Generation of Nanoparticle, Atomic‐Cluster, and Single‐Atom Cobalt Catalysts from Zeolitic Imidazole Frameworks by Spatial Isolation and Their Use in Zinc–Air Batteries

Han, Xiaopeng; Ling, Xiaofei; Wang, Ying; Ma, Tianyi; Zhong, Cheng; Hu, Wenbin; Deng, Yida

doi:10.1002/anie.201901109

Cited by 541 publications

(286 citation statements)

References 41 publications

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“…The electron-transfer number (n) of P-T/rGO was calculated from the Koutecky-Levich (K-L) equation to be 3.48 at 0.2 V (Figure 2c). This value is comparable to those of many highperformance ORR electrocatalysts [21] and even higher than those of P-Se/rGO (3.04), P-Ph/rGO (2.85), and rGO (2.65; see Figure S6). Furthermore,the superior kinetic of P-T/rGO was confirmed by the Tafel plot, where amuch smaller slope of 70.4 mV dec À1 is observed for P-T/rGO (Figure 2e:; see Figure S7).…”

Section: Angewandte Chemiesupporting

confidence: 71%

Heterocyclization Strategy for Construction of Linear Conjugated Polymers: Efficient Metal‐Free Electrocatalysts for Oxygen Reduction

Long

Wang

et al. 2019

Angewandte Chemie

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Exploring cost-effective and efficient metal-free electrocatalysts for the oxygen reduction reaction (ORR) is crucial for the development of energy conversion and storage technologies.R eported here is an ovel heterocyclization strategy to construct efficient ORR catalysts based on linear conjugated polymers (LCPs), which are composed of N-, S-, or Se-heterocycles.A mong these polymers,t he covalently linked pyridine and thiophene molecule (P-T)with reduced graphene oxide (rGO) exhibits ar emarkable half-wave potential of 0.79 V(vs.RHE) and excellent electrochemical stability,which are among the highest values for metal-free polymers as ORR catalysts.D ensity-functional theory (DFT) calculations reveal that the molecule with ap henyl unit (P-Ph)i sc atalytically inactive,and when athiophene unit is introduced to replace the phenyl unit in the conjugated backbone it features highly efficient electrocatalytic active sites.M ore importantly,t he well-defined molecular structures and controllable active sites in the pyrolysis and metal-free polymers highlight new opportunities for the catalytic metal-free ORR.

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Section: Angewandte Chemiesupporting

confidence: 71%

Heterocyclization Strategy for Construction of Linear Conjugated Polymers: Efficient Metal‐Free Electrocatalysts for Oxygen Reduction

Long

Wang

et al. 2019

Angewandte Chemie

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“…With the mounting influence of energy crisis and environmental pollution, it is urgent to design a series of new energy materials and technology which are sustainable and renewable 1–3. Exploring non‐noble metal catalysts with desired activity and stability to replace costly Pt‐based ones for the oxygen reduction reaction (ORR) has been a significant challenge,4,5 for the large‐scale commercialization of energy‐related devices, such as rechargeable metal–air batteries6–9 and fuel cells 10,11. Transition metals and their derivatives, including alloys,12,13 oxides,14–16 chalcogenides,17–20 phosphides,21–23 carbides,24–26 and nitrides27–29 have attracted researcher's widely attention because of their intrinsic electrochemical properties and low price.…”

Section: Introductionmentioning

confidence: 99%

Gadolinium‐Induced Valence Structure Engineering for Enhanced Oxygen Electrocatalysis

Wang

Yang

et al. 2020

Advanced Energy Materials

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131

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Rare earth doped materials with unique electronic ground state configurations are considered emerging alternatives to conventional Pt/C for the oxygen reduction reaction (ORR). Herein, gadolinium (Gd)‐induced valence structure engineering is, for the first, time investigated for enhanced oxygen electrocatalysis. The Gd2O3–Co heterostructure loaded on N‐doped graphene (Gd2O3–Co/NG) is constructed as the target catalyst via a facile sol–gel assisted strategy. This synthetic strategy allows Gd2O3–Co nanoparticles to distribute uniformly on an N‐graphene surface and form intimate Gd2O3/Co interface sites. Upon the introduction of Gd2O3, the ORR activity of Gd2O3–Co/NG is significantly increased compared with Co/NG, where the half‐wave potential (E1/2) of Gd2O3–Co/NG is 100 mV more positive than that of Co/NG and even close to commercial Pt/C. The density functional theory calculation and spectroscopic analysis demonstrate that, owing to intrinsic charge redistribution at the engineered interface of Gd2O3/Co, the coupled Gd2O3–Co can break the OOH*–OH* scaling relation and result in a good balance of OOH* and OH* binding on Gd2O3–Co surface. For practical application, a rechargeable Zn–air battery employing Gd2O3–Co/NG as an air–cathode achieves a large power density and excellent charge–discharge cycle stability.

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“…[24] The calculated capacitances of as-prepared samples were shown in Figure S6. For highly nanostructured electrodes, the electrochemically active surface area (ECSA) is an important indicator to the intrinsic properties of an electrode catalyst, which can be probed by measuring the electrochemical double-layer capacitance (C dl ) associated with changing from the scan-rate dependence of CV curves.…”

Section: Resultsmentioning

confidence: 99%

Metal‐Free Hybrid of Nitrogen‐Doped Nanocarbon@Carbon Networks for Highly Efficient Oxygen Reduction Electrocatalyst

Shi

Qin

et al. 2019

ChemElectroChem

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Further improving the oxygen reduction reaction (ORR) catalytic activity of carbon catalysts is highly challenging and remains a key issue to push forward their commercial progress as Pt alternatives in fuel cells and metal-air batteries. Herein, a facile and economic strategy was proposed to maximize the active sites exposed in porous carbon catalysts by growing dense Ndoped carbon nanonodules firmly located within carbon fiber networks (NCN@CF) via the in situ polymerization of dopamine on bacterial cellulose fibers and a subsequent carbonization process. This metal-free hybrid catalyst exhibits enhanced ORR activity and better stabilities against long duration and the methanol crossover effect than the commercial Pt/C catalyst in 0.1 M KOH. Notably, when the NCN@CF hybrid was used as an air electrode catalyst in a Zn-air battery, the as-fabricated battery presented a larger peak power density of 168 mW cm À 2 , higher specific capacity of 720.5 mA h g À 1 and energy density of 900.0 Wh kg À 1 compared to those based on commercial Pt/C and most N-doped carbon catalysts ever reported, evidencing its highly promising use as a Pt-alternative catalyst for the ORR.

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Generation of Nanoparticle, Atomic‐Cluster, and Single‐Atom Cobalt Catalysts from Zeolitic Imidazole Frameworks by Spatial Isolation and Their Use in Zinc–Air Batteries

Cited by 541 publications

References 41 publications

Heterocyclization Strategy for Construction of Linear Conjugated Polymers: Efficient Metal‐Free Electrocatalysts for Oxygen Reduction

Heterocyclization Strategy for Construction of Linear Conjugated Polymers: Efficient Metal‐Free Electrocatalysts for Oxygen Reduction

Gadolinium‐Induced Valence Structure Engineering for Enhanced Oxygen Electrocatalysis

Metal‐Free Hybrid of Nitrogen‐Doped Nanocarbon@Carbon Networks for Highly Efficient Oxygen Reduction Electrocatalyst

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