@article{li_zhang_yu_huang_yang_cao_2017, title={Activating MoS2 for pH-Universal Hydrogen Evolution Catalysis}, volume={139}, ISSN={["1520-5126"]}, DOI={10.1021/jacs.7b07450}, abstractNote={MoS2 presents a promising catalyst for the hydrogen evolution reaction (HER) in water splitting, but its worse catalytic performance in neutral and alkaline media than in acidic environment may be problematic for practical application. This is because the other half reaction of water splitting, i.e., oxygen evolution reaction, often needs to be implemented in alkaline environment. Here we demonstrate a universal strategy that may be used to significantly improve the HER catalysis of MoS2 in all kinds of environments from acidic to alkaline, proton intercalation. Protons may be enabled to intercalate between monolayer MoS2 and underlying substrates or in the interlayer space of thicker MoS2 by two processes: electrochemically polarizing MoS2 at negative potentials (vs RHE) in acidic media or immersing MoS2 into certain acid solutions like TFSI. The improvement in catalytic performance is due to the activity enhancement of the active sites in MoS2 by the intercalated protons, which might be related with the effect of the intercalated protons on electrical conductance and the adsorption energy of hydrogen atoms. The enhancement in catalytic activity by the intercalated proton is very stable even in neutral and alkaline electrolytes.}, number={45}, journal={JOURNAL OF THE AMERICAN CHEMICAL SOCIETY}, author={Li, Guoqing and Zhang, Du and Yu, Yifei and Huang, Shengyang and Yang, Weitao and Cao, Linyou}, year={2017}, month={Nov}, pages={16194–16200} }
 @article{huang_sodano_leonard_luiso_fedkiw_2017, title={Cobalt-Doped Iron Sulfide as an Electrocatalyst for Hydrogen Evolution}, volume={164}, ISSN={["1945-7111"]}, DOI={10.1149/2.0761704jes}, abstractNote={Iron disulfide (FeS2) promises an earth-abundant, low-cost alternative to platinum group metals for the hydrogen evolution reaction (HER), but its performance is currently limited by reactivity of active sites and poor electrical conductivity. Here we employ Ketjenblack (KB) as a support to create an Fe-based electrocatalyst with high-electrical conductivity and maximal active sites. Moreover, a systematic study on the role of cobalt (Co) dopant was carried out. Electrochemical results show enhancements in HER activity of Co-doped FeS2 [FexCo1−xS2, atomic content of Fe (x) = 0.98 – 0.32] in comparison to un-doped FeS2 in acidic electrolyte (pH = 0). The overpotential necessary to drive a current density of 10 mA/cm2 is −0.150 V and only decreases by 1 mV after 500 cycles of a durability test (cycling the potential between 0.0 and −0.15 V), indicating a long-term durability in acidic environment. This work suggests that FexCo1−xS2 offers a viable approach to improve the activity and durability of transition metal-sulfide electrocatalysts. © The Author(s) 2017. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.0761704jes] All rights reserved.}, number={4}, journal={JOURNAL OF THE ELECTROCHEMICAL SOCIETY}, author={Huang, Sheng-Yang and Sodano, Daniel and Leonard, Thomas and Luiso, Salvatore and Fedkiw, Peter S.}, year={2017}, pages={F276–F282} }
 @article{huang_li_zhu_fedkiw_2017, title={Investigation and modification of carbon buckypaper as an electrocatalyst support for oxygen reduction}, volume={47}, ISSN={["1572-8838"]}, DOI={10.1007/s10800-016-1023-4}, number={1}, journal={JOURNAL OF APPLIED ELECTROCHEMISTRY}, author={Huang, Sheng-Yang and Li, Qingwen and Zhu, Yuntian and Fedkiw, Peter S.}, year={2017}, month={Jan}, pages={105–115} }
 @article{huang_fedkiw_2016, title={Pervaporation removal of water from ionic liquid solutions using Nafion membranes}, volume={51}, ISSN={["1520-5754"]}, DOI={10.1080/01496395.2016.1236816}, abstractNote={ABSTRACT We report a pervaporation process to remove water from a solution containing ionic liquid (IL) + solvent + water. Specifically, Nafion-based membranes were employed for the separation, and tributylmethylammonium dimethylphosphate and N-methyl-2-pyrrolidone (NMP) were the IL and solvent, respectively. Membrane swelling in contact with the IL–NMP–H2O solution was accommodated by judicious use of gaskets and membrane supports. The pervaporation fluxes of water and NMP increased with temperature and flow rate of the permeate sweep gas. Among the membranes examined, a commercially available Nafion membrane (XL, Ion Power) provided the highest water (10 mg h−1 cm−2) and NMP (182 mg h−1 cm−2) fluxes. The results show that pervaporation separation is a technologically feasible method to decrease the water content of an IL–NMP–H2O solution from 1 to 0.5 wt%.}, number={18}, journal={SEPARATION SCIENCE AND TECHNOLOGY}, author={Huang, Sheng-Yang and Fedkiw, Peter S.}, year={2016}, pages={2932–2939} }
 @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{dufficy_huang_khan_fedkiw, title={Effects of composition and structure on the performance of tin/graphene-containing carbon nanofibers for Li-ion anodes}, volume={7}, number={25}, journal={RSC Advances}, author={Dufficy, M. K. and Huang, S. Y. and Khan, S. A. and Fedkiw, P. S.}, pages={15428–15438} }