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Coaxial ultrathin Co1?yFeyOx nanosheet coating on carbon nanotubes for water oxidation with excellent activity

机译:同轴超薄CO1?Yfeyox纳米纸涂层碳纳米管用于水氧化,具有优异的活性

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The rational design of high-performance and non-precious metal electrocatalysts is highly important for energy technologies. Herein, for the first time, a coaxial ultrathin Co _(1? y ) Fe _( y ) O _( x ) nanosheet coating on carbon nanotubes (denoted as Co _(1? y ) Fe _( y ) O _( x ) /CNTs) is prepared by a one-step pyrolysis method. The fabrication procedure is ultrafast and uncomplicated, furthermore, it does not need any reducing agent, alkali, or surfactant. In 1.0 M KOH, the obtained optimal hybrids Co _(0.8) Fe _(0.2) O _( x ) /CNTs _(25 wt%) catalyze oxygen evolution reactions (OER) with a very sharp onset potential (~1.45 V) and an exceptional over-potential (0.28 V, at 10 mA cm ~(?2) ) for more than 14 h, benefiting from the abundant active sites of ultrathin Co _(0.8) Fe _(0.2) O _( x ) nanosheets, the hierarchical tubular architecture, and the strong cooperative effect among Co, Fe and CNTs. Remarkably, the excellent activity and durability of Co _(0.8) Fe _(0.2) O _( x ) /CNTs _(25 wt%) for the OER is superior to commercial RuO _(2) and many other highly active precious-metal/transition-metal catalysts reported to date. The design concept for tubular iron-group binary metal nanosheet hybrids creates new pathways for energy technologies.
机译:高性能和非贵金属电催化剂的合理设计对于能源技术非常重要。在此,首次,在碳纳米管上的同轴超薄CO _(1·y)Fe _(y)o _(x)纳米晶片涂层(表示为CO _(1≤Y)FE _(Y)O _( X)/ CNT)通过一步热解方法制备。制造程序是超快和简单的,此外,它不需要任何还原剂,碱或表面活性剂。在1.0 m KOH中,所获得的最佳杂种CO _(0.8)FE _(0.2)O _(X)/ CNT _(25wt%)催化氧气演化反应(OER),具有非常急剧发作的潜力(〜1.45 V)和卓越的过电(0.28V,10 mA cm〜(β2))超过14小时,受益于超薄CO _(0.8)FE _(0.2)O _(X)纳米片的丰富活性部位,等级管状架构,以及CO,FE和CNT中的强大合作效果。值得注意的是,OER的CO _(0.8)FE _(0.2)O _(0.2)O _(x)/ CNT _(25wt%)的优异活动和耐久性优于商业若_(2)和许多其他高度活跃的珍贵 - 迄今为止报告的金属/过渡金属催化剂。管状铁组二元金属纳米液混合动力车的设计概念为能源技术创造了新的途径。

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