Facile synthesis of nickel–copper hollow spheres as efficient bifunctional electrocatalysts for overall water splitting,Materials Chemistry Frontiers

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Facile synthesis of nickel–copper hollow spheres as efficient bifunctional electrocatalysts for overall water splitting
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020/01/31 , DOI: 10.1039/c9qm00697d
Lifeng Lin _{1,

2,

3,

4} , Min Chen _{1,

2,

3,

4} , Limin Wu _{1,

2,

3,

4}

Affiliation

Sustainable energy conversion has motivated researchers to design and develop novel efficient bifunctional electrocatalysts for water splitting. In this work, we report the facile synthesis of Ni_xCu_y@C hollow spheres by using a template-free strategy. The activities of the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) are significantly enhanced by the hollow structure and optimal composition. The as-synthesized Ni₄Cu₂@C hollow spheres exhibit superior HER performance with overpotentials of 55 and 91 mV at 10 mA cm⁻² in alkaline and acidic media, and the low overpotential of 280 mV at 10 mA cm⁻² for the OER in alkaline media. When Ni₄Cu₂@C hollow spheres are employed as electrocatalysts for both the anode and cathode in an overall water splitting system, a cell voltage of only 1.49 V at 15 mA cm⁻² and long-term durability (50 h@40 mA cm⁻²) are achieved.

中文翻译：

轻松合成镍-铜空心球，作为有效的双功能电催化剂，用于总水分解

可持续的能源转换促使研究人员设计和开发新颖的高效双功能水分解电催化剂。在这项工作中，我们报告了通过使用无模板策略容易地合成Ni _x Cu _y @C空心球的方法。空心结构和最佳组成显着增强了析氢反应（HER）和析氧反应（OER）的活性。所合成的Ni ₄的Cu ₂ @C空心球表现出优良的HER为55的超电势和91毫伏在10mA厘米性能^-2在碱性和酸性介质中，和低超电势280毫伏在10mA厘米^-2的在碱性介质中的OER。当镍₄在整个水分解系统中，Cu ₂ @C中空球体被用作阳极和阴极的电催化剂，在15 mA cm ^-2时电池电压仅为1.49 V，长期耐用性（50 h @ 40 mA cm ^-2））达成。

更新日期：2020-03-05

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