Metal-organic framework-derived Cu nanoparticle binder-free monolithic electrodes with multiple support structures for electrocatalytic nitrate reduction to ammonia.

Electrocatalytic nitrate reduction to ammonia, which removes nitrates from aquatic ecosystems, is a potential alternative to the classical Haber-Bosch process. Nevertheless, the selectivity of ammonia is often affected by the toxic by-product nitrite. Here, the polyhedral-supported Cu nanoparticle binder-free monolithic electrode (Cu-BTC-Cu) is synthesized by the electroreduction of Cu metal-organic framework (Cu-MOF) precursors.

Boron-doped graphene quantum dot/bismuth molybdate composite photocatalysts for efficient photocatalytic nitrogen fixation reactions.

Bismuth molybdate (BMO) is a promising visible-driven photocatalyst and constructing heterojunctions in BMO-based materials is an effective way to enhance photocatalytic performance. In this study, boron-doped graphene quantum dots (BGQDs) were synthesized by one-step pyrolysis and carbonization, followed by the preparation of bismuth molybdate/boron-doped graphene quantum dots (BGQDs/BMO) heterojunction photocatalysts using in-situ growth method. The introduction of BGQDs significantly improved the photocatalytic nitrogen fixation activity under the irradiation of visible light and without scavengers.

Microchemical environmental regulation of POMs@MIL-101(Cr) promote photocatalytic nitrogen to ammonia.

The polyoxometalates (POMs) have been shown to be highly effective as reactive sites for photocatalytic nitrogen fixation reactions. However, the effect of POMs regulation on catalytic performance has not been reported yet. Herein, a series of composites (SiWM@MIL-101(Cr) (M = Fe, Co, V, Mo) and D-SiWMo@MIL-101(Cr), D, Disordered) were obtained by regulating transition metal compositions and arrangement in the POMs.

MOFs-derived plum-blossom-like junction In/InO@C as an efficient nitrogen fixation photocatalyst: Insight into the active site of the In around oxygen vacancy.

Nitrogen activation with low-cost, visible-light-driven photocatalysts continues to be a major challenge. Since the discovery of biological nitrogen fixation, multi-component systems have achieved higher efficiency due to the synergistic effects, thus one of the challenges has been distinguishing the active sites in multi-component catalysts. In this study, we report the photocatalysts of In/InO@C with plume-blossom-like junction structure obtained by one-step roasting of MIL-68-In.

Cationic vacancy engineering of p-TiO for enhanced photocatalytic nitrogen fixation.

Defect engineering is one of the effective strategies to regulate and control catalyst properties. Constructing appropriate catalytically active centers effectively tunes the electronic and surface properties of the catalyst to achieve further enrichment of photogenerated electrons, enhances the electronic feedback of the catalytically active center to the anti-bonding orbitals of the nitrogen molecule, and enhances N adsorption while weakening the NN bond. In this study, titanium vacancy (V)-rich undoped anatase p-TiO was successfully synthesized to investigate the effect of its metal vacancies on photocatalytic nitrogen reduction reaction (NRR) performance.

Keggin-type SiW encapsulated in MIL-101(Cr) as efficient heterogeneous photocatalysts for nitrogen fixation reaction.

The incorporation of polyoxometalates (POMs) in metal-organic frameworks (MOFs) with host-guest structure have proven to be effective strategy to rational design of heterogeneous catalysis. In this study, the Keggin-type POM@MIL-101(Cr) composite catalysts (PMo, PW and SiW) are synthesized for nitrogen fixation reaction without sacrificial agents at room temperature in the first time. The SiW molecules are encapsulated in smaller cavities of MIL-101(Cr) by solvothermal method and in larger cavities by impregnation method, respectively.

Hydrated lithium ions intercalated VO with dual-ion synergistic insertion mechanism for high-performance aqueous zinc-ion batteries.

LiVO·0.89HO (LVO) was successfully synthesized by wet-mixing of LiOH·HO and VO, with subsequent hydrothermal method for the first time. The hydrated lithium ions as the intercalated guest species were inserted into the VO interlayer.

Dy single-molecule magnets from ligands incorporating both amine and acylhydrazine Schiff base groups: the centrosymmetric {Dy} displaying dual magnetic relaxation behaviors.

The novel multidentate chelating ligands N'-(2-pyridylmethylidene)-2-(2-pyridylmethylideneamino)benzohydrazide (Hpphz) and N'-(2-salicylmethylidene)-2-(2-salicylmethylideneamino)benzohydrazide (Hsshz), which incorporate both amine and acylhydrazine Schiff base groups, were synthesized and investigated in Dy coordination chemistry. The reactions of Hpphz and Dy(OAc)·4HO have yielded two {Dy} featuring double OAc bridges: [Dy(Haphz)(OAc)(ROH)] [R = Me (1) and Et (2)], where the Hpphz ligands were in situ hydrolyzed into 2-amino-(2-pyridylmethylideneamino)benzohydrazide ions (Haphz). Besides, the reaction between Hsshz and Dy(NO)·6HO afforded a [Dy(sshz)(μ-OH)(μ-O)(MeOH)]·17.