The Role of Nitrogen and Sulfur Dual Coordination of Cobalt in Co-N4−xSx/C Single-Atom Catalysts in Oxygen Reduction Reaction

2021 ◽  
Author(s):  
Asnake Sahele Haile ◽  
Heine Anton Hansen ◽  
Weldegebriel Yohannes ◽  
Yedilfana Setarge Mekonnen
Keyword(s):  
Fuel Cell ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Single Atom ◽  
Potential Candidate ◽  
Fuel Cell Application ◽  
Orr Activity

Single-atom catalysts (SACs) have been considered as a potential candidate for fuel cell application due to the fact that they exhibited good oxygen reduction reaction (ORR) activity. In this study,...

Cu single atoms on Ti2CO2 as a highly efficient oxygen reduction catalyst in a proton exchange membrane fuel cell

2019 ◽  
Vol 7 (45) ◽  
pp. 26062-26070 ◽  
Author(s):  
Qiong Peng ◽  
Jian Zhou ◽  
Jiatian Chen ◽  
Tian Zhang ◽  
Zhimei Sun
Keyword(s):  
Fuel Cell ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Proton Exchange Membrane ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Single Atom ◽  
Single Atoms ◽  
Oxygen Reduction Catalyst ◽  
Exchange Membrane

MXene supported single-atom catalysts catalyze the oxygen reduction reaction in a proton exchange membrane fuel cell.

scholarly journals Unveiling the high-activity origin of single-atom iron catalysts for oxygen reduction reaction

2018 ◽  
Vol 115 (26) ◽  
pp. 6626-6631 ◽  
Author(s):  
Liu Yang ◽  
Daojian Cheng ◽  
Haoxiang Xu ◽  
Xiaofei Zeng ◽  
Xin Wan ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Density Functional ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Alkaline Media ◽  
Single Atom ◽  
Iron Catalysts ◽  
Grand Challenge ◽  
Orr Activity

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.

Single-Atom Oxygen Reduction Reaction Electrocatalysts of Fe, Si, and N co-doped Carbon with 3D Interconnected Mesoporosity

2021 ◽  
Author(s):  
Hee Soo Kim ◽  
CHI HO LEE ◽  
Jue-Hyukk Jang ◽  
Min Seok Kang ◽  
Haneul Jin ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Performance ◽  
Reduction Reaction ◽  
Anion Exchange Membrane ◽  
Single Atom ◽  
Air Battery ◽  
Orr Activity ◽  
Exchange Membrane ◽  
Co Doped

Development of non Pt-based catalysts (non-PBCs) that show excellent oxygen reduction reaction (ORR) activity for high-performance Zn-air battery (ZAB) and anion exchange membrane fuel cell (AEMFC) is highly necessitated. Here,...

scholarly journals Conducting Copper(I/II)-Metallopolymer for the Electrocatalytic Oxygen Reduction Reaction (ORR) with High Kinetic Current Density

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1002 ◽  
Author(s):  
Sait Elmas ◽  
Wesley Beelders ◽  
Xun Pan ◽  
Thomas Nann
Keyword(s):  
Fuel Cell ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Noble Metals ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
Potential Candidate ◽  
Hydrogen Electrode ◽  
Electrocatalytic Oxygen Reduction ◽  
Current Densities

The oxygen reduction reaction (ORR) is still the most research-intensive aspect of a fuel cell. The sluggish kinetics of the electrocatalysts toward the ORR requires large amounts of platinum to be used as cathode material, which calls for alternatives to replace or minimize the amount of the noble metals used. This study describes the synthesis and complete characterization of a copper metallopolymer (Cu MP) based on a conducting polymer (CP) and single-site catalytic centers for the electrocatalytic ORR. The copper (II) catalyst, embedded in a redox-active and conducting polymeric environment, was pursued as a potential candidate to replace noble metals in fuel cell applications. Performance studies at a rotating disk electrode (RDE) showed that the metallopolymer exhibited a direct four-electron reduction at potentials between −150 and −350 mV vs. the reversible hydrogen electrode (RHE) and high kinetic current densities of over 22.62 mA/cm2. The kinetic current densities obtained at the Cu MP electrode outperformed most of the reported state-of-the art electrocatalysts toward the ORR. Further analysis of the Cu/CP hybrid revealed the copper being largely reduced to the oxidation state +I.

Nano-geometric deformation and synergistic Co nanoparticles—Co-N4 composite sites for proton exchange membrane fuel cells

2021 ◽  
Author(s):  
Xiaoyang Cheng ◽  
Jian Yang ◽  
Wei Yan ◽  
Yu Han ◽  
Ximing Qu ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Proton Exchange Membrane ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Single Atom ◽  
Geometric Deformation ◽  
Orr Activity ◽  
Co Nanoparticles ◽  
Exchange Membrane

Co single-atom (CoSA) catalysts of the CoN4 moiety usually show an unsatisfactory oxygen reduction reaction (ORR) activity due to poor O2 activation.

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

2020 ◽  
Vol 11 (23) ◽  
pp. 5994-5999 ◽  
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.

Sign in / Sign up

Export Citation Format

Share Document