Ionomer dispersion solvent influence on the microstructure of Co–N–C catalyst layers for anion exchange membrane fuel cell

Zhang, Xiangwen; Pei, Yabiao; Zhu, Weikang; Liu, Yang; Yin, Yan; Guiver, Michael D.

doi:10.1016/j.jpowsour.2020.229259

Cited by 31 publications

(29 citation statements)

References 36 publications

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“…224 Similarly, the states of the anion-exchange ionomers are also determined by the nature of the solvents. 223 Table 4 Summary of the solubility parameters and dielectric constants of solvents and Nafion ionomer. 211,218 Solvent or ionomer Solubility parameter (cal cm Increasing the drying temperature accelerates molecular motions and leads to the ordering (or crystalline) of the ionomers.…”

Section: Addition Of Ionomers In the Clsmentioning

confidence: 99%

The role of electrode wettability in electrochemical reduction of carbon dioxide

et al. 2021

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Section: Addition Of Ionomers In the Clsmentioning

confidence: 99%

The role of electrode wettability in electrochemical reduction of carbon dioxide

et al. 2021

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“…The performances of various non-precious metal catalysts are listed in Table 5 . [ 15 , 16 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ] Obviously, the P max values depend on the weights of the catalysts in both electrodes and types of anode catalysts as well. This work demonstrates high P max with only 20% Pt/C in the anode, compared to those using expensive Ru-Pt/C.…”

Section: Resultsmentioning

confidence: 99%

Cobalt-Based Cathode Catalysts for Oxygen-Reduction Reaction in an Anion Exchange Membrane Fuel Cell

Hsieh¹,

Wang²,

Ho³

2022

Membranes

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A novel cobalt-chelating polyimine (Co-PIM) containing an additional amine group is prepared from the condensation polymerization of diethylene triamine (DETA) and terephthalalehyde (PTAl) by the Schiff reaction. A Co, N-co-doped carbon material (Co-N-C), obtained from two-stage calcination in different gas atmospheres is used as the cathode catalyst of an anion exchange membrane fuel cell (AEMFC). The Co-N-C catalyst demonstrates a CoNx-type single-atom structure seen under high-resolution transmission electron microscopy (HRTEM). The Co-N-C catalysts are characterized by FTIR, XRD, and Raman spectroscopy as well. Their morphologies are also illustrated by SEM and TEM micrographs, respectively. Surface area and pore size distribution are found by BET analysis. Co-N-C catalysts exhibit a remarkable oxygen reduction reaction (ORR) at 0.8 V in the KOH(aq). From the LSV (linear-sweeping voltammetry) curves, the onset potential relative to RHE is 1.19–1.37 V, the half wave potential is 0.73–0.78 V, the Tafel slopes are 76.9–93.6 mV dec−1, and the average number of exchange electrons is 3.81. The limiting reduction current of CoNC-1000A-900 is almost the same as that of commercial 20 wt% Pt-deposited carbon particles (Pt/C), and the max power density (Pmax) of the single cell using CoNC-1000A-900 as the cathode catalyst reaches 361 mW cm−2, which is higher than Pt/C (284 mW cm−2).

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“…In other words, calcination applied to improve the conductivity of the Pt-implanted matrix is not suitable for preparing Pt-based catalysts. To avoid spending the high expense and trouble of finding suitable conducting media for precious metal catalysts like Pt, single atom catalysts (SACs), such as Fe-or Co-related compounds [12][13][14][15][16], have become promising substituents for Pt. SACs are usually prepared in the carbonaceous frameworks through calcination with metal elements covalently bonded in the carbon matrix.…”

Section: Introductionmentioning

confidence: 99%

Cobalt-Doped Carbon Nitride Frameworks Obtained from Calcined Aromatic Polyimines as Cathode Catalyst of Anion Exchange Membrane Fuel Cells

Hsieh¹,

Chen²,

Wang³

et al. 2022

Membranes

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Cobalt-doped carbon nitride frameworks (CoNC) were prepared from the calcination of Co-chelated aromatic polyimines (APIM) synthesized from stepwise polymerization of p-phenylene diamine (PDA) and o-phthalaldehyde (OPAl) via Schiff base reactions in the presence of cobalt (II) chloride. The Co-chelated APIM (Co-APIM) precursor converted to CoNC after calcination in two-step heating with the second step performed at 100 °C lower than the first one. The CoNCs demonstrated that its Co, N-co-doped carbonaceous framework contained both graphene and carbon nanotube, as characterized by X-ray diffraction pattern, Raman spectra, and TEM micropictures. CoNCs also revealed a significant ORR peak in the current–voltage polarization cycle and a higher O2 reduction current than that of commercial Pt/C in a linear scanning voltage test in O2-saturated KOH(aq). The calculated e-transferred number even reaches 3.94 in KOH(aq) for the CoNC1000A900 cathode catalyst, which has the highest BET surface area of 393.94 m2 g−1. Single cells of anion exchange membrane fuel cells (AEMFCs) are fabricated using different CoNCs as the cathode catalysts, and CoNC1000A900 demonstrates a peak power density of 374.3 compared to the 334.7 mW cm−2 obtained from the single cell using Pt/C as the cathode catalyst.

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Ionomer dispersion solvent influence on the microstructure of Co–N–C catalyst layers for anion exchange membrane fuel cell

Cited by 31 publications

References 36 publications

The role of electrode wettability in electrochemical reduction of carbon dioxide

The role of electrode wettability in electrochemical reduction of carbon dioxide

Cobalt-Based Cathode Catalysts for Oxygen-Reduction Reaction in an Anion Exchange Membrane Fuel Cell

Cobalt-Doped Carbon Nitride Frameworks Obtained from Calcined Aromatic Polyimines as Cathode Catalyst of Anion Exchange Membrane Fuel Cells

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