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首页> 外文期刊>Nanotechnology >Cobalt hydroxide nanoflakes and their application as supercapacitors and oxygen evolution catalysts
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Cobalt hydroxide nanoflakes and their application as supercapacitors and oxygen evolution catalysts

机译：氢氧化钴纳米蛋糕及其作为超级电容器和氧气进化催化剂的应用

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摘要

Finding alternative routes to access and store energy has become a major issue recently. Transition metal oxides have shown promising behaviour as catalysts and supercapacitors. Recently, liquid exfoliation of bulk metal oxides appears to be an effective route which provides access to two-dimensional (2D) nano-flakes, the size of which can be easily selected. These 2D materials exhibit excellent electrochemical charge storage and catalytic activity for the oxygen evolution reaction. In this study, various sized selected cobalt hydroxide nano-flake materials are fabricated by this time efficient and highly reproducible process. Subsquently, the electrochemical properties of the standard size Co(OH)(2) nanoflakes were investigated. The oxide modified electrodes were prepared by spraying the metal oxide flake suspension onto a porous conductive support electrode foam, either glassy carbon or nickel. The cobalt hydroxide/nickel foam system was found to have an overpotential value at 10 mA cm(-2) in 1 M NaOH as low as 280mV and an associated redox capacitance exhibiting numerical values up to 1500 Fg(-1),thereby making it a viable dual use electrode.
机译：找到访问和存储能源的替代路线已成为最近的一个主要问题。过渡金属氧化物已显示有前途的行为作为催化剂和超级电容器。最近，散装金属氧化物的液体剥离似乎是提供对二维（2D）纳米片的通行的有效途径，其尺寸可以容易地选择。这些2D材料表现出优异的电化学电荷储存和氧气进化反应的催化活性。在该研究中，通过该时间效率和高度可重复的方法制造各种尺寸的氢氧化钴纳米片材料。自行，研究了标准尺寸Co（OH）（2）纳米薄薄蛋白的电化学性质。通过将金属氧化物薄片悬浮液喷射到多孔导电支撑电极泡沫，任一玻璃碳或镍来制备氧化物改性电极。发现氢氧化钴/镍泡沫系统在10mA naOh中具有10 mA cm（-2）的过电值，低至280mV，并且相关的氧化还原电容表现出高达1500 fg（-1）的数值，从而制造可行的双用电极。

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