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首页> 外文期刊>Chemistry: A European journal >Synthesis of Highly Active and Stable Spinel-Type Oxygen Evolution Electrocatalysts by a Rapid Inorganic Self-Templating Method
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Synthesis of Highly Active and Stable Spinel-Type Oxygen Evolution Electrocatalysts by a Rapid Inorganic Self-Templating Method

机译：快速无机自模板法合成高活性和稳定的尖晶石型析氧电催化剂

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摘要

Composition-adjustable spinel-type metal oxides, Mn_xCo_(3-x)O_(4-δ) (x=0.8–1.4), were synthesized in ethanol solutions by a rapid inorganic self-templating mechanism using KCl nanocrystals as the structure-directing agent. The Mn_xCo_(3-x)O_(4-δ) materials showed ultrahigh oxygen evolution activity and strong durability in alkaline solutions, and are capable of delivering a current density of 10 mAcm~(-2) at 1.58 V versus the reversible hydrogen electrode in 0.1m KOH solution, which is superior in comparison to IrO_2 catalysts under identical experimental conditions, and comparable to the most active noble-metal and transition-metal oxygen evolution electrocatalysts reported so far. The high performance for catalytic oxygen evolution originates from both compositional and structural features of the synthesized materials. The moderate content of Mn doping into the spinel framework led to their improved electronic conductivity and strong oxidizing ability, and the well-developed porosity, accompanied with the high affinity between OH~- reactants and catalyst surface, contributed to the smooth mass transport, thus endowing them with superior oxygen evolution activity.
机译：成分可调的尖晶石型金属氧化物Mn_xCo_（3-x）O_（4-δ）（x = 0.8–1.4），通过快速无机自模板机理，以KCl纳米晶体为结构导向，在乙醇溶液中合成。代理商。 Mn_xCo_（3-x）O_（4-δ）材料在碱性溶液中表现出超高的析氧活性和较强的耐久性，并且相对于可逆氢电极，在1.58 V的电压下能够提供10 mAcm〜（-2）的电流密度在0.1m KOH溶液中，在相同的实验条件下，它比IrO_2催化剂优越，并且可与迄今为止报道的活性最高的贵金属和过渡金属氧逸出电催化剂媲美。催化氧放出的高性能源自合成材料的组成和结构特征。掺入尖晶石骨架的锰含量适中，从而改善了它们的电子导电性和强氧化能力，并且良好的孔隙率以及OH〜-反应物与催化剂表面之间的高亲和力有助于平稳的质量传递，因此使它们具有出色的析氧活性。

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