Effect of the N content of Fe/N/graphene catalysts for the oxygen reduction reaction in alkaline media

It is still a grand challenge to develop a highly efficient nonprecious-metal electrocatalyst to replace the Pt-based catalysts for oxygen reduction reaction (ORR). Here, we propose a surfactant-assisted method to synthesize single-atom iron catalysts (SA-Fe/NG). The half-wave potential of SA-Fe/NG is only 30 mV less than 20% Pt/C in acidic medium, while it is 30 mV superior to 20% Pt/C in alkaline medium. Moreover, SA-Fe/NG shows extremely high stability with only 12 mV and 15 mV negative shifts after 5,000 cycles in acidic and alkaline media, respectively. Impressively, the SA-Fe/NG-based acidic proton exchange membrane fuel cell (PEMFC) exhibits a high power density of 823 mW cm−2. Combining experimental results and density-functional theory (DFT) calculations, we further reveal that the origin of high-ORR activity of SA-Fe/NG is from the Fe-pyrrolic-N species, because such molecular incorporation is the key, leading to the active site increase in an order of magnitude which successfully clarifies the bottleneck puzzle of why a small amount of iron in the SA-Fe catalysts can exhibit extremely superior ORR activity.

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Engineering a metal–organic framework derived Mn–N4–CxSy atomic interface for highly efficient oxygen reduction reaction

Chemical Science ◽

10.1039/d0sc02343d ◽

2020 ◽

Vol 11 (23) ◽

pp. 5994-5999 ◽

Cited By ~ 8

Author(s):

Huishan Shang ◽

Zhuoli Jiang ◽

Danni Zhou ◽

Jiajing Pei ◽

Yu Wang ◽

...

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Metal Organic Framework ◽

Reduction Reaction ◽

Alkaline Media ◽

Single Atom ◽

Highly Efficient ◽

Metal Organic ◽

Orr Activity ◽

Atomic Interface

A sulfur modified Mn–N–C single atom catalyst was constructed through an atomic interface strategy, with outstanding ORR activity in alkaline media.

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Nitrogen- and sulfur-doped carbon nanoplatelets via thermal annealing of alkaline lignin with urea as efficient electrocatalysts for oxygen reduction reaction

RSC Advances ◽

10.1039/c6ra21958f ◽

2016 ◽

Vol 6 (106) ◽

pp. 104183-104192 ◽

Cited By ~ 14

Author(s):

Xianlei Zhang ◽

Dingling Yu ◽

Yaqing Zhang ◽

Wenhui Guo ◽

Xiuxiu Ma ◽

...

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Thermal Annealing ◽

Reduction Reaction ◽

Operational Stability ◽

Alkaline Media ◽

Pyrolysis Method ◽

One Step ◽

Orr Activity

Novel N–S–C hybrids were synthesized by a facile one-step pyrolysis method, in which the obtained N–S–C 900 was a robust catalyst with enhanced ORR activity and excellent operational stability in alkaline media, superior to the Pt/C catalyst.

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Highly active and stable AuNi dendrites as an electrocatalyst for the oxygen reduction reaction in alkaline media

Journal of Materials Chemistry A ◽

10.1039/c6ta07519c ◽

2016 ◽

Vol 4 (45) ◽

pp. 17828-17837 ◽

Cited By ~ 24

Author(s):

Jiali Wang ◽

Fuyi Chen ◽

Yachao Jin ◽

Roy L. Johnston

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Reduction Reaction ◽

Alkaline Media ◽

Term Stability ◽

Long Term Stability ◽

Highly Active ◽

Orr Activity

AuNi hierarchical dendrites were fabricated by a facile electrodeposition and dealloying method with exceptional ORR activity and remarkable long-term stability.

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Insights on platinum-carbon catalyst degradation mechanism for oxygen reduction reaction in acidic and alkaline media

Journal of Power Sources ◽

10.1016/j.jpowsour.2020.229356 ◽

2021 ◽

Vol 487 ◽

pp. 229356

Author(s):

Marc Francis Labata ◽

Guangfu Li ◽

Joey Ocon ◽

Po-Ya Abel Chuang

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Degradation Mechanism ◽

Reduction Reaction ◽

Alkaline Media ◽

Carbon Catalyst ◽

Acidic And Alkaline Media

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Superior FexN electrocatalyst derived from 1,1′-diacetylferrocene for oxygen reduction reaction in alkaline and acidic media

Nanotechnology Reviews ◽

10.1515/ntrev-2020-0057 ◽

2020 ◽

Vol 9 (1) ◽

pp. 843-852

Author(s):

Hunan Jiang ◽

Jinyang Li ◽

Mengni Liang ◽

Hanpeng Deng ◽

Zuowan Zhou

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Current Density ◽

Active Sites ◽

Reduction Reaction ◽

Alkaline Media ◽

Acidic Media ◽

Onset Potential ◽

Acidic And Alkaline Media ◽

The Stability

AbstractAlthough Fe–N/C catalysts have received increasing attention in recent years for oxygen reduction reaction (ORR), it is still challenging to precisely control the active sites during the preparation. Herein, we report FexN@RGO catalysts with the size of 2–6 nm derived from the pyrolysis of graphene oxide and 1,1′-diacetylferrocene as C and Fe precursors under the NH3/Ar atmosphere as N source. The 1,1′-diacetylferrocene transforms to Fe3O4 at 600°C and transforms to Fe3N and Fe2N at 700°C and 800°C, respectively. The as-prepared FexN@RGO catalysts exhibited superior electrocatalytic activities in acidic and alkaline media compared with the commercial 10% Pt/C, in terms of electrochemical surface area, onset potential, half-wave potential, number of electrons transferred, kinetic current density, and exchange current density. In addition, the stability of FGN-8 also outperformed commercial 10% Pt/C after 10000 cycles, which demonstrates the as-prepared FexN@RGO as durable and active ORR catalysts in acidic media.

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