On the role of hydroxide species in sulphur- and nitrogen-doped cobalt-based carbon catalysts for the oxygen evolution reaction

Shahraei, Ali; Kuebler, Markus; Martinaiou, Ioanna; Creutz, K. Alexander; Wallace, W. D.; Nowroozi, Mohammad Ali; Paul, Stephen; Weidler, Natascha; Stark, Robert W.; Clemens, Oliver; Kramm, Ulrike I.

doi:10.1039/c8ta05769a

Cited by 15 publications

(15 citation statements)

References 64 publications

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“…M-N-C materials are also known as effective catalysts for the HER. [220][221][222] Co and nitrogen codoped graphene-based catalysts (CoN x -N/O-Gra, x = 1-4) have been demonstrated to be the highly efficient catalysts for HER. From the volcano curve (exchange current versus adsorption free energy), optimal performance could be achieved on CoN 4 -Gra, attributable to the moderate adsorption strength of CoN 4 -Gra toward H atoms.…”

Section: Hydrogen Evolution Reactionmentioning

confidence: 99%

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

et al. 2021

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Metal-nitrogen-carbon (M-N-C) material with specifically coordinated configurations is a promising alternative to costly Pt-based catalysts. In the past few years, great progress is made in the studies of M-N-C materials, including the structure modulation and local coordination environment identification via advanced synthetic strategies and characterization techniques, which boost the electrocatalytic performances and deepen the understanding of the underlying fundamentals. In this review, the most recent advances of M-N-C catalysts with specifically coordinated configurations of M-N x (x = 1-6) are summarized as comprehensively as possible, with an emphasis on the synthetic strategy, characterization techniques, and applications in typical electrocatalytic reactions of the oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, CO 2 reduction reaction, etc., along with mechanistic exploration by experiments and theoretical calculations. Furthermore, the challenges and potential perspectives for the future development of M-N-C catalysts are discussed.

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Section: Hydrogen Evolution Reactionmentioning

confidence: 99%

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

et al. 2021

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“…Similar observations were made before for cobalt-or iron-based MNC catalysts. [14a,38] Instead, it is expected that the increasing size of crystalline cobalt domains leads to higher amounts of OER active [39] cobalt oxides and/or hydroxides, when exposed to air as well as under OER conditions. In addition to crystalline cobalt, additional phases might form, like Co-rich nitride-like Co x N y species, which might also undergo surface oxidation when exposed to air.…”

Section: Resultsmentioning

confidence: 99%

Application of Non‐Precious Bifunctional Catalysts for Metal‐Air Batteries

et al. 2021

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Zinc‐air batteries have several advantages in comparison with the lithium‐ion technology as they enable the use of earth‐abundant elements, work at low cost, are lightweight, and are also much safer in application. In addition to the chemistry related to the zinc electrode, efficient and stable bifunctional catalysts are required for oxygen reduction reaction (ORR, for discharging) and oxygen evolution reaction (OER, for charging) on the air‐electrode side. Herein, a family of non‐precious metal catalysts is investigated as possible bifunctional composite: metal–nitrogen–carbon (MNC) catalysts for ORR, and metal oxyhydroxides as OER catalysts (Ox). The effect of transition metal and metal loading in these composite MNC + Ox catalysts on ORR and OER activities in half‐cell measurements is discussed. The catalysts were characterized using X‐ray diffraction and Raman spectroscopy to identify their phase composition. For the most active material, a potential gap of 0.79 V between OER and ORR was obtained, respectively. In a zinc‐air cell, this catalyst moreover showed a peak power density of 62 mW cm−2 and a charge–discharge gap of 0.94 V after 26 h of charge–discharge cycling.

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“…42 Figure 8b displays the N 1s spectrum, where bands at 398.7, 399.4, 400.5, and 401.5 eV are attributed to pyridinic N, Co–N, pyrrolic N, and graphitic N, respectively. 43 Note that the N/C atomic ratio in ZIF-67 is 1/2 based on the 2-methylimidazole (C 4 H 6 N 2 ) ligand composition. This ratio drops to ∼1/8 after pyrolysis at 500 °C (from EDS analysis), suggesting that a majority of imidazole rings are damaged during pyrolysis to release N. The detection of graphitic N and N bonded to Co demonstrates that some of the released N becomes dopant of the Co and graphite phases.…”

Section: Resultsmentioning

confidence: 99%

Ambient Temperature NO Adsorber Derived from Pyrolysis of Co-MOF(ZIF-67)

et al. 2019

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Co-, Ni-, and Zn-containing MOFs are prepared and then pyrolyzed to generate materials for ambient temperature NO adsorption. Materials containing Co are much more efficient for NO adsorption than those containing Ni and Zn; therefore, Co is identified as the active phase. The best performing material studied here achieves 100% low concentration (10 ppm) NO adsorption for more than 15 h under a weight hourly space velocity of 120 000 mL g –1 h –1 . Powder X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared, and Raman spectroscopies, along with scanning electron microscopy and TEM, are used to probe the physicochemical properties of the materials, particularly the Co active phase, and chemistries involved in NO adsorption–desorption. NO adsorbs on oxygen-covered Co nanoparticle surfaces in the form of nitrates and desorbs as NO at higher temperatures as a result of surface nitrate decomposition. NO storage capacity decreases gradually upon repeated NO adsorption–desorption cycles, likely because of Co 3 O 4 formation during these processes.

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On the role of hydroxide species in sulphur- and nitrogen-doped cobalt-based carbon catalysts for the oxygen evolution reaction

Abstract: Cobalt hydroxide species are at the origin of OER activity of multiheteroatom doped carbon catalysts.

Cited by 15 publications

References 64 publications

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

Application of Non‐Precious Bifunctional Catalysts for Metal‐Air Batteries

Ambient Temperature NO Adsorber Derived from Pyrolysis of Co-MOF(ZIF-67)

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