Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, P. R. China.
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology and CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, 2 North first Street, Zhongguancun, Beijing, 100190, China.
Adv Mater. 2017 Oct;29(39). doi: 10.1002/adma.201703311. Epub 2017 Aug 18.
A binder-free efficient MoNi /MoO nanorod array electrode with 3D open structure is developed by using Ni foam as both scaffold and Ni source to form NiMoO precursor, followed by subsequent annealing in a reduction atmosphere. It is discovered that the self-templated conversion of NiMoO into MoNi nanocrystals and MoO 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 MoNi /MoO electrode exhibits a remarkable HER activity with extremely low overpotentials of 17 mV at 10 mA cm and 114 mV at 500 mA cm , as well as a superior durability in alkaline medium. The water-alkali electrolyzer using MoNi /MoO as cathode achieves stable overall water splitting with a small cell voltage of 1.6 V at 30 mA cm . 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.
一种无粘结剂的高效 MoNi/MoO 纳米棒阵列电极，具有 3D 开放式结构，是通过将 Ni 泡沫用作支架和 Ni 源来形成 NiMoO 前体，然后在还原气氛中进行后续退火而开发的。研究发现，NiMoO 的自模板转化为 MoNi 纳米晶和 MoO 作为双活性组分，极大地提高了析氢反应（HER）性能。由于具有高本征活性、高电化学表面积、3D 开放式网络和改善的电子传输，所得的 MoNi/MoO 电极表现出优异的 HER 活性，在 10 mA cm 时过电位极低，为 17 mV，在 500 mA cm 时为 114 mV，在碱性介质中具有出色的耐久性。以 MoNi/MoO 作为阴极的水电解槽在 30 mA cm 时实现了稳定的整体水分解，电池电压仅为 1.6 V。这些发现可能会激发人们通过在具有开放式导电网络的 3D 平台上原位集成多个高活性组分，为实际的制氢探索出具有成本效益和高效的电极。
