Cascade Design and Facile Fabrication of Cu/CuO/CuAl-Layered Double Hydroxides as Efficient Nitrate Reduction Electrocatalysts.

Nitrate (NO¯) reduction reaction (NITRR) presents a promising pathway for the production of renewable NH while concurrently decontaminating NO¯ wastewater. However, the multi-electron transfer sequence and complex reaction network involved in NO¯ conversion pose significant challenges to achieving high Faradaic efficiency (FE). Herein, this work presents ternary Cu/CuO/CuAl-layered double hydroxides (LDHs) catalysts designed through a cascade approach and synthesized via a straightforward one-step electrodeposition method.

Highly Self-Healing Co/Ni Dual-Active Species for the Electrocatalytic Oxidation of 5-Hydroxymethylfurfural.

Electrocatalytic conversion of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) is significant for the sustainable production of value-added chemicals. Active sites of catalysts could enhance the activity and selectivity of the HMF oxidation reaction (HMFOR), but the self-healing ability of active sites has been commonly ignored. In this work, Co(OH)/Ni-MOF was successfully fabricated for efficient oxidation of HMF to FDCA under mild conditions.

Understanding the cascade heterojunction of CuPc/Bi-MOF for photoelectrochemical nitrate reduction.

Herein, a CuPc/Bi-MOF cascade heterojunction is synthesized exhibiting an excellent NH yield (7.13 μg h cm) and stability. Characterization studies show that the cascade heterostructure with a unique morphology and oxygen vacancies offers new insights into future photoelectrocatalytic material design.

Nitrate Reduction by NiFe-LDH/CeO: Understanding the Synergistic Effect between Dual-Metal Sites and Dual Adsorption.

Electrocatalytic nitrate reduction reaction (EC-NITRR) shows a significant advantage for green reuse of the nitrate (NO) pollutant. However, the slow diffusion reaction limits the reaction rate in practical EC-NITRR, causing an unsatisfactory ammonia (NH) yield. In this work, a multifunctional NiFe-LDH/CeO with the dual adsorption effect (physisorption and chemisorption) and dual-metal sites (Ce and Fe) was fabricated by the electrodeposition method.

Controllable evolution of NiOOH/Au active species for the oxidation of 5-hydroxymethylfurfural.

To induce the generation of active species at the metal-carrier interface, a new synthetic strategy was successfully developed to reconstruct the Ni MOF-Au electrochemical activation. This unique configuration not only obtained high-valence NiOOH-Au species, but also stably anchored the Au nanoparticles on the surface of the catalyst. As a result, nearly 99.

Strengthening the Stability of the Reconstructed NiOOH Phase for 5-Hydroxymethylfurfural Oxidation.

Electrochemical oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) is a promising approach to produce high-value chemicals such as 2,5-furandicarboxylic acid (FDCA). However, the undesirable stability of catalysts commonly limits its potential application value. In this work, NiOOH derived from Ni(OH) was determined as the main catalytic site for HMF oxidation, but the collapse of Ni(OH) caused severe instability during the electrocatalytic process because of the crystal structure mismatch between NiOOH and Ni(OH).

Construction of Frustrated Lewis Pair Sites in CeO-C/BiVO for Photoelectrochemical Nitrate Reduction.

Photoelectrochemical nitrate reduction reaction (PEC NIRR) could convert the harmful pollutant nitrate (NO) to high-value-added ammonia (NH) under mild conditions. However, the catalysts are currently hindered by the low catalytic activity and slow kinetics. Here, we reported a heterostructure composed of CeO and BiVO, and the "frustrated Lewis pairs (FLPs)" concept was introduced for understanding the role of Lewis acids and Lewis bases on PEC NIRR.

CeO/Ni-MOF with Synergistic Function of Enrichment and Activation: Efficient Reduction of 4-Nitrophenol Pollutant to 4-Aminophenol.

The conversion of organic pollutants to value-added chemicals has been considered as a sustainable approach to solve environmental problems. However, it is still a challenge to construct a suitable heterogeneous catalyst that can synchronously achieve the enrichment and activation of organic pollutants (such as 4-nitrophenol, 4-NP). Here, an organic-inorganic hybrid catalyst (CeO/Ni-MOF) was successfully fabricated for efficiently reducing 4-NP to 4-aminophenol (4-AP) with water as the hydrogen source.

Ag/Ni-MOF heterostructure with synergistic enrichment and activation properties for electrocatalytic reduction of 4-nitrophenol.

The synchronous optimization of adsorption and activity dominates the practical performance in electrocatalysis, so Ag/Ni-MOF/Ni foam was synthesized for expediting 4-nitrophenol (4-NP) reduction under mild and green conditions. The synergistic combination of selective adsorption (Ni-MOF) and sites (Ag) contributed to the excellent performance of 4-NP reduction. The 4-NP (25 mM) conversion and Faraday efficiency have been achieved up to 98.

In Situ Electrochemical Reconstitution of CF-CuO/CeO for Efficient Active Species Generation.

Achievement of the intrinsic activity by in situ electrochemical reconstruction has been becoming a great challenge for designing a catalyst. Herein, an effective electrochemical strategy is proposed to reconstruct the surface of the CF-CuO/CeO precursor. Under the stimulation of oxidative/reductive potential, abundant active sites were successfully generated on the surface of CF-CuO/CeO.

Electrocatalytic reduction of 4-nitrophenol over Ni-MOF/NF: understanding the self-enrichment effect of H-bonds.

The chemical adsorption and active sites play a key role in electrocatalysis, so Ni-MOF/nickel foam was fabricated for efficiently reducing 4-nitrophenol (4-NP) without any sacrificial agents. The coordinated water molecules induced the formation of hydrogen bonds (H-bonds) with the nitro group, contributing to the self-enrichment of 4-NP. The reaction rate reached 0.

Biothiol-Functionalized Cuprous Oxide Sensor for Dual-Mode Sensitive Hg Detection.

Hg ions are one of the highly poisonous heavy metal ions in the environment, so it is urgent to develop rapid and sensitive detection platforms for detecting Hg ions. In this work, a novel electrochemical and photoelectrochemical dual-mode sensor (l-Cys-CuO) was successfully fabricated, and the sensor exhibits a satisfactory detection limit (0.2 and 0.

Understanding the Z-scheme heterojunction of BiVO/PANI for photoelectrochemical nitrogen reduction.

Based on the idea that a heterojunction can significantly promote photoelectrochemical (PEC) efficiency, BiVO/PANI (polyaniline), as a Z-scheme heterojunction, was designed in this work. BiVO/PANI achieved a desirable NH yield rate ( = 0.93 μg h cm) and faradaic efficiency (FE = 26.

Charge-transfer dynamics at a Ag/Ni-MOF/CuO heterostructure in photoelectrochemical NH production.

Ag-decorated ultrathin Ni-MOF on CuO was fabricated for the first time. The charge-transfer dynamics at the heterostructure was studied by ultrafast transient absorption spectroscopy in depth. An NH yield rate of 4.

Boosted Photoelectrochemical N Reduction over MoC In Situ Coated with Graphitized Carbon.

Photoelectrochemical N reduction reaction (PEC NRR) is a promising method to solve the problems of environmental protection and energy sustainability. However, the strong chemical stability of the N≡N bond and competitive hydrogen evolution reaction (HER) cause the nonideal efficiency of N → NH conversion in actual operation. For the first time, a MoC/C heterostructure was fabricated as a PEC cathode for N reduction under environmental conditions.

Amorphous MnCO/C Double Layers Decorated on BiVO Photoelectrodes to Boost Nitrogen Reduction.

NH is mainly obtained by the Haber-Bosch method in the process of industrial production, which is not only accompanied by huge energy consumption but also environmental pollution. The reduction of N to NH under mild conditions is an important breakthrough to solve the current energy and environmental problems, so the preparation of catalysts that can effectively promote the reduction of N is a crucial step. In this work, BiVO decorated with amorphous MnCO/C double layers has been successfully synthesized by a one-step method for the first time.

Ag-Pi/BiVO heterojunction with efficient interface carrier transport for photoelectrochemical water splitting.

The limitation of pristine BiVO photoanode severely causes the high carrier recombination efficiency and low energy conversion efficiency in the photoelectrochemical (PEC) system. In this work, the Ag-Pi/BiVOn-n heterojunction has been rationally designed and fabricated for efficient PEC water splitting, through successive ionic layer adsorption reaction method. The built-in field of Ag-Pi/BiVO significantly promotes the separation efficiency of photogenerated carriers, benefiting for the participation of abundant holes in water oxidation.

Core-shell structured ZnCoO@ZnWO nanowire arrays on nickel foam for advanced asymmetric supercapacitors.

One of the most effective tactics to promote the electrochemical performance of supercapacitors is to design and synthesize hybrid binder-free electrodes with core-shell structures. In this work, hierarchical ZnCoO@ZnWO core-shell nanowire arrays grown on nickel foam are successfully fabricated via a facile two-step hydrothermal route and subsequent thermal treatment. The ZnCoO nanowire arrays supported on nickel foam serve as the backbone for anchoring ZnWO nanosheets.

Stable iridium dinuclear heterogeneous catalysts supported on metal-oxide substrate for solar water oxidation.

Atomically dispersed catalysts refer to substrate-supported heterogeneous catalysts featuring one or a few active metal atoms that are separated from one another. They represent an important class of materials ranging from single-atom catalysts (SACs) and nanoparticles (NPs). While SACs and NPs have been extensively reported, catalysts featuring a few atoms with well-defined structures are poorly studied.

Fabrication of MgFe2O4/MoS2 Heterostructure Nanowires for Photoelectrochemical Catalysis.

A novel one-dimensional MgFe2O4/MoS2 heterostructure has been successfully designed and fabricated. The bare MgFe2O4 was obtained as uniform nanowires through electrospinning, and MoS2 thin film appeared on the surface of MgFe2O4 after further chemical vapor deposition. The structure of the MgFe2O4/MoS2 heterostructure was systematic investigated by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectrometry (XPS), and Raman spectra.

Influence of anionic sulfonate-containing and nitrogen-containing mixed-ligands on the structures of silver coordination polymers.

In this article, a series of mixed-ligand Ag(i) coordination polymers, namely, Ag(L1)H(2)O (), Ag(2)(hmt)(2)(L1)(2) (), [Ag(HL2)]H(2)O (), [Ag(L2)(biim)][Ag(biim)] (), [K(5)(L3)(2)][Ag(H(2)O)(2)] (), [Ag(2)(L3)(3-iso)][Ag(3-iso)]5H(2)O (), [Ag(3)(L3)(bipy)(3)(H(2)O)]6H(2)O (), [Ag(3)(L3)(biim)(3)]H(2)O (), and [Ag(3)(L3)(hmt)(2)(H(2)O)(3)]H(2)O () (where hmt = hexamethylenetetramine, bipy = 4,4'-bipyridine, biim = 1,1'-(1,4-butanediyl)-bis(imidazole), 3-iso = 3-methylisoquinoline, L1 = 2,5-dichloro-4-amino-benzenesulfonate anion, L2 = 2-nitroso-1-naphthol-4-sulfonate anion and L3 = 4-hydroxy-5-nitro-1,3-benzenedisulfonate anion), have been synthesized by varying the anionic sulfonate-containing ligands and nitrogen-containing secondary ligands. Compounds and were synthesized through their parent compounds and , respectively, while were obtained by their parent compound . Ag(i) centers of are linked by L1 anions to generate a 1D polymeric chain, while Ag(i) centers of are bridged by hmt ligands to form a 2D polymeric layer.

N,N'-Bis(2-hydroxy-ethyl)-N,N'-[ethyl-ene-dioxy-bis(o-phenyl-enemethyl-ene)]-diammonium fumarate tetra-hydrate.

The reaction of 1,2-bis-{2-[(2-hydroxy-ethyl)amino-methyl]-phen-oxy}ethane and fumaric acid in a mixed solution in ethanol-water (1:1 v/v) yields the title compound, C(20)H(30)N(2)O(4) (2+)·C(4)H(2)O(4) (2-)·4H(2)O. In the crystal structure, the anions, cations and water mol-ecules are connected via O-H⋯O and N-H⋯O hydrogen bonds into a three-dimensional network. The fumarate anion and the N,N'-bis-(2-hydroxy-ethyl)-N,N'-[ethyl-enedioxy-bis(o-phenyl-enemethylene)]diammonium cation are located on centers of inversion, whereas the two crystallographically independent water mol-ecules occupy general positions.

1,8,16,23-Tetra-kis(2-cyano-benz-yl)bis-p-xylylbis-m-xylyldiamine.

The title compound {systematic name: 2,2',2'',2'''-[3,7,11,15-tetra-aza-1(1,4),5(1,3),9(1,4),13(1,3)-tetra-benzena-cyclo-hexadeca-phane-3,7,11,15-tetra-yltetra-methyl-ene]tetra-benzonitrile}, C(64)H(56)N(8), is a centrosymmetric macrocycle that is consolidated into the crystal structure by C-H⋯π inter-actions.