Oxidizing Vacancies in Nitrogen‐Doped Carbon Enhance Air‐Cathode Activity

Wang, Mengfan; Wang, Weipeng; Qian, Tao; Liu, Sisi; Li, Yutao; Hou, Zhufeng; Goodenough, John B.; Ajayan, Pulickel M.; Yan, Chenglin

doi:10.1002/adma.201803339

Cited by 54 publications

(50 citation statements)

References 33 publications

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“…The high‐resolution N 1s peak in Figure 3c could be fitted into four peaks centered at 398.3, 399.3, 401.1, and 403.8 eV, representing the pyridinic N (N1), pyrrolic N (N2), graphitic N (N3), and oxidized N (N0), respectively. [ 45,46 ] Among them, the pyridinic and graphitic N formed the catalytic active sites. [ 16,47 ] NPMRC‐900 showed the highest percentage of the pyridinic and graphitic N (Figure S10b, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

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A Strategy of Bifunctional Nanoscale Melamine‐Resin Sphere Template to Fabricate Porous Carbons

Chen

et al. 2021

Adv Materials Inter

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The pore structures of carbons profoundly affect their properties and functions. The hard template method has been extensively employed to fabricate porous carbons. Generally, the heteroatoms of porous carbons remarkably boost their performances, thus various of strategies have been carried out to incorporate the heteroatoms into porous carbons. The usual hard templates, such as silica nanoparticle and polystyrene sphere, only function as a pore‐forming agent. Herein, nanoscale melamine resin spheres (NMRSs) are fabricated for the first time. NMRSs can be decomposed to generate the template mesopore in situ during the pyrolysis of carbon precursors. Moreover, NMRSs also can work as a nitrogen‐dopant for porous carbons. As a demonstration, the N,P‐codoped hierarchically porous carbons are prepared using NMRSs as both pore‐forming agent and dopant, which exhibit excellent catalytic performances for the oxygen reduction reaction (ORR), close to or better than those of the best performing metal‐free doped carbon catalysts for the ORR. Therefore, this bifunctional template paves a facile pathway to fabricate porous carbons.

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Section: Resultsmentioning

confidence: 99%

“…Moreover, the H 2 O 2 yield of NPMRC‐900 was less than 10% at ≈0.4–0.9 V, indicative of high selectivity of the oxygen reduction reaction toward H 2 O. [ 46,52 ]…”

Section: Resultsmentioning

confidence: 99%

A Strategy of Bifunctional Nanoscale Melamine‐Resin Sphere Template to Fabricate Porous Carbons

Chen

et al. 2021

Adv Materials Inter

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“…As illustrated in the theoretical ORR and OER volcano plots, the N‐doped defect A7 site was identified as the most active for ORR, and the dopant‐free carbon defect A6 showed the highest OER activity (Figure e). In a recent study, the oxygen‐induced vacancies in an N‐doped nanocarbon were claimed critical for improving the ORR activity of the air electrode . Combined DFT calculations and experimental studies suggested that the oxygen‐induced vacancies can deliver better ORR activity than bare nitrogen doping in the basal plane.…”

Section: Carbon‐based Bifunctional Oxygen Catalystsmentioning

confidence: 99%

Recent Advances in Carbon‐Based Bifunctional Oxygen Catalysts for Zinc‐Air Batteries

Liu

Tong

Yan

et al. 2019

Batteries & Supercaps

125

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air batteries (ZABs) have recently received tremendous research attention due to their high theoretical energy densities. However, current ZABs suffer from poor energy efficiency and cyclability, mainly owing to the sluggish kinetics of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) on the air electrode. Therefore, rational design of efficient bifunctional oxygen electrocatalysts with high activity and stability is essential for improving battery performance. Carbon-based nanomaterials are promising candidates for bifunctional oxygen catalysis. In this review, we present the latest development of carbon-based bifunctional electrocatalysts for ZABs. Firstly, the related reaction mechanisms of bifunctional ORR/OER catalysts are introduced. Then, the recent advances in developing carbon-based bifunctional catalysts with tailored structure and promising catalytic performance are introduced following the regulation strategies, e. g., heteroatom doping, defect engineering, and/or hybridizing with other active materials. Finally, the key challenges and perspectives of advanced ZABs are provided to better shed light on future research. . This review aims to provide timely information of the carbon-based bifunctional oxygen catalysts for researchers and to shed light on the future development of high-performance catalysts and ZABs. 2 3 4 5 6 7 8

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“…), transition metals (Fe, Co, Ni, Zn, etc.) are introduced to replace Mo/C atoms in Mo x C. It can adjust the intrinsic electron configuration of molybdenum carbide and improve the conductivity (Li et al, 2019c;Wang et al, 2019c,f;Zhong et al, 2019).…”

Section: Dopingmentioning

confidence: 99%

Hierarchical Porous Molybdenum Carbide Based Nanomaterials for Electrocatalytic Hydrogen Production

et al. 2020

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The electrocatalytic hydrogen evolution reaction (HER) for the preparation of hydrogen fuel is a very promising technology to solve the shortage of hydrogen storage. However, in practical applications, HER catalysts with excellent performance and moderate price are very rare. Molybdenum carbide (Mo x C) has attracted extensive attention due to its electronic structure and natural abundance. Here, a comprehensive review of the preparation and performance control of hierarchical porous molybdenum carbide (HP-Mo x C) based catalysts is summarized. The methods for preparing hierarchical porous materials and the regulation of their HER performance are mainly described. Briefly, the HP-Mo x C based catalysts were prepared by template method, morphology-conserved transformations method, and secondary conversion method of an organic-inorganic hybrid material. The intrinsic HER kinetics are enhanced by the introduction of a carbon-based support, heteroatom doping, and the construction of a heterostructure. Finally, the future development of HP-Mo x C based catalysts is prospected in this review.

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Oxidizing Vacancies in Nitrogen‐Doped Carbon Enhance Air‐Cathode Activity

Cited by 54 publications

References 33 publications

A Strategy of Bifunctional Nanoscale Melamine‐Resin Sphere Template to Fabricate Porous Carbons

A Strategy of Bifunctional Nanoscale Melamine‐Resin Sphere Template to Fabricate Porous Carbons

Recent Advances in Carbon‐Based Bifunctional Oxygen Catalysts for Zinc‐Air Batteries

Hierarchical Porous Molybdenum Carbide Based Nanomaterials for Electrocatalytic Hydrogen Production

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