The electrochemical detection of hydrogen peroxide (H2O2) has become more and more important in industrial production, daily life, biological process, green energy chemistry, and other fields (especially for the detection of low concentration of H2O2). Metal organic frameworks (MOFs) are promising candidates to replace the established H2O2 sensors based on precious metals or enzymes. This review summarizes recent advances in MOF-based H2O2 electrochemical sensors, including conductive MOFs, MOFs with chemical modifications, MOFs-composites, and MOF derivatives. Finally, the challenges and prospects for the optimization and design of H2O2 electrochemical sensors with ultra-low detection limit and long-life are presented.

/pdf/metal-organic-frameworks-for-electrocatalytic-sensing-of-25u637se.pdf

Metal–Organic Frameworks for Electrocatalytic Sensing of Hydrogen Peroxide

The exploration of antilaser damage wide bandgap infrared (IR) nonlinear optical (NLO) materials is urgent but challenging. Herein, by introducing the idea of fluorination into chalcogenides, a wide bandgap IR NLO material Na3SiS3F with unprecedented [SiS3F] tetrahedra is designed and synthesized. Na3SiS3F shows a wide bandgap of 4.75 eV (the largest one in the reported quaternary metal chalcogenides), resulting in a high laser damage induced threshold of ≈5 × AgGaS2 (AGS). Meanwhile, the compound has a moderate NLO response (≈0.3 ×AGS) with phase-matching behavior, large birefringence ([email protected] nm), and wide IR transparent region. The introduction of fluorine breaks the structural symmetry and broadens the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gap, polarizability anisotropy, and hyperpolarizability of the Si–S tetrahedral unit. The results indicate that Na3SiS3F is a promising IR NLO material for the high-power laser application and open an avenue for the design of new wide bandgap IR NLO materials based on NLO-active [SiSiF4−x] (x = 1, 2, 3) mixed anionic tetrahedral group. 

Na
 3
 SiS
 3
 F: A Wide Bandgap Fluorothiosilicate with Unique [SiS
 3
 F] Unit and High Laser‐Induced Damage Threshold

Sensors, the underlying technology that supports the Internet of Things, are undergoing multi-disciplinary integration development to constantly improve the efficiency of human production and life. Simultaneously, the application scenarios in emerging fields such as medical diagnosis, environmental monitoring and industrial safety put forward higher requirements for sensing capabilities. Over the last decade, single-atom catalysts (SACs) have attracted tremendous attention in fields such as environment and energy due to their high atom utilization efficiencies, controllable active sites, tailorable coordination environments and structural/chemical stability. These extraordinary characteristics extend the sensitivity and selectivity of sensors beyond their current limitations. Here, we start with the working principles of SAC-based sensors, and summarize the relationship between sensor performance and intrinsic properties of SACs, followed by an overview of the design strategy development. We then review the recent advances in SAC-based sensors in different fields and highlight the future opportunities and challenges in their exciting applications.

Single-atom catalysts: promotors of highly sensitive and selective sensors.

The preparation of N-doped carbon with well-defined and well-controlled doping of N species is a challenging work, especially with supported Pt atoms. Here, four kinds of N-doped carbons with well-controlled N species were synthesized using Friedel–Crafts reaction or thermal pyrolysis. It was found that the strong interaction between Pt and N in C–N═C and bridged −NH at the edge of heptazine rings in g-C3N4 improved the performance of Pt/g-C3N4 for nitrobenzene hydrogenation. The calculated turnover frequency of each Pt atom in Pt/g-C3N4 reached 42,865 h–1 at 50 °C, and it was stable for five cycles without agglomeration or leaching of Pt species. These findings provide a promising way for the rational design of the hydrogenation catalysts and the development of well-controlled N-doped carbon materials. 

Structure–Activity Relationship for the Catalytic Hydrogenation of Nitrobenzene by Single Platinum Atoms Supported on Nitrogen-Doped Carbon

The first examples of silver fluorotellurites, namely, AgTeO2F and Ag2(TeO2F2), as well as the first silver tellurite fluoride, Ag3F3(TeF6)(TeO2)12, have been obtained successfully under mild hydrothermal conditions. AgTeO2F displays a...

From AgTeO2F, Ag2(TeO2F2) to Ag3F3(TeF6)(TeO2)12: First Silver Tellurite Oxyfluorides with Linear and Nonlinear Optical Property

Two new tellurite halides, CdPb2Te3O8Cl2 and Cd13Pb8Te14O42Cl14 with mixed cationic layered structures, have been synthesized by high-temperature solution method. CdPb2Te3O8Cl2 crystallizes in the noncentrosymmetric Aba2 space group, built by [CdPb2Te3O8]...

Two New Tellurite Halides with Cationic Layers: Syntheses, Structures, and Characterizations of CdPb2Te3O8Cl2 and Cd13Pb8Te14O42Cl14

A Ga-enriched ternary alkali-metal sulfide Na4Ga8S14 has been synthesized by a high temperature solid-state reaction. It crystallizes in the centrosymmetric Pbca (no. 61) space group with cell parameters a = 13.5260(4) Å, b = 11.4979(3) Å, c = 29.9592(9) Å, and Z = 8, and exhibits a three-dimensional (3D) network structure constructed from unique [Ga12S42] 12-membered rings, one-dimensional ∞[Ga4S11] chains, individual [GaS4] units and Na+ ions. The experimental band gap of Na4Ga8S14 was measured as ∼3.57 eV. Theoretical calculations indicate that the title compound is a direct band gap compound and the band gap is mainly determined by [GaS4] units. Meanwhile, statistical analysis shows that the atomic ratio N (N = AIAII/Ga, where AI = alkali-metal, AII = alkaline earth-metal) can be used to regulate the connection of [GaS4] units from zero-dimensional (0D) isolated groups, one-dimensional (1D) chains, and two-dimensional (2D) layers to 3D frameworks in Ga-containing alkali- and/or alkaline earth-metal chalcogenides. The results enrich the diversity of alkali-metal sulfides and give an insight into the structural regulation of alkali- and/or alkaline earth-metal chalcogenides.

Na4Ga8S14: a Ga-enriched wide band gap ternary alkali-metal sulfide with unique [Ga12S42] 12-membered rings.

Stable and highly sensitive determination of hydrogen peroxide (H2O2) is needed in various fields ranging from disease prevention to environmental protection. The construction of inexpensive and highly active transition-metal-based nitrogen-doped...

Tailoring Atomically Dispersed Cobalt-Nitrogen Active Sites in Wrinkled Carbon Nanosheets via “Fence” Isolation for Highly Sensitive Detection of Hydrogen Peroxide

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Two New Tellurite Halides with Cationic Layers: Syntheses, Structures, and Characterizations of CdPb2Te3O8Cl2 and Cd13Pb8Te14O42Cl14

Na4Ga8S14: a Ga-enriched wide band gap ternary alkali-metal sulfide with unique [Ga12S42] 12-membered rings.

Tailoring Atomically Dispersed Cobalt-Nitrogen Active Sites in Wrinkled Carbon Nanosheets via “Fence” Isolation for Highly Sensitive Detection of Hydrogen Peroxide