scholarly journals Low-Temperature Chemical Vapor Deposition Synthesis of Pt-Co Alloyed Nanoparticles with Enhanced Oxygen Reduction Reaction Catalysis

2016 ◽  
Vol 28 (33) ◽  
pp. 7115-7122 ◽  
Author(s):  
Dong Sung Choi ◽  
Alex W. Robertson ◽  
Jamie H. Warner ◽  
Sang Ouk Kim ◽  
Heeyeon Kim
Keyword(s):  
Chemical Vapor Deposition ◽  
Low Temperature ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Reduction Reaction

Edge-rich and (N, S)-doped 3D porous graphene as an efficient metal-free electrocatalyst for the oxygen reduction reaction

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90384-90387 ◽  
Author(s):  
Xiaobo Wu ◽  
Zhiyong Xie ◽  
Min Sun ◽  
Ting Lei ◽  
Zhenmin Zuo ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Reduction Reaction ◽  
Chemical Corrosion ◽  
Metal Free ◽  
Porous Graphene

A novel edge-rich and (N, S)-doped 3D porous graphene was synthesized by chemical vapor deposition (CVD) and chemical corrosion.

Oxygen Reduction Performance of Pt/TiO2-C Electrocatalyst prepared by Two-step Chemical Vapor Deposition

2012 ◽  
Vol 15 (3) ◽  
pp. 123-128 ◽  
Author(s):  
R.G. González Huerta ◽  
M.A. Valenzuela ◽  
R. Vargas García ◽  
N. Alonso-Vante ◽  
M. Tufiño Velázquez ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Acid Medium ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Reduction Reaction ◽  
Chemical Vapor Deposition Method ◽  
Active Surface Area ◽  
Co Stripping

The low durability of Pt/C electro-catalysts in polymer electrolyte membrane fuel cells (PEMFC), e.g., as a result of carbon oxidation to CO2 in an acid medium, has been recognized as one of the most important hindrances to long-term stability. In this work, Pt electrocatalysts supported on TiO2-carbon and Vulcan carbon were prepared by the chemical vapor deposition method. The physical and electrochemical properties of Pt/TiO2-C and Pt/C electrocatalysts were investigated by the characterization techniques of XRD, TEM, CO stripping and cyclic and linear voltammetry. The prepared materials were electrochemically evaluated in the oxygen reduction reaction (ORR) in an acid medium at room temperature. The XRD results show crystalline fcc platinum formation. The mean particle size is between 2 and 4 nm with a spherical morphology. Pt/TiO2-C electrocatalysts showed a higher electrochemical active surface area and better activity results for the ORR compared with the Pt/C samples. The addition of TiO2 to the conventional Pt/C catalyst modifies the electronic properties affecting the oxygen adsorption and improving the catalytic activity for the oxygen reduction reaction.

scholarly journals Chemical Vapor Deposition of Fe-N-C Oxygen Reduction Catalysts with Full Utilization of Dense Fe-N4 Sites

2020 ◽  
Author(s):  
Li Jiao ◽  
Jingkun Li ◽  
Lynne Larochelle Richard ◽  
Qiang Sun ◽  
Thomas Stracensky ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Oxygen Reduction ◽  
Vapor Deposition ◽  
Proton Exchange Membrane ◽  
Chemical Vapor ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Iron Chloride ◽  
Site Density ◽  
Oxygen Reduction Catalysts

Replacing scarce and expensive platinum (Pt) with metal-nitrogen-carbon (M-N-C) catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs) has largely been impeded by the low activity of M-N-C, in turn limited by low site density and low site utilization. Herein, we overcome these limits by implementing chemical vapor deposition (CVD) to synthesize Fe-N-C, an approach fundamentally different from previous routes. The Fe-N-C catalyst, prepared by flowing iron chloride vapor above a N-C substrate at 750 ℃, has a record Fe-N<sub>4</sub> site density of 2×10<sup>20</sup> sites·gram<sup>-1</sup> with 100% site utilization. A combination of characterizations shows that the Fe-N<sub>4</sub> sites formed via CVD are located exclusively on the outer-surface, accessible by air, and electrochemically active. This catalyst delivers an unprecedented current density of 33 mA·cm<sup>-2</sup> at 0.90 V<i><sub>i</sub></i><sub>R-free</sub> (<i>iR</i>-corrected) in an H<sub>2</sub>-O<sub>2</sub> PEMFC at 1.0 bar and 80 ℃.

scholarly journals Chemical Vapor Deposition of Fe-N-C Oxygen Reduction Catalysts with Full Utilization of Dense Fe-N4 Sites

2020 ◽  
Author(s):  
Li Jiao ◽  
Jingkun Li ◽  
Lynne Larochelle Richard ◽  
Qiang Sun ◽  
Thomas Stracensky ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Oxygen Reduction ◽  
Vapor Deposition ◽  
Proton Exchange Membrane ◽  
Chemical Vapor ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Iron Chloride ◽  
Site Density ◽  
Oxygen Reduction Catalysts

Replacing scarce and expensive platinum (Pt) with metal-nitrogen-carbon (M-N-C) catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs) has largely been impeded by the low activity of M-N-C, in turn limited by low site density and low site utilization. Herein, we overcome these limits by implementing chemical vapor deposition (CVD) to synthesize Fe-N-C, an approach fundamentally different from previous routes. The Fe-N-C catalyst, prepared by flowing iron chloride vapor above a N-C substrate at 750 ℃, has a record Fe-N<sub>4</sub> site density of 2×10<sup>20</sup> sites·gram<sup>-1</sup> with 100% site utilization. A combination of characterizations shows that the Fe-N<sub>4</sub> sites formed via CVD are located exclusively on the outer-surface, accessible by air, and electrochemically active. This catalyst delivers an unprecedented current density of 33 mA·cm<sup>-2</sup> at 0.90 V<i><sub>i</sub></i><sub>R-free</sub> (<i>iR</i>-corrected) in an H<sub>2</sub>-O<sub>2</sub> PEMFC at 1.0 bar and 80 ℃.

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