Si Jincheng, Zheng Qiang, Chen Hanlin, Lei Chaojun, Suo Yange, Yang Bin, Zhang Zhiguo, Li Zhongjian, Lei Lecheng, Hou Yang, Ostrikov Kostya Ken
Department of Energy and Environmental Systems Engineering , Zhejiang University of Science and Technology , Liuhe Road 318# , Hangzhou , Zhejiang Province 310023 , China.
Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering , Zhejiang University , Hangzhou 310027 , China.
ACS Appl Mater Interfaces. 2019 Apr 10;11(14):13205-13213. doi: 10.1021/acsami.8b22052. Epub 2019 Mar 27.
Two-dimensional (2D) niobium disulfide (NbS) materials feature unique physical and chemical properties leading to highly promising energy conversion applications. Herein, we developed a robust synthesis technique consisting of electrochemical exfoliation under alternating currents and subsequent liquid-phase exfoliation to prepare highly uniform few-layer NbS nanosheets. The obtained few-layer NbS material has a 2D nanosheet structure with an ultrathin thickness of ∼3 nm and a lateral size of ∼2 μm. Benefiting from their unique 2D structure and highly exposed active sites, the few-layer NbS nanosheets drop-casted on carbon paper exhibited excellent catalytic activity for the hydrogen evolution reaction (HER) in acid with an overpotential of 90 mV at a current density of 10 mA cm and a low Tafel slope of 83 mV dec, which are superior to those reported for other NbS-based HER electrocatalysts. Furthermore, few-layer NbS nanosheets are effective as bifunctional electrocatalysts for hydrogen production by overall water splitting, where the urea and hydrazine oxidation reactions replace the oxygen evolution reaction.
二维（2D）二硫化铌（NbS）材料具有独特的物理和化学性质，在能量转换应用方面前景广阔。在此，我们开发了一种稳健的合成技术，该技术包括交流电下的电化学剥离以及随后的液相剥离，以制备高度均匀的少层NbS纳米片。所获得的少层NbS材料具有二维纳米片结构，其超薄厚度约为3 nm，横向尺寸约为2μm。得益于其独特的二维结构和高度暴露的活性位点，滴铸在碳纸上的少层NbS纳米片在酸性条件下对析氢反应（HER）表现出优异的催化活性，在电流密度为10 mA cm时过电位为90 mV，塔菲尔斜率低至83 mV dec，优于其他基于NbS的HER电催化剂的报道值。此外，少层NbS纳米片作为通过全水分解制氢的双功能电催化剂效果显著，其中尿素和肼氧化反应取代了析氧反应。
