CoNi Alloy Nanoparticles Encapsulated in N-Doped Graphite Carbon Nanotubes as an Efficient Electrocatalyst for Oxygen Reduction Reaction in an Alkaline Medium,ACS Sustainable Chemistry & Engineering

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CoNi Alloy Nanoparticles Encapsulated in N-Doped Graphite Carbon Nanotubes as an Efficient Electrocatalyst for Oxygen Reduction Reaction in an Alkaline Medium
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-06-08 , DOI: 10.1021/acssuschemeng.1c02098
Lijuan Niu ₁ , Guohua Liu ₁ , Yifan Li ₁ , Jiawen An ₁ , Boyuan Zhao ₁ , Jingsu Yang ₁ , Dan Qu ₁ , Xiayan Wang ₁ , Li An ₁ , Zaicheng Sun ₁

Affiliation

Transition metal alloys and their compounds have been drafted as relatively economic and high-activity non-noble metal electrocatalysts for the oxygen reduction reaction (ORR). However, the stability of catalysts is regarded as a critical issue for practical application. Here, we report CoNi alloy nanoparticles embedded in a nitrogen-doped graphite carbon nanotube (CoNi@N-GCNT-FD) electrocatalyst, which is synthesized from metal precursors and dicyandiamide nanofibers formed by freeze-drying pretreatment. The electrocatalyst exhibits remarkable ORR performance (a positive onset potential at 0.90 V vs reversible hydrogen electrode (RHE), a half-wave potential at 0.84 V vs RHE, and a high limiting current density (6.4 mA cm^–2)) in an alkaline medium. The outstanding ORR catalytic behavior is attributable to the properties with a high specific surface area and the collaborative influence between a CoNi alloy and a nanotube protective layer. The CoNi@N-GCNT-FD also displays antimethanol toxicity and good stability over 10,000 cycles, attributed to the unique structure of N-GCNT that is more conducive to mass transfer and protects the alloy particles from corrosion under harsh conditions. This simple route can be widely used to prepare other alloy electrocatalysts with relatively economic value and high performance in power conversion and stockpile device fields.

中文翻译：

包裹在 N 掺杂石墨碳纳米管中的 CoNi 合金纳米颗粒作为碱性介质中氧还原反应的有效电催化剂

过渡金属合金及其化合物已被设计为相对经济和高活性的非贵金属电催化剂，用于氧还原反应 (ORR)。然而，催化剂的稳定性被认为是实际应用的关键问题。在这里，我们报告了嵌入氮掺杂石墨碳纳米管 (CoNi@N-GCNT-FD) 电催化剂中的 CoNi 合金纳米颗粒，该电催化剂由金属前体和通过冷冻干燥预处理形成的双氰胺纳米纤维合成。电催化剂表现出显着的 ORR 性能（0.90 V 对可逆氢电极 (RHE) 的正起始电位、0.84 V 对 RHE 的半波电位和高极限电流密度 (6.4 mA cm ^–2)) 在碱性介质中。突出的 ORR 催化行为归因于具有高比表面积的特性以及 CoNi 合金和纳米管保护层之间的协同影响。CoNi@N-GCNT-FD 还表现出抗甲醇毒性和超过 10,000 次循环的良好稳定性，这归因于 N-GCNT 的独特结构更有利于传质并保护合金颗粒在恶劣条件下免受腐蚀。这种简单的路线可广泛用于制备具有相对经济价值和高性能的其他合金电催化剂，在电力转换和储存装置领域。

更新日期：2021-06-21

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