Template-assisted synthesis of single-atom catalysts supported on highly crystalline vanadium pentoxide for stable oxygen evolution

Youn, Chulmin; Shin, Seoyoon; Shin, Kihyun; Kim, Chanhoon; Park, Chae-Lin; Choi, Joonmyung; Kim, Shi Hyeong; Yeo, Sang Young; Shin, Moo Whan; Henkelman, Graeme; Yoon, Ki Ro

doi:10.1016/j.checat.2022.03.017

Cited by 13 publications

(17 citation statements)

References 93 publications

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“…34,49 Similar results regarding the effect of B-doping were observed via the XRD patterns. Two distinctive peaks were observed and marked as (002) and (10), which were closely associated with the crystallinity of graphite (Figure 3b). 50,51 For pristine ACs, weak intensity and broad (002) and (10) peaks were observed, and which intensity was gradually stronger and sharper after B-doping.…”

Section: Resultsmentioning

confidence: 99%

“…The increase of O species in both Co-B22 and Co-H22 is attributed to the formation of an OER active phase on the surface of cobalt, that is, hydroxide−oxyhydroxide. 59 In particular, the excellent durability of Co-B22 was prominent in the long-term stability evaluation performed using chronoamperometry at 1.6 V. 60 The current density of Co-B22 exhibited only a 22.68% degradation after continuous testing for 30 h (Figure 6h), whereas commercial IrO 2 and Co-H22 exhibited much faster degradation rates (of 44.05 and 33.92%, respectively). This observation indicated that the Bdoped carbon sites in corrosion-resistant B22 could provide stable anchoring sites for the Co atoms, affording high catalytic activity without severe performance degradation.…”

Section: Resultsmentioning

confidence: 99%

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Boron-Doped Activated Carbon Supports for Cobalt-Catalyzed Oxygen Evolution in Alkaline Electrolyte

Wee

Shin

Kim

et al. 2023

ACS Appl. Mater. Interfaces

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Activated carbons (ACs) are the most widely used and attractive support materials for electrocatalytic applications because of their significant surface areas, high electrical conductivities, and moderate affinities toward supported metal catalysts. However, the corrosive behavior of ACs at oxidative potentials causes an inevitable reduction in the active surface area of supported catalysts, resulting in the continuous deterioration of their electrocatalytic performance. Therefore, the introduction of corrosionresistant durable catalyst supports is essential for sustainable and efficient electrocatalysis. Here, we modified ACs to obtain different boron (B)-doped structures via doping-temperature controls to investigate the corrosion resistance of B-doped ACs. With increasing doping temperature, the B-doped ACs exhibited a decreased defect density and enhanced crystallinity owing to the accelerating dopant-induced graphitization. We found that the substitution of B atoms into the carbon lattice improved the structural integrity of the carbon structure, and cyclic voltammetry (CV) tests suggested that the highly B-substituted structures caused electrochemical surface passivation against carbon corrosion. Moreover, B-doped ACs significantly contributed to the increase in loading mass of cobalt (Co)-based catalyst on them and the electrochemical durability toward the oxygen evolution reaction as catalyst-support hybrid. The B22 (B-doped AC obtained at a 2200 °C B-doping temperature)-supported Co catalyst with the lowest oxidation current exhibited a voltage change of 32 mV at a current density of 10 mA/cm 2 (ΔE j=10 ) after 10,000 cycles, which was a factor of ∼7 higher cycle durability and stability than that of the conventional IrO 2 catalyst (ΔE j=10 = 205 mV). Here, we propose that surface engineering by B-doping to improve the structural integrity of ACs is an attractive method for designing durable electrocatalytic support materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Boron-Doped Activated Carbon Supports for Cobalt-Catalyzed Oxygen Evolution in Alkaline Electrolyte

Wee

Shin

Kim

et al. 2023

ACS Appl. Mater. Interfaces

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“…[ 24–26 ] Those properties make vanadium oxides significant in many fields such as pseudocapacitor, [ 27 ] rechargeable battery, [ 28 ] gas sensor, [ 29 ] and electrocatalyst. [ 24 ] In particular, V 2 O 5 ∙nH 2 O is an accessibility candidate for metal ions insertion and diffusion by dissociation of H 2 O. [ 28 ] The previous report has demonstrated that Co ions doping into interlayer spacing of V 2 O 5 delivered a high‐performance OER catalyst.…”

Section: Introductionmentioning

confidence: 99%

Activating Co(OH)₂ Active Sites by Coupled with V₂O₅ to Boost Highly Efficient Oxygen Evolution Reaction

Tang

Ruan

et al. 2023

Advanced Sustainable Systems

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Electrocatalytic water splitting generated oxygen (O2) and hydrogen (H2) is a promising way to solve the energy crisis. Oxygen evolution reaction (OER) compared to hydrogen evolution reaction (HER) has slow kinetics hindering overall process. Recently, cobalt hydroxide (Co(OH)2) with high activity and stability for OER has attracted more attention. During the OER process, the Co2+ in Co(OH)2 is further oxidized to Co3+ and CoOOH species are true active sites. However, the low conductivity of Co(OH)2 hinders its oxidization to CoOOH. In addition, spontaneous growth of Co(OH)2 agglomerates easily during hydrothermal treatment, leading to decreased active sites. Herein, an efficient strategy is developed to construct highly dispersive Co(OH)2 nanosheets vertically grown on V2O5 nanoflowers (Co(OH)2/V2O5) at room temperature. The V5+ of V2O5 can oxidize Co2+ of Co(OH)2 into Co3+, resulting in in situ formations of CoOOH species favorable to the OER process. In situ Raman also investigates that the OH‐ species are inserted more easily into the interlayer of Co(OH)2 of (Co(OH)2/V2O5) than that of pure Co(OH)2. Therefore, the hybrid Co(OH)2/V2O5 exhibits low overpotentials of 320 and 370 mV at a current density of 10 and 50 mV cm‐2, respectively, and a small Tafel slope of 68 mV dec‐1.

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“…Control over the microstructure and speci c morphology of nanostructures is the most important bene t of templating to confer bene cial properties on the resultant materials (Lamm et al 2021;Yang et al 2021). Recently, nanocellulose, including cellulose nano bers (CNFs) and cellulose nanocrystals (CNCs), as a renewable and naturally abundant nanoscale template, has attracted signi cant research interest in the synthesis of advanced functional nanomaterials for nextgeneration energy applications (Moon et al 2011;Youn et al 2022;Xu et al 2021). In general, nanocellulose exhibits a number of unique properties such as the anisotropic shape, the large speci c surface area and the controllable surface chemistry (Eyley and Thielemans 2014; Merindol et al 2020;Yamaguchi et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Youn et al 2022). The crystalline phases and morphologies of NOVs synthesized by TCNC-templated hydrothermal synthesis strongly depend on the TCNC contents and the process temperatures, as shown schematically inFig 1.…”

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confidence: 99%

One-dimensional nanostructured vanadium oxides with single-crystalline structure synthesized by cellulose nanocrystal-template-assisted hydrothermal method for Li-ion battery cathodes

Youn

et al. 2022

Preprint

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Cellulose nanocrystals (CNCs) have emerged as a promising templating material due to unique features, such as high surface area, surface hydroxyl groups and rod-like shape, which allow for sustainable nanoscale control of advanced functional materials. Especially, such high surface functionality and specific morphology can be imparted on the resultant nanomaterials with beneficial properties during templating. Here, we present synthesis of one-dimensional (1D) nanostructured vanadium oxides (NVOs), such as VO2(B) and V2O5‧nH2O nanobelts (NBs), with single- crystalline by hydrothermal treatment using CNCs as a sacrificial template. Importantly, the single-crystal vanadium oxide nanobelts exhibits the enhanced electrochemical performance of Li ion batteries with high specific capacity (>300 mAh/g) and long lifespan (>244 mAh/g at 50 cycles) compared to the polycrystalline nanoflakes (NFs) counterpart. Furthermore, we suggest that during hydrothermal treatment the sacrificial CNCs template-derived carbon is beneficial for electron transfer in cathode materials. Thus, we demonstrate that the utilization of CNCs templating to develop novel single-crystalline oxide cathode nanomaterials can provide a fruitful pathway for extraordinary electrochemical performance of next-generation alkaline batteries.

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Template-assisted synthesis of single-atom catalysts supported on highly crystalline vanadium pentoxide for stable oxygen evolution

Cited by 13 publications

References 93 publications

Boron-Doped Activated Carbon Supports for Cobalt-Catalyzed Oxygen Evolution in Alkaline Electrolyte

Boron-Doped Activated Carbon Supports for Cobalt-Catalyzed Oxygen Evolution in Alkaline Electrolyte

Activating Co(OH)₂ Active Sites by Coupled with V₂O₅ to Boost Highly Efficient Oxygen Evolution Reaction

One-dimensional nanostructured vanadium oxides with single-crystalline structure synthesized by cellulose nanocrystal-template-assisted hydrothermal method for Li-ion battery cathodes

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Template-assisted synthesis of single-atom catalysts supported on highly crystalline vanadium pentoxide for stable oxygen evolution

Cited by 13 publications

References 93 publications

Boron-Doped Activated Carbon Supports for Cobalt-Catalyzed Oxygen Evolution in Alkaline Electrolyte

Boron-Doped Activated Carbon Supports for Cobalt-Catalyzed Oxygen Evolution in Alkaline Electrolyte

Activating Co(OH)2 Active Sites by Coupled with V2O5 to Boost Highly Efficient Oxygen Evolution Reaction

One-dimensional nanostructured vanadium oxides with single-crystalline structure synthesized by cellulose nanocrystal-template-assisted hydrothermal method for Li-ion battery cathodes

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Activating Co(OH)₂ Active Sites by Coupled with V₂O₅ to Boost Highly Efficient Oxygen Evolution Reaction