Achievement of an efficient oxygen reduction electrocatalyst based on carbon boosted with MnOx/MnCo2O4 with excellent electrocatalytic activity in neutral media

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2023-09-05 DOI:10.1007/s42823-023-00599-9

Masoumeh Ghalkhani, Rasol Abdullah Mirzaie, Fatemeh Shahmoradi, Azam Anaraki Firooz

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Abstract

In the current research, a manganese and cobalt oxides-based nanocatalyst was developed which was used to make an efficient cathode electrode for fuel cells. The nano MnO_x/MnCo₂O₄ was synthesized through a hydrothermal procedure followed by sintering at 500–600 °C. X-ray diffraction and scanning electron microscopy besides electrochemical techniques were applied for the characterization of the synthesized nanocatalyst. The carbon black type Vulcan (XC-72R) and PTFE were used to prepare the active reaction material of the cathode electrode named carbon paste (CP). Loading of the synthesized nano MnO_x/MnCo₂O₄ on CP was optimized in a weight ratio of 10–90% for the oxygen reduction process in neutral conditions. The best performance was gained for the 50 W% MnO_x/MnCo₂O₄ loaded CP, whose active surface area was twice the bare CP. The values of the exchange current density of the ORR obtained by electrode containing 50 W% MnO_x/MnCo₂O₄ was calculated as 0.12 mA/cm². The low price, good catalytic efficiency, and cyclic stability of the MnO_x/MnCo₂O₄ nanocatalyst compared to the commercial platinum-based catalysts confirm its ability to develop fuel cell electrodes.

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在中性介质中实现具有优异电催化活性的MnOx/MnCo2O4增强碳基高效氧还原电催化剂

目前的研究开发了一种基于锰和钴氧化物的纳米催化剂，用于制造燃料电池的高效阴极电极。纳米 MnOx/MnCo2O4 是通过水热法合成的，然后在 500-600 °C 下烧结。除了电化学技术外，还采用了 X 射线衍射和扫描电子显微镜来表征合成的纳米催化剂。使用 Vulcan (XC-72R) 型炭黑和聚四氟乙烯制备阴极电极的活性反应材料，命名为炭浆（CP）。在中性条件下进行氧还原过程时，合成的纳米 MnOx/MnCo2O4 在 CP 上的负载量按 10-90% 的重量比进行了优化。负载 50 W% MnOx/MnCo2O4 的 CP 性能最佳，其活性表面积是裸 CP 的两倍。经计算，含 50 W% MnOx/MnCo2O4 的电极在 ORR 中的交换电流密度值为 0.12 mA/cm2。与商用铂基催化剂相比，MnOx/MnCo2O4 纳米催化剂具有价格低廉、催化效率高和循环稳定性好等优点，这证实了它开发燃料电池电极的能力。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.