The development of high-performance electrocatalysts is a highly efficient strategy to optimize the sluggish kinetic property of the oxygen evolution reaction (OER). Herein, we synthesize a kind of nickel foam (NF)-supported electrocatalyst composed of a one-dimensional Co3O4 nanowire as the core and a two-dimensional NiFe-LDH nanosheet as the shell (denoted as NiFe-60/Co3O4@NF). Fluorine is introduced into the precursor Co­(OH)­F of Co3O4, which results in improved thermal stability and significantly increased regularly distributed oxygen vacancies, while the electrochemically deposited NiFe-LDH nanosheets possess a crystalline/amorphous hybrid structure. As a result, the hetero-interface mainly constituting Ni species from NiFe-LDH and Co3O4 from Co­(OH)F contributes to the interaction between Co and Fe species and facilitates the electron transfer. Simultaneously, the interaction between oxygen vacancies in Co3O4 and coordinatively unsaturated Fe species in the amorphous area in NiFe-LDH is also determined, finally completing the electron backtracking. Benefiting from these factors, only low overpotentials of 221 and 257 mV are required to deliver the current densities of 100 and 500 mA cm–2, respectively, with a quite small Tafel slope of 34.6 mV dec–1 during OER for the well-designed NiFe-60/Co3O4@NF electrocatalyst.

MIL-125-NH–CH2OH@Ag@COF is constructed by an in situ auto-reduction strategy and subsequent coating with a COF. The conversion of benzylamine at 60 °C is nearly twice as high as that at 20 °C under visible light irradiation.

The unique characteristics of Metal-Organic Frameworks (MOFs) and Covalent-Organic Frameworks (COFs), such as structural tunability, high specific surface area, and highly organized pores, have led to their widespread applicationin catalysis....

Photocatalytic oxidation of raw organic molecules to value-added chemicals provides a cost-effective and sustainable strategy in organic synthesis. In this work, a series of Cu-doped MIL-125-NH 2 with narrower band gaps were synthesized by a one-pot hydrothermal method and used as photocatalysts for thermo-enhanced aerobic oxidative coupling of amines to imines under visible light irradiation. With optimal doping content, the conversion of benzylamine over MIL-125-NH 2 /Cu 2% can reach 100% at 60 °C under visible light irradiation for 8 h using molecule oxygen as oxidant. It is proved that doping MIL-125-NH 2 with a suitable Cu content can broaden the visible light absorption range, promote the separation of photo-induced charge carriers and improve the photocatalytic performance. Moreover, the increase of reaction temperature of the photocatalytic system promotes the performance. Free radical capture experiments and ESR tests show that holes and superoxide free radicals are the main active species. Such an excellent photocatalytic performance can be attributed to the strong light absorption and more efficient electron-hole separation efficiency via the Cu-doping strategy in MIL-125-NH 2 catalysts.

No abstract