Fe, N, S-doped porous carbon as oxygen reduction reaction catalyst in acidic medium with high activity and durability synthesized using CaCl 2 as template

陈驰,; 周志有,; 王宇成,; 张雪,; 杨晓冬,; 张新胜,; 孙世刚,

doi:10.1016/s1872-2067(17)62807-9

Cited by 21 publications

(1 citation statement)

References 27 publications

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“…Although such materials are low cost and have excellent stability, , their catalytic effect is far from that of Pt metal owing to their low catalytic activity, and therefore, there is a need to find ways to increase their catalytic activity. Recently, ORR electrocatalytic performance of carbon materials was illustrated to enhance, by doping and pretreatment, heteroatoms, such as nitrogen (N) atoms, − especially high pyridinic N content. − At the same time, the pretreatment of carbon materials can bring more surface-active functional groups; expose fresh carbon edges, microparticles, and defects; or enhance the specific surface area through the formation of porous membranes of the surface. , The surface state of the carbon material renders them activated, thereby enhancing the ORR catalytic performance . Additionally, it can broaden its ORR activity and stability in alkaline and acidic electrolytes. − …”

Section: Introductionmentioning

confidence: 99%

Boosting ORR Electrocatalytic Performance of Metal-Free Mesoporous Biomass Carbon by Synergism of Huge Specific Surface Area and Ultrahigh Pyridinic Nitrogen Doping

Zhang

Wang

Liu

et al. 2018

ACS Sustainable Chem. Eng.

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Oxygen reduction reaction (ORR) plays a critical position in direct methanol fuel cells. However, electrocatalytic materials currently utilized in ORR use a rare and expensive metal Pt, so it is vital to develop cathode catalysts with cheap and high ORR activity. Herein, chitosan, a natural material made from chitin, was employed as a complex precursor of carbon source and nitrogen (N) source to synthesize N-doped mesoporous biomass carbon ORR catalysts. Adding different pore agents regulated specific surface area and N type of catalysts. The relationship between the properties of the catalysts and their ORR electrocatalytic performance was investigated. It was luckily found that the addition of ferric nitrate as a pore-forming agent created a huge specific surface area of the N-doped mesoporous biomass carbon (1190 m 2 /g) significantly. More importantly, the synthesized catalyst was doped by whole pyridinic-N at high content (11.58 at %) and inhibited the two-electron reaction efficiently, promoted the four-electron reaction, and accelerated the ORR reaction rate. Furthermore, it provided significant catalytic activity with robust methanol tolerance, and notable cycle stability, indicating the practical applicability of the huge surface area, ultrahigh pyridinic-N-doped mesoporous biomass carbon catalyst.

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Section: Introductionmentioning

confidence: 99%

Boosting ORR Electrocatalytic Performance of Metal-Free Mesoporous Biomass Carbon by Synergism of Huge Specific Surface Area and Ultrahigh Pyridinic Nitrogen Doping

Zhang

Wang

Liu

et al. 2018

ACS Sustainable Chem. Eng.

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Surface Fluorination to Boost the Stability of the Fe/N/C Cathode in Proton Exchange Membrane Fuel Cells

et al. 2017

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The ternary Fe/N/C material is a promising non-precious-metal oxygen reduction electrocatalyst for proton exchange membrane cells (PEMFCs). However, its practical application is severely hampered by poor stability under PEMFC working conditions, especially at a cell voltage higher than 0.5 V. Herein, we report a new strategy to significantly improve the stability of the Fe/N/C catalyst in PEMFCs by covalent grafting of a trifluoromethylphenyl (Ar-CF 3 ) group. The hydrophobic character of Ar-CF 3 can effectively prevent water flooding of the Fe/N/ C catalyst layer, and thus form robust mass-transport channels for gasÀliquid two-phase flow. Simultaneously, both electronwithdrawing and hydrophobic properties considerably suppress the oxidative corrosion of the carbon matrix that hosts the catalytically active sites. Therefore, fluorinated Fe/N/C could perform stably over 100 h at 0.5 V with a current density of 0.56 A cm À2 in a H 2 ÀO 2 PEMFC. Even when the cell voltage increased to 0.6 V, only 15 % performance was lost after 100 h operation.[a] Dr.

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Nitrogen and Sulfur Enriched Porous Carbon Materials with Trace Fe Derived from Hyper‐Crosslinked Polymer as an Efficient Oxygen Reduction Electrocatalyst

et al. 2022

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Exploring and designing a non‐precious metal‐based electrocatalyst for oxygen reduction reactions with high efficiency is imperative for commercializing fuel cell technology. In the present work, an approach to synthesize N, and S ‐doped porous carbon catalysts with trace Fe derived from N, S enriched hyper‐crosslinked polymer for ORR by ZnCl2 activation at high temperature is described. The optimized catalyst (HCP‐NSZn‐900) exhibited an impressive catalytic activity towards ORR due to its high surface area, excellent porosity, and effective doping of Fe and heteroatoms. Accordingly, HCP‐NSZn‐900 demonstrates a high onset potential of 0.98 V (vs. RHE) with a large diffusion‐limited current density of 4.72 mA cm−2, and improved tolerance to methanol crossover, significantly longer durability in contrast to the Pt/C catalyst. Furthermore, HCP‐NSZn‐900 confirmed the 4‐electron transfer selectivity (n∼4.0). Therefore, the synthesized materials could be a potential replacement for Pt/C catalyst for energy conversion technologies.

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Fe, N, S-doped porous carbon as oxygen reduction reaction catalyst in acidic medium with high activity and durability synthesized using CaCl 2 as template

Cited by 21 publications

References 27 publications

Boosting ORR Electrocatalytic Performance of Metal-Free Mesoporous Biomass Carbon by Synergism of Huge Specific Surface Area and Ultrahigh Pyridinic Nitrogen Doping

Boosting ORR Electrocatalytic Performance of Metal-Free Mesoporous Biomass Carbon by Synergism of Huge Specific Surface Area and Ultrahigh Pyridinic Nitrogen Doping

Surface Fluorination to Boost the Stability of the Fe/N/C Cathode in Proton Exchange Membrane Fuel Cells

Nitrogen and Sulfur Enriched Porous Carbon Materials with Trace Fe Derived from Hyper‐Crosslinked Polymer as an Efficient Oxygen Reduction Electrocatalyst

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