@article {122,
	title = {Transition Metal Sulfide Hydrogen Evolution Catalysts for Hydrobromic Acid Electrolysis.},
	journal = {Langmuir},
	volume = {29},
	year = {2013},
	note = {CAPLUS AN 2012:1776190(Journal; Online Computer File)},
	pages = {480 - 492},
	publisher = {American Chemical Society},
	abstract = {Mixed metal sulfides contg. combinations of W, Fe, Mo, Ni, and Ru were synthesized and screened for activity and stability for the H evolution reaction (HER) in aq. HBr.  Co- and Ni-substituted RuS2 were identified as potentially active HER electrocatalysts by high-throughput screening (HTS), and the specific compns. Co0.4Ru0.6S2 and Ni0.6Ru0.4S2 were identified by optimization.  H evolution activity of Co0.4Ru0.6S2 in HBr is greater than RuS2 or CoS2 and comparable to Pt and com. RhxSy.  Structural and morphol. characterizations of the Co-substituted RuS2 suggest that the nanoparticulate solids are a homogeneous solid soln. with a pyrite crystal structure.  No phase sepn. is detected for Co substitutions <30\% by x-ray diffraction.  In 0.5 M HBr electrolyte, the Co-Ru electrode material synthesized with 30\% Co rapidly lost \~{}34\% of the initial loading of Co; thereafter, it was obsd. to exhibit stable activity for HER with no further loss of Co.  D. functional theory calcns. indicate that the S22- sites are the most important for HER and the presence of Co influences the S22- sites such that the H binding energy at sufficiently high H coverage is decreased compared to Ru sulfide.  Although showing high HER activity in a flow cell, the reverse reaction of H oxidn. is slow on the RuS2 catalysts tested when compared to Pt and Rh sulfide, leaving Rh sulfide as the only suitable tested material for a regenerative HBr cell due its stability compared to Pt. [on SciFinder(R)]},
	keywords = {transition metal sulfide hydrogen catalyst hydrobromic acid electrolysis},
	isbn = {0743-7463},
	author = {Ivanovskaya, Anna and Singh, Nirala and Liu, Ru-Fen and Kreutzer, Haley and Baltrusaitis, Jonas and Van Nguyen, Trung and Metiu, Horia and McFarland, Eric.}
}
