Self‐Templated Fabrication of MoNi4/MoO3‐x Nanorod Arrays with Dual Active Components for Highly Efficient Hydrogen Evolution,Advanced Materials

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Self‐Templated Fabrication of MoNi4/MoO3‐x Nanorod Arrays with Dual Active Components for Highly Efficient Hydrogen Evolution
Advanced Materials ( IF 27.4 ) Pub Date : 2017-08-18 , DOI: 10.1002/adma.201703311
Yu-Yun Chen _{1,

2} , Yun Zhang _{2,

3} , Xing Zhang ₂ , Tang Tang ₂ , Hao Luo ₂ , Shuai Niu ₂ , Zhi-Hui Dai ₁ , Li-Jun Wan _{2,

4} , Jin-Song Hu _{2,

4}

Affiliation

A binder‐free efficient MoNi₄/MoO_3‐_x nanorod array electrode with 3D open structure is developed by using Ni foam as both scaffold and Ni source to form NiMoO₄ precursor, followed by subsequent annealing in a reduction atmosphere. It is discovered that the self‐templated conversion of NiMoO₄ into MoNi₄ nanocrystals and MoO_3‐_x as dual active components dramatically boosts the hydrogen evolution reaction (HER) performance. Benefiting from high intrinsic activity, high electrochemical surface area, 3D open network, and improved electron transport, the resulting MoNi₄/MoO_3‐_x electrode exhibits a remarkable HER activity with extremely low overpotentials of 17 mV at 10 mA cm⁻² and 114 mV at 500 mA cm⁻², as well as a superior durability in alkaline medium. The water–alkali electrolyzer using MoNi₄/MoO_3‐_x as cathode achieves stable overall water splitting with a small cell voltage of 1.6 V at 30 mA cm⁻². These findings may inspire the exploration of cost‐effective and efficient electrodes by in situ integrating multiple highly active components on 3D platform with open conductive network for practical hydrogen production.

中文翻译：

具有双重活性成分的MoNi4 / MoO3-x纳米棒阵列的自模板制备，可高效释放氢气

通过使用泡沫镍和镍源共同形成NiMoO ₄前驱体，开发了具有3D开放结构的高效无粘结剂MoNi ₄ / MoO _3-_x纳米棒阵列电极，随后在还原气氛中进行退火。人们发现，NiMoO ₄自我模板化转化为MoNi ₄纳米晶体和MoO _3-_x作为双重活性成分，极大地提高了析氢反应（HER）的性能。得益于高固有活性，高电化学表面积，3D开放网络和改善的电子传输，所得的MoNi ₄ / MoO _3-_x电极具有卓越的HER活性，在10 mA cm ^-2时极低的过电势（17 mV）和在500 mA cm ^-2时极低的过电势，在碱性介质中具有出色的耐久性。使用MoNi ₄ / MoO _3-_x作为阴极的水碱性电解槽可在30 mA cm ^-^2下以1.6 V的小电池电压实现稳定的总水分解。这些发现可能通过将3D平台上的多个高活性成分与开放式导电网络原位集成以实际生产氢气来激发对经济高效电极的探索。

更新日期：2017-08-18

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