Wireless pulsed nanophotoelectrochemical cell for the ultrafast degradation of organic pollutants

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2024-05, Vol.487, p.150663, Article 150663
• Main Authors: Serrà, Albert, Gómez, Elvira, al Hoda al Bast, Nour, Zhang, Yue, Duque, Marcos, José Esplandiu, María, Esteve, Jaume, Nogués, Josep, Sepúlveda, Borja
• Format: Article
• Language: English
• Subjects: Advanced oxidation process; Antibiotics; Biotoxins; Heterogeneous catalysis; Nanophotoelectrochemical cell, wireless; Peroxymonosulfate; Water decontamination
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2024.150663

[Display omitted] •Innovative wireless nPEC cell uses pulsed light for rapid pollutant degradation.•Si pn photodiode integrates efficient Si-n/Au nanowire and Si-p/mesoporous-NiPt.•The cell achieves > 99 % degradation and > 98 % mineralization of various pollutants.•The cell enhances reaction kinetics even with light intensities 5 times lower than sunlight.•Pulsed light in 100–500 Hz range further improves efficiency, reducing energy input by half. An urgent demand exists for advanced-technologies to efficiently remove persistent organic pollutants from water, while minimizing energy consumption. Here, we introduce an innovative wireless nanophotoelectrochemical (nPEC) cell using pulsed light for the ultrafast degradation/mineralization of organic pollutants. The nPEC cell comprises a nanostructured Si-pn photodiode that monolithically integrates: (i) a Si-n/Au nanowire-based-photocathode for effective light absorption and photovoltage generation, and (ii) a Si-p/mesoporous-NiPt photoanode serving as catalyst to wirelessly amplify the sulfate radical production by low-intensity light without any bias voltage. The efficacy of the nPEC cell was shown by ultrafast degradation (>99 %) and mineralization (>98 %) of three emerging pollutants (tetracycline, levofloxacin and anatoxin-A). Notably, reaction kinetics were boosted by more than one order of magnitude when exposed to light intensities ca. 5-fold lower than sunlight. Remarkably, pulsed light beams in the 100–500 Hz range provided an additional enhancement in the degradation/mineralization efficiencies, reducing energy-input by half, while enhancing the catalyst's oxidation state and durability.