Highly Immobilized Bimetallic Fe/M-N4 (M- Mg or Zn) Conductive Metal–Organic Frameworks on Nitrogen-Doped Porous Carbon for Efficient Electrocatalytic Hydrogen Evolution and Oxygen Reduction Reactions,Small Structures

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Highly Immobilized Bimetallic Fe/M-N4 (M- Mg or Zn) Conductive Metal–Organic Frameworks on Nitrogen-Doped Porous Carbon for Efficient Electrocatalytic Hydrogen Evolution and Oxygen Reduction Reactions
Small Structures ( IF 13.9 ) Pub Date : 2023-12-27 , DOI: 10.1002/sstr.202300355
Ravi Nivetha ₁ , Mahdieh Razi Asrami ₂ , Rajeev Kumar ₃ , Sushant Sharma _{1,

4} , Milad Jourshabani ₂ , Rajaiah Dhilip Kumar ₂ , Santhosh Ravichandran ₅ , Byeong–Kyu Lee ₂ , Youngil Lee _{3,

6} , Jin Suk Chung ₁ , Sung Gu Kang ₁ , Won Mook Choi ₁ , Seung Hyun Hur ₁

Affiliation

Herein, a simple method is proposed for developing bimetallic Fe/M-N₄/nitrogen-doped porous carbon (NPC) (M-Zn or Mg) conductive metal–organic framework (c-MOF) composites because of their great potential in replacing conventional catalysts. The prepared composite MOF exhibits remarkable catalytic activity for both hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR), surpassing the performance of the state-of-the-art transition metal-N₄ cathode catalysts. These composites demonstrate excellent selectivity for a four-electron transfer, facilitated by an associative reaction pathway that functions as the rate-determining step. Therefore, they offer high half-wave and onset potential values for ORR, i.e., 0.92 and 1.02 V for Fe/Mg-N₄-NPC (hexaminobenzene (HAB)-3@NPC) at a current density of 4.11 mA cm⁻², and 0.89 and 0.99 V for Fe/Zn-N₄-NPC (HAB-2@NPC) at a current density of 3.8 mA cm⁻², respectively. In addition, they provide low overpotentials of 21 and 64 mV at the current density of 10 mA cm⁻² with Tafel slopes of 47.9 and 34.2 mV dec⁻¹ for HER, respectively. Furthermore, when utilized as the cathode in bifunctional electrode assembly cells, they provide low cell voltages of 1.412 V at a current density of 20mA cm⁻². In the membrane electrode assembly, the HAB-3@NPC composite demonstrates an optimal power density of 0.861 Wcm⁻², thus underscoring its potential in practical applications.

中文翻译：

氮掺杂多孔碳上高度固定化的双金属 Fe/M-N4（M- Mg 或 Zn）导电金属有机框架，用于高效电催化析氢和氧还原反应

本文提出了一种开发双金属 Fe/MN ₄ /氮掺杂多孔碳（NPC）（M-Zn 或 Mg）导电金属有机骨架（c-MOF）复合材料的简单方法，因为它们在替代传统催化剂方面具有巨大潜力。所制备的复合MOF对析氢反应（HER）和氧还原反应（ORR）均表现出显着的催化活性，超越了最先进的过渡金属-N ₄ 阴极催化剂的性能。这些复合材料表现出对四电子转移的优异选择性，这得益于作为速率决定步骤的缔合反应途径。因此，它们为ORR提供高半波和起始电位值，即Fe/Mg-N _{4 -NPC（六氨基苯（HAB）-3@NPC）在4.11 mA cm}^-2的电流密度下为0.92和1.02 V Fe/Zn-N _{4 -NPC (HAB-2@NPC) 在3.8 mA cm}^-2的电流密度下分别为0.89和0.99 V。此外，它们在10 mA cm ^-2的电流密度下提供21和64 mV的低过电势，对于HER分别具有47.9和34.2 mV dec ^-1的塔菲尔斜率。^{此外，当用作双功能电极组件电池中的阴极时，它们在20mA cm -2}的电流密度下提供1.412V的低电池电压。在膜电极组件中，HAB-3@NPC复合材料表现出0.861 Wcm ^-2的最佳功率密度，从而强调了其在实际应用中的潜力。

更新日期：2023-12-27

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