Increasing the heteroatoms doping percentages of graphene by porous engineering for enhanced electrocatalytic activities

Li, Xintong; Xu, Yongsheng; Li, Yang; Fan, Xiaobin; Zhang, Guoliang; Zhang, Fengbao

doi:10.1016/j.jcis.2020.05.089

Cited by 32 publications

(16 citation statements)

References 39 publications

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“…Further, the incorporation of heteroatoms also has a vital impact on the material property, which is reflected in the enhancement of the catalytic activity in many applications. Heteroatom doping on the catalyst surface was found to be highly effective for electrocatalytic water splitting, which is mainly due to the synergistic effect of heteroatoms like P, N, and S with exposed active surface area and accelerated charge transfer in the electrode/electrolyte interface. − Recently, our group has developed Co-ZIF microfibers via the most reliable ES method . As synthesized fibers are subjected to annealing at a unique temperature and atmospheric conditions, the resultant fibrous material has to be subjected to water oxidation at various pH conditions.…”

Section: Introductionmentioning

confidence: 99%

Electrospun Fe-Incorporated ZIF-67 Nanofibers for Effective Electrocatalytic Water Splitting

et al. 2021

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The explorations of earth-abundant, noble metal-free, highly efficient electrocatalysts for water-splitting reactions have been considered as highly significant for imperishable energy production. Though the metal organic framework (MOF)-based materials are highly promising candidates in the area of material chemistry, the combined properties associated with MOFs and the one-dimensional (1D) fibrous matrix, which can lead to better electrocatalytic performance, have been less explored. Herein, we ascertain a fabrication method for ZIF-67 (zeolite imidazolate framework) nanofibers (NFs), Fe-ZIF NFs, and Fe-ZIF-67 NFs via the wet chemical combined electrospinning (ES) approach. The as-synthesized catalysts were utilized for the electrochemical reaction, which showed a high efficiency toward the oxygen evolution reaction (OER). Compared to other catalysts, the Fe-ZIF-67 NF catalyst showed a very less overpotential of 278 mV at a fixed current density of 10 mA cm–2. The obtained Tafel slope and R ct values are 77 mV dec–1 and 1.2 Ω, respectively. The post-X-ray photoelectron spectroscopy (XPS) analysis revealed the transformation of FeOOH during the OER study along with Co3+ states in mixed Fe-ZIF-67 NFs. In an alkaline electrolyzer, Fe-ZIF-67 NFs were utilized as the anode and a Pt wire as the cathode in 1 M KOH solution, which required a cell voltage of 1.68 V at 10 mA cm–2 current density with astonishing stability. Hence, this work should open a new path for the exploration of efficient non-noble metal catalysts for energy-related applications.

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Section: Introductionmentioning

confidence: 99%

Electrospun Fe-Incorporated ZIF-67 Nanofibers for Effective Electrocatalytic Water Splitting

et al. 2021

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“…The GCD curves of the doped tobacco stalk-activated carbon sample have the same characteristics as those of the nondoped sample ( Figure 6 b), which is consistent with the rectangular shape of the CV curve. However, one can see that the discharge curves of both the nondoped and doped samples show a slight deviation from nonlinearity, and it can be clearly seen that the curves of the N, S-codoped samples are more nonlinear ( Figure S6 ) because the S doping facilitates the HER reaction [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

N, S-Codoped Activated Carbon Material with Ultra-High Surface Area for High-Performance Supercapacitors

Yuan

Chen

et al. 2020

Polymers

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The recycling of macromolecular biowastes has been a problem for the agriculture industry. In this study, a novel N, S-codoped activated carbon material with an ultrahigh specific area was produced for the application of a supercapacitor electrode, using tobacco stalk biowastes as the carbon source, KOH as the activating agents and thiourea as the doping agent. Tobacco stalk is mainly composed of cellulose, but also contains many small molecules and inorganic salts. KOH activation resulted in many mesopores, giving the tobacco stem-activated carbon a large specific surface area and double-layer capacitance. The specific surface area of the samples reached up to 3733 m2·g−1, while the maximum specific capacitance of the samples obtained was up to 281.3 F·g−1 in the 3-electrode tests (1 A·g−1). The doping of N and S elements raised the specific capacitance significantly, which could be increased to a value as high as 422.5 F·g−1 at a current density of 1 A·g−1 in the 3-electrode tests, but N, S-codoping also led to instability. The results of this article prove that tobacco stalks could be efficiently reused in the field of supercapacitors.

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“…From the point of view of the carbon component, the highest reported activities in OER are, in general, obtained for the composites with graphene or reduced graphene oxide [ 80 , 100 ], and N or S,N-co-doped graphene materials [ 96 , 150 , 151 , 152 ]. Interestingly, similarly high reactivities can be obtained with composites built with amorphous carbons without [ 147 , 153 ], or with alien atom doping [ 139 , 154 ].…”

Section: Reactivity Of Carbon-based Composite Materialsmentioning

confidence: 99%

“…The ANSG catalyst (281 mV vs. RHE) showed a considerably lower overpotential at 10 mA cm −2 in 1 M KOH than NSG (452 mV vs. RHE). Similarly, significant differences were observed for electrochemical kinetics during the OER test; the Tafel slopes for ANGS and NGS were 108.9 and 172.1 mV dec −1 , respectively [ 150 ].…”

Section: Reactivity Of Carbon-based Composite Materialsmentioning

confidence: 99%

Carbon-Based Composites as Electrocatalysts for Oxygen Evolution Reaction in Alkaline Media

et al. 2021

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This review paper presents the most recent research progress on carbon-based composite electrocatalysts for the oxygen evolution reaction (OER), which are of interest for application in low temperature water electrolyzers for hydrogen production. The reviewed materials are primarily investigated as active and stable replacements aimed at lowering the cost of the metal electrocatalysts in liquid alkaline electrolyzers as well as potential electrocatalysts for an emerging technology like alkaline exchange membrane (AEM) electrolyzers. Low temperature electrolyzer technologies are first briefly introduced and the challenges thereof are presented. The non-carbon electrocatalysts are briefly overviewed, with an emphasis on the modes of action of different active phases. The main part of the review focuses on the role of carbon–metal compound active phase interfaces with an emphasis on the synergistic and additive effects. The procedures of carbon oxidative pretreatment and an overview of metal-free carbon catalysts for OER are presented. Then, the successful synthesis protocols of composite materials are presented with a discussion on the specific catalytic activity of carbon composites with metal hydroxides/oxyhydroxides/oxides, chalcogenides, nitrides and phosphides. Finally, a summary and outlook on carbon-based composites for low temperature water electrolysis are presented.

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Increasing the heteroatoms doping percentages of graphene by porous engineering for enhanced electrocatalytic activities

Cited by 32 publications

References 39 publications

Electrospun Fe-Incorporated ZIF-67 Nanofibers for Effective Electrocatalytic Water Splitting

Electrospun Fe-Incorporated ZIF-67 Nanofibers for Effective Electrocatalytic Water Splitting

N, S-Codoped Activated Carbon Material with Ultra-High Surface Area for High-Performance Supercapacitors

Carbon-Based Composites as Electrocatalysts for Oxygen Evolution Reaction in Alkaline Media

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