Highly efficient and sustainable non-precious-metal Fe–N–C electrocatalysts for the oxygen reduction reaction

Sun, Meng; Davenport, Douglas M.; Liu, Huijuan; Qu, Jiuhui; Elimelech, Menachem; Li, Jinghong

doi:10.1039/c7ta09187g

Cited by 216 publications

(106 citation statements)

References 71 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: 54%

“…53 Electron transfer channel of the ORR is mainly occupied by 4e − pathway. A Tafel plot slope of the HCN-FNFCG-650 electrode reveal the value of 44.25 mV dec −1 , much lower than that of the 20% Pt/C (69.57 mV dec −1 , closed to previous literatures 4,14,15,32,54,55 . Furthermore, The Tafel curves are obtained and dynamic mechanism of the HCN-FNFCG-650 is further studied, seen to Figure 9D.…”

Section: Resultssupporting

confidence: 44%

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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: 54%

Section: Resultssupporting

confidence: 44%

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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“…The oxygen reduction reaction (ORR) is one of the key half‐reactions being applied in novel forms of energy production; however, to date, it has been shown to be a relatively inefficient energy source due to the kinetics and complex chemical pathways involved. An electrocatalyst is needed to accelerate the ORR . Pt‐based alloys are among the best options due to their extraordinary catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

In situ self‐template synthesis of cobalt/nitrogen‐doped nanocarbons with controllable shapes for oxygen reduction reaction and supercapacitors

Liu

Jiang

et al. 2019

Int J Energy Res

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Summary Shape‐controlled Co/N‐doped nanocarbons derived from polyacrylonitrile (PAN) were synthesized by a one‐step in situ self‐template method followed by a pyrolysis procedure. This is the first study to tune the nanostructure of Co/N‐doped carbon materials by providing a metal salt as the template and additive. The moderate surface area (699.47 m2 g−1), highly developed pore structure, homogenous Co and N doping and designed “egg‐box” structure impart Co/N‐doped cross‐linked porous carbon (Co/N‐CLPC) with excellent electrocatalytic activity and capacitive performance. This material displayed an onset potential of 0.805 V (vs RHE), a current density of −5.102 mA cm−2, excellent long‐term durability, and good resistance to methanol crossover, which are comparable with the characteristics of a commercial 20‐wt% Pt/C catalyst. In addition, Co/N‐CLPC demonstrated a high specific capacitance of 313 F g−1 at 0.5 A g−1, notable rate performance of 63% at 50 A g−1, and good cycling stability of 104.8% retention after 5000 cycles when used as a supercapacitor electrode. This method enables new routes to obtaining Co/N‐doped nanocarbons with shape‐controlled structures for energy conversion and storage applications.

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“…It should be noted that the microstructures of these N‐MC (especially the introduction of N element) depended on the structures of N‐containing groups in EDTA, dicyandiamide and melamine. The (carboxymethyl)amino group in EDTA results in its good cheating ability to metal ions, which is difficult to be introduced into the matrix of carbon framework . By contrast, the cyano groups in melamine ensures that melamine has been proven as an effective precursor for preparation of N‐doped carbon materials …”

Section: Resultsmentioning

confidence: 99%

Highly Sensitive and Selective Dopamine Detection Utilizing Nitrogen‐Doped Mesoporous Carbon Prepared by a Molten Glucose‐Assisted Hard‐Template Approach

et al. 2019

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Nitrogen‐doped mesoporous carbons (N‐MCs) are promising materials for electrochemical sensors or biosensors. However, facile and effective methods for the preparation of N‐MCs for electrochemical detection of dopamine (DA) are required. A molten‐glucose‐assisted hard‐template approach has been developed to synthesize N‐MC materials by in situ introduction of nitrogen precursors, including ethylenediaminetetraacetic acid disodium salt (EDTA), dicyandiamide, and melamine. The combined characterization of X‐ray diffraction (XRD), N2 sorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X‐ray photoelectron spectroscopy (XPS) indicate the successful preparation of N‐MC materials. Most importantly, after detailed examination by cyclic voltammetry (CV) and differential pulse voltammetry (DPV), N‐MC obtained by using melamine as precursor (designated as N‐MC‐MA) displays good catalytic activity for electrochemical oxidation of DA. The N‐MC‐MA‐based DA sensor shows a linear range from 0.2–8 μm with a detection limit of 0.05 μm in the presence of ascorbic acid (AA) and uric acid (UA), thus showing excellent sensitivity and selectivity for electrochemical DA detection.

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Highly efficient and sustainable non-precious-metal Fe–N–C electrocatalysts for the oxygen reduction reaction

Abstract: Efficient and sustainable Fe–N–C catalyst prepared by EDTA–Fe(ii) pyrolysis promotes the ORR performances within a nearly four-electron transfer pathway.

Cited by 216 publications

References 71 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

In situ self‐template synthesis of cobalt/nitrogen‐doped nanocarbons with controllable shapes for oxygen reduction reaction and supercapacitors

Highly Sensitive and Selective Dopamine Detection Utilizing Nitrogen‐Doped Mesoporous Carbon Prepared by a Molten Glucose‐Assisted Hard‐Template Approach

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