stability, as compared to Ni nanoparticles supported on carbon (Ni/C) and Pt/C catalysts. The results indicate that formation of the NiP amorphous shell effectively inhibits the passivation of the Ni core active sites and enhances the adsorption of hydrazine on Ni by improving the adsorption energy, leading to high electrochemical activity and stability of the [email protected]_3.0/C catalysts for HzOR. The density functional theory calculation confirms the structural and electrocatalytic effect of the core–shell heterostructure on the stability and activity of Ni active sites for HzOR. The unique crystalline core/amorphous shell-structured [email protected]/C demonstrates promising potential as an effective electrocatalyst for DHzFCs.

中文翻译：

燃料电池肼氧化反应的独特镍结晶核/磷化磷非晶壳杂结构电催化剂

开发用于直接肼燃料电池（DHzFC）的过渡金属电催化剂是极具吸引力的，但具有挑战性。在这项工作中，开发了一种由活性炭（[受电子邮件保护] / C）负载的镍晶体[受电子邮件保护]的磷化物无定形壳异质结构电催化剂。[电子邮件保护] / C，P / Ni摩尔比为3：100，[电子邮件保护] _3.0 / C，在碱性溶液中对肼氧化反应（HzOR）表现出出色的催化活性，实现了更好的催化活性（2675.1） A g _Ni^–1与负载在碳（Ni / C）和Pt / C催化剂上的Ni纳米粒子相比，@ Rs相对于RHE的V值为0.25，并且具有很高的稳定性。结果表明，NiP非晶壳的形成有效地抑制了Ni核活性位的钝化，并通过提高吸附能而增强了肼在Ni上的吸附，从而提高了电化学活性和[email protected] _3.0 / C的稳定性。HzOR的催化剂。密度泛函理论计算证实了核-壳异质结构的结构和电催化作用对HzOR的Ni活性位的稳定性和活性的影响。独特的结晶核/非晶壳结构[受电子邮件保护] / C展示了作为DHzFCs的有效电催化剂的有前途的潜力。

更新日期：2019-05-07

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