Peroxidase-like activity of hollow sphere-like FeS₂/SC boosted by synergistic action of defects and S–C bonding

Abstract

Pyrite FeS2 has been applied as a peroxidase for easy preparation and low cost. However, the low peroxidase-like (POD) activity limited its wide application. A hollow sphere-like composite (FeS2/SC-5.3%) composited...

Tuning Band Gap in Fe-Doped g-C3N4by Zn for Enhanced Fenton-Like Catalytic Performance

“…Figure shows the CV and EIS curves after modification of the glassy carbon electrode with different catalysts at a scan rate of 50 mVs –1 in the acetate buffer solution (pH = 4.0). The EIS curves, the corresponding Nyquist plots, and data fittings implemented using the Randles circuit are shown in Figure a, where R s is the solution resistance, R ct is the electron transfer resistance, and CPE is the constant phase element . The R ct decreases from 1096, 1012, and 877.5 to 848.9 Ω with the Zn doping, indicating that the introduction of Zn promotes the electron transfer and the catalytic activity for the Fenton reaction. , The R ct further decreases from 1012 to 764.3 Ω after the addition of H 2 O 2 to the solution for 4Fe/1Zn-CN in Figure b, indicating a high electron transfer rate between the catalyst and H 2 O 2 .…”

Enhancement of the peroxidase-like activity of hollow spherical FexNi1−xS2/SC nanozymes

“…S1, † the molar ratio (Fe 2+ /Fe 3+ ) was 1.64 for FeS 2 /SC after the reaction, which was 2.18 before the reaction. 24 The molar ratio (Fe 2+ /Fe 3+ ) decreased about 24.8% for FeS 2 /SC after the reaction. These results mean that it is in favor of Fe 2+ formation with Ni cations.…”

“…3C, 161.69 and 162.73 eV in S 2p were attributed to the S 2p 3/2 and 2p 1/2 characteristic peaks of S 2 2− . 24 Two peaks at 164.21 and 165.43 eV correspond to the…”

“…6A. 24 The absorbance of the solution at 652 nm decreased significantly after the addition of IPA. When the concentration of IPA reached 6 M, the absorbance was close to 0, indicating the POD activity with • OH.…”

“…20 The hollow sphere-shaped carbon did not show activity. 24 The peroxidase (POD)-like activity of The experimental conditions affected the POD-like activity of the nanoenzyme. 30…”