Developing a simple, rapid, and accurate sensing platform to detect tyramine (Tyr), an indicator of food spoilage, is tremendously significant for food safety and human health. Here, two novel isostructural...

Lanthanide-MOFs based Host-guest Intelligent Dual-Stimulus Response Platform for Naked-eye and Ratiometric Fluorescent Monitoring of Food Freshness

Cost-effective heteroatom-doped porous carbons are considered promising electrocatalysts for CO2 reduction reaction (CO2RR). Traditionally porous carbons with N doping or N/X codoping (X denotes the second type of heteroatom) have been widely studied, leaving ternary doping a much less studied yet exciting topic to be explored. Herein, a series of electrocatalysts based on metal-free Se, B, and N ternary-doped porous carbons (termed “SeBN-Cs”) were synthesized and tested as metal-free electrocatalysts in CO2RR. Our study indicates that the major product of CO2RR on the SeBN-C electrocatalysts was CO with a small fraction (<5%) of H2 as the byproduct. The optimal electrocatalyst sample SeBN-C-1100 prepared at 1100 °C exhibits a high CO selectivity with a Faradaic efficiency of CO reaching 95.2%. After 10 h of continuous electrolysis operation, the Faradaic efficiency and the current density are maintained high at 97.6 and 84.7% of the initial values, respectively, indicative of a long-term operational stability. This study provides an excellent reference to deepen our understanding of the properties and functions of multi-heteroatom-doped porous carbon electrocatalysts in CO2RR.

Metal-Free SeBN Ternary-Doped Porous Carbon as Efficient Electrocatalysts for CO2 Reduction Reaction

Industrial bioelectrochemistry for waste valorization: State of the art and challenges.

The design of high-performance luminescent MOF thermometers with multi-operation modes has been long sought but remains a formidable challenge. In this work, for the first time, we present a multimodal luminescent ratiometric thermometer based on the single-lanthanide metal-organic framework (MOF) DyTPTC-2Me (H4TPTC-2Me = 2',5'-dimethyl-[1,1':4',1″-terphenyl]-3,3″,5,5″-tetracarboxylic acid). It not only has the characteristic luminescence of Dy3+ in which the atomic transitions from the 4I15/2 and 4F9/2 states (thermally coupled energy levels, TCELs) are included but also emits ligand fluorescence due to the efficient energy back-transfer of Dy3+ to the ligand, thus allowing accurate non-invasive determination of temperature by different modes. In particular, the TCEL-based emissions of the Dy3+ ions give ideal signals for measuring the temperature in the 303-423 K range. The emissions of the ligand and Dy3+ (4F9/2 → 6H13/2) are used for temperature sensing in the range of 423 to 503 K. Both two modes feature promising thermometric performance, including high relative sensitivity, high temperature resolution, and excellent repeatability. Their combination is thus beneficial to achieve more accurate temperature detection over a broad temperature range, which can broaden the application scope of the ratiometric luminescent thermometers.

A Multimodal Ratiometric Luminescent Thermometer Based on a Single-Dysprosium Metal-Organic Framework.

Achieving decarbonization through zero net CO2 emissions requires commercially viable application of waste CO2, throughout the transition to renewable and low‐carbon energy sources. A promising approach is the electrochemical carbon dioxide reduction reaction (CO2RR), which when powered with renewable electricity sources, provides a pathway for the conversion of intermittent renewable energy and waste CO2 into value‐added chemicals and fuels. However, as CO2RR is accompanied by the competing hydrogen evolution reaction (HER) due to the presence of water, an opportunity is presented to generate a mixture of CO and H2, also known as synthesis gas or syngas – the building block of various oxy‐hydrocarbon products. The aim of this review is to analyze both Power‐to‐CO and Power‐to‐Syngas studies, in order to classify and discuss the active sites for both CO and H2 generation through a new lens, providing insights into the structure‐activity correlations and facilitating the design of more active syngas electrocatalysts in the future. Through an evaluation of the economic viability of syngas generation, we determine that the carbon capture cost is a key parameter, with improvements in catalyst activity, catalyst impurity tolerance, and electrolyzer technology necessary for significant improvement in the economics of electrocatalytic syngas generation.

https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/cctc.202200981

Renewable Power for Electrocatalytic Generation of Syngas: Tuning the Syngas Ratio by Manipulating the Active Sites and System Design

Luminescent stability is a vital factor that dictates the application of lanthanide luminescent materials. Designing luminescent lanthanide cluster nodes that form an extended framework with predictable linking patterns may help enhance the structural stability of the lanthanide complexes and hence lead to improved luminescent stability. Herein, we report a series of one-dimensional (1D) rare-earth metal-organic framework compounds, {Ln4(μ4-OH)(TC4A)2(H2O)2(CH3O)(HCOO)2(HCOOH)}·xCH3OH (Ln = Sm (1), Eu (2), Tb (3), Dy (4); x = 1-5), based on double thiacalix[4]arene-capped Ln4(μ4-OH)(TC4A)2 nodes. The axially capped Ln4(μ4-OH)(TC4A)2 nodes are connected equatorially by formate bridges to form zigzag 1D-metal-organic framework (MOF) chains, which further assemble into a quasi-two-dimensional (2D) structure via hydrogen bonding. These unique features result in a stable structure and therefore superior luminescent stability. For example, the Tb-based 1D-MOF (3) exhibits intensive green photoluminescence with a quantum yield of 53% and an average decay time of 1.33 × 106 ns. It maintains its integrated emission intensity at 96.5, 94.5, and 89.4% of the original value after being exposed to moisture (soaking in water for 10 days), elevated temperature (150 °C), and UV (15 days of continuous radiation), respectively, demonstrating excellent luminescent stability. We adopt the Tb-based 1D-MOF (3) as the green phosphor and successfully fabricate a prototype white-light-emitting diode (LED) with stable emission under long-term operation. Our synthetic strategy allows control over the linking pattern of lanthanide nodes, providing a predictive route to obtain lanthanide MOFs with improved luminescent stability.

Ultrastable Photoluminescence Enabled by 1D Rare-Earth Metal-Organic Frameworks Based on Double Thiacalix[4]arene-Capped Nodes.

The preparation of high-value fuels and chemicals through the electrochemical carbon dioxide reduction reaction (CDRR) is of great significance to the virtuous cycle of carbon dioxide. However, due to the high overpotential involved in this reaction, high power consumption and high-cost noble-metal-based catalysts are required for driving this process. Herein, the electrochemical CDRR was achieved on biocompatible metal-free nitrogen, phosphorus co-doped carbon-based materials (NP-C) in the microbial fuel cell-microbial electrolysis cell (MFC-MEC) coupling system. As the bioelectrochemistry in MFC supplied power to drive the electrocatalysis in MEC, syngas was spontaneously produced from this coupling system without external energy input. With the NP-C materials as the excellent bifunctional electrocatalyst for the CDRR and oxygen reduction reaction (ORR), the current density of the MEC reached −0.52 mA cm−2, and the Faradaic efficiencies (FEs) of CO and H2 were 60% and 40%, respectively, at a load resistance of 10 Ω. Moreover, the CO/H2 product ratio can be changed by adjusting the load resistance, which will widely meet various demand of syngas usage in further reactions. This study provides a spontaneous and tunable production of syngas in biogas digesters via a electrochemical strategy.

/pdf/spontaneously-producing-syngas-from-mfc-mec-coupling-system-575ykggnj9.pdf

Spontaneously producing syngas from MFC-MEC coupling system based on biocompatible bifunctional metal-free electrocatalyst

Antibacterial nanoagents with broad-spectrum antibacterial activities have emerged as an evolution of antibiotics. However, their bacteria-capturing capability and bacteria-killing efficiency remain insufficient for commercial implementation. Inspired by the hunting behavior of spiders, here, a novel spiderweb-like nanoagent based on silver-adenine nanowires is designed to achieve high-efficiency capture and killing of bacteria. By virtue of the initiative bacteria-capturing functionality, this spiderweb-like nanoagent could effectively attract and trap bacteria through electrostatic interaction and its reticular morphology feature. Furthermore, its synergetic antibacterial mechanism combining physical membranolysis with reactive oxygen species (ROS) release allows such nanoagent to harvest a promoted bactericidal activity. Importantly, the woundplast employing the spiderweb-like nanoagent exhibits a superior antibacterial efficacy against drug-resistant Gram-negative Escherichia coli and Gram-positive methicillin-resistant Staphylococcus aureus compared with commercially available woundplasts. This work may pave a new way for rational design of new generation bactericidal agents facing the future super-bacteria booming.

/pdf/bioinspired-nanostructured-spiderweb-for-high-efficiency-145d4si5t2.pdf

Bioinspired nanostructured spiderweb for high-efficiency capturing and killing of bacteria

Due to the challenge of finding adequate structures for the catalytic activity assessment of various staples in metal nanoclusters, a fast‐oxidation method is introduced to obtain a kinetics‐controlled metal nanocluster Au24(CHT)18 with modified structure of the previously reported Au24(SR)20 (SR: thiolate). It is found that the staple catalysis activity is affected by the kernel, transforming the catalysis selectivity from H2 evolution to CO production [H2 Faradaic efficiency: ≈100% for Au24(SR)20 at −0.8 V versus CO Faradaic efficiency: 91% for Au24(SR)18], and the staple catalysis activity order is tetramer > monomer > dimer, which is further confirmed by comparing the catalysis performance between Au24(CHT)18 and Au18(CHT)14. Thus, the kernel influence on the staple catalysis and the staple activity order in catalysis is revealed, and with essential implications provided for metal nanocluster synthesis, structure tailoring, and structure–property correlation. The additional photoluminescence endows the as‐prepared nanoclusters potential for more practical applications.

Electrochemical Carbon Dioxide Reduction Reaction or Hydrogen Evolution Reaction: Kernel and Type‐Dependent Catalytic Activity of Staples in Metal Nanoclusters

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Ultrastable Photoluminescence Enabled by 1D Rare-Earth Metal-Organic Frameworks Based on Double Thiacalix[4]arene-Capped Nodes.

Spontaneously producing syngas from MFC-MEC coupling system based on biocompatible bifunctional metal-free electrocatalyst

Bioinspired nanostructured spiderweb for high-efficiency capturing and killing of bacteria

Electrochemical Carbon Dioxide Reduction Reaction or Hydrogen Evolution Reaction: Kernel and Type‐Dependent Catalytic Activity of Staples in Metal Nanoclusters