Search

Inspired by natural photosynthesis, bio-photoelectrochemical (BPEC) cells based on photo-enzyme coupled catalysis hold great promise for energy conversion and chemical valorization. Here, we report an integrated BPEC system comprising a glucose dehydrogenase (GDH) modified meso-tetrakis(4-carboxyphenyl)-porphyrin/titanium dioxide (TCPP/TiO2) dye-sensitized photoanode and a mesoporous carbon hollow spheres/carbon paper (MCHS/CP) cathode for light-driven glucose oxidation and hydrogen peroxide (H2O2) production, respectively. Such a proposed bifunctional BPEC cell delivers a maximum power output of 0.24 ± 0.03 mW cm−2 with an open circuit voltage of 0.76 ± 0.01 V and achieves efficient H2O2 accumulation (rate: 0.94 ± 0.02 mM cm−2 h−1). Overall, our proof-of-concept assembly leverages the ascendancy of biocatalysis, photoelectrocatalysis, and electrosynthesis to provide an optimized design for biotic/abiotic coupling and expand the functional versatility of green energy devices. [ABSTRACT FROM AUTHOR]

Herein, we report a novel cobalt doped transition metal carbide-based OER electrocatalyst, cobalt doped β-molybdenum carbide (β-Mo2C) encapsulated by a nitrogen doped carbon framework, Co0.1-β-Mo2C@NC, which shows an unexpected onset overpotential of 200 mV and an overpotential of 262.2 mV at a current density of 10 mA cm−2. This strategy of cobalt doping reduces the amount of cobalt, and increases the density of active sites as well; furthermore, the introduction of molybdenum carbide enhances the stability of the catalyst. [ABSTRACT FROM AUTHOR]