Highly Dispersive Cobalt Oxide Constructed in Confined Space for Oxygen Evolution Reaction

Gu, Meng‐Xuan; Kou, Yu; Qi, Shi‐Chao; Shao, Ming-Qi; Yue, Ming Bo; Liu, Xiaoqin; Sun, Lin‐Bing

doi:10.1021/acssuschemeng.8b06214

Cited by 32 publications

(19 citation statements)

References 42 publications

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“…This effect can increase the reactivity and selectivity of a variety of thermal reactions including the Fischer−Tropsch synthesis, 32 asymmetric hydrogenation, 34 and CO oxidation. 29,35 Recently, space confinement has been applied to various electrocatalytic reactions including the HER, 30,36 hydrogen oxidation reaction (HOR), 37 CO 2 RR, 31 oxygen evolution reaction (OER), 38 oxygen reduction reaction (ORR), 39 CO oxidation, 40 and alcohol oxidation. 41 For example, Loh and coworkers have reported a novel method to confine platinum nanoparticles in a molybdenum disulfide-layered structure and demonstrated that this material exhibits improved activity and stability toward the HER compared to the commercial Pt/C catalyst.…”

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confidence: 99%

Improving CO₂ Electrochemical Reduction to CO Using Space Confinement between Gold or Silver Nanoparticles

Chang

Jian

Jeong

et al. 2020

J. Phys. Chem. Lett.

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Developing electrocatalysts that are stable and efficient for CO 2 reduction is important for constructing a carbon-neutral energy cycle. New approaches are required to drive input electricity toward the desired CO 2 reduction reaction (CO 2 RR) rather than the competitive hydrogen evolution reaction (HER). In this study, we have used quantum mechanics to demonstrate that the space confinement formed in the gaps of adjacent gold or silver nanoparticles can be used to improve the Faradaic efficiency of CO 2 RR to CO. This behavior is due to the space confinement stabilizing *COOH, which is the key intermediate in the CO 2 RR. However, space confinement has almost no effect on *H, which is the key intermediate in the HER. Possible experimental approaches for the preparation of this type of gold or silver electrocatalyst have been proposed.

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confidence: 99%

Improving CO₂ Electrochemical Reduction to CO Using Space Confinement between Gold or Silver Nanoparticles

Chang

Jian

Jeong

et al. 2020

J. Phys. Chem. Lett.

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“…In contrast, there are reports on detrimental electrocatalytic activity of a Co doped Ni catalyst toward methanol oxidation. This may be due to the presence of Co that has a metallic phase rather than an oxide phase, and it is well-known that CoO/Co 3 O 4 are better catalysts for OER than the metallic phase. ,, To confirm this proposed mechanism, Ni-Co-PIR-600, Ni-Co-PIR-800, and Ni-Co-PIR-1000 samples were subjected to MOR in an electrolyte of 0.1 M KOH with 0.1 M CH 3 OH. As discussed earlier, upon pyrolysis from 600 to 1000 °C the chemical composition of Ni-Co-PIR samples varied gradually from metallic Ni and Co to the oxide forms (NiO and CoO).…”

Section: Results and Discussionmentioning

confidence: 98%

Transition Metal Ions Assisted Trimerization of Polyisocyanurate and Their Pyrolyzed Derivatives as Synergistic Electrocatalysts for Oxidation of Alcohols

Chandrasekaran

2019

ACS Sustainable Chem. Eng.

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We demonstrate the trimerization of polyisocyanurate nanoporous foams by reacting aromatic isocyanate in the presence of transition metal salts (NiCl 2 •2H 2 O and CoCl 2 •6H 2 O) as catalysts. The metal ions were found to accelerate the gelation of the polyisocyanurate networks. The nickel−cobalt−polyisocyanurate (Ni-Co-PIR-RT) hybrid monoliths were pyrolyzed under inert atmosphere at varying temperatures (from 600 to 1000 °C) to yield oxide and metallic forms of Ni and Co with significant carbon content. Pyrolysis of Ni-Co-PIR-RT at 600 °C (Ni-Co-PIR-600) resulted in the complete reduction of Ni and Co ions to metallic Ni and Co, whereas samples pyrolyzed at 800 °C (Ni-Co-PIR-800) resulted in the partial transformation of the metallic Ni and Co to its respective oxides. The complete transformation of metallic Co to CoO was obtained at 1000 °C (Ni-Co-PIR-1000) with a significant amount of metallic Ni and NiO. The Ni-PIR-1000 sample displayed minimal activity toward methanol oxidation reaction (MOR) with an onset potential and maximum current density of 1.44 V (vs reversible hydrogen electrode) and 0.6 mA/cm 2 respectively, whereas the Co-PIR-1000 sample displayed oxygen evolution reaction (OER) at an onset potential of 1.33 V with no evident activity toward MOR in 0.1 M KOH with 0.2 M CH 3 OH. On the other hand, under the same conditions Ni-Co-PIR-1000 displayed 5 manifold increase in current density and reduction in onset potential by 100 mV toward MOR (with an onset potential of 1.34 V and current density 4 mA/cm 2 ) relative to Ni-PIR-1000. The synergistic and superior activity of Ni-Co-PIR-1000 can be attributed to the combined presence of Ni, NiO, and CoO. Here, (1) Ni and NiO act as the catalysts for methanol oxidation by electrochemically transforming to NiOOH (active centers for methanol oxidation) via Ni(OH) 2 , (2) the presence of CoO facilitates the electrochemical generation of atomic oxygen ([O]) (an intermediate in oxygen evolution reaction and a wellknown oxidizing agent) by transforming to CoOOH, the [O] formed here may be responsible for the formation of NiOOH by chemically reacting with Ni(OH) 2 resulting in increased activity toward MOR.

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“…Many attempts have been made so far in confining a catalyst to enhance its performance. [38,72,73,108,112,113] In this regard, the work of Z. Chen et al [38] illustrates the general approach (Figure 4d) to confine zerovalent metals in vdW gaps of layered 2D MoS 2 and elucidates their enhanced electro catalytic activities toward HER in 0.5 m H 2 SO 4 solution. Figure 7a reports the linear sweep voltammetry curves for Pt, Ru, Pd, Au confined in vdW gaps of MoS 2 .…”

Section: Water Splitting Reactionsmentioning

confidence: 99%

“…The same trend has also been observed in confining Co 3 O 4 in porous sites of mesoporous silica. [113] The confined Co 3 O 4 nanoparticles exhibited higher catalytic activity toward OER as compared to conventionally synthesized mere mixture of Co [38] Copyright 2017, Nature Publishing Group. b) Reproduced with permission.…”

Section: Water Splitting Reactionsmentioning

confidence: 99%

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Confined Catalysis: Progress and Prospects in Energy Conversion

Shifa

Vomiero

2019

Advanced Energy Materials

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Space confined catalysis has emerged as viable strategy for achieving potent and efficient catalysts in various important reactions. It offers a means of creating unique nanoscale chemical environments partitioned from the surrounding bulk space. This gives rise to the phenomena of nanoconfinement, where the energetics and kinetics of catalytic reactions can be modulated upon confining the catalysts in a particular site. Various scaffolds have been reported so far for confinement. Among these, void spaces under the cover of 2D materials, van der Waals (vdW) gaps of layered 2D materials, nanotubes, and porous surfaces have recently won copious attention. In this review, the concept of space confinement with respect to its effect on the electronic and structural properties of a catalyst is discussed. Emphasis is devoted to the catalysis of water splitting and CO2 reduction reactions. The progress in the design and applications of space confined catalysts is then traced. Finally, a discussion of emerging issues yet to be explored for this strategy to achieve a high efficiency, and future directions with the potential to become a new hotspots are presented.

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Highly Dispersive Cobalt Oxide Constructed in Confined Space for Oxygen Evolution Reaction

Cited by 32 publications

References 42 publications

Improving CO₂ Electrochemical Reduction to CO Using Space Confinement between Gold or Silver Nanoparticles

Improving CO₂ Electrochemical Reduction to CO Using Space Confinement between Gold or Silver Nanoparticles

Transition Metal Ions Assisted Trimerization of Polyisocyanurate and Their Pyrolyzed Derivatives as Synergistic Electrocatalysts for Oxidation of Alcohols

Confined Catalysis: Progress and Prospects in Energy Conversion

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Highly Dispersive Cobalt Oxide Constructed in Confined Space for Oxygen Evolution Reaction

Cited by 32 publications

References 42 publications

Improving CO2 Electrochemical Reduction to CO Using Space Confinement between Gold or Silver Nanoparticles

Improving CO2 Electrochemical Reduction to CO Using Space Confinement between Gold or Silver Nanoparticles

Transition Metal Ions Assisted Trimerization of Polyisocyanurate and Their Pyrolyzed Derivatives as Synergistic Electrocatalysts for Oxidation of Alcohols

Confined Catalysis: Progress and Prospects in Energy Conversion

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Improving CO₂ Electrochemical Reduction to CO Using Space Confinement between Gold or Silver Nanoparticles

Improving CO₂ Electrochemical Reduction to CO Using Space Confinement between Gold or Silver Nanoparticles