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BV/In 2 O 3 /FeNi photoanode was rational designed and constructed by impregnation annealing and electrodeposition method. A stable photocurrent of 4.0 mA cm−2 was achieved at 1.23 V RHE under AM 1.5 G (100 mW cm−2), which can be ascribed to the synergistic effect of heterojunction structure and cocatalyst loading. [Display omitted] Bismuth vanadate (BiVO 4) is a promising nanomaterial for photoelectrochemical (PEC) water oxidation. However, the serious charge recombination and sluggish water oxidation kinetics limit its performance. Herein, an integrated photoanode was successfully constructed by modifying BiVO 4 (BV) with In 2 O 3 (In) layer and further decorating amorphous FeNi hydroxides (FeNi). The BV/In/FeNi photoanode exhibited a remarkable photocurrent density of 4.0 mA cm−2 at 1.23 V RHE , which is approximately 3.6 times larger than that of pure BV. And the water oxidation reaction kinetics has an over 200% increased. This improvement was mainly because the formation of BV/In heterojunction inhibited charge recombination, and the decoration of cocatalyst FeNi facilitated the water oxidation reaction kinetics and accelerated hole transfer to electrolyte. Our work provides another possible route to develop high-efficiency photoanodes for practical applications in solar conversion. [ABSTRACT FROM AUTHOR]

[Display omitted] • A smart strategy, interface "repairing", was proposed to effectively boost the photogenerated charge separation. • BV/NiO x /CoFe achieves a remarkably photocurrent density of 4.58 mA cm−2 at 1.23 V RHE , which is more than three-fold higher than BV photoanode. • The interface charge recombination and intrinsic photocorrosion can be efficiently suppressed through "fast" hole transfer kinetics. Photoelectrochemical (PEC) water splitting is an attractive strategy to convert and store of intermittent solar power into fuel energy. However, the detrimental charge recombination of photogenerated electrons and holes severely limits its efficiency. Despite electrocatalyst loading can obviously improve the PEC conversion efficiency, current systems still suffer from high recombination owing to the surface states. Herein, an interface "repairing" strategy is proposed to suppress the recombination at the semiconductor/electrocatalyst interface. NiO x layer acts as an interfacial repairing layer to efficiently extract photogenerated charge carriers and eliminate the surface states via high hole-transfer kinetics rather than as a traditional electrocatalyst. As expected, the resulting repaired system yields an impressive photocurrent density of 4.58 mA cm−2 at 1.23 V (vs. RHE), corresponding to a more than three-fold increase compared to BiVO 4 (1.40 mA cm−2). Our work offers an appealing maneuver to improve the water oxidation performance for the semiconductor/electrocatalyst coupling system. [ABSTRACT FROM AUTHOR]

[Display omitted] Photocatalysis utilizing solar energy is a promising strategy for mitigating energy crisis and environmental pollution. Exploring a cost-effective, stable, eco-friendly, and efficient photocatalytic system is extremely urgent. Herein, copper encapsulated within nitrogen-doped carbon nanosphere (Cu@N C) possessing a unique core-shell structure with high catalytic activity was prepared by ion-exchange and pyrolysis using resin as support. The protective carbon shell can prevent the leaching of metal ions and deactivation of the catalyst. Benefiting from the special structure, Cu@N C exhibited excellent activity and durability toward the degradation of tetracycline by the activation of peroxymonosulfate (PMS). The radical trapping experiments and electron spin resonance analyses were applied to elucidate the main reactive species. This work highlights the great potential of Cu@N C core-shell nanosphere as photocatalyst, which provides a new opportunity for the remediation of environmental pollution. [ABSTRACT FROM AUTHOR]