Cracked monolayer 1T MoS2 with abundant active sites for enhanced electrocatalytic hydrogen evolution
Cracked monolayer 1T MoS2 with abundant active sites for enhanced electrocatalytic hydrogen evolution
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具有丰富活性位点的破裂单层 1T MoS2，可增强电催化析氢
DOI：
10.1039/c6cy02649d
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发表时间：
2017-02-07
影响因子：
5
通讯作者：
Liu, Yutang
中科院分区：
文献类型：
--
作者：
Li, Yue;Wang, Longlu;Liu, Yutang
二硫化钼(MoS_2)是一种很有前途的非贵金属催化剂，但其活性中心密度大、电输运能力差等限制了其性能。在这里，我们报道了通过超声增强锂插层水热合成的MoS2纳米片的设计和制备具有多孔结构的裂解单层1T MoS2。这种独特的催化剂可以通过在单层纳米片中形成孔洞来引入更多的活性中心，并且通过改变电子状态从2H相的半导体态到1T相的金属态来提高电传输能力。正如预期的那样，裂解的单层1TMoS2具有良好的耐久性和优异的析氢反应性能，在酸性介质中的过电位(10 mA cm−2时)为156 mV(Vvs RHE)，小的塔菲尔斜率为42.7mV−1。这将为设计基于MoS2或其他层状材料的电催化剂提供一种有趣而有效的方法，以提高其性能。
Molybdenum disulfide (MoS2) is a promising non-precious-metal catalyst, but its performance is limited by its density of active sites and poor electrical transport. Here, we report the design and preparation of cracked monolayer 1T MoS2 with a porous structure through the ultrasonication enhanced lithium intercalation of hydrothermally synthesized MoS2 nanosheets. The unique resulting catalyst can have more active sites introduced via the formation of porosity within the monolayer nanosheet, and the electrical transport ability can be increased through the change in electronic states from semiconducting in the 2H phase to metallic in the 1T phase. As is expected, the cracked monolayer 1T MoS2 exhibited good durability and an excellent hydrogen evolution reaction performance with a low overpotential (at 10 mA cm−2) of 156 mV (V vs. RHE) in acid media and a small Tafel slope of 42.7 mV dec−1. This work will provide an intriguing and effective approach to designing electrocatalysts based on MoS2 or other layered materials with enhanced HER performance.