Promoting photocarrier separation for photoelectrochemical water splitting in α-Fe2O3@C
Source abstract
Abstract
Core-shell-nanostructured hematite@graphite (α-Fe2O3@C) for photoelectrochemical (PEC) water splitting was innovatively prepared from graphite-encapsulated iron (Fe@C) nanoparticles by the arc-discharge method. The graphite was successfully controlled from dozens to few layers, and Fe was transformed into α-Fe2O3 with particle size of 20–30 nm during the thermal oxidation. α-Fe2O3@C was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy techniques. The photocurrent density of α-Fe2O3@C reached a maximum of 20 μA/cm2 at 1.23 VRHE when there were 2–3 layers of graphite and the film thickness was 200 nm. Herein, graphite was proven to play the key role in coupling between light blocking and enhanced photocarrier separation rather than changing the density of the oxygen vacancies. The addition of graphite layers enhanced the photocurrent density by 20 times compared with that of the bare α-Fe2O3 particle film derived from the hydrothermal method, which was further demonstrated by electrochemical impedance spectra (EIS).
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Iron oxide chemistry and applications · Mine drainage and remediation techniques · Arsenic contamination and mitigation
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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