Construction of hierarchical Ni–Co–P hollow nanobricks with oriented nanosheets for efficient overall water splitting†,Energy & Environmental Science

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Construction of hierarchical Ni–Co–P hollow nanobricks with oriented nanosheets for efficient overall water splitting†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-03-12 00:00:00 , DOI: 10.1039/c8ee00076j
Enlai Hu _{1,

2,

3,

4,

5} , Yafei Feng _{1,

2,

3,

4,

5} , Jianwei Nai _{6,

7,

8,

9} , Dian Zhao _{1,

2,

3,

4,

5} , Yong Hu _{1,

2,

3,

4,

5} , Xiong Wen (David) Lou _{6,

7,

8,

9}

Affiliation

Complex nano-architectures with ordered two-dimensional (2D) building blocks are a class of promising electrocatalysts for different electrochemical technologies. In this work, a novel template-engaged strategy followed by sequential etching and phosphorization treatments is demonstrated to fabricate open and hierarchical Ni–Co–P hollow nanobricks (HNBs) via the assembly of oriented 2D nanosheets. Benefiting from the unique nano-architectures with large electrolyte-accessible surface and abundant mass diffusion pathways, the as-prepared Ni–Co–P HNBs exhibit high electrocatalytic activity, which affords the current density of 10 mA cm⁻² at low overpotentials of 270 mV and 107 mV for oxygen and hydrogen evolution reactions respectively, and excellent stability in an alkaline medium. Remarkably, when used as both the anode and cathode, a low cell voltage of 1.62 V is required to reach the current density of 10 mA cm⁻², making the Ni–Co–P HNBs an efficient bifunctional electrocatalyst for overall water splitting.

中文翻译：

带有定向纳米片的分层Ni-Co-P空心纳米砖的构建，可实现有效的总水分解†

具有有序二维（2D）构建基块的复杂纳米结构是一类有前景的用于不同电化学技术的电催化剂。在这项工作中，展示了一种新颖的模板接合策略，随后进行顺序蚀刻和磷化处理，可通过定向2D纳米片的组装来制造开放且分层的Ni-Co-P空心纳米砖（HNB）。得益于独特的纳米结构，具有可接触电解质的大表面和丰富的质量扩散途径，所制备的Ni-Co-P HNB具有高电催化活性，可提供10 mA cm ^-2的电流密度分别在270 mV和107 mV的低超电势下进行氧气和氢气的放出反应，并在碱性介质中具有出色的稳定性。值得注意的是，当同时用作阳极和阴极时，需要达到1.62 V的低电池电压才能达到10 mA cm ^-2的电流密度，从而使Ni-Co-P HNBs成为有效的双功能电催化剂，可用于总水分解。

更新日期：2018-03-12

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