Qinggang He
Northeastern University
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Publication
Featured researches published by Qinggang He.
Journal of Physical Chemistry B | 2011
Qinggang He; Ahmet Kusoglu; Ivan T. Lucas; Kyle T. Clark; Adam Z. Weber; Robert Kostecki
The objective of this effort was to correlate the local surface ionic conductance of a Nafion 212 proton-exchange membrane with its bulk and interfacial transport properties as a function of water content. Both macroscopic and microscopic proton conductivities were investigated at different relative humidity levels, using direct-current voltammetry and current-sensing atomic force microscopy (CSAFM). We were able to identify small ion-conducting domains that grew with humidity at the surface of the membrane. Numerical analysis of the surface ionic conductance images recorded at various relative humidity levels helped determine the fractional area of ion-conducting active sites. A simple square-root relationship between the fractional conducting area and observed interfacial mass-transport resistance was established. Furthermore, the relationship between the bulk ionic conductivity and surface ionic conductance pattern of the Nafion membrane was examined.
Journal of the American Chemical Society | 2012
Qinggang He; Badri Shyam; Kateřina Macounová; Petr Krtil; David E. Ramaker; Sanjeev Mukerjee
This paper describes a generalized approach for the selective electrocatalytic C-C bond splitting in aliphatic alcohols at low temperature in aqueous state, with ethanol as an example. We show that selective C-C bond cleavage, leading to carbon dioxide, is possible in high pH aqueous media at low overpotentials. This improved selectivity and activity is achieved using a solution-born co-catalyst based on Pb(IV) acetate, which controls the mode of the ethanol adsorption so as to facilitate direct activation of the C-C bond. The simultaneously formed under-potentially deposited (UPD) Pb and surface lead hydroxide change the functionality of the catalyst surface for efficient promotion of CO oxidation. The resulting catalyst retains an unprecedented ability to sustain the full oxidation reaction pathway on an extended time scale of hours as opposed to minutes without addition of Pb(IV) acetate.
Journal of Power Sources | 2009
Qinggang He; Wei Chen; Sanjeev Mukerjee; Shaowei Chen; František Laufek
Journal of Physical Chemistry C | 2013
Qinggang He; Qing Li; Samson Khene; Xiaoming Ren; F.E. López-Suárez; D. Lozano-Castelló; A. Bueno-López; Gang Wu
Physical Chemistry Chemical Physics | 2010
Qinggang He; Xiaofang Yang; Wei Chen; Sanjeev Mukerjee; Bruce E. Koel; Shaowei Chen
Journal of Power Sources | 2012
Qinggang He; Xiaofang Yang; Ruihua He; A. Bueno-López; Hamish A. Miller; Xiaoming Ren; Wanli Yang; Bruce E. Koel
Electrochimica Acta | 2010
Qinggang He; Sanjeev Mukerjee
Journal of Physical Chemistry C | 2013
Qinggang He; Badri Shyam; Masahiko Nishijima; David E. Ramaker; Sanjeev Mukerjee
Journal of Power Sources | 2012
Qinggang He; Tawanda Mugadza; Xiongwu Kang; Xiaobing Zhu; Shaowei Chen; John B. Kerr; Tebello Nyokong
Journal of Physical Chemistry C | 2013
Qinggang He; Badri Shyam; Masahiko Nishijima; Xiaofang Yang; Bruce E. Koel; F. Ernst; David E. Ramaker; Sanjeev Mukerjee