cfaed Publications

@article {ADMA:ADMA201706279,
author = {Chen, Guangbo and Wang, Tao and Zhang, Jian and Liu, Pan and Sun, Hanjun and Zhuang, Xiaodong and Chen, Mingwei and Feng, Xinliang},
title = {Accelerated Hydrogen Evolution Kinetics on NiFe-Layered Double Hydroxide Electrocatalysts by Tailoring Water Dissociation Active Sites},
journal = {Advanced Materials},
issn = {1521-4095},
url = {http://dx.doi.org/10.1002/adma.201706279},
doi = {10.1002/adma.201706279},
pages = {1706279--n/a},
keywords = {electrocatalysis, hydrogen evolution reaction, NiFe-layered double hydroxide, ruthenium, water dissociation},
note = {1706279},
abstract = {Owing to its earth abundance, low kinetic overpotential, and superior stability, NiFe-layered double hydroxide (NiFe-LDH) has emerged as a promising electrocatalyst for catalyzing water splitting, especially oxygen evolution reaction (OER), in alkaline solutions. Unfortunately, as a result of extremely sluggish water dissociation kinetics (Volmer step), hydrogen evolution reaction (HER) activity of the NiFe-LDH is rather poor in alkaline environment. Here a novel strategy is demonstrated for substantially accelerating the hydrogen evolution kinetics of the NiFe-LDH by partially substituting Fe atoms with Ru. In a 1 m KOH solution, the as-synthesized Ru-doped NiFe-LDH nanosheets (NiFeRu-LDH) exhibit excellent HER performance with an overpotential of 29 mV at 10 mA cm−2, which is much lower than those of noble metal Pt/C and reported electrocatalysts. Both experimental and theoretical results reveal that the introduction of Ru atoms into NiFe-LDH can efficiently reduce energy barrier of the Volmer step, eventually accelerating its HER kinetics. Benefitting from its outstanding HER activity and remained excellent OER activity, the NiFeRu-LDH steadily drives an alkaline electrolyzer with a current density of 10 mA cm−2 at a cell voltage of 1.52 V, which is much lower than the values for Pt/C–Ir/C couple and state-of-the-art overall water-splitting electrocatalysts.},
}