Efficient Hydrogen Evolution Reaction Catalysis in Alkaline Media by All-in-One MoS2 with Multifunctional Active Sites
Efficient Hydrogen Evolution Reaction Catalysis in Alkaline Media by All-in-One MoS2 with Multifunctional Active Sites
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DOI：
10.1002/adma.201707105
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发表时间：
2018-05-17
影响因子：
29.4
通讯作者：
Lee, Jae Sung
中科院分区：
文献类型：
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作者：
Anjum, Mohsin Ali Raza;Jeong, Hu Young;Lee, Jae Sung
当MoS2含有由1t相、缺陷、S空位、暴露的Mo边缘和扩大的层间间距产生的水裂解的多功能活性位点时，它成为一种高效耐用的析氢反应（HER）的非贵金属电催化剂。与之前报道的基于MoS2的催化剂只针对这些特征中的一种或几种不同，本文制备的一体化MoS2催化剂具有上述所有活性位点类型。在合成过程中，原位生成的NH3分子插入到MoS2薄片中，得到氨化的MoS2 (A-MoS2)，主要由1T-MoS2组成，并表现出扩大的层间距。随后，A-MoS2的还原导致嵌入NH3和H2S的去除，形成具有上述多功能活性位点的一体化MoS2 (R-MoS2)，其在碱性介质中的电催化HER性能优于所有先前报道的基于MoS2的电催化剂。特别是，MoS2/镍泡沫混合催化剂在实际有意义的大电流区域（>25 mA cm(-2)）中优于商用Pt/C催化剂，这表明r -MoS2基材料有可能在实际的碱性HER系统中取代Pt催化剂。
MoS2 becomes an efficient and durable nonprecious-metal electrocatalyst for the hydrogen evolution reaction (HER) when it contains multifunctional active sites for water splitting derived from 1T-phase, defects, S vacancies, exposed Mo edges with expanded interlayer spacings. In contrast to previously reported MoS2-based catalysts targeting only a single or few of these characteristics, the all-in-one MoS2 catalyst prepared herein features all of the above active site types. During synthesis, the intercalation of in situ generated NH3 molecules into MoS2 sheets affords ammoniated MoS2 (A-MoS2) that predominantly comprises 1T-MoS2 and exhibits an expanded interlayer spacing. The subsequent reduction of A-MoS2 results in the removal of intercalated NH3 and H2S to form an all-in-one MoS2 with multifunctional active sites mentioned above (R-MoS2) that exhibits electrocatalytic HER performance in alkaline media superior to those of all previously reported MoS2-based electrocatalysts. In particular, a hybrid MoS2/nickel foam catalyst outperforms commercial Pt/C in the practically meaningful high-current region (>25 mA cm(-2)), demonstrating that R-MoS2-based materials can potentially replace Pt catalysts in practical alkaline HER systems.