Integrated 3D self-supported Ni decorated MoO2 nanowires as highly efficient electrocatalysts for ultra-highly stable and large-current-density hydrogen evolution,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Integrated 3D self-supported Ni decorated MoO2 nanowires as highly efficient electrocatalysts for ultra-highly stable and large-current-density hydrogen evolution
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-11-03 00:00:00 , DOI: 10.1039/c7ta08090e
Bowen Ren _{1,

2,

3,

4,

5} , Dongqi Li _{1,

2,

3,

4,

5} , Qiuyan Jin _{1,

2,

3,

4,

5} , Hao Cui _{1,

2,

3,

4,

5} , Chengxin Wang _{1,

2,

3,

4,

5}

Affiliation

The design and development of non-noble metal electrocatalysts for the hydrogen evolution reaction (HER) is highly desirable, but still cannot satisfy actual requirements in terms of superior activity, ultrahigh stability and ability to carry large current densities. In this study, Ni nanoparticles anchored onto MoO₂ nanowires have been synthesized on carbon cloth via in situ exsolution under a reducing atmosphere. Impressively, the obtained Ni–MoO₂-450 NWs/CC exhibits an excellent platinum-like HER activity with a nearly zero onset overpotential and a small Tafel slope of ∼30 mV dec⁻¹, which implies that the fast recombination step is rate-limiting. Surprisingly, our sample gives an unprecedented stable catalytic activity over 320 hours in 1 M KOH, and can retain its activity at large current densities, even in the order of 1000 mA cm⁻², which is far better than other reported catalysts. Such an outstanding performance should be mainly attributed to the integrated 3D self-supported nanocatalyst, the high electronic conductivity framework and the synergistic coupling effect between Ni and MoO₂ interfaces. This work may thus provide an insight into the design and fabrication of alternative catalysts to Pt-based catalysts for the HER.

中文翻译：

集成式3D自支撑Ni装饰的MoO ₂纳米线，可作为高效电催化剂，用于超高度稳定和大电流密度的析氢

高度期望用于氢析出反应（HER）的非贵金属电催化剂的设计和开发，但是就优异的活性，超高的稳定性和承载大电流密度的能力而言，仍不能满足实际要求。在这项研究中，锚固在MoO ₂纳米线上的Ni纳米颗粒是通过在还原性气氛下原位提取在碳布上合成的。令人印象深刻的是，所获得的Ni–MoO ₂ -450 NWs / CC表现出优异的类铂HER活性，起始过电势几乎为零，Tafel斜率约为-30 mV dec ^-1，这意味着快速重组步骤是限速的。令人惊讶的是，我们的样品在1 M KOH中可在320小时内提供前所未有的稳定催化活性，并且即使在1000 mA cm ^-2的量级下也能在大电流密度下保持其活性，这远优于其他报道的催化剂。如此出色的性能应主要归因于集成的3D自支撑纳米催化剂，高电子电导率骨架以及Ni与MoO ₂界面之间的协同耦合效应。因此，这项工作可以为HER的Pt基催化剂的替代催化剂的设计和制造提供一个见识。

更新日期：2017-11-16

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11