Different phases of few-layer MoS2 and their silver/gold nanocomposites for efficient hydrogen evolution reaction,Catalysis Science & Technology

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Different phases of few-layer MoS2 and their silver/gold nanocomposites for efficient hydrogen evolution reaction
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2019-11-19 , DOI: 10.1039/c9cy02158b
Jing Wang _{1,

2,

3,

4} , Wenhui Fang _{1,

2,

3,

4} , Ye Hu _{1,

2,

3,

4} , Yuhua Zhang _{1,

2,

3,

4} , Jiaqi Dang _{1,

2,

3,

4} , Ying Wu _{1,

2,

3,

4} , Hong Zhao _{1,

2,

3,

4} , Zengxi Li _{1,

2,

3,

4}

Affiliation

Molybdenum disulfide (MoS₂) is expansively studied as the most promising non-precious metal catalyst for the hydrogen evolution reaction (HER) because of its excellent properties. However, the properties of MoS₂ are quite distinct when the contents of the trigonal (1T) phase and hexagonal (2H) phase constituting MoS₂ are different. Herein, three MoS₂ representatives with different contents of the 1T phase are synthesized by a simple method, denoted as 1T-MoS₂, 1T/2H-MoS₂ and 2H-MoS₂ from high to low contents of the 1T phase. The chemical composition and crystalline phase of the three samples are systematically analyzed and characterized. To improve charge transport between adjacent nanosheets of MoS₂, silver and gold nanoparticles (Ag/AuNPs) are decorated on MoS₂, denoted as 1T-MoS₂@Ag/AuNPs, 1T/2H-MoS₂@Ag/AuNPs and 2H-MoS₂@Ag/AuNPs. The HER catalytic experiments of various MoS₂ samples in 0.5 M H₂SO₄ show that 1T-MoS₂ has the best catalytic performance compared to 1T/2H-MoS₂ and 2H-MoS₂. Owing to the cooperative effect of the 1T phase and Ag/AuNPs, the 1T-MoS₂@Ag/AuNP nanocomposite exhibits better HER electrocatalytic activity than the other MoS₂ samples because it contains a higher-percentage 1T phase and a higher charge transfer rate. This study offers an abundant foundation for designing and improvement of electrocatalysts based on MoS₂ and its nanocomposites.

中文翻译：

几层MoS2及其银/金纳米复合材料的不同相可有效地产生氢气

二硫化钼（MoS ₂）由于其优异的性能而被广泛地研究为氢释放反应（HER）中最有希望的非贵金属催化剂。然而，硫化钼的属性₂是截然不同当三角（1T）相和构成的MoS六边形（2H）相的内容物₂是不同的。这里，3个MOS _2名代表与1T相位的不同内容由一个简单的方法，表示为1T-MOS合成₂，1T / 2H-MOS ₂和2H-MOS ₂从1T相的高含量到低含量。系统地分析和表征了这三个样品的化学成分和结晶相。为了改善的MoS的相邻纳米片之间的电荷传输₂，银和金的纳米颗粒银（Ag /金纳米粒子）的上装饰的MoS ₂，表示为1T-MOS ₂ @的Ag /纳米金，1T / 2H-MOS ₂ @的Ag /金纳米粒子和2H- MoS ₂ @ Ag / AuNPs。在0.5 MH ₂ SO _4中对各种MoS ₂样品进行的HER催化实验表明，与1T / 2H-MoS ₂和2H-MoS ₂相比，1T-MoS ₂具有最佳的催化性能。。由于1T相和Ag / AuNPs的协同作用，1T-MoS ₂ @ Ag / AuNP纳米复合材料比其他MoS ₂样品具有更好的HER电催化活性，因为它包含更高百分比的1T相和更高的电荷转移速率。这项研究为基于MoS ₂及其纳米复合材料的电催化剂的设计和改进提供了丰富的基础。

更新日期：2019-11-19

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