Mesoporous Fe-Nx-C Sub-Microspheres for Highly Efficient Electrocatalytic Oxygen Reduction Reaction,ChemCatChem

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Mesoporous Fe-Nx-C Sub-Microspheres for Highly Efficient Electrocatalytic Oxygen Reduction Reaction
ChemCatChem ( IF 3.8 ) Pub Date : 2021-07-12 , DOI: 10.1002/cctc.202100842
Youlin Liu ₁ , Jinjiang Liu ₂ , Meimei Wang ₃ , Yuesong Shen ₄ , Shipin Yang ₅ , Dongyan Li ₃

Affiliation

We design and obtain mesoporous Fe-N_x-C sub-microspheres (Meso Fe-N_x-C-SS) using the amino acid-metal complex as Fe/N/C precursor and mesoporous silica sub-microspheres (MSS) as hard template by a facile template-assistance strategy. The Histidine-Fe complex is impregnated into mesopores of MSS, and then Meso Fe-N_x-C-SS are obtained by high-temperature carbonization process and removal of MSS template. The as-fabricated Meso Fe-N_x-C-SS exhibits the spherical structure with rough surface with the diameter size of 200–500 nm. And Meso Fe-N_x-C-SS also possesses a high specific surface area of 784 m² g⁻¹, a large pore volume of 1.65 cm³ g⁻¹, and a large pore size in the range of 10–22 nm. Benefiting from atomically dispersed N-coordinated Fe and unique three-dimensionally (3D) interconnected mesoporous carbon architecture, Meso Fe-N_x-C-SS shows excellent electrocatalytic performance toward oxygen reduction reaction (ORR) with positive half-wave potential (E_1/2 0.86 V), high stability (93.94 % after 30,000 s), low Tafel slop (43 mV dec⁻¹) and good methanol tolerance, exceeding commercial Pt/C catalyst in alkaline media. As the cathode catalyst within the primary Zn-air batteries, Meso Fe-N_x-C-SS also reveals an outstanding catalytic activity (the maximum power density of 120 mW cm⁻²) and superior discharge stability (at current density of 10 mA cm⁻² after 6 cycles, at different current densities of 5, 10, 20 mA cm⁻²), promoting its practical application in Zn-air batteries.

中文翻译：

用于高效电催化氧还原反应的介孔 Fe-Nx-C 亚微球

我们设计并获得了介孔 Fe-N _x -C 亚微球 (Meso Fe-N _x -C-SS) 使用氨基酸-金属配合物作为 Fe/N/C 前体和介孔二氧化硅亚微球 (MSS) 作为硬模板通过简单的模板辅助策略。将组氨酸-铁配合物浸渍到MSS的介孔中，然后通过高温碳化工艺去除MSS模板得到Meso Fe-N _x -C-SS。制造的 Meso Fe-N _x -C-SS 呈现球形结构，表面粗糙，直径为 200-500 nm。并且Meso Fe-N _x -C-SS 还具有784 m ² g ^-1的高比表面积，1.65 cm ³的大孔体积 g ^-1，以及在 10-22 nm 范围内的大孔径。受益于原子分散的 N 配位 Fe 和独特的三维 (3D) 互连介孔碳结构，Meso Fe-N _x -C-SS 对具有正半波电位 (E ₁ ) 的氧还原反应 (ORR) 显示出优异的电催化性能_/2 0.86 V)、高稳定性（30,000 秒后为 93.94 %）、低 Tafel slop（43 mV dec ^-1）和良好的甲醇耐受性，在碱性介质中超过商业 Pt/C 催化剂。作为一次锌空气电池中的阴极催化剂，Meso Fe-N _x -C-SS 还显示出出色的催化活性（最大功率密度为 120 mW cm ^-2)和优异的放电稳定性（6次循环后电流密度为10 mA cm ^-2，电流密度为5、10、20 mA cm ^-2），促进了其在锌空气电池中的实际应用。

更新日期：2021-09-17

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