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Vertical 2D MoO2/MoSe2 Core–Shell Nanosheet Arrays as High‐Performance Electrocatalysts for Hydrogen Evolution Reaction
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2016-10-04 , DOI: 10.1002/adfm.201603674
Xiaoshuang Chen 1, 2 , Guangbo Liu 1 , Wei Zheng 1 , Wei Feng 1 , Wenwu Cao 2 , Wenping Hu 2, 3 , PingAn Hu 1
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Electrochemical water splitting is very attractive for green fuel energy production, but the development of active, stable, and earth‐abundant catalysts for the hydrogen evolution reaction (HER) remains a major challenge. Here, core–shell nanostructured architectures are used to design and fabricate efficient and stable HER catalysts from earth‐abundant components. Vertically oriented quasi‐2D core–shell MoO2/MoSe2 nanosheet arrays are grown onto insulating (SiO2/Si wafer) or conductive (carbon cloth) substrates. This core–shell nanostructure array architecture exhibits synergistic properties to create superior HER performance, where high density structural defects and disorders on the shell generated by a large crystalline mismatch of MoO2 and MoSe2 act as multiple active sites for HER, and the metallic MoO2 core facilitates charge transport for proton reduction while the vertical nanosheet arrays ensure fully exposed active sites toward electrolytes. As a HER catalyst, this electrode exhibits a low Tafel slope of 49.1 mV dec−1, a small onset potential of 63 mV, and an ultralow charge transfer resistance (Rct) of 16.6 Ω at an overpotential of 300 mV with a long cycling durability for up to 8 h. This work suggests that a quasi 2D core–shell nanostructure combined with a vertical array microstructure is a promising strategy for efficient water splitting electrocatalysts with scale‐up potential.

中文翻译:

垂直二维MoO2 / MoSe2核-壳纳米片阵列作为氢析出反应的高性能电催化剂

电化学水分解法对绿色燃料能源的生产非常有吸引力,但是开发用于氢释放反应(HER)的活性,稳定和富含地球的催化剂仍然是一项重大挑战。在这里,核-壳纳米结构用于从富含地球的组分中设计和制造高效,稳定的HER催化剂。垂直定向的准2D核-壳MoO 2 / MoSe 2纳米片阵列生长在绝缘(SiO 2 / Si晶片)或导电(碳布)基底上。这种核-壳纳米结构阵列结构具有协同特性,可创造出卓越的HER性能,其中高密度的结构缺陷和MoO 2的较大晶体错配会在壳上造成紊乱MoSe 2和MoSe 2充当HER的多个活性位,金属MoO 2核促进电荷传输以减少质子,而垂直纳米片阵列则确保活性位完全暴露于电解质。作为HER催化剂,该电极在300 mV的超电势下具有长的循环,表现出49.1 mV dec -1的低Tafel斜率,63 mV的小起始电势和16.6Ω的超低电荷转移电阻(R ct)长达8小时的耐用性。这项工作表明,准二维核-壳纳米结构与垂直阵列微结构相结合是一种具有潜力的高效水分解电催化剂的有前途的策略。
更新日期:2016-10-04
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