Sacrificial template induced Fe-, N-, and S-tridoped hollow carbon sphere as a highly efficient electrocatalyst for oxygen reduction reaction

An, Hyelin; Min, Kyeongseok; Lee, Yeeun; Na, Rin; Shim, Sang Eun; Baeck, Sung‐Hyeon

doi:10.1016/j.mcat.2022.112589

Cited by 2 publications

(2 citation statements)

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“…As shown in the isotherm curves, a significant hysteresis loop was observed for Fe-CoP and V P -Fe-CoP in the relative pressure range of 0.5 to 1.0, implying the existence of a mesoporous structure along with the formation of a well-defined hollow structure. [27,35] From the BET analysis, the specific surface area and total pore volume of FeCoG, Fe-CoP, and V P -Fe-CoP were found to be 10.39, 41.28, and 60.89 m 2 g −1, and 0.014, 0.276, and 0.353 cm 3 g −1 , respectively. The highest specific surface area and pore volume of V P -Fe-CoP indicate that the formation of a hollow structure and the introduction of structural defects can effectively increase the exposure of the number of available active sites for electrochemical water splitting.…”

Section: Physical Characterization Of Electrocatalystsmentioning

confidence: 99%

“…Additionally, the diffusion length for both mass and charge transport can be significantly reduced in the hollow structure, which is helpful for enhancing electrocatalytic performance in an aqueous solution. [4,27,28] Consequently, V P -Fe-CoP exhibited excellent bifunctional activities toward both OER and HER with low overpotentials of 300 and 143 mV, respectively, to achieve a current density of 10 mA cm −2 . In addition, the symmetric water electrolysis cell assembled with V P -Fe-CoP as a bifunctional electrocatalyst showed a low cell voltage of only 1.63 V and long-term durability over 100 h in an alkaline solution.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Electrocatalytic Performance for Overall Water Splitting using Hollow Structured Fe‐doped CoP with Phosphorus Vacancies

Min

Kim

et al. 2023

Advanced Sustainable Systems

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Water electrolysis is a promising method for producing ultra‐pure hydrogen as a sustainable energy source in the future. In this study, the use of a hollow‐structured Fe‐doped CoP with an abundance of phosphorus defects for both oxygen and hydrogen evolution reactions (OER and HER) is suggested. The as‐prepared electrocatalyst has a low overpotential of 300 and 143 mV to achieve a current density of 10 mA cm−2 for the OER and HER, respectively. When the synthesized electrocatalyst is used as both anode and cathode in a water electrolyzer, the full cell requires a very small cell voltage of 1.63 V at 10 mA cm−2 and exhibits excellent stability for over 100 h. The excellent performance is due to the generation of numerous electrocatalytic active sites induced by introduction of structural defects such as Fe dopants and P vacancies, which modify the adsorption energy of reaction intermediates during water electrolysis. This study can offer new insights into the development of efficient precious metal‐free electrocatalysts for production of renewable energy sources.

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Section: Physical Characterization Of Electrocatalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing Electrocatalytic Performance for Overall Water Splitting using Hollow Structured Fe‐doped CoP with Phosphorus Vacancies

Min

Kim

et al. 2023

Advanced Sustainable Systems

Self Cite

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In‐Situ HF Forming Agents for Sustainable Manufacturing of Iron‐Based Oxygen Reduction Reaction Electrocatalysis Synthesized Through Sacrificial Support Method

Mostoni,

Mirizzi,

Frigerio

et al. 2024

ChemSusChem

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Fe‐Nx‐Cs being suitable to replace scarce and overpriced platinum group metals (PGMs) for cathodic oxygen reduction reaction (ORR) are gaining significant importance in the fuel cell arena. Although the typical sacrificial support method (SSM) ensures the superior electrocatalytic activity of derived Fe‐Nx‐C, removing silica hard templates always remains a great challenge due to the hazardous use of highly toxic and not environmentally friendly hydrofluoric acid. Herein, strategic insight was given to modified SSM by exploiting the in‐situ formation of HF, deriving from the decomposition of NH4HF2 and NaF, to dissolve silica templates, thus avoiding the direct use of HF. First, the suitable molar ratio between the etching agent and the silica was analyzed, revealing that NH4HF2 efficiently dissolved silica even in a stoichiometric amount, whereas an excess of NaF was required. However, both etching agents exhibited conformal removal of silica while dispersed active moieties within the highly porous architecture of derived electrocatalysts were left behind. Moreover, NH4HF2‐washed counterparts demonstrated relatively higher performance both in acidic and alkaline media. Notably, with NH4HF2‐washed Fe‐Nx‐C electrocatalyst a remarkable onset potential of 970 mV (vs RHE) was achieved with nearly tetra‐electronic ORR as the peroxide yield remained less than 10% in the alkaline medium.

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Sacrificial template induced Fe-, N-, and S-tridoped hollow carbon sphere as a highly efficient electrocatalyst for oxygen reduction reaction

Cited by 2 publications

References 60 publications

Enhancing Electrocatalytic Performance for Overall Water Splitting using Hollow Structured Fe‐doped CoP with Phosphorus Vacancies

Enhancing Electrocatalytic Performance for Overall Water Splitting using Hollow Structured Fe‐doped CoP with Phosphorus Vacancies

In‐Situ HF Forming Agents for Sustainable Manufacturing of Iron‐Based Oxygen Reduction Reaction Electrocatalysis Synthesized Through Sacrificial Support Method

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