Identifying the key N species for electrocatalytic oxygen reduction reaction on N-doped graphene

Peng, Yiyin; Bian, Zhaoyong; Zhang, Wenhai; Wang, Hui

doi:10.1007/s12274-023-5421-0

Cited by 45 publications

(16 citation statements)

References 52 publications

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“…Generally, the ORR activity of a catalyst depends on the nitrogen functionality, 45 where the types of nitrogen bonding contribute to the ORR. Pyridinic‐N provides active sites for the ORR by coordinating with atomic Fe to generate FeN x coordination, while graphitic‐N is beneficial because it improves the kinetic current, and pyrrolic‐N is advantageous for reducing the O 2 to H 2 O 2 via the 2e − ORR pathway 60–62 . As indicated by the fitted peak of N 1s of Fe–N–C_HS, dominant graphitic‐N was present (54.38 at.%), followed by pyrrolic‐N (33.04 at.%), Fe–N x (8.98 at.%), and pyridinic‐N (3.60 at.%).…”

Section: Resultsmentioning

confidence: 99%

“…Pyridinic-N provides active sites for the ORR by coordinating with atomic Fe to generate FeN x coordination, while graphitic-N is beneficial because it improves the kinetic current, and pyrrolic-N is advantageous for reducing the O 2 to H 2 O 2 via the 2e À ORR pathway. [60][61][62] As indicated by the fitted peak of N 1s of Fe-N-C_HS, dominant graphitic-N was present (54.38 at.%), followed by pyrrolic-N (33.04 at.%), Fe-N x (8.98 at.%), and pyridinic-N (3.60 at.%). The Fe-N-C_B has high number of graphitic-N, followed by pyridinic-N, Fe-N x , and pyrrolic-N, with the atomic percentage of 53.31, 22.46, 20.25, and 3.98 at.%, respectively.…”

Section: Analysis Of Structure and Morphologymentioning

confidence: 94%

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Influence of Fe–N–C morphologies on the oxygen reduction reaction in acidic and alkaline media

Junaidi

Tan

Wong

et al. 2023

Asia-Pacific J Chem Eng

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The development of nonnoble metal oxygen reduction reaction (ORR) catalysts for fuel cells has been motivated by the high cost and limited supply of noble metals, as well as the desire to improve the performance and durability of this type of energy conversion device. In this study, nonnoble Fe–N–C catalyst was synthesized using a zeolitic imidazole framework (ZIF‐8), poly (aniline), and 10,10′‐dibromo‐9,9′‐bianthry as precursors to produce Fe–N–C with hollow sphere (HS), amorphous bulky structure (B), and sheet‐like thin sheet (N) structure. The Fe–N–C catalyst was analysed in terms of their shape, crystal structure, pore characteristics, and elemental composition. Among all the Fe–N–C catalysts, Fe–N–C_HS had the highest total surface area, followed by Fe–N–C_B and Fe–N–C_N. To evaluate their ORR catalytic activity, a half‐cell electrochemical experiment with .1 M KOH and .1 M HClO4 as the alkaline and acidic electrolytes was conducted. This study revealed that Fe–N–C_HS exhibited the highest onset potential but the Fe–N–C_B has the highest limiting current density in alkaline medium; meanwhile, in acidic media, Fe–N–C_HS shows the best ORR performance with the highest onset potential and limiting current. This highly porous Fe–N–C_HS catalyst also demonstrated active site activation and excellent stability compared with the other samples as well as commercial Pt/C in acidic electrolyte, which suggests its potential for application in proton exchange membrane fuel cells (PEMFCs).

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Section: Resultsmentioning

confidence: 99%

Section: Analysis Of Structure and Morphologymentioning

confidence: 94%

Influence of Fe–N–C morphologies on the oxygen reduction reaction in acidic and alkaline media

Junaidi

Tan

Wong

et al. 2023

Asia-Pacific J Chem Eng

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“…Various metal ions that may form complexes with cyanide in the six units (the raw wastewater, the regulation unit, the O1, the H1, the O2, and the total effluent) were tested and analyzed by using an ICP-OES (Thermo ICAP7000) (with a detection limit of 0.03 mg/L) . Moreover, analysis of the water chemical balance process and density functional theory (DFT) calculation are exhibited in Text S3 and Text S4, − respectively, according to the as-published methods.…”

Section: Materials and Methodsmentioning

confidence: 99%

Function and Direction of Cyanide in Coking Wastewater: From Water Treatment to Environmental Migration

Chen,

Guan,

Pang

et al. 2023

ACS EST Water

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The secondary effluent of coking wastewater treatment plants often contains a low content but tenacious cyanides. In this study, a full-scale double physicochemical synergistic OHHO process was used to investigate the distribution of various cyanides in each unit. The cyanides tend to dissolve and be released under aerobic conditions and precipitated or be adsorbed under anaerobic/hydrolytic conditions. The toxicity and biochemical stability of cyanide conjugates bring about functional control of ammonification−nitritation−nitrification as total cyanides (TCNs) increase under polymetallic restriction. Polymetallic competitive inhibition and π bond activation between coexisting ligands (OH − , Cl − , NH 3 , and anionic dissolved organic matter (DOM)) and metal ions allowed us to maintain the balance between ionization and complexation of CN − . This paper explored the biological function and migration behavior of cyanide as an indicator in wastewater and water environments and proposed a feasible cyanide removal strategy via polymetallic competition. The synergy between competitive inhibition and activation owing to the coexistence of diverse ligands may benefit the stable occurrence of cyanides in the natural water environment, which is crucial for understanding the geochemical balance and cycle of characteristic pollutants.

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“…They induced differences in the electronic structures of carbon for N-doped carbon materials, affecting the catalytic effects for the ORR. 41,42 Pyrrolic N species were critical to the synthesis of H 2 O 2 by hindering the breakage of O-O bonds. It was demonstrated that the limiting current density and onset potential were related to graphitic N and pyridinic N, respectively.…”

Section: Structural Informationmentioning

confidence: 99%

Bimetallic CoSn nanoparticles anchored on N-doped carbon as antibacterial oxygen reduction catalysts for microbial fuel cells

Li,

Liu,

Jiang

et al. 2023

Nanoscale

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Identifying the key N species for electrocatalytic oxygen reduction reaction on N-doped graphene

Cited by 45 publications

References 52 publications

Influence of Fe–N–C morphologies on the oxygen reduction reaction in acidic and alkaline media

Influence of Fe–N–C morphologies on the oxygen reduction reaction in acidic and alkaline media

Function and Direction of Cyanide in Coking Wastewater: From Water Treatment to Environmental Migration

Bimetallic CoSn nanoparticles anchored on N-doped carbon as antibacterial oxygen reduction catalysts for microbial fuel cells

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