Fe–N-Doped Mesoporous Carbon with Dual Active Sites Loaded on Reduced Graphene Oxides for Efficient Oxygen Reduction Catalysts

Zhang, Chao; Li, Jun; Ye, Yixing; Aslam, Zabeada; Brydson, R.; Liang, Changhao

doi:10.1021/acsami.7b14443

Cited by 96 publications

(57 citation statements)

References 49 publications

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“…As presented in Figure 10A, compared with retained 85.68% for Pt/C, the value of current density for HCN-FNFCG-650 is still kept 92.83% of the initial value after 9000-second continuous tests. 4,47,55 While the small change of the HCN-FNFCG-650 has been found at the same conditions. The tolerances to methanol poisoning effect were investigated by chronoamperometric response tests with absolute methanol added; other test conditions are at the same as the stability tests.…”

Section: Resultssupporting

confidence: 55%

“…The result of methanol measurement for 20% Pt/C catalyst is also confirmed by previous related methanol tests. 4,47,55 While the small change of the HCN-FNFCG-650 has been found at the same conditions. These results indicated that the HCN-FNFCG-650 has a good immunity to methanol poisoning effect.…”

Section: Resultssupporting

confidence: 55%

“…By contrast, the HCN-FNFCG-650 with higher surface areas (S BET and S BJH are up to198.25 m 2 g −1 and 99.879 m 2 g −1 ) has larger pore volume (0.4012 cm 3 g −1 ), contrasted with samples of HCN-FNFCG-450 (92.27 m 2 g −1 , 77.532 m 2 g −1 , and 0.1782 cm 3 g −1 ) and HCN-FNFCG-850 (89.653 m 2 g −1 , 68.846 m 2 g −1 , and 0.1298 cm 3 g −1 ). 35,47,48 Notably, the peaks of pyridinic N and graphitic N, exhibit almost parallel highest in all nitrogen sources, formed the main nitrogen source. But macropores exists only in HCN-FNFCG-650.…”

Section: Resultsmentioning

confidence: 97%

“…The N1s peaks of the HCN-FNFCG-650 at 398.5, 399.7, 401.1, and 402.1 eV are pointed to pyridinic N, pyrrolic N, graphitic N, and oxidized N. 46 As for the N1s peak at 404.2 eV, it may be metallic N. In previous researches, the Fe atoms can bind with graphitic N and pyridinic N to produce the ORR active sites. 35,47,48 Notably, the peaks of pyridinic N and graphitic N, exhibit almost parallel highest in all nitrogen sources, formed the main nitrogen source. Previous researches have also shown that pyridine N and graphite N are active ORR sites in the electrochemical process.…”

Section: Resultsmentioning

confidence: 97%

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Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

et al. 2019

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Summary A new template‐free controlled method is reported herein to prepare the novel hollow carbon nanospheres with dual active sites of FeN4 and FeC3 by in situ growth reaction on graphene nanosheets, labeled as HCN‐FNFCG. As‐prepared HCN‐FNFCG nanomaterials possess hierarchically porous FeN4/FeC3 shells with structures of microporous, mesoporous, and macroporous properties. Moreover, the hierarchically porous HCN‐FNFCG nanomaterials with dual active sites of FeN4 and FeC3 have not been reported before. The HCN‐FNFCG nanomaterials, as oxygen reduction reaction (ORR) catalysts, are first studied systematically toward cathodic ORR of fuel cell. The measurements have illustrated that HCN‐FNFCG‐650 has the best ORR performances among these HCN‐FNFCG nanomaterials studied. The onset potential of HCN‐FNFCG‐650 has reached 1.095 V in alkaline electrolyte, and its maximum current density is 6.48 mA cm−2. Additionally, the HCN‐FNFCG‐650 has also displayed small electrochemical impedance, its Tafel‐slope value is 44.25 mV dec−1, much lower than that of the 20% Pt/C (69.57 mV dec−1). And its value of current density is still maintained 92.83% of the initial value after 9000‐second continuous tests. High tolerance against methanol crossover is also exhibited for HCN‐FNFCG‐650. This novel method of template‐free synthesis can provide a promising strategy for preparing hollow nanospheres with hierarchically porous shells. And it can be used to design ORR electrocatalysts, electrode materials, or other applications.

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Section: Resultssupporting

confidence: 55%

Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

See 2 more Smart Citations

Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

et al. 2019

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“…Generally, the doped N atoms can be separated into sp 2 hybridized graphitic N, pyridinic N, sp 3 hybridized pyrrolic N, and oxidized N species, among which the pyridinic N has been proved to play a vital role in the process of ORR 69,117. A three‐step carbonization process for synthesizing nitrogen‐doped porous carbon/carbon nanotubes from the MOF‐55 has been proposed, which presented excellent ORR activity in alkaline electrolyte with even more positive E onset and E 1/2 compared to the commercial Pt/C catalysts 118. The outstanding ORR performance is believed to be mainly due to the synergy of rich nitrogen doping, high graphitic degree, and large surface area.…”

Section: Orr Performance and Active Site Researchmentioning

confidence: 99%

Efficient Oxygen Reduction Catalysts of Porous Carbon Nanostructures Decorated with Transition Metal Species

Huang

Shen

Zhang

et al. 2019

Advanced Energy Materials

188

123

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Developing substitutes of noble metal catalysts toward oxygen reduction reaction (ORR) at the cathode is of vital importance for promoting low‐temperature polymer electrolyte membrane fuel cells. Transition metal species have been one of the hot areas of interest due to their low cost, high activity, and long‐term stability. The design of porous carbon nanostructures decorated with transition metal species plays a vital role in enhancing ORR catalytic performance. Here, the recent breakthroughs in porous carbon nanostructures decorated with transition metal species (including nanoparticles and atomically dispersed supported metal) are discussed. The porous nanostructures can provide large surface area as well as abundant pore channels, leading to sufficient exposure of active sites and efficient mass transfer. These nanostructures can be synthesized by several approaches, including the templated method, the self‐templated method, the impregnation process, and so on. Furthermore, the ORR performance and the exploration of active sites are also discussed for further enhancement of the ORR catalysts. Finally, the challenges and prospects are discussed, which would push forward the development of ORR catalysts in the near future.

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Non‐Noble‐Metal Catalyst and Zn/Graphene Film for Low‐Cost and Ultra‐Long‐Durability Solid‐State Zn‐Air Batteries in Harsh Electrolytes

Yang

Zheng

et al. 2022

Adv Funct Materials

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Exploration and development of cost‐effective, ultra‐long durability, and high‐performing non‐noble‐metal catalysts for the oxygen reduction reaction (ORR) to replace Pt‐based catalysts for electrochemical energy conversion devices is still of great challenge. Although several types of non‐noble‐metal catalysts (N‐doped graphene, transition metal nanoparticles, single atomic metal‐nitrogen‐carbon, etc.) are claimed to have comparable or overwhelming catalytic performances compared with commercial Pt/C, their long‐durability, especially in harsh electrolytes, are still unsatisfactory for practical applications. Herein, the classical Fe3C‐NG catalysts are synthesized and investigated to understand the catalytic and degradation behaviors in Zn‐Air batteries. Experimental analysis and theoretical calculations reveal that the Mott–Schottky heterojunction formed by Fe3C quantum dots (QDs) and N‐doped graphene carbon (Fe3C‐NG) boosts the ORR, since the Fe3C quantum dots provide rapid electron transfer to the valence band of NG. Molecular dynamic simulation suggests that the graphene structure in NG is relatively stable in extremely corrosive electrolyte, which avoids the corrosion of Fe3C quantum dots. In combination of the Zn/graphene composite film and solid‐state electrolyte, the optimized Zn‐air battery with Fe3C‐NG catalyst delivers a high open circuit voltage of 1.506 V, high energy density of 706.4 Wh kg–1, and long‐term stability for 1000 h.

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Fe–N-Doped Mesoporous Carbon with Dual Active Sites Loaded on Reduced Graphene Oxides for Efficient Oxygen Reduction Catalysts

Cited by 96 publications

References 49 publications

Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

Efficient Oxygen Reduction Catalysts of Porous Carbon Nanostructures Decorated with Transition Metal Species

Non‐Noble‐Metal Catalyst and Zn/Graphene Film for Low‐Cost and Ultra‐Long‐Durability Solid‐State Zn‐Air Batteries in Harsh Electrolytes

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