Modulation of Single Atomic Co and Fe Sites on Hollow Carbon Nanospheres as Oxygen Electrodes for Rechargeable Zn–Air Batteries,Small Methods

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Modulation of Single Atomic Co and Fe Sites on Hollow Carbon Nanospheres as Oxygen Electrodes for Rechargeable Zn–Air Batteries
Small Methods ( IF 10.7 ) Pub Date : 2020-10-09 , DOI: 10.1002/smtd.202000751
Vishal Jose _{1,

2} , Huimin Hu ₃ , Eldho Edison ₄ , William Manalastas ₄ , Hao Ren ₄ , Pinit Kidkhunthod ₅ , Sivaramapanicker Sreejith ₆ , Anjali Jayakumar ₇ , Jean Marie Vianney Nsanzimana ₂ , Madhavi Srinivasan ₄ , Jinho Choi ₃ , Jong-Min Lee ₂

Affiliation

Efficient bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are required for metal air batteries, to replace costly metals, such as Pt and Ir/Ru based compounds, which are typically used as benchmarks for ORR and OER, respectively. Isolated single atomic sites coordinated with nitrogen on carbon supports (M‐N‐C) have promising performance for replacement of precious metal catalysts. However, most of monometallic M‐N‐C catalysts demonstrate unsatisfactory bifunctional performance. Herein, a facile way of preparing bimetallic Fe and Co sites entrapped in nitrogen‐doped hollow carbon nanospheres (Fe,Co‐SA/CS) is explored, drawing on the unique structure and pore characteristics of Zeolitic imidazole frameworks and molecular size of Ferrocene, an Fe containing species. Fe,Co‐SA/CS showed an ORR onset potential and half wave potential of 0.96 and 0.86 V, respectively. For OER, (Fe,Co)‐SA/CS attained its anodic current density of 10 mA cm^–2 at an overpotential of 360 mV. Interestingly, the oxygen electrode activity (ΔE) for (Fe,Co)‐SA/CS and commercial Pt/C‐RuO₂ is calculated to be 0.73 V, exhibiting the bifunctional catalytic activity of (Fe,Co)‐SA/CS. (Fe,Co)‐SA/CS evidenced desirable specific capacity and cyclic stability than Pt/C‐RuO2 mixture when utilized as an air cathode in a homemade Zinc‐air battery.

中文翻译：

中空碳纳米球上单原子 Co 和 Fe 位点的调制作为可充电锌空气电池的氧电极

金属空气电池需要用于氧还原反应 (ORR) 和析氧反应 (OER) 的高效双功能电催化剂，以替代昂贵的金属，例如 Pt 和 Ir/Ru 基化合物，它们通常用作 ORR 和 OER 的基准，分别。与碳载体上的氮（M-N-C）配位的孤立单原子位点在替代贵金属催化剂方面具有良好的性能。然而，大多数单金属 M-N-C 催化剂的双功能性能并不令人满意。在此，利用沸石咪唑骨架的独特结构和孔隙特征以及二茂铁的分子尺寸，探索了一种制备夹带在氮掺杂中空碳纳米球（Fe，Co-SA/CS）中的双金属 Fe 和 Co 位点的简便方法，一种含 Fe 的物种。铁，Co-SA/CS 的 ORR 起始电位和半波电位分别为 0.96 V 和 0.86 V。对于 OER，(Fe,Co)-SA/CS 的阳极电流密度达到 10 mA cm^–2过电位为 360 mV。有趣的是，(Fe,Co)-SA/CS 和商业 Pt/C-RuO ₂的氧电极活性 (Δ E )计算为 0.73 V，表现出 (Fe,Co)-SA/CS 的双功能催化活性. 在自制锌空气电池中用作空气阴极时，(Fe,Co)-SA/CS 证明了比 Pt/C-RuO2 混合物更理想的比容量和循环稳定性。

更新日期：2020-10-09

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