Deciphering Z-scheme Charge Transfer Dynamics in Heterostructure NiFe-LDH/N-rGO/g-C3 N4 Nanocomposite for Photocatalytic Pollutant Removal and Water Splitting Reactions

Scientific Reports
Susanginee Nayak, K M Parida

Abstract

A series of heterostructure NiFe LDH/N-rGO/g-C3N4 nanocomposite were fabricated by combining calcinations-electrostatic self-assembly and hydrothermal steps. In this method, negatively charged N-rGO was electrostaticaly bonded to the self-assembled interface of n-n type g-C3N4/NiFe LDH hybrid. XRD and AFM results revealed successful formation of heterostructure nanocomposite due to the coupling effect of exfoliated NiFe LDH nanosheets with N-rGO and g-C3N4. Among the as synthesized heterostructure, CNNG3LDH performed superior photocatalytic activities towards 95 and 72% mineralization of RhB and phenol. Furthermore, CNNG3LDH could achieve the highest photocatalytic H2 evolution rate of 2508 μmolg-12h-1 and O2 evolution rate of 1280 μmolg-12h-1 under visible light irradiation. The CNNG3LDH possess lowest PL intensity, reduced arc of the Nyquist plot (43.8 Ώ) and highest photocurrent density (-0.97 mA cm-2) which revealed effective charge separation for superior photocatalytic activities. TRPL spectral results reveal the synergistic effect of layered component in CNNG3LDH for achievable higher life time of excitons of ~16.52 ns. In addition, N-rGO mediator based Z-scheme charge transfer mechanisms in CNNG3LDH were verified by the...Continue Reading

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Citations

May 19, 2021·Environmental Science and Pollution Research International·Ajay JoseKarthik Kasinathan
Oct 24, 2021·Chemistry, an Asian Journal·Xiaojiang WenGuang Liu

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Methods Mentioned

BETA
AFM
atomic force microscopy
light scattering
electron diffraction
X-ray
ESR
Fluorescence
transmission
equilibrium adsorption
irradiate

Software Mentioned

CNNG3LDH
CASA XPS
ORIGIN

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