Bifunctional electrocatalytic CoNi-doped manganese oxide produced from microdumbbell manganese carbonate towards oxygen reduction and oxygen evolution reactions†,Sustainable Energy & Fuels

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Bifunctional electrocatalytic CoNi-doped manganese oxide produced from microdumbbell manganese carbonate towards oxygen reduction and oxygen evolution reactions†
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2018-03-23 00:00:00 , DOI: 10.1039/c8se00062j
Harnchana Gatemala _{1,

2,

3,

4,

5} , Soracha Kosasang _{1,

2,

3,

4,

5} , Montree Sawangphruk _{1,

2,

3,

4,

5}

Affiliation

Herein, a new, simple, and stabilizer-free chemical synthetic protocol of microdumbbell manganese carbonate used as a precursor for producing nanoporous metal-doped manganese oxides is reported. This is the first time that a new growth mechanism of manganese carbonate via an oriented attachment mechanism of crystalline manganese carbonate nanospheres using its ferromagnetic property is revealed. The co-precipitation of divalent metal ions can be employed for the synthesis of metal-doped manganese carbonates. As-synthesized metal carbonates were employed as templates for producing porous metal-doped manganese oxides by calcination at 500–900 °C. The retention of template morphologies and metal oxide phases can be controlled by varying the calcination temperature. Doping of manganese oxide by Co²⁺ and Ni²⁺ to form a trimetal oxide can improve the catalytic performances for the ORR and OER under alkaline conditions. In addition, the trimetal oxide shows exceptional stabilities of 95.1% and 99.6% relative current retention for the ORR and OER at 40 000 s, respectively. The catalyst produced in this work may be practically used towards the ORR and OER in many systems such as metal–air batteries.

中文翻译：

由微哑铃状碳酸锰生产的双功能电催化CoNi掺杂的锰氧化物用于氧还原和氧释放反应†

在本文中，报道了一种新的，简单的，无稳定剂的微哑铃状碳酸锰化学合成方案，该方案用作生产纳米孔金属掺杂的锰氧化物的前体。这是首次通过结晶碳酸锰纳米球的铁磁特性通过定向附着机制揭示了碳酸锰的新生长机制。二价金属离子的共沉淀可用于合成金属掺杂的碳酸锰。合成后的金属碳酸盐用作模板，通过在500–900°C下煅烧生产多孔的金属掺杂的锰氧化物。模板形态和金属氧化物相的保留可以通过改变煅烧温度来控制。Co ²⁺对氧化锰的掺杂Ni ²⁺形成三金属氧化物可以改善碱性条件下ORR和OER的催化性能。此外，三金属氧化物在40 000 s时对ORR和OER的相对电流保持率分别显示出95.1％和99.6％的出色稳定性。这项工作中产生的催化剂可在许多系统（例如金属-空气电池）中实际用于ORR和OER。

更新日期：2018-03-23

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