Spherical Sacrificial ZnO Template–Derived Hybrid Ni/Co3O4 Cubes as Efficient Bifunctional Electrocatalyst for Overall Water Splitting,Energy Technology

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Spherical Sacrificial ZnO Template–Derived Hybrid Ni/Co3O4 Cubes as Efficient Bifunctional Electrocatalyst for Overall Water Splitting
Energy Technology ( IF 3.6 ) Pub Date : 2020-01-30 , DOI: 10.1002/ente.201901310
Muhammad Sohail Riaz _{1,

2} , Siwei Zhao _{1,

2} , Chenlong Dong _{1,

2} , Muhammad Javed Iqbal ₃ , Yantao Zhao _{1,

2} , Fuqiang Huang _{1,

2}

Affiliation

Heterostructure transition metal derivatives have been extensively studied in electrocatalysis, but most of the hybrid samples are on nanoscale with low stability and tap density. ZnO microspheres are applied as a sacrificial template, followed by alkaline etching and aluminum reduction to construct Ni/Co₃O₄ microcubes. The porous hybrid microcubes show stirring performance in both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). For HER, it exhibits comparable overpotential of 145 mV at 10 mA cm⁻² as Pt/C (101 mV) and desirable stability. For OER, it outperforms RuO₂ with lower overpotential when the current exceeds 17.8 mA cm⁻² and much smaller Tafel slope of 34 mV dec⁻¹ versus RuO₂ (72 mV dec⁻¹). The potential activity is assigned to the charge transfer at the heterointerfaces, and the synergic effects of the Ni/Co₃O₄ phases, which possibly will cast light on the design of microscale bifunctional electrocatalysts.

中文翻译：

球形牺牲ZnO模板衍生的混合Ni / Co3O4立方体作为有效的双功能电催化剂，可用于总水分解

异质结构过渡金属衍生物已经在电催化中进行了广泛的研究，但是大多数杂化样品是纳米级的，具有低稳定性和振实密度。ZnO微球用作牺牲模板，然后进行碱蚀刻和铝还原，以构建Ni / Co ₃ O ₄微立方体。多孔杂化微粒在氢气析出反应（HER）和氧气析出反应（OER）中均显示搅拌性能。对于HER，它在10 mA cm ^-2下表现出与Pt / C（101 mV）相当的145 mV的过电势和所需的稳定性。对于OER，当电流超过17.8 mA cm ^-2且Tafel斜率更小时为34 mV dec ^-1时，它的过电位低于RuO ₂相对于RuO ₂（72mV dec ^-1）。潜在的活性被分配给异质界面上的电荷转移，以及Ni / Co ₃ O ₄相的协同效应，这可能会为微型双功能电催化剂的设计提供参考。

更新日期：2020-01-30

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