The latest development of CoOOH two-dimensional materials used as OER catalysts

Zhang, Shengqi; Yu, Tao; Wen, Hui; Ni, Zhiyuan; He, Yan; Guo, Rui; You, Jinyuan; Liu, Xuanwen

doi:10.1039/d0cc05876a

Cited by 65 publications

(43 citation statements)

References 70 publications

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“…Moreover, as seen from the Co K ‐edge FT‐EXAFS curves in Figure 5 b, an emerging peak located at around 2.35 Å, assigned to the contributions of Co‐Co/Cu bonds, is clearly observed for CoCu‐MOF NBs after the OER operation, compared with the initial one [26, 40] . Interestingly, both the Co K ‐edge k 2 χ( k ) oscillation and FT‐EXAFS curves of CoCu‐MOF NBs after the OER closely resemble to those of the γ‐CoOOH reference (Figure 5 a,b), indicating the formation of Co‐based oxyhydroxide analogue during the OER [40, 41] . More importantly, the Cu K ‐edge k 2 χ( k ) oscillation and FT‐EXAFS curves of CoCu‐MOF NBs after OER look very similar to that at Co K ‐edge (Figure S22, Supporting Information), which infers resembled structural configurations of Co and Cu sites in CoCu‐MOF NBs after OER.…”

Section: Figurementioning

confidence: 72%

“…This downshifting of metal d band center, induced by the Cu atom incorporation, could properly weaken the strong oxo‐species affinity of CoOOH, and then effectively balance the adsorption energetics of key intermediates toward fast OER kinetics for CoCuOOH. As illustrated by the Gibbs free energy changes in Figure 5 f, the formation of *OOH intermediate over Co sites of CoOOH has the largest thermodynamic barrier of 1.80 eV during the OER process, which indicates the O−O bond coupling is the OER rate‐determining step [41, 42] . Notably, the free energy change of *OOH intermediate formation is reduced to 1.68 eV for CoCuOOH after the Cu atom incorporation, which is responsible for the great promotion in the OER kinetics.…”

Section: Figurementioning

confidence: 95%

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Synergetic Cobalt‐Copper‐Based Bimetal–Organic Framework Nanoboxes toward Efficient Electrochemical Oxygen Evolution

et al. 2021

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The development of efficient oxygen electrocatalysts and understanding their underlying catalytic mechanism are of significant importance for the high‐performance energy conversion and storage technologies. Herein, we report novel CoCu‐based bimetallic metal–organic framework nanoboxes (CoCu‐MOF NBs) as promising catalysts toward efficient electrochemical oxygen evolution reaction (OER), fabricated via a successive cation and ligand exchange strategy. With the highly exposed bimetal centers and the well‐designed architecture, the CoCu‐MOF NBs show excellent OER activity and stability, with a small overpotential of 271 mV at 10 mA cm−2 and a high turnover frequency value of 0.326 s−1 at an overpotential of 300 mV. In combination of quasi in situ X‐ray absorption fine structure spectroscopy and density‐functional theory calculations, the post‐formed CoCu‐based oxyhydroxide analogue during OER is believed to account for the high OER activity of CoCu‐MOF NBs, where the electronic synergy between Co and neighbouring Cu atoms promotes the O−O bond coupling toward fast OER kinetics.

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Section: Figurementioning

confidence: 72%

Section: Figurementioning

confidence: 95%

Synergetic Cobalt‐Copper‐Based Bimetal–Organic Framework Nanoboxes toward Efficient Electrochemical Oxygen Evolution

et al. 2021

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“…[26,40] Interestingly, both the Co K-edge k 2 c(k) oscillation and FT-EXAFS curves of CoCu-MOF NBs after the OER closely resemble to those of the g-CoOOH reference (Figure 5 a,b), indicating the formation of Cobased oxyhydroxide analogue during the OER. [40,41] More importantly, the Cu K-edge k 2 c(k) oscillation and FT-EXAFS curves of CoCu-MOF NBs after OER look very similar to that at Co K-edge (Figure S22 [18,[42][43][44] Indeed, after the Cu atom incorporation, the d band centre of CoCuOOH has been greatly downshifted from À2.10 to À2.62 eV relative to CoOOH (Figure S25a,b, Supporting Information). It has been demonstrated that pure CoOOH usually shows moderate OER activity due to the excessively strong binding ability with oxo-intermediates during the oxygen catalytic process.…”

mentioning

confidence: 77%

“…As illustrated by the Gibbs free energy changes in Figure 5 f, the formation of *OOH intermediate over Co sites of CoOOH has the largest thermodynamic barrier of 1.80 eV during the OER process, which indicates the O À O bond coupling is the OER ratedetermining step. [41,42] Notably, the free energy change of *OOH intermediate formation is reduced to 1.68 eV for CoCuOOH after the Cu atom incorporation, which is responsible for the great promotion in the OER kinetics. It is also noteworthy that, for CoCuOOH, the Gibbs free energy change of *OOH generation over Co sites is much lower than that on Cu sites (2.15 eV; Figure S25c, Supporting Information), which may demonstrate Co sites are the real OER active sites in CoCuOOH.…”

mentioning

confidence: 99%

Synergetic Cobalt‐Copper‐Based Bimetal–Organic Framework Nanoboxes toward Efficient Electrochemical Oxygen Evolution

Cheng

Luan

et al. 2021

Angewandte Chemie

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The development of efficient oxygen electrocatalysts and understanding their underlying catalytic mechanism are of significant importance for the high-performance energy conversion and storage technologies. Herein, we report novel CoCu-based bimetallic metal-organic framework nanoboxes (CoCu-MOF NBs) as promising catalysts toward efficient electrochemical oxygen evolution reaction (OER), fabricated via a successive cation and ligand exchange strategy. With the highly exposed bimetal centers and the well-designed architecture, the CoCu-MOF NBs show excellent OER activity and stability, with a small overpotential of 271 mV at 10 mA cm À2 and a high turnover frequency value of 0.326 s À1 at an overpotential of 300 mV. In combination of quasi in situ Xray absorption fine structure spectroscopy and density-functional theory calculations, the post-formed CoCu-based oxyhydroxide analogue during OER is believed to account for the high OER activity of CoCu-MOF NBs, where the electronic synergy between Co and neighbouring Cu atoms promotes the O À O bond coupling toward fast OER kinetics.

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“…Inactive and low-cost materials as potential catalysts should be activated as high-performance OER electrocatalysts. In situ-generated active species (e.g., Co 3+ oxyhydroxides) after surface reconstruction can serve as main active sites, offering high activity capabilities [ 55 , 62 , 86 , 116 ]. The challenge is how rationally and precisely to initiate the surface reconstruction of inactive catalysts.…”

Section: Accelerating Surface Reconstructionmentioning

confidence: 99%

Tuning Reconstruction Level of Precatalysts to Design Advanced Oxygen Evolution Electrocatalysts

2021

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Surface reconstruction engineering is an effective strategy to promote the catalytic activities of electrocatalysts, especially for water oxidation. Taking advantage of the physicochemical properties of precatalysts by manipulating their structural self-reconstruction levels provide a promising methodology for achieving suitable catalysts. In this review, we focus on recent advances in research related to the rational control of the process and level of surface transformation ultimately to design advanced oxygen evolution electrocatalysts. We start by discussing the original contributions to surface changes during electrochemical reactions and related factors that can influence the electrocatalytic properties of materials. We then present an overview of current developments and a summary of recently proposed strategies to boost electrochemical performance outcomes by the controlling structural self-reconstruction process. By conveying these insights, processes, general trends, and challenges, this review will further our understanding of surface reconstruction processes and facilitate the development of high-performance electrocatalysts beyond water oxidation.

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The latest development of CoOOH two-dimensional materials used as OER catalysts

Abstract: The electrocatalytic water splitting, which is driven by renewable energy input to produce oxygen, has been widely regarded as a promising strategy in the future energy portfolio. The two-dimensional structure...

Cited by 65 publications

References 70 publications

Synergetic Cobalt‐Copper‐Based Bimetal–Organic Framework Nanoboxes toward Efficient Electrochemical Oxygen Evolution

Synergetic Cobalt‐Copper‐Based Bimetal–Organic Framework Nanoboxes toward Efficient Electrochemical Oxygen Evolution

Synergetic Cobalt‐Copper‐Based Bimetal–Organic Framework Nanoboxes toward Efficient Electrochemical Oxygen Evolution

Tuning Reconstruction Level of Precatalysts to Design Advanced Oxygen Evolution Electrocatalysts

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