Ru Atoms Research Articles

Effect of Re/Ru on constituents distribution and creep performance of nickel-based single crystal alloys

ABSTRACT The effects of Re/Re on the element distribution and creep performance of nickel-based single crystal alloy by using atom probe tomography (APT) and creeping property testing has been studied. Results show that the elements Re, Ru, W, Mo, Cr, and Co are the former of γ phase; the elements are distributed in γ and γ‘ phases of two alloys according to various ratios. Some of the Ru atoms in Re-containing alloy make more Al, Ta atoms are dissolved in γ matrix and make more Mo, W, and Re atoms dissolving in γ‘ phase, which increases the alloying degree of γ“, γ phases to enhance the strength and creep resistance of alloy. Particularly, the Re and W atoms dissolved in γ” phase are excluded, during creep, for the enrichmrnt in γ phase near the interface to form their peak content; the lattice distortion coming from the enriched Re and W atoms restrains dislocations gliding to delay the γ’ phase from being sheared. The deformed mechanisms of alloy in the later stage of creep are the dislocations gliding in γ phase and shearing γ’ phase. Wherein, the dislocations of shearing γ’ phase are both glided on {111} planes and cross-glided from {111} to {001} planes to form the KW locks, the ones that restrain the gliding and cross-gliding of dislocations for improving the creep resistance of alloy. While the interaction of the Ru with Re and W atoms make some Reand W atoms reserved in the γ′ phase to delay the diffusion of other elements, which prevents the KW locks from being released, to keep the good resistance of alloy.

Single Ru atoms confined into MOF/C3N4 for dual improved photocatalytic carbon dioxide reduction and nitrogen fixation

Photocatalytic carbon dioxide reduction reaction (CO2RR) and nitrogen reduction reaction (NRR) are two promising directions in new energy development. However, the majority of studies thus far have focused on a single reaction of catalysts (CO2RR or NRR). Herein, we have in-situ synthesized Ru/MOF/C3N4 catalyst by confining the Ru single atom in Metal organic framework (MOF). We separately characterize the photocatalytic CO2RR and NRR of the catalysts (CO2RR: gas–solid mode; NRR: liquid–solid mode) and find that Ru/MOF/C3N4 exhibits excellent catalytic activities and recyclability in both CO2RR and NRR. The presence of Ru single atoms results in energy levels in the bandgap of MOF, which prevents the formation of electron-hole complex and increases the concentration of photogenerated carriers. In addition, it hinders the hydrogen evolution reaction (HER) and reduces the Gibbs free energy of the CO2RR and NRR. These results provide not only insights into promoting the activity of single-atom catalysts in a dual-catalytic system but also guidance for future studies on direct air photocatalysis.

In Situ Characterizations Revealing Ruthenium‐Atom‐Induced Raise of Photocatalytic Performance

AbstractRational design/fabrication of high‐activity photocatalysts is of central importance to realize solar‐to‐chemical conversion for tackling worldwide energy/environmental issues. Hence, it is desirable to disclose the element/space/time‐resolved charge kinetics and surface species evolution of photocatalysts under realistic conditions using various in situ characterizations. Furthermore, the correlation of the above‐disclosed mechanisms with atomic‐scale compositions/structures of photocatalysts can further direct the atomic‐level design/synthesis of high‐performance photocatalysts. Herein, Ru atoms incorporated CdS quantum dots (QDs) are synthesized using an in situ hot‐injection route. The optimized Ru incorporated CdS QDs (Ru0.1) exhibit excellent photocatalytic evolution rates of H2O2 (8.78 mmol g−1 h−1) and benzaldehyde (11.70 mmol g−1 h−1), respectively. Four different in situ characterizations demonstrate that in realistic conditions, the incorporated Ru atoms with high oxidation state (+3) effectively attract photo‐generated electrons from bulk to the overall surface of Ru0.1; these directed electron flows also greatly facilitate the transfer of photo‐generated holes from bulk to surface of Ru0.1 via efficiently reducing electron‐hole recombination. in situ diffuse reflectance infrared Fourier transform spectroscopy, electron spin spectroscopy, and species‐trapping experiments further reveal three possible reaction pathways for H2O2 evolution. This work underscores the use of in situ characterizations to reveal the element/space/time‐resolved electrons/holes kinetics and surface‐species generation for photocatalysts in realistic conditions.

Synthesis, physical properties and hardness of a novel YCrB4-type high-entropy boride

The YCrB4-type structure is analogous to the AlB2-type one and exists for wide combinations of rare earth and transition metal elements. However, contrary to the large number of AlB2-type high-entropy borides (HEBs), no YCrB4-type HEB has been reported to date. Here, a new 10-cation HEB (Y0.2Dy0.2Ho0.2Tb0.2Lu0.2)(Cr0.2Mo0.2W0.2Re0.2Ru0.2)B4 is synthesized and characterized by x-ray diffraction, electron microscopy, resistivity, magnetic and microhardness measurements. Structural analysis indicates that the HEB is the first member of the orthorhombic YCrB4-type structure family [space group Pbam, a = 5.976(1) Å, b = 11.558(1) Å, c = 3.550(1) Å]. In the cation sublattice, the rare earth (Y, Dy, Ho, Tb, Lu) and transition metal (Cr, Mo, W, Re, Ru) atoms occupy two different cation sites, leading to a remarkably large configurational entropy of 3.22R. This YCrB4-type HEB exhibits paramagnetic and metallic behaviors at high temperature. On cooling to low temperatures, the resistivity shows an upturn below 30 K and a ferromagnetic transition occurs at 6.7 K. In addition, the Vickers hardness of the HEB reaches 23.2 GPa at a load of 0.49 N and 16.4 GPa at a load of 9.8 N. Our work expands both the structural and property diversity of the HEBs.

Single-atoms Ru/NiFe layered double hydroxide electrocatalyst: Efficient for oxidation of selective oxidation of 5-hydroxymethylfurfural and oxygen evolution reaction

The adsorption performance modulation of catalysts on reactants is effective for the improvement of catalytic oxidation reactions. Ru is beneficial for adsorption of products. Here, the single Ru atoms were supported on NiFe layered double hydroxide (LDH) (Ru0.3/NiFe) to enhance the adsorption capacity of catalyst using a two-step electrodeposition method. Ru0.3/NiFe was used in the oxygen evolution reaction (OER) and the selective oxidation of 5-hydroxymethylfurfural (HMFOR). Ru0.3/NiFe showed extremely low overpotential (243 mV at 10 mA cm-2) and excellent durability in OER. Ru0.3/NiFe exhibits excellent HMF conversion (99.43%), 2,5-furan dicarboxylic acid (FDCA) selectivity (99.24%) and yield (98.68%) in HMFOR. The possible HMFOR reaction pathway was further studied, revealing that the load of Ru enhances the path from HMF to DFF, thereby improving the yield of FDCA. Both the outcomes of experimental findings and density functional theory (DFT) calculations indicate that increasing the composition of Ru optimizes the adsorption energy of HMF compared to NiFe, allowing FeNiOOH to more efficiently capture protons and electrons in HMFOR.

Direct Dioxygen Radical Coupling Driven by Octahedral Ruthenium-Oxygen-Cobalt Collaborative Coordination for Acidic Oxygen Evolution Reaction.

The acidic oxygen evolution reaction (OER) has long been the bottleneck of proton exchange membrane water electrolyzers given its harsh oxidative and corrosive environments. Herein, we suggest an effective strategy to greatly enhance both the acidic OER activity and stability of Co3O4 spinel by atomic Ru selective substitution on the octahedral Co sites. The resulting highly symmetrical octahedral Ru-O-Co collaborative coordination with strong electron coupling effect enables the direct dioxygen radical coupling OER pathway. Indeed, both experiments and theoretical calculations reveal a thermodynamically breakthrough heterogeneous diatomic oxygen mechanism. Additionally, the active Ru-O-Co units are well-maintained upon the acidic OER thanks to the electron transfer from surrounding electron-enriched tetrahedral Co atoms via bridging oxygen bonds that suppresses the overoxidation and thus dissolution of active Ru and Co species. Consequently, the prepared catalyst, even with a low Ru mass loading of ca. 42.8 μg cm-2, exhibits an attractive acidic OER performance with a low overpotential of 200 mV and a low potential decay rate of 0.45 mV h-1 at 10 mA cm-2. Our work suggests an effective strategy to significantly enhance both the acidic OER activity and stability of low-cost electrocatalysts.

Atomization-Induced High Intrinsic Activity of a Biocompatible MgAl-LDH Supported Ru Single-Atom Nanozyme for Efficient Radicals Scavenging.

Developing efficient nanozymes to mimic natural enzymes for scavenging reactive radicals remains a significant challenge owing to the insufficient activity of conventional nanozymes. Herein, we report a novel Ru single-atom nanozyme (SAE), featuring atomically dispersed Ru atoms on a biocompatible MgAl-layered double hydroxide (Ru1 /LDH). The prepared Ru1 /LDH SAE shows high intrinsic peroxidase (POD)-like catalytic activity, which outperforms the Ru nanoclusters (NCs) nanozyme by a factor of 20 and surpasses most SAEs. The density functional theory calculations reveal that the high intrinsic POD-like activity of Ru1 /LDH can be attributed to a heterolytic path of H2 O2 dissociation on the single Ru sites, which requires lower free energy (0.43 eV) compared to the homolytic path dissociation on Ru NC (0.63 eV). In addition, the Ru1 /LDH SAE shows excellent multiple free radicals scavenging ability, including superoxide anion radical (O2 ⋅- ), hydroxyl radical (⋅OH), nitric oxide radical (NO⋅) and 2, 2-diphenyl-1-picrylhydrazyl radical (DPPH⋅). Given the advantages of Ru1 /LDH with high enzymatic activities, biosafety, and ease to scale up, it paves the way for exploring SAEs in the practical biological immunity system.

Atomization‐Induced High Intrinsic Activity of a Biocompatible MgAl‐LDH Supported Ru Single‐Atom Nanozyme for Efficient Radicals Scavenging

AbstractDeveloping efficient nanozymes to mimic natural enzymes for scavenging reactive radicals remains a significant challenge owing to the insufficient activity of conventional nanozymes. Herein, we report a novel Ru single‐atom nanozyme (SAE), featuring atomically dispersed Ru atoms on a biocompatible MgAl‐layered double hydroxide (Ru1/LDH). The prepared Ru1/LDH SAE shows high intrinsic peroxidase (POD)‐like catalytic activity, which outperforms the Ru nanoclusters (NCs) nanozyme by a factor of 20 and surpasses most SAEs. The density functional theory calculations reveal that the high intrinsic POD‐like activity of Ru1/LDH can be attributed to a heterolytic path of H2O2 dissociation on the single Ru sites, which requires lower free energy (0.43 eV) compared to the homolytic path dissociation on Ru NC (0.63 eV). In addition, the Ru1/LDH SAE shows excellent multiple free radicals scavenging ability, including superoxide anion radical (O2⋅−), hydroxyl radical (⋅OH), nitric oxide radical (NO⋅) and 2, 2‐diphenyl‐1‐picrylhydrazyl radical (DPPH⋅). Given the advantages of Ru1/LDH with high enzymatic activities, biosafety, and ease to scale up, it paves the way for exploring SAEs in the practical biological immunity system.

Atomic Ru coordinated by channel ammonia in V-doped tungsten bronze for highly efficient hydrogen-evolution reaction

Regulation of the atomic distribution is crucial for the development of atomically dispersed electrocatalysts. In this study, atomic Ru coordinated by channel ammonia in V-doped tungsten bronze (Ru/V-NHWO, Ru 0.44 wt%, V 0.45 wt%) was used as a high-performance catalyst for the hydrogen evolution reaction (HER), demonstrating remarkable mass activity in a wide pH range. Atomic Ru with a regulated spatial distribution and electronic structure was achieved owing to its unique coordination with the ammonia species in the hexagonal channels of V-NHWO. V doping in NHWO led to enhanced intrinsic activity and conductivity. Theoretical calculations revealed that the multichannel, vertically integrated Ru sites in the V-doped channels, as well as the coexisting Ru sites without multichannels or V-doping, improved the free energy of water dissociation and hydrogen sorption, which boosted the HER activity. Our study paves a new way for constructing atomically dispersed materials with a regulated spatial distribution for diverse applications.

Constructing built-in electric field via ruthenium/cerium dioxide Mott-Schottky heterojunction for highly efficient electrocatalytic hydrogen production

Ensuring the consumption rate of noble metals while guaranteeing satisfactory hydrogen evolution reaction (HER) performance at different pH values is imperative to the development of Ru-based catalysts. Herein, we design a Mott-Schottky electrocatalyst (Ru/CeO2) with a built-in electric field (BEF) based on density functional theory (DFT). The Ru/CeO2 achieves the criterion current density of 10 mA cm−2 at overpotentials of 55 mV, 80 mV, and 120 mV in alkaline, acidic and neutral media, respectively. Both theoretical calculations and experimental analysis confirm that the improved HER activity in the Ru/CeO2 catalyst could be due to the successful construction of BEF at the interface between the prepared Ru clusters and CeO2. Under the action of BEF, the electron-deficient Ru atoms can optimize the adsorption energy of H* and H2O and thus promote HER kinetics. Furthermore, the Ru/CeO2 catalyst delivers a power density of approximately 94.5 mW cm−2 in alkaline-acidic Zn-H2O cell applications while maintaining good H2 production stability. In this work, we optimize the electrocatalytic performance of the Ru/CeO2 catalyst through examination of the interfacial BEF electrical charge, which combines hydrogen production with power generation and provides a promising method for sustainable energy conversion.

Modulating adsorption of active hydrogen atoms on palladium nanoparticles: Doping ruthenium into metal–organic frameworks for efficient electrocatalytic hydrodechlorination

To simultaneously optimize the dispersion and electrocatalytic activity of palladium (Pd) nanoparticles, we report a novel Pd-NiRu-MOF/NF composite electrode with low noble metal dosage for electrocatalytic hydrodechlorination. The as-prepared electrode exhibits outstanding activity, particularly the complete dechlorination of 2-chlorophenol within 75 min at −0.85 V, outperforming reported state-of-the-art electrode materials. Moreover, the catalytic activity could be well-maintained after continuous five catalytic cycles and even 30-day exposure to air as well as deliver excellent catalytic performance for other priority chlorophenols. CO-stripping experiments demonstrate that the dispersion of Pd nanoparticles increases the electrochemically active surface area of Pd. X-ray photoelectron spectroscopy and density functional theory analysis disclose that the electronic structure of Pd is modulated via introducing Ru atoms into Pd-Ni-MOF/NF, thereby enhancing the adsorption of H*ads on Pd-NiRu-MOF/NF and boosting the electroreductive remediation of chlorophenols. Notably, the electrochemical dechlorination of chlorophenols remains effective in natural water or soil, indicating that Pd-NiRu-MOF/NF composite electrode has a good application potential in removing organic halides in wastewater or soil.

Unveiling Interfacial Effects for Efficient and Stable Hydrogen Evolution Reaction on Ruthenium Nanoparticles-Embedded Pentlandite Composites.

Heterogenous catalysis is important for future clean and sustainable energy systems. However, an urgent need to promote the development of efficient and stable hydrogen evolution catalysts still exists. In this study, ruthenium nanoparticles (Ru NPs) are in situ grown on Fe5 Ni4 S8 support (Ru/FNS) by replacement growth strategy. An efficient Ru/FNS electrocatalyst with enhanced interfacial effect is then developed and successfully applied for pH-universal hydrogen evolution reaction (HER). The Fe vacancies formed by FNS during the electrochemical process are found to be conducive to the introduction and firm anchoring of Ru atoms. Compared to Pt atoms, Ru atoms get easily aggregated and then grow rapidly to form NPs. This induces more bonding between Ru NPs and FNS, preventing the fall-off of Ru NPs and maintaining the structural stability of FNS. Moreover, the interaction between FNS and Ru NPs can adjust the d-band center of Ru NPs, as well as balance the hydrolytic dissociation energy and hydrogen binding energy. Consequently, the as-prepared Ru/FNS electrocatalyst exhibits excellent HER activity and improved cycle stability under pH-universal conditions. The developed pentlandite-based electrocatalysts with low cost, high activity, and good stability are promising candidates for future applications in water electrolysis.

On the role of metal cation in MXene in boosting the catalytic activity of single/double atom toward electrochemical NH3 production

In this study, we have engineered the MXene supports to boost the single and homo double atoms of Fe, Ru, and Os for efficient NH3 production via electrochemical nitrogen reduction reaction (N2RR) using DFT calculations. We designed the different MXene surfaces which are composed of nine early transition metals [M2CO2 (M = Cr, Hf, Mo, Nb, Ta, Ti, V, W, Zr)] and examined the activity/stability of single and homo double atoms by calculating the free energy diagram of N2RR, dissolution potential, and agglomeration energy. First, we found that the NH2 adsorption energy is the activity descriptor for representing the NH3 productivity and the density of state near the Fermi level of the single Ru atom is the important factor in determining N2RR activity. Next, our DFT calculation on the descriptor-based computational search for the novel MXene-based catalysts showed that among the chemically and electrochemically stable candidate catalysts, the homo double Ru2/Mo2CO2 catalyst showed the highest NH3 productivity with the high N2RR selectivity over hydrogen evolution reaction. In addition, the best Ru2/Mo2CO2 catalyst exhibited the intermediate density of state near the Fermi level, leading to the optimal descriptor value (NH2 adsorption strength) for NH3 production and in turn the reduction of overpotential for the electrochemical NH3 production. More fundamentally, we identified that the electron density near the Fermi level of these single or double atoms is closely correlated with the electron structure of the cationic metal atoms constituting MXene supports. Our study highlights the rational design of single and homo double atom catalysts by tuning the property of MXene supports, which provides insight into the key factors in enhancing NH3 production at ambient conditions.

Modulating Electronic Structure of PtCo-Ptrich Nanowires with Ru atoms for Boosted Hydrogen Evolution Catalysis.

Rational design and development of highly efficient hydrogen evolution reaction (HER) electrocatalysts is of great significance for the development of green water electrolysis hydrogen production technology. Ru-engineered 1D PtCo-Ptrich nanowires (Ru-Ptrich Co NWs) are fabricated by a facile electrodeposition method. The rich Pt surface on 1D Pt3 Co contributes to the fully exposed active sites and enhanced intrinsic catalytic activity (co-engineered by Ru and Co atoms) for HER. The incorporation of Ru atoms can not only accelerate the water dissociation in alkaline condition to provide sufficient H* but also modulate the electronic structure of Pt to achieve optimized H* adsorption energy. As a result, Ru-Ptrich Co NWs have exhibited ultralow HER overpotentials (η) of 8 and 112mV to achieve current densities of 10 and 100mA cm-2 in 1m KOH, respectively, which far exceed those of commercial Pt/C catalyst (η10 =29mV, η100 =206mV). Density functional theory (DFT) calculations further demonstrate that the incorporated Ru atoms possess strong water adsorption capacity (-0.52 vs -0.12eV for Pt), facilitating water dissociation. The Pt atoms in the outermost Pt-rich skin of Ru-Ptrich Co NWs achieve optimized H* adsorption free energy (ΔGH* ) of -0.08eV, boosting hydrogen generation.

Insights into boosting catalytic hydrogen evolution over Co doping Ru nanoparticles

Accurate regulation of surface chemical state on catalysts is crucial for achieving efficient performance but remains a major challenge. In this work, the lattice strain, d electronic state and ensemble effect of supported Ru catalysts are tuned via Co doping to boost the hydrogen evolution from ammonia borane (AB) hydrolysis. The optimized Ru0.6Co0.4/P25 composite displays outstanding catalytic performance with a turnover frequency of 443.7 min−1 in the absence of strong alkali. Experimental analysis and theoretical simulation reveal the boosting effect of RuCo alloy on the activation of AB originating from the compressed lattice strain, reduced d-band center of Ru via Co doping. The ensemble effect on optimized surface state leads to a bimolecular activation of H2O on Co atoms and AB on Ru atoms. Suitable adsorption strength of H* intermediates and reduced energy barrier of H2O dissociation induced by the electron interaction between Ru and Co atoms are responsible for the prominent catalytic activity over RuCo alloy. This research provides new insights into the catalytic mechanism and inspiration for the rational design of heterogeneous catalysts and energy storage materials.

D-Band Center Optimization of Edge-Rich Ultrathin RuZn Nanosheets With Moiré Superlattices for pH-Universal Hydrogen Evolution Reaction.

Electrocatalytic hydrogen evolution reaction (HER) is a promising way to produce pure and clean hydrogen. However, the preparation of efficient and economical catalysts for pH-universal HER remains a challenging but rewarding task. Herein, ultrathin RuZn nanosheets (NSs) with moiré superlattices and abundant edges are synthesized. The RuZn NSs with unique structure exhibit superb HER performance with overpotentials of 11, 13, and 29mV to achieve 10mA cm-2 in 1M KOH, 1M PBS, and 0.5M H2 SO4 , respectively, which is substantially lower than those of Ru NSs and RuZn NSs without moiré superlattices. Density functional theory investigations reveal that the charge transfer from Zn to Ru will lead the appropriate downshift of the d-band center of surface Ru atoms, thus accelerating hydrogen desorption from the Ru sites, lowering the dissociation energy barrier of water and greatly improving the HER performance. This work provides an effective design scheme for high-performance HER electrocatalysts over a wide pH range, and propose a general route to prepare Ru-based bimetallic nanosheets with moiré superlattices.

Atomic Ru-modulated Ru-CoO heterostructures as efficient bifunctional electrocatalyst for oxygen and hydrogen evolution reactions

Regulating morphology and composition of catalysts is of grand importance to enhance their electrocatalytic activity in energy-related fields. Herein, an electrocatalyst of ruthenium-cobalt oxide (Ru-CoO) heterojunctions decorated with atomically dispersed Ru atoms is constructed with a simple and effective salt fractionation approach. The morphology and structure of the resulting Ru-CoO were analyzed using scanning electron microscopy, transmission electron microscopy, high-angle annular dark-field scanning transmission electron microscopy, powder X-ray diffraction, N2 sorption, and X-ray photoelectron spectroscopy, respectively. Owing to the synergistic contributions of heterostructured Ru-CoO with abundant interfaces and single atomic Ru at doping level, the resulted Ru-CoO exhibits excellent bifunctional electrocatalytic oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performances along with long-term durability under alkaline electrolytes. To attain a current density of 10 mA cm−2, the hybrid needs overpotentials of 340 and 359 mV for the OER and HER, respectively, excelling many reported catalysts to date. Importantly, this work paves a new route toward the development of efficient catalysts for the future of hydrogen economy.

First-principles study of Ti50Ru50-xYx (Y = Ni, Pd and Pt) with a prospect to induce SME on stable CsCl-type Ti50Ru50 phase

Most CsCl-type intermetallics composed of group IV and VIII–XI transition metals have shape memory effect (SME), a phenomenon that occurs on a certain class of materials with an ability to undergo martensitic transformation (MT) during cooling. This advanced functional materials’ property is enabled by MT from high-temperature B2 phase of high symmetry to lower symmetry phases such as L10, B19 or B19’ upon cooling. Peculiarly, Ti50Ru50 with similar ordered B2 at high temperature remains ordered and stable with no phase transition down to room temperature. In this study, first-principles calculations based on density functional theory (DFT) are used to investigate the structural, thermodynamic and electronic properties of the stable Ti50Ru50 compound by systematically substituting part of the Ru atoms with ductile group 10 metal (Ni, Pd and Pt). This is an attempt to destabilizing B2 phase at 0 K through Ti50Ru50-xYx ternary alloying to promote MT that could yield SME.Graphical

Adsorption and Surface Diffusion of Atomic Ru on TiN and SiO2: A First-Principles Study

Ruthenium (Ru) has been suggested as one of the promising materials for nanoscale interconnects to substitute copper (Cu) that is currently used in the semiconductor industry. Through density functional theory (DFT) calculations, we present the rationales for varying deposition behavior of Ru on different types of substrates. For the SiO2 and TiN substrates, with and without adsorbed hydrogen, our calculation results reveal the adsorption sites and their adsorption energy, the surface diffusion paths and their activation energy, and the surface diffusion coefficients. We confirm that the adsorption of Ru is more stable on TiN than on SiO2 substrates, and that the surface diffusion of Ru adatom is faster on TiN than on SiO2 surface.

Defect-Rich and Boron-Doped Al2O3-Supported Ru Nanocatalyst for Enhanced CO2 Methanation Activity

Presently, fabricating a stable and high-performance noble metal catalyst is still a challenging task due to the easy aggregation and growth of metal particles during heterogeneous catalysis reactions. In this regard, catalyst supports always can profoundly impact the metal dispersion and electronic interaction with active metal species, thereby significantly regulating the catalytic performance of catalysts. Herein, a new strategy for fabricating boron-doped alumina support with coordinatively unsaturated penta-coordinated Al3+ (Alpenta3+) sites via a micro-liquid-film reactor-assisted coprecipitation approach was developed. Accordingly, as-formed alumina could efficiently immobilize Ru atoms via the anchoring effect of the Alpenta3+ site to construct a supported Ru catalyst for CO2 methanation. An as-constructed Alpenta3+ site-rich and boron-doped Al2O3-supported Ru nanocatalyst exhibited a better catalytic performance in CO2 methanation along with a higher methane yield of 81.2% under reaction conditions (i.e., 350 °C, 0.1 MPa pressure, and gas hourly space velocity of 6000 mL·gcat–1·h–1), compared to other supported Ru ones over commercial alumina and defect-free alumina. It was demonstrated that the high catalytic performance was closely associated with the coexistence of surface-defective Alpenta3+ sites and B–O species, thereby facilitating the accommodation of active hydrogen species on the support during CO2 hydrogenation as well as the activation adsorption of CO2 at the medium-strength basic sites originating from surface B–O–Al structures. This work provides a new strategy to construct high-performance and stable supported noble metal catalysts through engineering alumina support with special defective structures and surface modification for the applications in advanced heterogeneous catalytic systems.