Abstract
Electrochemical hydrogen evolution reaction (HER) coupled with microplastics reforming are critical for marine energy and environmental engineering, but filled with challenges. Herein, Ni3N/W5N4 Janus nanostructure with barrier-free heterointerface was designed via transition metal nitrides-inducing growth strategy. Benefiting from the interface synergistic effect, super-hydrophilic surface and multilevel Janus structure, Ni3N/W5N4 electrode displays Pt-like HER performance and the outstanding stability (~300 h) under industrially current. Meanwhile, Ni3N/W5N4 also exhibits high activity and selectivity toward electro-reforming of plastics, showing an ultralow overpotential of 1.33 V (η10) and generating the value-added HCOOH with the high Faradic efficiency of ~85%. Impressively, driven by solar panels, the bifunctional Ni3N/W5N4 electrocatalyst achieves the highly efficient production of H2 and HCOOH (η10 =1.4 V, ηsolar to hydrogen=16.04%) in seawater full of plastics. This work underlines the on-site upgrading of plastic wastes and energy-saving hydrogen evolution in seawater enabled by the design of Janus heterostructures for metal nitrides.
Published Version
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