Nitrogen-containing carbon nanotubes as cathodic catalysts for proton exchange membrane fuel cells

Wong, Wai Yin; Daud, Wan Ramli Wan; Mohamad, Abu Bakar; Kadhum, Abdul Amir Hassan; Majlan, Edy Herianto; Loh, Kee Shyuan

doi:10.1016/j.diamond.2011.11.004

Cited by 49 publications

(26 citation statements)

References 113 publications

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“…It is known that synthesis conditions such as temperature, nitrogen precursor, feed gas composition and metal catalysts strongly affect the type and amount of N-functionalities in the doped material [41,[58][59][60]. Despite extensive research, it is not yet established whether pyridinic-N, pyrrolic-N or graphitic-N sites are the most active for ORR, as inferred from Table 3.…”

Section: Discussionmentioning

confidence: 98%

High oxygen reduction activity of few-walled carbon nanotubes with low nitrogen content

Borghei

Kanninen

Lundahl

et al. 2014

Applied Catalysis B: Environmental

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Section: Discussionmentioning

confidence: 98%

High oxygen reduction activity of few-walled carbon nanotubes with low nitrogen content

Borghei

Kanninen

Lundahl

et al. 2014

Applied Catalysis B: Environmental

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“…In both cases, fundamental chemical principles invoke a partial positive charge on this type of N heteroatom. As will be seen later on pyridinic N was outlined as the most important type of nitrogen in 1-D NCNSs considering number of different applications, but its association with edge plane exposure, which posses altered reactivity itself [28], must not be forgotten and will be discussed later on.…”

Section: Structure-properties Relationshipsmentioning

confidence: 99%

“…The major focus of research has been the preparation, characterization, processing and application of 1-D NCNSs (Fig. 1) [17,[20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

One-dimensional nitrogen-containing carbon nanostructures

Ćirić‐Marjanović

Pašti

Mentus

2015

Progress in Materials Science

115

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“…Quaternary-N accounts for 6.6% while pyridinic-N + -O À occupies 13.9%. It is well-known that pyridinic-N situated on the edge of the graphite planes promotes ORR by donating one p-electron to the aromatic p system [58][59][60].…”

Section: Support Synthesismentioning

confidence: 99%

Highly Active and Durable Co-Doped Pt/CCC Cathode Catalyst for Polymer Electrolyte Membrane Fuel Cells

Jung

Xie

Kim

et al. 2015

Electrochimica Acta

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A B S T R A C TCathode catalyst based on Co-doped Pt deposited on carbon composite catalyst (CCC) support with high measured activity and stability under potential cycling conditions for polymer electrolyte membrane (PEM) fuel cells was developed in this study. The catalyst was synthesized through platinum deposition on Co-doped CCC support containing pyridinic-nitrogen active sites followed by controlled heattreatment. High resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) studies confirmed uniform Pt deposition (Pt/CCC catalyst, d Pt = 2 nm) and formation of Co-doped Pt/CCC catalyst (d Pt = 5.4 nm) respectively. X-ray energy dispersive spectrometry (XEDS) line-scan studies showed the formation of Co-core Pt-shell type catalyst with a Pt-shell thickness of $0.75 nm. At 0.9 V iR-free , the Co-doped Pt/CCC catalyst showed initial mass activity of 0.44 A mg Pt À1 and 0.25 A mg Pt À1 after 30,000 potential cycles between 0.6 and 1.0 V corresponding to an overall measured activity loss of 42.8%. The commercial Pt-Co/C showed initial mass activity of 0.38 A mg Pt À1 and $70% loss of activity after 30,000 cycles. The enhanced catalytic activity at high potentials and stability of mass activity for the Co-doped Pt/CCC catalyst are attributed to the formation of compressive Pt lattice catalyst due to Co doping. The Co-doped Pt/CCC showed stable open circuit potential close to 1.0 V under H 2 -air with an initial power density of 857 mW cm À2 and only 16% loss after 30,000 cycles. Catalyst durability studies performed between 0.6 and 1.0 V indicated that Co doping increased the onset potential for PtO 2 formation close to 1.0 V vs. reversible hydrogen electrode (RHE). The enhanced catalytic activity and stability of Co-doped Pt/CCC catalyst are attributed to (i) higher onset potential for PtO 2 formation resulting in less PtO 2 formation during potential cycling which alleviates Pt dissolution in the reverse scan (ii) higher stability of CCC used as a support compared with commercially used supports, and (iii) optimized electrochemical properties of the catalyst and the support which result in synergistic effect between pyridinic nitrogen catalytic sites from the Co-doped CCC support and compressive Pt-lattice catalyst.

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Nitrogen-containing carbon nanotubes as cathodic catalysts for proton exchange membrane fuel cells

Cited by 49 publications

References 113 publications

High oxygen reduction activity of few-walled carbon nanotubes with low nitrogen content

High oxygen reduction activity of few-walled carbon nanotubes with low nitrogen content

One-dimensional nitrogen-containing carbon nanostructures

Highly Active and Durable Co-Doped Pt/CCC Cathode Catalyst for Polymer Electrolyte Membrane Fuel Cells

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