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In Situ Growth of Ru Nanoparticles on (Fe,Ni)(OH)2 to Boost Hydrogen Evolution Activity at High Current Density in Alkaline Media
Small Methods ( IF 12.4 ) Pub Date : 2020-01-27 , DOI: 10.1002/smtd.201900796
Xin Xiao 1, 2 , Xikui Wang 1 , Xingxing Jiang 1 , Shaowei Song 2 , Dekang Huang 3 , Luo Yu 2 , Yang Zhang 1 , Shuo Chen 2 , Mingkui Wang 1 , Yan Shen 1 , Zhifeng Ren 2
Affiliation  

Electrocatalytic water splitting for industrial hydrogen production at large current densities requests highly active and cost‐effective catalysts with long‐term stability. Here, conductive nickel foam is proposed to be used as a substrate to support (Fe,Ni)(OH)2 nanosheet arrays and a reducing agent to reduce Ru3+ ions to metallic Ru. The formed 3D self‐supported Ru/(Fe,Ni)(OH)2/NF (denoted as RFNOH) with a superhydrophilic surface and high conductivity ensures rapid release of gases and efficient electron transportation and mass transfer at a high current density. The resultant RFNOH requires an overpotential of only 152 mV to achieve a current density of 1 A cm−2 for hydrogen evolution reaction in 1 m KOH solution, along with excellent stability at high current density. Meanwhile, density functional theory calculations suggest that (Fe,Ni)(OH)2 promotes the dissociation of water molecules considerably, which plays a critical role in enhancing the generation of molecular hydrogen on Ru nanoparticles. Furthermore, the proposed dual‐active site mechanism solves the problem of low water‐dissociation efficiency faced by noble metal‐based catalysts under alkaline media. This study provides a new route for the practical production of large quantities of hydrogen via electrochemical water splitting.

中文翻译:

在碱性介质中高电流密度下在(Fe,Ni)(OH)2上原位生长Ru纳米粒子以增强氢释放活性

用于大电流密度工业氢生产的电催化水分解需要具有长期稳定性的高活性和高性价比催化剂。在此,提出了将导电泡沫镍用作支撑(Fe,Ni)(OH)2纳米片阵列的基材和将Ru 3+离子还原成金属Ru的还原剂。形成的具有超亲水表面和高电导率的3D自支撑Ru /(Fe,Ni)(OH)2 / NF(表示为RFNOH)可确保气体的快速释放以及高电流密度下的有效电子传输和质量传递。所得的RFNOH仅需152 mV的超电势即可在1 m内实现氢气析出反应的1 A cm -2电流密度KOH溶液,以及在高电流密度下的出色稳定性。同时,密度泛函理论计算表明(Fe,Ni)(OH)2极大地促进了水分子的离解,这在增强Ru纳米颗粒上分子氢的生成方面起着关键作用。此外,提出的双活性位点机制解决了碱性介质下贵金属催化剂面临的水分解效率低的问题。该研究为通过电化学水分解生产大量氢气提供了一条新途径。
更新日期:2020-01-27
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