Bimetallic Ni-Co nanoparticles on SiO2 as robust catalyst for CO methanation: Effect of homogeneity of Ni-Co alloy

Zhao, Binran; Liu, Peng; Li, Sha; Shi, Haofeng; Jia, Xianzhi; Wang, Qianqian; Yang, Fan; Song, Zhiwen; Guo, Chao; Hu, Jun; Chen, Zhong; Yan, Xiaoliang; Ma, Xiaoxun

doi:10.1016/j.apcatb.2020.119307

Cited by 74 publications

(31 citation statements)

References 47 publications

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“…Co is another transition metal commonly used to prepare bimetallic NiCo catalysts for CO 2 methanation. Co is right adjacent to Ni in the periodic table, it can dissolve into the lattice of metallic Ni similarly to Fe and its easy transition between the oxidation states of Co(III), Co(II) and Co 0 can induce modifications to the electronic properties of Ni-based catalysts [ 24 , 78 ]. Among the first works, Guo et al [ 79 ] prepared several bimetallic NiCo catalysts supported on SiO 2 with different Co/Ni ratios.…”

Section: Promotion With Transition Metalsmentioning

confidence: 99%

“…They found that higher Co loadings improved the activity of the catalysts and that a Co/Ni ratio of 0.4 led to the best performing catalyst. The formation of a homogeneous NiCo alloy supported on SiO 2 has also been shown to promote CO dissociation and hydrogen spillover during CO methanation, leading to higher activity [ 78 ].…”

Section: Promotion With Transition Metalsmentioning

confidence: 99%

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Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

et al. 2020

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CO2 methanation has recently emerged as a process that targets the reduction in anthropogenic CO2 emissions, via the conversion of CO2 captured from point and mobile sources, as well as H2 produced from renewables into CH4. Ni, among the early transition metals, as well as Ru and Rh, among the noble metals, have been known to be among the most active methanation catalysts, with Ni being favoured due to its low cost and high natural abundance. However, insufficient low-temperature activity, low dispersion and reducibility, as well as nanoparticle sintering are some of the main drawbacks when using Ni-based catalysts. Such problems can be partly overcome via the introduction of a second transition metal (e.g., Fe, Co) or a noble metal (e.g., Ru, Rh, Pt, Pd and Re) in Ni-based catalysts. Through Ni-M alloy formation, or the intricate synergy between two adjacent metallic phases, new high-performing and low-cost methanation catalysts can be obtained. This review summarizes and critically discusses recent progress made in the field of bimetallic Ni-M (M = Fe, Co, Cu, Ru, Rh, Pt, Pd, Re)-based catalyst development for the CO2 methanation reaction.

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Section: Promotion With Transition Metalsmentioning

confidence: 99%

Section: Promotion With Transition Metalsmentioning

confidence: 99%

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

et al. 2020

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“…[4] To date, substantial effort has been dedicated to exploring excellent electrocatalysts for CO or CO 2 methanation, such as Cu 2 O quantum dots on metal-organic framework, [5] single Zn atoms supported on microporous N-doped carbon, [6] MoP nanoparticles, [7] and bimetallic NiÀ Co nanoparticles. [8] However, there still exist many unresolved issues, such as low concentration of active sites, poor selectivity, and low activity. Seeking excellent electrocatalysts for CO methanation remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS₂ and WS₂

et al. 2021

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CO methanation from electrochemical CO reduction reaction (CORR) is significant for sustainable environment and energy, but electrocatalysts with excellent selectivity and activity are still lacking. Selectivity is sensitive to the structure of active sites, and activity can be tailored by work function. Moreover, intrinsic active sites usually possess relatively high concentration compared to artificial ones. Here, antisite defects Mo S2 and W S2 , intrinsic atomic defects of MoS 2 and WS 2 with a transition metal atom substituting a S 2 column, were investigated for CORR by density functional theory calculations. The steric hindrance from the special bowl structure of Mo S2 and W S2 ensured good selectivity towards CO methanation. Coordination environment variation of the active sites, the undercoordinated Mo or W atoms, effectively lowered the work function, making Mo S2 and W S2 highly active for CO methanation with the required potential of À 0.47 and À 0.49 V vs. reversible hydrogen electrode, respectively. Moreover, high concentration of active sites and minimal structural deformation during the catalytic process of Mo S2 and W S2 enhanced their attraction for future commercial application.

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“…It should be emphasized that, despite the relative softening, the nanoparticles’ strength remains on the level of tens of GPa. This combination of ultra-high strength and increased toughness can make the alloy nanoparticles promising candidates for many technological, biological, and medical applications 27 – 29 , including nanoelectronics 30 , nanomagnetics 31 , 32 , and catalysis 33 , 34 . In particular, the catalytic activity of metallic nanoparticles can be optimized by strain engineering 35 – 37 .…”

Section: Discussionmentioning

confidence: 99%

The impact of alloying on defect-free nanoparticles exhibiting softer but tougher behavior

Bisht

Koju

et al. 2021

Nat Commun

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The classic paradigm of physical metallurgy is that the addition of alloying elements to metals increases their strength. It is less known if the solution-hardening can occur in nano-scale objects, and it is totally unknown how alloying can impact the strength of defect-free faceted nanoparticles. Purely metallic defect-free nanoparticles exhibit an ultra-high strength approaching the theoretical limit. Tested in compression, they deform elastically until the nucleation of the first dislocation, after which they collapse into a pancake shape. Here, we show by experiments and atomistic simulations that the alloying of Ni nanoparticles with Co reduces their ultimate strength. This counter-intuitive solution-softening effect is explained by solute-induced local spatial variations of the resolved shear stress, causing premature dislocation nucleation. The subsequent particle deformation requires more work, making it tougher. The emerging compromise between strength and toughness makes alloy nanoparticles promising candidates for applications.

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Bimetallic Ni-Co nanoparticles on SiO2 as robust catalyst for CO methanation: Effect of homogeneity of Ni-Co alloy

Cited by 74 publications

References 47 publications

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS₂ and WS₂

The impact of alloying on defect-free nanoparticles exhibiting softer but tougher behavior

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Bimetallic Ni-Co nanoparticles on SiO2 as robust catalyst for CO methanation: Effect of homogeneity of Ni-Co alloy

Cited by 74 publications

References 47 publications

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS2 and WS2

The impact of alloying on defect-free nanoparticles exhibiting softer but tougher behavior

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Steric Hindrance‐ and Work Function‐Promoted High Performance for Electrochemical CO Methanation on Antisite Defects of MoS₂ and WS₂