Hexagonal RuSe₂ Nanosheets for Highly Efficient Hydrogen Evolution Electrocatalysis

Abstract

Layered transition metal dichalcogenide (TMD) nanomaterials are promising alternatives to platinum (Pt) for the hydrogen evolution reaction (HER). However, the family of layered TMDs is mainly limited to Group IV-VII transition metals, while the synthesis of layered TMDs based on metals from other groups still remains a challenge. Herein, we demonstrate by atomic-resolution transmission electron microscopy that hexagonal RuSe 2 (h-RuSe 2) nanosheets with a mixture of 2H and 1T phases can be obtained by a facile bottom-up colloidal synthetic approach. The obtained h-RuSe 2 , which can be transformed into the thermodynamically favorable phase of cubic RuSe 2 (c-RuSe 2) only after annealing at 600 8C, exhibits Pt-like HER performance, with a fivefold turnover frequency enhancement compared to the c-RuSe 2 in alkaline media. Experimental results and density functional theory (DFT) calculations reveal that the enhanced adsorption free energies of H 2 O (DG H 2 O *), optimized adsorption free energies of H (DG H*), and increased conductivity of h-RuSe 2 contribute to its superior HER activity.

Ultra-small Ru nanoparticles embedded on Fe–Ni(OH)2 nanosheets for efficient water splitting at a large current density with long-term stability of 680 hours

“…3e shows that the C dl value for RuFe@NF (32.65 mF cm −2 ) is significantly larger than that of the Ru@NF (28.98 mF cm −2 ), even ∼16-fold higher than that of Fe@NF (2.13 mF cm −2 ), indicating that RuFe@NF possesses abundant active sites. 49 The RuFe@NF also achieves a high turnover frequency (TOF) of 1.23 s −1 at an overpotential of 50 mV by assuming Ru as the HER active sites, demonstrating its excellent intrinsic activity. Moreover, the RuFe@NF displays long-term durability of 190 hours at 10 mA cm −2 (Fig.…”

RuP Nanoparticles Supported on N, O Codoped Porous Hollow Carbon for Efficient Hydrogen Oxidation Reaction

“…[ 14 ] The phosphorus atom has strong electronegativity, making it easy to accept electrons from the Ru atom and further adjusting the electronic structure of Ru, which may overcome the strong oxophilicity of Ru. Additionally, compared with other Ru‐based compounds, such as RuO 2 , [ 15 ] RuS 2 , [ 16 ] and RuSe 2 , [ 17 ] RuP has better HER performance, indicating it possesses more favorable hydrogen adsorption strength. [ 18 ] The above advantages make RuP a potential candidate for achieving high alkaline HOR performance.…”

“…[14] The phosphorus atom has strong electronegativity, making it easy to accept electrons from the Ru atom and further adjusting the electronic structure of Ru, which may overcome the strong oxophilicity of Ru. Additionally, compared with other Ru-based compounds, such as RuO 2 , [15] RuS 2 , [16] and RuSe 2 , [17] RuP has better HER…”

Sequential self-reconstruction of localized Mo species in hierarchical carbon/Co–Mo oxide heterostructures for boosting alkaline hydrogen evolution kinetics and durability

“…2e and S16†). 23 It is suggested that the number of catalytically active sites is increased on the sample after the in situ AO reaction for MoO 4 2− dissolution. 24…”