Self‐Assembled Fe–N‐Doped Carbon Nanotube Aerogels with Single‐Atom Catalyst Feature as High‐Efficiency Oxygen Reduction Electrocatalysts
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Introduction
- This report was prepared as an account of work sponsored by an agency of the United States Government.
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Frequently Asked Questions (12)
Q2. What is the description of the M-N-CNTAs?
Subsequent annealing treatment gives rise to the M-N-CNTAs characterized by advanced features including porous nanotube networks and homogeneity of active sites with single atom catalyst feature.
Q3. What is the promising class of NPMCs for ORR?
Among them, transition metal–nitrogen–carbon (M–N–C, M = Fe, Co) based nanomaterials have been considered as the most promising class of NPMCs for ORR due to their high ORR activity in both alkaline and acidic media. [11-15]
Q4. What is the common method of synthesizing carbon nanotubes?
Using tellurium nanowires as template and glucose as carbon precursor to synthesize carbon-based hydrogel was reported previously. [33]
Q5. What is the synthesis parameter that affects the ORR performance?
The other synthesis parameter that affects the ORR performance is the mass ratio between glucosamine hydrochloride and ammonium iron sulfate.
Q6. What is the effect of annealing on the ORR activity of Fe-N-?
The ORR performance at Fe-N-CNTAs-5-900 was proposed to be closely associated with the improved electrochemically active surface area (EASA) and carbon crystallinity.
Q7. What is the consensus on the nature of the active sites in M–N–C catalysts?
Although the nature of the active sites in M–N–C catalysts remains controversial in the scientific community, there is a consensus that the transition metal dopants enable them robust catalysts and both M–N moieties and nitrogen doping are critical for the enhanced ORR performance.
Q8. What is the first method used for the synthesis of M-N-C structures?
As for the first method, porous M-N-C structures were obtained through annealing treatment of nitrogen and metal precursors in the presence of 3D templates such as mesoporous silica and silica nanoparticles. [25-27]
Q9. What is the Tafel slope of the Fe-N-CNTAs-5-900?
In the potential region studied, the Fe-N-CNTAs-5-900 showed a Tafel slope of 87.8 mV dec -1 , almost the same with that of Pt/C catalysts, illustrating a good kinetic process for ORR.
Q10. What is the synthesis of M-N-doped carbon nanotubes?
Self-assembled M-N-doped carbon nanotube aerogels with single-atom catalyst feature are for the first time reported through one-step hydrothermal route and subsequent facile annealing treatment.
Q11. What is the description of the Fe-N-CNTAs?
As expected, the Fe-N-CNTAs-900 showed better long-term stability (Figure 3F) and tolerance to methanol crossover effect (Figure S9) than Pt/C. Significantly, TEM images in Figure S10 reveal that the structure of nanowires was well maintained after stability test, while Pt/C catalyst showed obvious aggregations, confirming the better stability of Fe-N-CNTAs-5-900 during electrochemical process.
Q12. What is the diffraction peak of Fe-N-CNTAs?
It is worth noting that the peak located at 398.3 eV is also ascribed to nitrogen bound to the metal (Fe−N) because of the small difference in binding energy between N−Fe and pyridinic-N. [18, 25]