Pulsed Electrodeposition of Co3 O4 Nanocrystals on One-Dimensional ZnO Scaffolds for Enhanced Electrochemical Water Oxidation.,ChemPlusChem

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Pulsed Electrodeposition of Co3 O4 Nanocrystals on One-Dimensional ZnO Scaffolds for Enhanced Electrochemical Water Oxidation.
ChemPlusChem ( IF 3.0 ) Pub Date : 2018-08-24 , DOI: 10.1002/cplu.201800218
Hao Wu ₁ , Shangyi Li ₂ , Xinxin Lu ₁ , Cui Ying Toe ₁ , Hoi Ying Chung ₁ , Yiming Tang ₂ , Xunyu Lu ₁ , Rose Amal ₁ , Laisheng Li ₂ , Yun Hau Ng ₁

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Pulsed electrodeposition has been introduced to deposit ultrathin flakes of Co3 O4 nanocrystals on ZnO nanorods. By fixing the seeding process, the scaffolding function of ZnO nanorods was studied by varying deposition times (30 s, 60 s, and 90 s) of Co3 O4 at a nucleation current of -1.0 mA cm-2 . The amount of deposited Co3 O4 has a strong influence on the oxygen evolution performance with ZnO scaffolds. To deliver a current density of 10.0 mA cm-2 in neutral solutions (0.5 M K2 SO4 ), the presence of ZnO scaffold electrodes negatively shifted the overpotential by ∼200 mV. In particular, the Co3 O4 /ZnO hybrid nanostructured electrode (60 s) exhibits the lowest onset potential of 1.5 V (vs. reversible hydrogen electrode, RHE). Electrochemical impedance spectra and double layer capacitance showed that the enhanced oxygen evolution activities originated from the improved charge transfer capability and the increased electrochemically active interface between Co3 O4 and ZnO.

中文翻译：

一维ZnO支架上Co3 O4纳米晶体的脉冲电沉积以增强电化学水氧化。

已经引入脉冲电沉积以在ZnO纳米棒上沉积Co3 O4纳米晶体的超薄薄片。通过固定播种过程，通过改变成核电流为-1.0 mA cm-2的Co3 O4的沉积时间（30 s，60 s和90 s）来研究ZnO纳米棒的支架功能。Co3 O4的沉积量对使用ZnO支架的氧气释放性能有很大影响。为了在中性溶液（0.5 M K2 SO4）中提供10.0 mA cm-2的电流密度，ZnO支架电极的存在使过电势负移了约200 mV。尤其是，Co3O4 / ZnO杂化纳米结构电极（60 s）表现出最低的启动电位1.5 V（vs。可逆氢电极，RHE）。

更新日期：2018-08-24

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