@article {4162,
	title = {Electronic structure modulation of isolated Co-N4 electrocatalyst by sulfur for improved pH-universal hydrogen evolution reaction},
	journal = {Nano Energy},
	volume = {80},
	year = {2021},
	note = {<p>n/a</p>
},
	month = {2021},
	pages = {105544},
	abstract = {<p>Exploring an efficient platinum group metal (PGM) free electrocatalyst with superior activity and stability for hydrogen evolution reaction (HER) in a wide pH range is desirable for low-cost hydrogen production. Here, we report atomically dispersed cobalt on nitrogen and sulfur co-doped graphene (N-Co-S/G) for HER. Remarkably, the prepared N-Co-S/G electrocatalyst shows a small overpotential of 67.7~mV vs. reversible hydrogen electrode (RHE) at a current density of 10~mA~cm-2 and exceptional durability over 100~h at 10~mA~cm-2 under acidic conditions. Moreover, we found that the HER activity of N-Co-S/G is close to 20\% Pt/C at all pH levels (0{\textendash}14) and superior activity at high current density (\&gt;100~mA~cm-2). Experimental and theoretical calculations reveal that the S atom in N-Co-S/G form Co-S bond, resulting new Co-N3S1 active site, which optimizes Gibbs free energy for hydrogen adsorption (∆GH*) close to zero, while water adsorption and dissociation enhanced by S modulation for neutral and basic media HER.</p>
},
	keywords = {Atomic cobalt, ELECTRONIC STRUCTURE, graphene, Hydrogen evolution reaction (HER), Nitrogen and sulfur co-doped, Nonprecious electrocatalyst},
	isbn = {2211-2855},
	url = {http://www.sciencedirect.com/science/article/pii/S2211285520311186},
	author = {Sabhapathy, Palani and Indrajit Shown and Sabbah, Amr and Putikam Raghunath and Chen, Jeng-Lung and Wei-Fu Chen and Lin, Ming-Chang and Kuei-Hsien Chen and Li-Chyong Chen}
}
