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首页> 外文期刊>RSC Advances >Three-dimensional NiCoP hollow spheres: an efficient electrode material for hydrogen evolution reaction and supercapacitor applications
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Three-dimensional NiCoP hollow spheres: an efficient electrode material for hydrogen evolution reaction and supercapacitor applications

机译：三维Nicop中空球体：用于氢化反应和超级电容器应用的有效电极材料

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摘要

A binary metal phosphide (NiCoP) has been synthesized in a single-step hydrothermal method, and its energy conversion (hydrogen evolution reaction; HER) and energy storage (supercapacitor) performances have been explored. The physicochemical characterization of the NiCoP nanostructures show that they have a highly crystalline phase and are formed uniformly with a sphere-like surface morphology. In acidic electrolytic conditions, the NiCoP shows excellent HER performance, requiring only 160 and 300 mV overpotential to deliver 10 and 300 mA cm ~(?2) current density, respectively. Interestingly, it follows the Volmer–Heyrovsky reaction pathway to execute the HER with robust durability (～15 mV increase in overpotential even after 18 h of electrolysis). In an alkaline medium (5 M KOH), NiCoP shows specific capacitance of 960 F g ~(?1) with higher energy density (33.3 W h kg ~(?1) ) and power density (11.8 kW kg ~(?1) ). Moreover, it shows better reversibility (～97% coulombic efficiency) and long cycle life (～95% capacitance retention after 10?000 repeated cycles). The unique surface morphology and phase purity of the binary metal phosphide avails more electroactive surface/redox centers, thereby showing better electrocatalytic as well as energy storage performances. Therefore, we presume that the NiCoP would be a suitable material for future energy conversion and storage systems.
机译：已经在单步水热法中合成二元金属磷化物（NiCOP），并探讨了其能量转换（氢化反应;她）和储能（超级电容器）性能。 Nicop纳米结构的物理化学表征表明它们具有高结晶相，并且用球形表面形态均匀地形成。在酸性电解条件下，NiCOP显示出优异的性能，仅需要160和300mV的过电位，分别输送10和300mA cm〜（Δ2）电流密度。有趣的是，它遵循Volmer-Heyrovsky反应途径，以稳健的耐久性（即使在18小时后，过电压在电解后的过电量〜15mV）。在碱性培养基（5M KOH）中，NiCOP显示出960 f G〜（α1）的特定电容，能量密度较高（33.3 W H kg〜（α1））和功率密度（11.8kg kg〜（？1） ）。此外，它显示出更好的可逆性（〜97％的库仑效率）和长循环寿命（10 000次重复循环后的电容保留〜95％）。二元金属磷化物的独特表面形态和相纯度可利用更多的电活性表面/氧化还原中心，从而显示出更好的电催化以及能量存储性能。因此，我们认为Nicop将是未来能量转换和存储系统的合适材料。

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