Growth of Ag2S-sensitizer on MoS2/ZnO nanocable arrays for improved solar driven photoelectrochemical water splitting

Yann, Rem; Ngok, Sreymean; Mustafa, E.; Liu, Xianjie; Willander, Magnus; Chey, Chan Oeurn; Nur, Omer

doi:10.1016/j.solidstatesciences.2023.107379

Cited by 7 publications

(2 citation statements)

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“…The synergistic effect between the aforementioned electrolyte engineering, morphology control, and doping treatment renders the H 2 evolution rate over Bi:Ag 2 S/ZnO NRs as the photoelectrode markedly accelerated, as evidently manifested in its photocurrent density reaching 7 mA cm –2 (at ∼−0.35 V vs Ag/AgCl) under 1 sun illumination. Such outstanding performance, which far exceeds those reported for additional Ag 2 S-based photoelectrodes in the literature, clearly punctuates the great promise of the Bi:Ag 2 S/ZnO NRs developed in this work. ,− …”

Section: Introductionmentioning

confidence: 51%

“…Most notably, such outperformance is further seen in the comparison with those reported for Ag 2 S-based photoelectrodes in the literature, leading to Bi:Ag 2 S/ZnO NRs-6 brought into the forefront of the following discussions on the influences of the Bi 3+ dopant on the optical, electrical, and PEC properties of Bi:Ag 2 S/ZnO NRs (Table ). ,− To this end, undoped Ag 2 S/ZnO NRs as the reference are particularly prepared under almost the same conditions. Its photocurrent response under solar irradiation is first measured by means of LSV and further plotted in parallel with that of Bi:Ag 2 S/ZnO NRs for comparison to in this way highlight the major differences lying, on the one hand, in the saturation photocurrent density ( J sat ) (Figure b).…”

Section: Resultsmentioning

confidence: 99%

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Improving Photoelectrochemical Activity of a Silver Sulfide-Based Photoelectrode by Bismuth Doping for Hydrogen Evolution from Industrial Waste Water

Chen,

Kuo,

et al. 2024

ACS Appl. Energy Mater.

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Trivalent bismuth (Bi3+) is put forward for the first time as a multifunctional dopant to tailor the optoelectronic property of silver sulfide (Ag2S), which is known as a promising photoelectrode candidate in view of its narrow band gap of ∼1.1 eV comparable to that of its toxic PbS counterpart. The introduction of Bi3+ into Ag2S gives rise to Bi:Ag2S to harvest light with a photon energy even lower than 1.1 eV via providing additional energy levels within its band gap. The electrical conductivity of Bi:Ag2S is also improved via offering extra free electrons to increase the carrier concentration to facilitate the transport of photoexcited electron–hole pairs. As an additional result of such increment in electron density is the Fermi level of Bi:Ag2S closer to its conduction band edge, leading to its potential difference with respect to that of the sulfide (S2–) and sulfite (SO3 2–) redox couples present in large quantity in industrial wastewater markedly amplified. More importantly, the degree of surface band bending is thereby well-strengthened to promote the separation of the photogenerated electron–hole pairs, which is further reinforced by depositing Bi:Ag2S on the zinc oxide nanorods (ZnO NRs) to form a Bi:Ag2S/ZnO NR heterojunction. The synergistic effect of the aforesaid enhancements renders the hydrogen evolution rate over Bi:Ag2S/ZnO NRs largely accelerated, as evidently manifested in its photocurrent density achieving 7 mA cm–2, far exceeding those reported for additional Ag2S-based photoelectrodes in the literature, of which the great promise is in view of such outperformance well-corroborated.

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