Although great progress in pursuing high-performance catalysts for advanced electrocatalysis has been made, the design of high-efficiency electrocatalysts continues to be a huge challenge for commercializing electrochemical energy technologies. Herein, a three-dimensional (3D) hierarchical assembly nanostructure consisting of ultrathin Ir-doped Pd nanosheets has been well designed, which could serve as a bifunctional electrocatalyst for advanced hydrogen evolution reaction (HER) and liquid fuel electrooxidation. In particular, the optimized Pd 83.5 Ir 16.5 nanocatalyst displays excellent electrocatalytic HER performance with an overpotential of only 73 mV at 10 mA cm −2 along with excellent stability. More importantly, it can also show outstanding electrocatalytic performance for liquid fuel oxidation with a mass activity of 4326.1 mA mg metal −1 for ethylene glycol oxidation reaction. Mechanistic study reveals that the highly porous 3D nanostructure, the modulation of electronic structure after the introduction of Ir, not only guarantees a high level of exposure of surface active sites and smooth charge transfer but also generates the new active centers for facilitating the adsorption of H 2 O and recombination of H*, thereby dramatically increasing the intrinsic activity of electrocatalysis.

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Rational design and fabrication of highly active electrocatalysts toward hydrogen evolution reaction (HER) is of paramount significance in the industrial hydrogen production via water electrolysis. Herein, by taking advantages of...

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Optimizing the electronic and synergistic effect of hybrid electrocatalysts based on Pt and Pt-based nanocatalysts is of tremendous importance towards a superior hydrogen evolution performance under both acidic and alkaline conditions. However, developing an ideal Pt-based hydrogen evolution reaction (HER) electrocatalyst with moderated electronic structure as well as strong synergistic effect is still a challenge. Herein, we fabricated boron (B)-doped PtNi nanobundles by a two-step method using NaBH 4 as the boron source to obtain PtNi/Ni 4 B 3 heterostructures with well-defined nanointerfaces between PtNi and Ni 4 B 3 , achieving an enhanced catalytic HER performance. Especially, the PtNi/Ni 4 B 3 nanobundles (PtNi/Ni 4 B 3 NBs) can deliver a current density of 10 mA cm À 2 at the overpotential of 14.6 and 26.5 mV under alkaline and acidic media, respectively, as well as outstanding electrochemical stability over 40 h at the current density of 10 mA cm À 2 . Remarkably, this approach is also universal for the syntheses of PtCo/Co 3 B and PtFe/Fe 49 B with outstanding electrocatalytic HER performance.