Surface and lattice engineered ruthenium superstructures towards high-performance bifunctional hydrogen catalysis

Abstract

Developing high-performance bifunctional electrocatalysts towards hydrogen evolution/oxidation reaction (HER/HOR) holds great significance for efficiently utilizing hydrogen energy. In this work, a unique class of Mo-modified Ru nanosheet assemblies (Mo-Ru NSAs)...

Strategies for Promoting Catalytic Performance of Ru‐Based Electrocatalysts towards Oxygen/Hydrogen Evolution Reaction

“…Despite the achievement for constructed Ru-based electrocatalysts, there are still some challenges and opportunities should be paid attention to the following aspects: 1) Expected bifunctional catalytic performance. RuCu nanotubes 1 M KOH 11 [30] RuNi nanosheets 1 M KOH 15 [54] RuCu nanosheets 0.5 M H 2 SO 4 19 [55] RuNi NAs 1 M KOH 39 [56] MoÀ Ru NSAs 1 M KOH 16 [57] Ru/RuS 2 0.5 M H 2 SO 4 45 [102] Ru@CQDs 1 M KOH 10 RuNi/CQDs 1 M PBS 18 [106] Ru@WNOÀ C 1 M KOH 24 [123] RuÀ MnFeP/ NF 1 M KOH 35 [124] CoRu 0.5 / CQDs 1 M KOH 18 [125] RuCuO x /NC 1 M KOH 29 [126] cRuÀ Ni 3 N 1 M KOH 32 [127] Table 2. Summary of the Ru-based electrocatalysts towards OER.…”

“…Constructing 3D superstructures can also promote the catalytic activity of Ru‐based nanomaterials by not only enlarging the electrochemical active surface but also improve the mechanical stability of the nanocatalysts. In recent years, Huang and coworkers have successively synthesized the Ru−Ni [56] (Figure 2d–f) and Ru−Mo [57] (Figure 2g–i) 3D superstructure that assembled by 2D nanosheets. It is reported that the assembly of 2D structure into unique 3D superstructures can provide an effective strategy to deliver superb electrocatalytic HER performance because the structures can achieve a large exposure of catalytic active sites while stabilizing the structure.…”

Electronic Modulation and Mechanistic Study of Ru‐Decorated Porous Cu‐Rich Cuprous Oxide for Robust Alkaline Hydrogen Oxidation and Evolution Reactions

“…The plateau current densities of Ru/Cu−Cu 2 O@C were found to increase as the rotation speed increased, which was attributed to improved mass transport at higher rotation rates [4] . This was further verified through a Koutecky‐Levich plot that yielded a value of 12.09 cm 2 mA −1 rpm 1/2 , indicating that the process was primarily controlled by H 2 mass transport [31] . The HOR activity of Ru/Cu−Cu 2 O@C and referenced samples were quantitatively assessed by kinetic current density ( j k ) that non‐linearly fitted the HOR polarization curves.…”

“…[4] This was further verified through a Koutecky-Levich plot that yielded a value of 12.09 cm 2 mA À 1 rpm 1/2 , indicating that the process was primarily controlled by H 2 mass transport. [31] The HOR activity of Ru/CuÀ Cu 2 O@C and referenced samples were quantitatively assessed by kinetic current density (j k ) that non-linearly fitted the HOR polarization curves. In Figure 4b, Ru/CuÀ Cu 2 O@C behaved as an outstanding anode material in H 2 oxidation region with the highest j k value at random fixed potentials.…”

Synergistic Regulation of Pt Clusters on Porous Support by Mo and P for Robust Bifunctional Hydrogen Electrocatalysis

“…Figure S10 displays the polarization curves of Pt/Mo,P@NC tested at various rotational speeds ranging from 400 to 2500 rpm, where the plateau current increased with increasing rotating speed due to the promoted mass transport . The corresponding Koutecky–Levich plot was calculated to be 11.87 cm 2 mA –1 rpm 1/2 , which verified the H 2 mass-transport-controlled process on Pt/Mo,P@NC . The control experiment performed in a N 2 -saturated electrolyte showed negligible anodic current throughout the entire potential range, indicating that H 2 , rather than N 2 , was the reactant for the HOR (Figure S11).…”