High-Entropy Alloy Nanoparticles/Biochar as an Efficient Catalyst for High-Performance Treatment of Organic Pollutants

Miao, Ling-Zhen; Guo, Yuxin; Liu, Ziyi; Li, Yang; Zhu, J.; Wu, Lei

doi:10.2139/ssrn.4385525

Cited by 1 publication

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“…Deconvoluted XPS spectra of each element's oxidation states are explained in the following section. Starting with Fe 2p scan (Figure S4B), the broad peak at 711.93 eV corresponds to Fe 2+ (2p 3/2 ), while the peak addressed at 725.94 eV shows Fe 2+ (2p 1/2 ) of Fe2p 44 . The other peaks appear at 719.95 and 733.15 eV, addressed as Fe 0 and satellite peaks, respectively, which possess mixed valance Fe state.…”

Section: Resultsmentioning

confidence: 98%

“…Starting with Fe 2p scan (Figure S4B), the broad peak at 711.93 eV corresponds to Fe 2+ (2p 3/2 ), while the peak addressed at 725.94 eV shows Fe 2+ (2p 1/2 ) of Fe2p. 44 The other peaks appear at 719.95 and 733.15 eV, addressed as Fe 0 and satellite peaks, respectively, which possess mixed valance Fe state. Also, from the deconvoluted XPS spectrum Co2p (Figure S4C), 780.89 (2p 3/2 ) and 796.55 eV (2p 3/2 ) peak ascribed to the Co 2+ of Co2p.…”

Section: Structural Characterizations Of Feconicumn Heamentioning

confidence: 99%

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Enhanced energy density of high entropy alloy (Fe‐Co‐Ni‐Cu‐Mn) and green graphene hybrid supercapacitor

Mohanty,

Chowde Gowda,

Gakhad

et al. 2024

Energy Storage

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Given the growing demand for new materials for supercapacitor applications, high entropy alloys (HEAs) are being extensively investigated. They are an efficient alternative to existing energy sources due to their synergistic contribution from individual element. We demonstrate the development of nanostructured HEA (FeCoNiCuMn) as a cathode material with specific capacitance (Cs) of ~388 F g−1 (5 mV s−1). As anode material, green graphene (rice straw biochar) synthesized using pyrolysis shows a maximum Cs of ~560 F g−1 at similar scan rate (5 mV s−1). A hybrid asymmetric liquid state device was assembled using the FeCoNiCuMn nanostructured HEA and green graphene as electrodes. Utilizing the green source, the device provided a high Cs of 83.22 F g−1 at 2 A g−1. The specific energy of the device was 33.4 Wh kg−1 and specific power of 1.7 kW kg−1. The electrochemical behavior of each element in the high entropy composition was studied through post X‐ray photoelectron spectroscopy and scanning electron microscopic analysis. The chemical behavior of FeCoNiCuMn is further investigated using DFT studies. The enhanced electrochemical properties and synergistic contribution of each element of the HEA is studied via d‐band theory. The current study can be utilized to develop asymmetric hybrid supercapacitors as environmental friendly energy source.

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Section: Resultsmentioning

confidence: 98%

Section: Structural Characterizations Of Feconicumn Heamentioning

confidence: 99%