Sub-nanometer Pt cluster decoration enhances the oxygen reduction reaction performances of NiOx supported Pd nano-islands

2020 ◽  
Vol 4 (2) ◽  
pp. 809-823 ◽  
Author(s):  
Dinesh Bhalothia ◽  
Sheng Dai ◽  
Sheng-Po Wang ◽  
Che Yan ◽  
Tzu-Hsi Huang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Galvanic Replacement ◽  
Hydration Kinetics ◽  
Defect Sites ◽  
Pt Cluster ◽  
Orr Activity ◽  
Supported Pd

With suitable Pt4+ loading for galvanic replacement, Pt clusters will fill in the defect sites on Ni@Pd–Pt (step 1 and step 2). In this event, the overlap between O2 splitting and hydration kinetics optimize the ORR activity of a Pt cluster decorated Ni@Pd NC.

Effects of Pt metal loading on the atomic restructure and oxygen reduction reaction performance of Pt-cluster decorated Cu@Pd electrocatalysts

2019 ◽  
Vol 3 (7) ◽  
pp. 1668-1681 ◽  
Author(s):  
Dinesh Bhalothia ◽  
Cheng-Yang Lin ◽  
Che Yan ◽  
Ya-Tang Yang ◽  
Tsan-Yao Chen
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Pd Nanoparticles ◽  
Reduction Reaction ◽  
Galvanic Replacement ◽  
Metal Loading ◽  
Disordered Structure ◽  
Pt Cluster ◽  
Reaction Performance

Galvanic replacement dominates the structure of Pt decorated Cu@Pd nanoparticles. With proper Pt loading, it converts Cu@Pd-Pt from a surface disordered structure to multiple twin particles (MTPS) and gain the highest stability in the oxygen reduction reaction among the experimental samples.

Toward synergy of carbon and La2O3 in their hybrid as an efficient catalyst for the oxygen reduction reaction

RSC Advances ◽  
2016 ◽  
Vol 6 (81) ◽  
pp. 77786-77795 ◽  
Author(s):  
Nan Wang ◽  
Jingjun Liu ◽  
Weiwei Gu ◽  
Ye Song ◽  
Feng Wang
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Efficient Catalyst ◽  
Covalent Bonds ◽  
Orr Activity

The interficial covalent bonds formed in La2O3/C hybrid are responsible for its enhanced ORR activity.

Carbon-supported Pd nanocatalyst modified by non-metal phosphorus for the oxygen reduction reaction

2008 ◽  
Vol 182 (1) ◽  
pp. 91-94 ◽  
Author(s):  
Lifeng Cheng ◽  
Zhonghua Zhang ◽  
Wenxin Niu ◽  
Guobao Xu ◽  
Liande Zhu
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Supported Pd

Diagnosis of the measurement inconsistencies of carbon-based electrocatalysts for the oxygen reduction reaction in alkaline media

RSC Advances ◽  
2015 ◽  
Vol 5 (2) ◽  
pp. 1571-1580 ◽  
Author(s):  
Dongyoon Shin ◽  
Beomgyun Jeong ◽  
Myounghoon Choun ◽  
Joey D. Ocon ◽  
Jaeyoung Lee
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Testing Methodology ◽  
Orr Activity ◽  
Carbon Based

An optimal catalyst testing methodology that could allow precise benchmarking to obtain standardized ORR activity is put forward.

scholarly journals Synthesis of P- and N-doped carbon catalysts for the oxygen reduction reaction via controlled phosphoric acid treatment of folic acid

2019 ◽  
Author(s):  
Rieko Kobayashi ◽  
Takafumi Ishii ◽  
Yasuo Imashiro ◽  
Jun-ichi Ozaki
Keyword(s):  
Folic Acid ◽  
Phosphoric Acid ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Acid Treatment ◽  
Reduction Reaction ◽  
P Content ◽  
Orr Activity ◽  
Carbon Catalysts ◽  
Pyridinic N

Herein, we synthesized N- and P-doped carbons (PN-doped carbons) by controlled phosphoric acid treatment (CPAT) of folic acid (FA) and probed their ability to catalyze the oxygen reduction reaction at the cathode of a fuel cell. Precursors obtained by heating FA in the presence of phosphoric acid at temperatures of 400–1000 °C were further annealed at 1000 °C to afford PN-doped carbons. The extent of precursor P-doping was maximized at 700 °C, and the use of higher temperatures resulted in activation and increased porosity rather than in increased P content. The P/C atomic ratios of PN-doped carbons were well correlated with those of precursors, which indicated that CPAT was well suited for the preparation of PN-doped carbons. Carbon prepared using a CPAT temperature of 700 °C exhibited the highest oxygen reduction reaction (ORR) activity and was shown to contain –C–PO2 and –C–PO3 moieties as the major P species and pyridinic N as the major N species; moreover, no N–P bonds were detected. The presence of –C–PO2 and –C–PO3 units was concluded to decrease the work function and thus raise the Fermi level above the standard O2/H2O reduction potential, which resulted in enhanced ORR activity. Finally, CPAT was concluded to be applicable to the synthesis of PN-doped carbons from N-containing organic compounds other than FA.

scholarly journals The mechanism of Co oxyhydroxide nano-islands deposited on a Pt surface to promote the oxygen reduction reaction at the cathode of fuel cells

RSC Advances ◽  
2020 ◽  
Vol 10 (73) ◽  
pp. 44719-44727
Author(s):  
Jinghao Lu ◽  
Libin Yang ◽  
Wei Guo ◽  
Songtao Xiao ◽  
Lingyu Wang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Binding Energy ◽  
Oxygen Reduction Reaction ◽  
Bond Length ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Band Center ◽  
Orr Activity ◽  
Positive Effect

The Pt–OCoOH structure has a positive effect on the ORR; the bond length, binding energy and d-band center were investigated to explain the improved ORR activity.

scholarly journals MOF-Derived CuPt/NC Electrocatalyst for Oxygen Reduction Reaction

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 799 ◽  
Author(s):  
Rehan Anwar ◽  
Naseem Iqbal ◽  
Saadia Hanif ◽  
Tayyaba Noor ◽  
Xuan Shi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Photoelectron Spectroscopy ◽  
Rotating Disk ◽  
Reduction Reaction ◽  
Rotating Disk Electrode ◽  
X Ray ◽  
Onset Potential ◽  
Orr Activity

Metal-organic frameworks (MOFs) have been at the center stage of material science in the recent past because of their structural properties and wide applications in catalysis. MOFs have also been used as hard templates for the preparation of catalysts. In this study, highly active CuPt/NC electrocatalyst was synthesized by pyrolyzing Cu-tpa MOF along with Pt precursor under flowing Ar-H2 atmosphere. The catalyst was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray powder diffraction (XRD). Rotating disk electrode study was performed to determine the oxygen reduction reaction (ORR) activity for CuPt/NC in 0.1 M HClO4 at different revolutions per minute (400, 800, 1200, and 1600) and it was also compared with commercial Pt/C catalyst. Further the ORR performance was evaluated by K-L plots and Tafel slope. CuPt/NC shows excellent ORR performance with onset potential of 0.9 V (vs. RHE), which is comparable with commercial Pt/C. The ORR activity of CuPt/NC is demonstrated as an efficient electrocatalyst for fuel cell.

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