In situ synthesis of sustainable highly efficient single iron atoms anchored on nitrogen doped carbon derived from renewable biomass

Wang, Xilong; Du, Jian; Zhang, Qinghua; Gu, Lin; Cao, Lijuan; Liang, Han‐Pu

doi:10.1016/j.carbon.2019.10.054

Cited by 75 publications

(45 citation statements)

References 37 publications

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“…Furthermore, the RDE measurements were performed at rotate speeds of 400, 625, 900, 1025, 1600, and 2025 rpm to obtain the Koutecky–Levich (K–L) plots of HPCM‐5. The calculated transfer number of HPCM‐5 (Figure 3b) reaches 3.9, suggesting the migration of adsorbed oxygen intermediates is likely to be the rate‐determining step for these electrocatalysts 1b,25,26. The ORR efficiency of HPCM‐5 was further assessed on rotating ring‐disk electrodes (RRDE) to calculate the electron transfer numbers and amount of peroxide (HO 2 − ) of HPCM‐5 during ORR process (Figure 3c).…”

Section: Resultsmentioning

confidence: 99%

Simultaneously Realizing Rapid Electron Transfer and Mass Transport in Jellyfish‐Like Mott–Schottky Nanoreactors for Oxygen Reduction Reaction

Sun

Wang

Zhang

et al. 2020

Adv Funct Materials

205

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Fundamental understanding of constructing elevated catalysts to realize fast electron transfer and rapid mass transport in oxygen reduction reaction (ORR) chemistry by interface regulation and structure design is important but still ambiguous. Herein, a novel jellyfish-like Mott-Schottkytype electrocatalyst is developed to realize fast electron transfer and decipher the structure-mass transport connection during ORR process. Both spectroscopy techniques and density functional theory calculation demonstrate electrons spontaneously transfer from Fe to N-doped graphited carbon at the heterojunction interface, thus accelerating electron transfer from electrode to reactant. Dynamic analysis indicates unique structure can significantly improve mass transport of oxygen-species due to two factors: one is electrolyte streaming effect caused by tentacle-like carbon nanotubes; the other is effective collision probability in the semiclosed cavity. Therefore, this Mott-Schottky-type catalyst delievers superior ORR performance with high onset potential, positive half wave potential, and large current density. It also exhibits low overpotential when serving as an air cathode in Zn-air batteries. This work deepens understanding of the two key factors-electron transfer and mass transport-on determining the kinetic reaction of ORR process and offers a new avenue in constructing efficient Mott-Schottky electrocatalysts.

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Section: Resultsmentioning

confidence: 99%

Simultaneously Realizing Rapid Electron Transfer and Mass Transport in Jellyfish‐Like Mott–Schottky Nanoreactors for Oxygen Reduction Reaction

Sun

Wang

Zhang

et al. 2020

Adv Funct Materials

205

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show abstract

“…The selected area electron diffraction (SAED) pattern (Figure 2e) shows a typical amorphous diffraction ring, revealing graphitization properties, and the high-resolution TEM (HRTEM) results (Figure 2f) showed significant graphitized carbon layers (0.34 nm) in Cu-N-SC-1100. 37 In addition, some 0.21 nm crystallographic spacings wrapped by carbon layers were also observed in the HRTEM image, which align with the (111) plane of crystalline Cu. 33,38 This indicates that NH 3 causes the Cu atoms to migrate and successfully anchor in the graphitic carbon layer with some small-scale ordering.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Advanced Trifunctional Electrocatalysis with Cu-, N-, S-Doped Defect-Rich Porous Carbon for Rechargeable Zn–Air Batteries and Self-Driven Water Splitting

Wang

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

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Fuel cells and water splitting are promising sustainable energy storage and conversion systems that can facilitate the usage of renewable resources and reduce the reliance on fossil fuels. These applications require catalysts to perform the required oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). It would be ideal to use a non-noble metal-based multifunctional catalyst for these reactions. Herein, a new type of porous carbon doped with Cu, N, S was prepared as a trifunctional catalyst for the ORR, OER, and HER from S-rich polyphenylene sulfide (PPS). By oxidatively treating the PPS, we critically prevented high-temperature melting of the precursor. Further, high-temperature pyrolysis using ammonia (NH 3 ) desulfurized and introduced N into the carbon matrix, increasing structural defects and the surface area. By introducing copper during the pyrolysis, the tridoped (Cu, N, S) catalyst was successfully synthesized. The extremely large number of active sites and the local chemical environment enable excellent electrocatalytic performance and stability across ORR, OER, and HER at levels superior or comparable to noble metals. This catalyst was also used as the sole catalyst in Zn−air batteries and overall water splitting to demonstrate excellent performance. This synthesis method can pave the way toward new catalyst design and discovery, enabling more versatile and robust energy applications.

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“…Many biomass materials have been used as precursors to fabricate ORR catalysts with low cost but outstanding activity, reasonable stability and long durability [117][118][119][120]. For example, Liang et al [121] reported a facile and cost-effective strategy to in situ synthesize efficient Fe-N/C catalysts with renewable Auricularia auricular-judae as the biomass precursor (Fig. 8).…”

Section: Nature-inspired Precursorsmentioning

confidence: 99%

Insights into efficient transition metal-nitrogen/carbon oxygen reduction electrocatalysts

Wang

Weng

Yuan

2021

Journal of Energy Chemistry

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In situ synthesis of sustainable highly efficient single iron atoms anchored on nitrogen doped carbon derived from renewable biomass

Cited by 75 publications

References 37 publications

Simultaneously Realizing Rapid Electron Transfer and Mass Transport in Jellyfish‐Like Mott–Schottky Nanoreactors for Oxygen Reduction Reaction

Simultaneously Realizing Rapid Electron Transfer and Mass Transport in Jellyfish‐Like Mott–Schottky Nanoreactors for Oxygen Reduction Reaction

Advanced Trifunctional Electrocatalysis with Cu-, N-, S-Doped Defect-Rich Porous Carbon for Rechargeable Zn–Air Batteries and Self-Driven Water Splitting

Insights into efficient transition metal-nitrogen/carbon oxygen reduction electrocatalysts

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