Paper‐Based N‐Doped Carbon Films for Enhanced Oxygen Evolution Electrocatalysis

Chen, Sheng; Duan, Jingjing; Ran, Jingrun; Qiao, Shi Zhang

doi:10.1002/advs.201400015

Cited by 72 publications

(78 citation statements)

References 36 publications

(77 reference statements)

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“…Thus, it is also not surprising to observe that CoZn-NC-T (T = 700, 800, and 900) affords the superior OER activity to that of the Co-NC-T counterpart prepared at the same pyrolysis temperature ( Table 1 vs Table S4 (Supporting Information) and Table 2 vs Table S6 (Supporting Information)). In addition to the active species that is related to Co, actually, as shown in many recent reports, the "metal-free" doped N in carbons still has the positive contributions to the OER processes, [44,46,60] primarily attributed to the altered spin density and charge density of the N-doped carbon matrices. In addition to the active species that is related to Co, actually, as shown in many recent reports, the "metal-free" doped N in carbons still has the positive contributions to the OER processes, [44,46,60] primarily attributed to the altered spin density and charge density of the N-doped carbon matrices.…”

Section: Further Discussion On Electrocatalytic Activity and Vital Romentioning

confidence: 91%

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MO‐Co@N‐Doped Carbon (M = Zn or Co): Vital Roles of Inactive Zn and Highly Efficient Activity toward Oxygen Reduction/Evolution Reactions for Rechargeable Zn–Air Battery

Yin

Wang

et al. 2017

Adv Funct Materials

236

140

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A highly efficient bifunctional oxygen catalyst is required for practical applications of fuel cells and metal-air batteries, as oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are their core electrode reactions. Here, the MO-Co@N-doped carbon (NC, M = Zn or Co) is developed as a highly active ORR/OER bifunctional catalyst via pyrolysis of a bimetal metal-organic framework containing Zn and Co, i.e., precursor (CoZn). The vital roles of inactive Zn in developing highly active bifunctional oxygen catalysts are unraveled. When the precursors include Zn, the surface contents of pyridinic N for ORR and the surface contents of Co-N x and Co 3+ /Co 2+ ratios for OER are enhanced, while the high specific surface areas, high porosity, and high electrochemical active surface areas are also achieved. Furthermore, the synergistic effects between Zn-based and Co-based species can promote the well growth of multiwalled carbon nanotubes (MWCNTs) at high pyrolysis temperatures (≥700 °C), which is favorable for charge transfer. The optimized CoZn-NC-700 shows the highly bifunctional ORR/OER activity and the excellent durability during the ORR/OER processes, even better than 20 wt% Pt/C (for ORR) and IrO 2 (for OER). CoZn-NC-700 also exhibits the prominent Znair battery performance and even outperforms the mixture of 20 wt% Pt/C and IrO 2 .

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Section: Further Discussion On Electrocatalytic Activity and Vital Romentioning

confidence: 91%

“…Typically, a series of CV curves were measured at various scan rates (10,20,30,40,50,60, and 70 mV s −1 ) within a potential range of 0.91-0.96 V versus RHE. Typically, a series of CV curves were measured at various scan rates (10,20,30,40,50,60, and 70 mV s −1 ) within a potential range of 0.91-0.96 V versus RHE.…”

Section: Methodsmentioning

confidence: 99%

MO‐Co@N‐Doped Carbon (M = Zn or Co): Vital Roles of Inactive Zn and Highly Efficient Activity toward Oxygen Reduction/Evolution Reactions for Rechargeable Zn–Air Battery

Yin

Wang

et al. 2017

Adv Funct Materials

236

140

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“…The overpotential of NSGF electrode for OER was measured to be 0.380 V at the current density of 10 mA cm −2 . This value is lower than that of OGF electrode (0.410 V), and also much lower than those of carbon fi lms reported previously, such as N, O-dual doped graphene-CNT hydrogel fi lm (NG/CNT, ≈0.484 V), [ 21 ] oxidized carbon cloth (OCC-8, 0.477 V), [ 22 ] 3D hybrid fi lm of porous N-doped graphene-NiCo 2 O 4 (PNG-NiCo,0.432 V), [ 24 ] and 3D N-doped carbon fi lm assembled by graphene and graphitic carbon nitride (G-C 3 N 4 , 0.415 V) [ 25 ] (Figure 3 F and Table S4, Supporting Information). The electrocatalytic activity of NSGF electrode is also superior to those of previously reported metal-free catalysts, including mildly oxidized multiwalled CNTs that activated by hydrothermal and electrochemical treatments (echoMWCNTs, 0.450 V), [ 17 ] N-doped graphene/single-walled CNT hybrid (NGSH, 0.400 V), [ 50 ] graphitic carbon nitride/graphene composites (g-C 3 N 4 /graphene, 0.539 V), [ 51 ] thermally reduced graphene oxide/N-doped CNTs (TRGO/NCNT, 0.505 V), [ 52 ] 3D Ni foam/porous carbon/anodized Ni electrode (3D-NF/PC/ AN, 0.520 V), [ 23 ] N-doped coaxial carbon nanocables (CNT@ NCNT, 0.527 V), [ 53 ] and even comparable to those of N-doped carbon material (N/C, 0.380 V) [ 20 ] and g-C 3 N 4 nanosheets-CNTs composite (g-C 3 N 4 NS-CNT, 0.370 V) [ 54 ] (Table S4 wileyonlinelibrary.com is a pure carbonaceous catalyst containing only C, N, O, and S nonmetallic elements, without blending other catalysts such as widely used g-C 3 N 4 , or metal species.…”

Section: The Electrocatalytic Performances For Oermentioning

confidence: 99%

“…[ 21 ] The OER electrocatalysts with carbon hydrogel fi lms were mainly explored by Qiao's group. [ 21,[24][25][26] These 3D self-supported frameworks avoid using current collectors and polymeric binders (e.g., nafi on or polytetrafl uoroethylene), and the catalysts exhibited excellent activities. However, the hydrogel fi lms were prepared from chemical converted graphene (CCG) sheets by fi ltration.…”

mentioning

confidence: 99%

Nitrogen and Sulfur Codoped Graphite Foam as a Self‐Supported Metal‐Free Electrocatalytic Electrode for Water Oxidation

Zhang

et al. 2015

Advanced Energy Materials

162

111

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positively charged. They can adsorb OH − ions with charge transfer to decrease the activation energy of OER, and support the recombination of OER intermediates (e.g., O 2− and O 2 2− ) to form oxygen gas during OER process. [ 17,21,22 ] Furthermore, the nitrogen species (e.g., pyridinic N atoms) can also participate in the electrocatalytic reaction. [ 20 ] Consequently, the carbon materials doped with N atoms or containing oxygenated groups can remarkably accelerate OER process, and they are expected to be effective substitutions of metal catalysts.Conversely, the reported OER electrocatalysts usually were powders; thus they have to be anchored onto glassy carbon electrodes or other conductive planar electrodes (e.g., carbon cloth) with polymeric binders for practical applications. Unfortunately, in these cases, the surfaces of electrocatalysts were partly inaccessible to reactants, and the 2D substrates are not suitable for desorption of O 2 bubbles, weakening the activity and restricting the recovery of active sites of OER catalysts. To overcome these problems, 3D structured electrodes with nickel foams or porous carbon hydrogel fi lms have been developed to immobilize catalysts. [ 21,[23][24][25][26] The high macroporosity of nickel foam can greatly increase the accessible specifi c surface areas of loaded catalysts, and facilitate the removal of gases. [ 23 ] However, the intrinsic instability of nickel decreased the long-term durability of these catalysts. Furthermore, the weak contacts between catalysts and nickel substrate frequently led to the releasing of catalysts during oxygen generation reaction. [ 21 ] The OER electrocatalysts with carbon hydrogel fi lms were mainly explored by Qiao's group. [ 21,[24][25][26] These 3D self-supported frameworks avoid using current collectors and polymeric binders (e.g., nafi on or polytetrafl uoroethylene), and the catalysts exhibited excellent activities. However, the hydrogel fi lms were prepared from chemical converted graphene (CCG) sheets by fi ltration. The preparation of CCG sheets usually involves a multistep complicated process, and using large amounts of acids, oxidants, and reducing agents. Moreover, the as-obtained CCG fi lms (without adding conductive additives or annealing treatment) have relatively low conductivities and brittle mechanical properties, possibly resulting in high overpotential and poor long-term stability.Commercial graphite foils (GFLs) are usually made of exfoliated graphite fl akes. They are cheap, available in large areas, fl exible, highly conductive, and thermally stable. Furthermore, they compose of nearly only carbon atoms without anyThe oxidation of water to produce oxygen gas is related to a variety of energy storage systems. Thus, the development of effi cient, cheap, durable, and scalable electrocatalysts for oxygen evolution reaction (OER) is of great importance. Here, a high-performance OER catalyst, nitrogen and sulfur codoped graphite foam (NSGF) is reported. This NSGF is prepared from commercial graphite foil and directly...

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“…[92] Shalom et al demonstrierten eine generische Methode für die Herstellung von geordnetem g-C 3 N 4 auf verschiedenen Elektroden durch Pulverbeschichtung mit dem Molekülkomplex Cyanursäure/Melamin. [92] Shalom et al demonstrierten eine generische Methode für die Herstellung von geordnetem g-C 3 N 4 auf verschiedenen Elektroden durch Pulverbeschichtung mit dem Molekülkomplex Cyanursäure/Melamin.…”

Section: Effekte Der Elektrodenarchitekturunclassified

Kohlenstoffbasierte Metallfreie Katalysatoren für die Elektrokatalyse jenseits der ORR

Dai

2016

Angewandte Chemie

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Abgesehen von ihrem Einsatz bei der Sauerstoffreduktionsreaktion (ORR) in Brennstoffzellen sind metallfreie Katalysatoren auf Kohlenstoffbasis auch als Ersatz für Edelmetall‐ oder Metalloxid‐Katalysatoren bei der Sauerstoffentwicklungsreaktion (OER) in Metall‐Luft‐Batterien sowie der Wasserstoffentwicklungsreaktion (HER) der Wasserspaltung von Interesse. Dieser Aufsatz beschäftigt sich mit neuen Entwicklungen bei metallfreien Katalysatoren auf Kohlenstoffbasis für die OER und die HER und benennt Probleme und Perspektiven auf dem relativ jungen Forschungsgebiet der metallfreien Elektrokatalyse.

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Paper‐Based N‐Doped Carbon Films for Enhanced Oxygen Evolution Electrocatalysis

Cited by 72 publications

References 36 publications

MO‐Co@N‐Doped Carbon (M = Zn or Co): Vital Roles of Inactive Zn and Highly Efficient Activity toward Oxygen Reduction/Evolution Reactions for Rechargeable Zn–Air Battery

MO‐Co@N‐Doped Carbon (M = Zn or Co): Vital Roles of Inactive Zn and Highly Efficient Activity toward Oxygen Reduction/Evolution Reactions for Rechargeable Zn–Air Battery

Nitrogen and Sulfur Codoped Graphite Foam as a Self‐Supported Metal‐Free Electrocatalytic Electrode for Water Oxidation

Kohlenstoffbasierte Metallfreie Katalysatoren für die Elektrokatalyse jenseits der ORR

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