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Ordered mesoporous NiCo alloys for highly efficient electrocatalytic hydrogen evolution reaction
Authors:Tingting Sun  Jia Cao  Jing Dong  Hanying Du  Haijiang Zhang  Jianfeng Chen  Lianbin Xu
Affiliation:State Key Laboratory of Organic?Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
Abstract:Mesoporous Ni100?xCox alloys (0 ≤ x ≤ 100) have been fabricated by electroless deposition method using lyotropic liquid crystals (LLC) as meso-structural template and then evaluated as low-cost electrocatalysts for the hydrogen evolution reaction (HER) in alkaline medium. The mesoporous Ni/>Co catalyst of 58:42 atomic ratio (Ni<sub>58</sub>Co<sub>42</sub>) manifests the highest electrocatalytic activity toward the HER, exhibiting a low onset overpotential (η) of 52 mV and a small Tafel slope of 60 mV dec<sup>?1</sup>. In addition, this ordered mesostructured Ni<sub>58</sub>Co<sub>42</sub> catalyst shows a long-term durability under harsh hydrogen evolution cycling test and 25 h chronoamperometry measurement. The outstanding HER electrocatalytic performance of the Ni<sub>58</sub>Co<sub>42</sub> is mainly related to the synergetic combination of Ni and Co, as well as the enlarged exposure of catalytically active sites and improved transport of electrons and reacting agents arising from the unique ordered bicontinuous mesopores.</td>
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Keywords:Ordered mesoporous structure  Ni–Co alloys  Lyotropic liquid crystal  Electrocatalyst  Hydrogen evolution reaction  Durability  DMAB  dimethylamine borane  LLC  lyotropic liquid crystal  HER  hydrogen evolution reaction  LSVs  linear sweep voltammograms  CVs  cyclic voltammograms  RHE  reversible hydrogen electrode
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