In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 11, No. 4 ( 2023), p. 1927-1936
Abstract:
Photo-assisted electrocatalytic (P-EC) hydrogen evolution reaction (HER) has attracted extensive attention by directly integrating the photo- and electroactive materials, exhibiting dramatically improved activity and kinetics upon light irradiation. In this work, an efficient single-component P-EC catalyst was developed by growing Cu 5 FeS 4 quantum dots (QDs) on nickel foam (NF) in situ toward the concept approval of dual function integration in one particle. The optimized Cu 5 FeS 4 /NF catalyst displays a dramatic overpotential decrease from 118 mV to 52 mV at 10 mA cm −2 for HER under light, exceeding that reported for all transition metal sulfides. Moreover, to reach 100 mA cm −2 , it requires an overpotential of 242 mV, superior to commercial Pt/C (256 mV). The excellent P-EC performance is attributed to the effective integration of the induced photovoltage and promoted active sites in Cu 5 FeS 4 , as observed by the photoinduced flat-band potential increase and impedance decrease. Transient photovoltage spectroscopy indicated the promoted charge extraction kinetics in Cu 5 FeS 4 with Fe incorporation. DFT calculations confirm the decreased adsorption free energy of H* and promoted HER kinetics on Cu 5 FeS 4 with light. This work provides an effective fabrication strategy for the synergy of photo- and electrocatalysis in one particle. Understanding the mechanism also provides an interesting inspiration for integrated photoelectrocatalysis in other more challenging fields, such as carbon dioxide and nitrogen reduction.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702232-8
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