Interlayer-expanded and defect-rich metal dichalcogenide (MX2) nanosheets for active and stable hydrogen evolution†,Inorganic Chemistry Frontiers

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Interlayer-expanded and defect-rich metal dichalcogenide (MX2) nanosheets for active and stable hydrogen evolution†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-10-25 00:00:00 , DOI: 10.1039/c8qi01064a
Jun Xu _{1,

2,

3,

4} , Yanyan Huang _{1,

2,

3,

4} , Xialan Cheng _{1,

2,

3,

4} , Tong Liu _{1,

2,

3,

4} , Yingchun Lu _{1,

2,

3,

4} , Xing Chen _{1,

2,

3,

4} , Yu You _{1,

2,

3,

4} , Junjun Zhang _{4,

5,

6,

7}

Affiliation

Layered metal dichalcogenides (MX₂) constructed from 2D covalently bonded monolayers are an exciting family as promising low-cost electrocatalysts towards the hydrogen evolution reaction (HER). Defect engineering of layered lattices to fully utilize MX₂ nanosheets is highly desirable. Herein, we report a universal synthesis of defective MX₂ nanosheets by modulating both the basal planes and the interlayers. A series of basal plane-disordered and interlayer-expanded MX₂ (M = Mo, W, Sn; X = S, Se) nanosheets are synthesized. Interlayer spacings of the MX₂ nanosheets are significantly enlarged to 0.93–1.05 nm with an increase of 0.34–0.40 nm, owing to species intercalation. Abundant defects resulting from the wide interlayer expansion and the disordered basal planes offer extensive unsaturated chalcogen atoms as active sites for HER. Consequently, interlayer-expanded and defect-rich (IEDR) MX₂ catalysts exhibit striking activities, delivering small Tafel slopes, low onset overpotentials, large cathodic current densities and excellent long-term stabilities. Our work paves a new pathway to improve the electrocatalytic HER activity by defect modulation.

中文翻译：

层间膨胀且缺陷丰富的金属二硫化碳（MX ₂）纳米片，用于活性和稳定的氢释放†

由2D共价键合的单层结构构成的层状金属二卤化金属（MX ₂）是令人振奋的一族，是有望实现氢释放反应（HER）的低成本电催化剂。非常需要分层晶格的缺陷工程以充分利用MX ₂纳米片。在这里，我们报告了有缺陷的MX ₂纳米片的普遍合成，通过调节基面和中间层。合成了一系列基础平面无序和层间扩展的MX ₂（M = Mo，W，Sn； X = S，Se）纳米片。MX _2的层间距由于物种的插入，纳米片显着扩大到0.93–1.05 nm，增加了0.34–0.40 nm。由广泛的层间膨胀和无序的基面产生的大量缺陷提供了广泛的不饱和硫属元素原子作为HER的活性位点。因此，层间膨胀的和富缺陷的（IEDR）MX ₂催化剂表现出惊人的活性，提供小的Tafel斜率，低的起始过电位，大的阴极电流密度和出色的长期稳定性。我们的工作为通过缺陷调节改善电催化HER活性开辟了一条新途径。

更新日期：2018-10-25

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