Institute of Advanced Materials (IAM), School of Materials Science and Engineering and Key Laboratory for Organic Electronics & Information Displays (KLOEID), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing, 210023, China.
Nanoscale. 2014 Jun 7;6(11):5762-9. doi: 10.1039/c3nr06084e. Epub 2014 Mar 21.
A general and facile method for water-dispersed noble metal (Au, Ag, Pd, Pt) nanocrystal modified MoS2 nanosheets (NM-MoS2 NSs) has been developed. By using sodium carboxymethyl cellulose as a stabilizer, well-dispersed NM-MoS2 NSs with homogeneously deposited noble metal nanocrystals (NM NCs) can be synthesized in aqueous solutions. Due to the transition from the semiconducting 2H phase to the metallic 1T phase, the chemically exfoliated MoS2 (ce-MoS2) NSs have improved electrochemical activity. The partially metallic nature of the ce-MoS2 NSs and the catalytic activity of the NM NCs synergistically make NM-MoS2 NSs a potential electrochemical catalyst. For the first time, Pd-MoS2 NSs were used as an electrocatalyst for methanol oxidation in alkaline media. The results showed that Pd-MoS2 NSs have enhanced catalytic activity with 2.8-fold anodic peak current mass density compared to a commercial Pd/C catalyst, suggesting potential for application in direct methanol fuel cells (DMFCs).
一种通用且简便的方法可制备出在水中稳定分散的负载贵金属（Au、Ag、Pd、Pt）纳米晶的 MoS2 纳米片（NM-MoS2 NSs）。以羧甲基纤维素钠为稳定剂，可在水溶液中合成均匀负载贵金属纳米晶（NM NCs）的 NM-MoS2 NSs。由于从半导体 2H 相转变为金属 1T 相，化学剥离的 MoS2（ce-MoS2）NSs 的电化学活性得到提高。ce-MoS2 NSs 的部分金属性质和 NM NCs 的催化活性协同作用使 NM-MoS2 NSs 成为一种有潜力的电化学催化剂。首次将 Pd-MoS2 NSs 用作碱性介质中甲醇氧化的电催化剂。结果表明，Pd-MoS2 NSs 的阳极峰电流质量密度比商业 Pd/C 催化剂提高了 2.8 倍，表明其在直接甲醇燃料电池（DMFCs）中有应用潜力。
