当前位置: X-MOL 学术Small › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Single Co‐Atoms as Electrocatalysts for Efficient Hydrazine Oxidation Reaction
Small ( IF 13.0 ) Pub Date : 2021-03-30 , DOI: 10.1002/smll.202006477
Ravishankar G. Kadam 1 , Tao Zhang 2 , Dagmar Zaoralová 1 , Miroslav Medveď 1 , Aristides Bakandritsos 1, 3 , Ondřej Tomanec 4 , Martin Petr 1 , Johnny Zhu Chen 5 , Jeffrey T. Miller 5 , Michal Otyepka 4 , Radek Zbořil 4, 5 , Tewodros Asefa 2, 6 , Manoj B. Gawande 1, 7
Affiliation  

Single‐atom catalysts (SACs) have aroused great attention due to their high atom efficiency and unprecedented catalytic properties. A remaining challenge is to anchor the single atoms individually on support materials via strong interactions. Herein, single atom Co sites have been developed on functionalized graphene by taking advantage of the strong interaction between Co2+ ions and the nitrile group of cyanographene. The potential of the material, which is named G(CN)Co, as a SAC is demonstrated using the electrocatalytic hydrazine oxidation reaction (HzOR). The material exhibits excellent catalytic activity for HzOR, driving the reaction with low overpotential and high current density while remaining stable during long reaction times. Thus, this material can be a promising alternative to conventional noble metal‐based catalysts that are currently widely used in HzOR‐based fuel cells. Density functional theory calculations of the reaction mechanism over the material reveal that the Co(II) sites on G(CN)Co can efficiently interact with hydrazine molecules and promote the NH bond‐dissociation steps involved in the HzOR.

中文翻译:

单一共原子作为高效肼氧化反应的电催化剂

单原子催化剂(SAC)由于其高原子效率和空前的催化性能而备受关注。剩下的挑战是通过强大的相互作用将单个原子单独锚固在支撑材料上。在此,通过利用Co 2+离子与氰基石墨烯的腈基之间的强相互作用,在官能化的石墨烯上开发了单原子的Co位点。材料的电势,称为G(CN)使用电催化肼氧化反应(HzOR)证明了Co作为SAC。该材料对HzOR表现出出色的催化活性,以低过电势和高电流密度推动反应,同时在较长的反应时间内保持稳定。因此,这种材料可以作为目前广泛用于基于HzOR的燃料电池中的常规贵金属基催化剂的有前途的替代品。在该材料的反应机理的密度泛函理论计算表明,在G(CN)的钴(II)位点一氧化碳可有效地用肼分子相互作用并促进所述N个参与HzOR H键离解步骤。
更新日期:2021-04-22
down
wechat
bug