@article{li_yu_huang_nielsen_goddard_li_cao_2015, title={Engineering the Composition and Crystallinity of Molybdenum Sulfide for High-Performance Electrocatalytic Hydrogen Evolution}, volume={5}, ISSN={["2155-5435"]}, DOI={10.1021/cs501635v}, abstractNote={The key challenge for the development of high-performance molybdenum sulfide HER catalysts lies in the limited fundamental understanding for the correlation between the catalytic activities and physical features of the materials. Here we have demonstrated an unambiguous correlation between the catalytic performance and the composition/crystallinity of molybdenum sulfide. The results indicate that the crystallinity plays an overwhelming role in determining the catalytic performance, while the composition does not matter much. The crystallinity can affect the three figures of merit of the catalytic performance (Tafel slope, turnover frequency (TOF), and stability) in opposite directions. Generally, the materials with low crystalline quality may provide low Tafel slopes (∼40 mV/dec), while highly crystalline molybdenum sulfide shows higher TOFs (by 2 orders of magnitude) and better stability. DFT calculations suggest that the terminal disulfur complex S22–, which may exist in MoS3 and also likely MoS2 of low...}, number={1}, journal={ACS CATALYSIS}, author={Li, Yanpeng and Yu, Yifei and Huang, Yufeng and Nielsen, Robert A. and Goddard, William A., III and Li, Yao and Cao, Linyou}, year={2015}, month={Jan}, pages={448–455} }
 @article{yu_huang_li_steinmann_yang_cao_2014, title={Layer-Dependent Electrocatalysis of MoS2 for Hydrogen Evolution}, volume={14}, ISSN={["1530-6992"]}, DOI={10.1021/nl403620g}, abstractNote={The quantitative correlation of the catalytic activity with the microscopic structure of heterogeneous catalysts is a major challenge for the field of catalysis science. It requests synergistic capabilities to tailor the structure with atomic scale precision and to control the catalytic reaction to proceed through well-defined pathways. Here we leverage on the controlled growth of MoS2 atomically thin films to demonstrate that the catalytic activity of MoS2 for the hydrogen evolution reaction decreases by a factor of ∼ 4.47 for the addition of every one more layer. Similar layer dependence is also found in edge-riched MoS2 pyramid platelets. This layer-dependent electrocatalysis can be correlated to the hopping of electrons in the vertical direction of MoS2 layers over an interlayer potential barrier. Our experimental results suggest the potential barrier to be 0.119 V, consistent with theoretical calculations. Different from the conventional wisdom, which states that the number of edge sites is important, our results suggest that increasing the hopping efficiency of electrons in the vertical direction is a key for the development of high-efficiency two-dimensional material catalysts.}, number={2}, journal={NANO LETTERS}, author={Yu, Yifei and Huang, Sheng-Yang and Li, Yanpeng and Steinmann, Stephan N. and Yang, Weitao and Cao, Linyou}, year={2014}, month={Feb}, pages={553–558} }
 @article{fu_li_dirican_chen_lu_zhu_li_cao_bradford_zhang_et al._2014, title={Sulfur gradient-distributed CNF composite: a self-inhibiting cathode for binder-free lithium-sulfur batteries}, volume={50}, ISSN={["1364-548X"]}, url={https://publons.com/publon/26924687/}, DOI={10.1039/c4cc04970e}, abstractNote={A self-inhibiting, gradient sulfur structure was designed and developed by the synthesis of a carbon nanofiber-sulphur composite via sulfur vapor deposition method for use as a binder-free sulfur cathode, exhibiting high sulfur loading (2.6 mg cm(-2)) and high sulfur content (65%) with a stable capacity of >700 mA h g(-1).}, number={71}, journal={CHEMICAL COMMUNICATIONS}, publisher={Royal Society of Chemistry (RSC)}, author={Fu, Kun and Li, Yanpeng and Dirican, Mahmut and Chen, Chen and Lu, Yao and Zhu, Jiadeng and Li, Yao and Cao, Linyou and Bradford, Philip D. and Zhang, Xiangwu and et al.}, year={2014}, pages={10277–10280} }