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Porous core-shell N-doped Mo2[email protected] nanospheres derived from inorganic-organic hybrid precursors for highly efficient hydrogen evolution
Journal of Catalysis ( IF 7.3 ) Pub Date : 2018-02-10 , DOI: 10.1016/j.jcat.2018.01.023
Jing-Qi Chi , Wen-Kun Gao , Jia-Hui Lin , Bin Dong , Jun-Feng Qin , Zi-Zhang Liu , Bin Liu , Yong-Ming Chai , Chen-Guang Liu

Using inorganic-organic MoO42−/aniline-pyrrole (MoO42−-Polymer) hybrids nanospheres as precursors, we synthesize the porous core-shell N-doped Mo2[email protected] nanospheres with the three advantages including porous nanostructures, conductive substrate and N-doping, which may maximize the activity of electrocatalysts for hydrogen evolution reaction (HER). The as-prepared Mo2[email protected] has the porous core-shell nanospherical structure with ultrafine Mo2C nanoparticles as core and ultrathin N-doped carbon (NC) nanolayers as shell. The aniline-pyrrole in MoO42−-Polymer prevents fast growth and severe aggregation of Mo2C and form porous structure composed of ultrafine Mo2C, which implies the more exposed active sites. On the other hand, the carbonization of MoO42−-Polymer produces the ultrathin N-doped carbon shell on the surface of Mo2[email protected] nanospheres, which can optimize electronic structures and greatly improve charge transfer rate. Through varying MoO42− content and carbonization temperature, the optimized Mo2[email protected] sample exhibits enhanced HER performance and long-time stability both in acidic and alkaline solution. It requires an onset potential of only 110 mV and 60 mV, striking kinetic metrics (Tafel slope: 83 mV dec−1 and 70 mV dec−1) in 0.5 M H2SO4 and in 1 M KOH, respectively. Therefore, designing unique inorganic-organic hybrid nanostructures may open up a new way for excellent electrocatalysts for HER.



中文翻译:

无机-有机杂化前驱体衍生的多孔核壳N掺杂Mo 2 [受电子邮件保护]纳米球,可高效释放氢

使用无机有机MoO 4 2- /苯胺-吡咯(MoO 4 2-聚合物)杂化纳米球作为前驱体,我们合成了具有三个优点的多孔核壳N掺杂Mo 2 [受电子邮件保护的]纳米球,包括多孔纳米结构,导电底物和N掺杂,可以最大程度地提高电催化剂的析氢反应(HER)活性。所制备的Mo 2 [具有电子邮件保护功能]具有多孔核-壳纳米球结构,其中超细Mo 2 C纳米颗粒为核,超薄N掺杂碳(NC)纳米层为壳。MoO 4 2-聚合物中的苯胺-吡咯阻止Mo 2的快速生长和严重聚集C并形成由超细Mo 2 C组成的多孔结构,这意味着更多的活性位点暴露出来。另一方面,MoO 4 2-聚合物的碳化会在Mo 2 [受电子邮件保护的]纳米球表面产生超薄的N掺杂碳壳,可以优化电子结构并大大提高电荷转移速率。通过改变MoO 4 2-的含量和碳化温度,优化的Mo 2 [受电子邮件保护]样品在酸性和碱性溶液中均具有增强的HER性能和长期稳定性。它仅需要110 mV和60 mV的启动电位,即可达到动力学指标(塔菲尔斜率:83 mV dec -1和70 mV dec-1)分别在0.5 MH 2 SO 4和1 M KOH中。因此,设计独特的无机-有机杂化纳米结构可能为HER的优良电催化剂开辟新途径。

更新日期:2018-02-10
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