Metallic WO2-Carbon Mesoporous Nanowires as Highly Efficient Electrocatalysts for Hydrogen Evolution Reaction
Metallic WO2-Carbon Mesoporous Nanowires as Highly Efficient Electrocatalysts for Hydrogen Evolution Reaction
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DOI：
10.1021/jacs.5b01330
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发表时间：
2015-06-10
影响因子：
15
通讯作者：
Zhang, Bin
中科院分区：
文献类型：
--
作者：
Wu, Rui;Zhang, Jingfang;Zhang, Bin
开发具有良好活性和稳定性的电催化剂制氢是化学和能源领域的一大挑战。在这里，我们展示了一个“一石三鸟”的方法来合成低毒性的金属WO 2-碳介孔纳米线与高浓度的氧空位（OV）通过煅烧的无机/有机WO 3-乙二胺混合前体。该产品具有优异的Fly生成性能：起始过电位仅为35 mV，10和20 mA/cm（2）所需的过电位为58和78 mV，Tafel斜率为46 mV/decade，交换电流密度为0.64 mA/cm（2），稳定性超过10 h。结合密度泛函理论的进一步研究表明，高浓度的OV产生的不寻常的电子结构和大量的活性中心以及紧密附着的碳材料是优异性能的关键因素。我们的研究结果从实验和理论上建立了过渡金属。氧化物（TMOs）作为一种新颖的电催化剂用于H-2的生成。这种具有OV的TMO可能是其他能量存储和转换应用的有希望的候选者。
The development of electrocatalysts to generate hydrogen, with good activity and stability, is a great Challenge in the fields of chemistry and energy. Here we demonstrate a "hitting three birds with one stone" method to synthesize less toxic metallic WO2-carbon mesoporous nanowires with high concentration of oxygen vacancies (OVs) via calcination of inorganic/organic WO3-ethylenediamine hybrid precursors. The products exhibit excellent performance for Fly generation: the onset overpotential is only 35 mV, the required overpotentials for 10 and 20 mA/cm(2) are 58 and 78 mV, the Tafel Slope is 46 mV/decade, the exchange current density is 0.64 mA/cm(2), and the Stability is over 10 h. Further studies, in combination with density functional theory, demonstrate that the unusual electronic structure and the large amount of active sites, generated by the high concentration of OVs, As well as the Closely attached carbon materials, were key factors for excellent performance. Our results experimentally and theoretically establish metallic transition metal. oxides (TMOs) as intriguing novel eleetrocatalysts for H-2 generation. Such TMOs with OVs might be promising candidates for other energy storage and conversion applications.