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首页> 外文期刊>RSC Advances >Probing oxygen reduction and oxygen evolution reactions on bifunctional non-precious metal catalysts for metal–air batteries
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Probing oxygen reduction and oxygen evolution reactions on bifunctional non-precious metal catalysts for metal–air batteries

机译：探测金属电池双官能非贵金属催化剂的氧气还原和氧气进化反应

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Non-precious metal (NPM) catalysts comprising cobalt and N-doped multiwalled carbon nanotubes (N-MWCNTs-Co) were synthesized by the solid-state pyrolysis (SSP) of melamine with Co _(3) O _(4) . N-MWCNTs-Co acts as an electrocatalyst for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), and hence can be used in secondary metal–air batteries and in unitized regenerative fuel cells. It is important to study the OER and ORR at high concentrations of KOH as most of the metal–air batteries employ KOH concentrations > 4 M. The OER potential of N-MWCNTs-Co at a current density of 10 mA cm ~(?2) was 0.6 V vs. Hg/HgO (corresponding to an overpotential of 0.364 V) in 6 M KOH. The activity towards the ORR of N-MWCNTs-Co at ?0.1 V vs. Hg/HgO was 2.7 and 0.2 mA cm ~(?2) in 0.1 M and 6 M KOH respectively. Based on our ORR, OER and impedance studies, we postulate that the non-covalent interactions between the hydrated alkali metal cations and the adsorbed oxygen-based species on the catalyst surface are responsible for the reduction in ORR activity and enhancement in OER activity with increasing KOH concentration. Finally, we provide our initial results using this bifunctional catalyst in a zinc–air battery.
机译：通过Co _（3）O _（4）的三聚氰胺的固态热解（SSP）合成包含钴和N掺杂多晶碳纳米管（N-MWCNTS-CO）的非贵金属（NPM）催化剂。 N-MWCNTS-Co用作氧还原反应（ORR）和氧气进化反应（OER）的电催化剂，因此可用于二次金属 - 空气电池和单位化的再生燃料电池中。重要的是在高浓度的KOH中研究OER和ORR，因为大多数金属电池采用KOH浓度> 4米。N-MWCNTS-CO的OER电位，电流密度为10 mA cm〜（？2 ）在6M KOH中为0.6V与Hg / HgO（对应于0.364 V的过电位）。在0.1M和6M KOH中，朝向N-MWCNTS-Co的ORR的活性分别为2.7和0.2 mA CM〜（Δ2）。基于我们的ORR，OER和阻抗研究，我们假设水合碱金属阳离子与催化剂表面上的吸附氧基物质之间的非共价相互作用负责，并且随着众所周央，oer活动的增强负责酸浓度。最后，我们在锌空气电池中使用该双功能催化剂提供了我们的初始结果。

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