以掺杂 N 的碳为载体的 CoFeZn 纳米粒子作为氧还原和氧进化的双功能催化剂

IF 5.3 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Hui-Juan Zhang*, Bo Chen, Xiaoxiong Feng, Miaomiao Yu, Jiangyu Luo and Yuhua Xue*, 
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引用次数: 0

摘要

氧还原反应(ORR)和氧进化反应(OER)是清洁能源转换装置中的两个重要反应。开发用于 ORR 和 OER 的非贵金属基双功能催化剂十分必要。在这项工作中,通过一步碳化 M-ZIF(M = Fe、Co 和 Zn)、炭黑和三聚氰胺的混合物,制备了一种多金属双功能催化剂,即掺杂 N 的碳上支撑的三金属 CoFeZn 纳米颗粒(CoFeZn/NC)。与 FeCo/NC 相比,CoFeZn/NC 具有更多的介孔结构和更高的比表面积(1029.6 m2/g),这归因于 Zn 在高温下容易挥发。此外,它还具有较高的吡啶 N(35.8%)和吡咯 N(31.1%)含量、丰富的金属活性位点,以及这些金属纳米颗粒之间较强的协同效应。与单金属催化剂(Co/NC、Fe/NC 和 Zn/NC)和双金属催化剂(CoFe/NC、FeZn/NC 和 CoZn/NC)相比,CoFeZn/NC 在 0.1 M KOH 溶液中的 ORR 峰电位为 0.90 V(相对于 RHE),半波电位为 0.87 V(相对于 RHE),并具有优异的稳定性和耐甲醇性。对于 OER,CoFeZn/NC 在电流密度为 10 mA/cm2 时的过电位最低,为 319.9 mV,塔菲尔斜率为 82.47 mV dec-1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Nanoparticles of CoFeZn Supported on N-Doped Carbon as Bifunctional Catalysts for Oxygen Reduction and Oxygen Evolution

Nanoparticles of CoFeZn Supported on N-Doped Carbon as Bifunctional Catalysts for Oxygen Reduction and Oxygen Evolution

Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are two important reactions in clean energy conversion devices. It is necessary to develop nonprecious metal-based bifunctional catalysts for ORR and OER. In this work, a multimetal bifunctional catalyst, nanoparticles of trimetallic CoFeZn supported on N-doped carbon (CoFeZn/NC), is prepared by one-step carbonizing the mixture of M-ZIFs (M = Fe, Co, and Zn), carbon black, and melamine. CoFeZn/NC has a more mesoporous structure and a higher specific surface area of 1029.6 m2/g compared to FeCo/NC, which is attributed to the easy volatilization of Zn at high temperatures. It also has high contents of pyridinic N (35.8%) and pyrrolic N (31.1%), abundant metal active sites, and exhibits strong synergistic effects between these nanoparticles of metals. Better than the single-metal catalysts (Co/NC, Fe/NC, and Zn/NC) and bimetallic catalysts (CoFe/NC, FeZn/NC, and CoZn/NC), CoFeZn/NC has an ORR peak potential of 0.90 V (vs. RHE) and a half-wave potential of 0.87 V (vs. RHE) in 0.1 M KOH solution, and exhibits excellent stability and methanol resistance. For OER, CoFeZn/NC has the lowest overpotential of 319.9 mV at a current density of 10 mA/cm2 and a Tafel slope of 82.47 mV dec–1.

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来源期刊
CiteScore
8.30
自引率
3.40%
发文量
1601
期刊介绍: ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.
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