Duetting electronic structure modulation of Ru atoms in RuSe₂@NC enables more moderate H* adsorption and water dissociation for hydrogen evolution reaction

Abstract

Electronic structure modulation of catalytic active atoms in the catalyst design is an attractive route for realizing active and stable hydrogen evolution reaction (HER). The role of duet or even...

Work‐function‐induced Interfacial Built‐in Electric Fields in Os‐OsSe2Heterostructures for Active Acidic and Alkaline Hydrogen Evolution

“…The full‐scan X‐ray photoelectron spectroscopy (XPS) survey patterns of pure Os, OsSe 2 and heterostructural Os‐OsSe 2 verify their expected surface elemental composition of Os, Se and trace O (Figure S6). As depicted in Figure 2f, two peaks assigned to Se 3d 3/2 (56.1 eV) and Se 3d 5/2 (55.2 eV) of Os‐OsSe 2 shift about 0.2 eV to higher binding energy relative to the pure OsSe 2 , [10, 15] while for Os 0 signals in the Os 4f 5/2 (53.5 eV) and Os 4f 7/2 (50.8 eV) core levels of Os‐OsSe 2 , they shift about 0.3 eV to lower binding energy relative to elemental Os [8, 16] . Combined with Se 3p spectra (Figure S7), the formation of the Os‐Se bond in OsSe 2 and Os‐OsSe 2 is further confirmed [17] .…”

“…[8] Therefore, a corresponding electron-deficient weak adsorber is required for its pairing. Considering that selenium (Se: 2.4) is more electronegative than Os (2.2), it may lead to electron deficiency in Os, and PtSe 2 [9] and RuSe 2 [10] have been proved to have weak adsorption systems in previous work, we first analyze the suitability of combining OsSe 2 and Os by density functional theory (DFT) calculations. Excitingly, the Os-OsSe 2 hetero-structure with a neutralized WF value achieves a perfect pairing of strong and weak adsorbers.…”

Simultaneous optimization of CoIr alloy nanoparticles and 2D graphitic-N doped carbon support in CoIr@CN by Ir doping for enhanced oxygen and hydrogen evolution reactions

“…19,23 Usually, nitrogendoped carbon materials with high surface area, excellent conductivity and easy accessibility can work as a representative support to stabilize metal nanoparticles. 20,24,25 More than that, the N dopants, especially the graphitic-N and pyridine-N in the carbon lattice also regulate the electronic distribution of the carbon-based network due to higher electronegativity of N atoms, which can improve its performance and stability by enhancing p bonds. [26][27][28][29] Based on the active N-doped carbon support, strong metal-support interaction and intrinsic activity of the support can protect metal nanoparticles from acid/ alkaline corrosion and agglomeration during the catalytic process, which can improve the utilization efficiency and catalytic performance of catalysts.…”

“…[26][27][28][29] Based on the active N-doped carbon support, strong metal-support interaction and intrinsic activity of the support can protect metal nanoparticles from acid/ alkaline corrosion and agglomeration during the catalytic process, which can improve the utilization efficiency and catalytic performance of catalysts. 25 Meanwhile, the metal-N bonds between nitrogen-doped carbon support and metal nanoparticles can also optimize the electronic structure of the metal particles and then accelerate electron transfer between the support and metal particles. 15,19 Based on all the above, the duetting or multiple electronic structure modulation of metal nanoparticles from the alloying strategy and N-doped carbon support imply a potential tactic to effectively improve the electrocatalytic performance of supported catalysts.…”

Work‐function‐induced Interfacial Built‐in Electric Fields in Os‐OsSe2Heterostructures for Active Acidic and Alkaline Hydrogen Evolution

“…[8] Therefore, a corresponding electron-deficient weak adsorber is required for its pairing. Considering that selenium (Se: 2.4) is more electronegative than Os (2.2), it may lead to electron deficiency in Os, and PtSe 2 [9] and RuSe 2 [10] have been proved to have weak adsorption systems in previous work, we first analyze the suitability of combining OsSe 2 and Os by density functional theory (DFT) calculations. Excitingly, the Os-OsSe 2 hetero-structure with a neutralized WF value achieves a perfect pairing of strong and weak adsorbers.…”