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首页> 外文期刊>RSC Advances >Coordination environment evolution of Co(ii) during dehydration and re-crystallization processes of KCoPO4·H2O towards enhanced electrocatalytic oxygen evolution reaction
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Coordination environment evolution of Co(ii) during dehydration and re-crystallization processes of KCoPO4·H2O towards enhanced electrocatalytic oxygen evolution reaction

机译：KCOPO4·H2O脱水脱水和再结晶过程中CO（II）的协调环境演变，促进电催化氧进化反应

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Development of efficient and stable electrodes for electrocatalytic oxygen evolution reaction (OER) is essential for energy storage and conversion applications, such as hydrogen generation from water splitting, rechargeable metal–air batteries and renewable fuel cells. Alkali metal cobalt phosphates show great potential as OER electrocatalysts. Herein, an original electrode design strategy is reported to realize an efficient OER electrocatalyst through engineering the coordination geometry of Co( II ) in KCoPO _(4) ·H _(2) O by a facile dehydration process. Experimental result indicated that the dehydration treatment is accompanied by a structural transformation from orthorhombic KCoPO _(4) ·H _(2) O to hexagonal KCoPO _(4) , involving a concomitant coordination geometry evolution of Co( II ) from octahedral to tetrahedral configuration. More significantly, the local structural evolution leads to an advantageous electronic effect, i.e. increased Co–O covalency, resulting in an enhanced intrinsic OER activity. To be specific, the as-produced KCoPO _(4) can deliver a current density of 10 mA cm ~(?2) at a low overpotential of 319 mV with a small Tafel slope of 61.8 mV dec ~(?1) in alkaline electrolyte. Thus, this present research provides a new way of developing alkali metal transition-metal phosphates for efficient and stable electrocatalytic oxygen evolution reaction.
机译：用于电催化氧气进化反应（OER）的高效稳定电极的开发对于能量储存和转化应用是必不可少的，例如来自水分裂，可充电金属 - 空气电池和可再生燃料电池的氢气。碱金属钴磷酸盐显示出欧尔电催化剂的巨大潜力。这里，据报道，据报道了原始电极设计策略通过通过容易脱水过程将Co（II）的协调几何形状来实现高效的OER电催化剂。实验结果表明，脱水处理伴随着从正交kcopo _（4）·h _（2）O至六边形Kcopo _（4）的结构转化，涉及Co（II）的伴随协调几何演变，从八面体到四面体配置。更显着，局部结构进化导致有利的电子效果，即增加了Co-O共价，导致了增强的内在oer活动。具体而言，以319mV的低过电位，在319 mV的低过电位下，在319 mV的低过电位下提供10 mA cm〜（Δ2）的电流密度，具有61.8mV DEC〜（α1）的碱性斜率电解质。因此，本研究提供了开发碱金属过渡金属磷酸盐的新方法，以便有效且稳定的电催化氧气进化反应。

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