Red Emissive Carbon Dot Superoxide Dismutase Nanozyme for Bioimaging and Ameliorating Acute Lung Injury

Advanced Functional Materials, Год журнала: 2023, Номер 33(19)

Опубликована: Янв. 29, 2023

Abstract Harnessing the physiochemical properties and enzymatic activities of nanozymes will provide new insights for disease theranostics. Herein, a novel carbon dot (C‐dot) superoxide dismutase (SOD) nanozyme that exhibits red fluorescence with emission wavelength 683 nm shows high SOD‐like activity >4000 U mg −1 is reported, which presents great potential imaging biodistribution itself in vivo ameliorating acute lung injury. Through surface modifications, mechanism C‐dot SOD revealed to be relied on their functional groups bind radicals, promote electron transfer between C‐dots finally accelerate dismutation radicals. The absolute quantum yield ≈14% endow it bioimaging vitro vivo. Moreover, effectively enters cells, accumulates at mitochondria, protects living cells from oxidative damage by scavenging reactive oxygen species (ROS) reducing levels pro‐inflammatory factors. Importantly, animal experiments demonstrate accumulation injure therapeutic effect toward injury mice. fluorescent management ROS‐related diseases.

Язык: Английский

---

Lattice‐Strain Engineering for Heterogenous Electrocatalytic Oxygen Evolution Reaction

Advanced Materials, Год журнала: 2023, Номер 35(39)

Опубликована: Янв. 14, 2023

Abstract The energy efficiency of metal–air batteries and water‐splitting techniques is severely constrained by multiple electronic transfers in the heterogenous oxygen evolution reaction (OER), high overpotential induced sluggish kinetics has become an uppermost scientific challenge. Numerous attempts are devoted to enabling activity, selectivity, stability via tailoring surface physicochemical properties nanocatalysts. Lattice‐strain engineering as a cutting‐edge method for tuning geometric configuration metal sites plays pivotal role regulating interaction catalytic surfaces with adsorbate molecules. By defining d‐band center descriptor structure–activity relationship, individual contribution strain effects within state‐of‐the‐art electrocatalysts can be systematically elucidated OER optimization mechanism. In this review, fundamentals advancements strain‐catalysts showcased innovative trigger strategies enumerated, particular emphasis on feedback mechanism between precise regulation lattice‐strain optimal activity. Subsequently, modulation various attributes categorized impediments encountered practicalization strained effect discussed, ending outlook future research directions burgeoning field.

Язык: Английский

---

Tensile Strain-Mediated Spinel Ferrites Enable Superior Oxygen Evolution Activity

Journal of the American Chemical Society, Год журнала: 2023, Номер 145(44), С. 24218 - 24229

Опубликована: Окт. 24, 2023

Exploring efficient strategies to overcome the performance constraints of oxygen evolution reaction (OER) electrocatalysts is vital for electrocatalytic applications such as H2O splitting, CO2 reduction, N2 etc. Herein, tunable, wide-range strain engineering spinel oxides, NiFe2O4, proposed enhance OER activity. The lattice regulated by interfacial thermal mismatch during bonding process between thermally expanding NiFe2O4 nanoparticles and nonexpanding carbon fiber substrate. tensile causes energy bands flatten near Fermi level, lowering eg orbital occupancy, effectively increasing number electronic states reducing pseudoenergy gap. Consequently, barrier rate-determining step strained reduced, achieving a low overpotential 180 mV at 10 mA/cm2. A total water decomposition voltage range 1.52-1.56 V mA/cm2 (without iR correction) was achieved in an asymmetric alkaline electrolytic cell with nanoparticles, its robust stability verified retention approximately 99.4% after 100 h. Furthermore, current work demonstrates universality tuning other ferrite systems, including cobalt, manganese, zinc ferrites.

Язык: Английский

---

Recent Progress in Strain Engineering on Van der Waals 2D Materials: Tunable Electrical, Electrochemical, Magnetic, and Optical Properties

Advanced Materials, Год журнала: 2022, Номер 35(12)

Опубликована: Авг. 11, 2022

Strain engineering is a promising way to tune the electrical, electrochemical, magnetic, and optical properties of 2D materials, with potential achieve high-performance 2D-material-based devices ultimately. This review discusses experimental theoretical results from recent advances in strain materials. Some novel methods induce are summarized then tunable electrical optical/optoelectronic materials via highlighted, including particularly previously less-discussed tuning superconducting, electrochemical properties. Also, future perspectives given for its applications functional devices. The state survey presents ever-increasing advantages popularity Suggestions insights further research optical, electronic, spintronic provided.

Язык: Английский

---

Electronic structure engineering for electrochemical water oxidation

Journal of Materials Chemistry A, Год журнала: 2022, Номер 10(38), С. 20218 - 20241

Опубликована: Янв. 1, 2022

Strategies for regulating the electronic structure of transition-metal-based electrocatalysts through doping, heterostructure, oxygen vacancies, alloy, and strain engineering are investigated.

Язык: Английский

---

Unlocking the Transition of Electrochemical Water Oxidation Mechanism Induced by Heteroatom Doping

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(40)

Опубликована: Авг. 15, 2023

Abstract Heteroatom doping has emerged as a highly effective strategy to enhance the activity of metal‐based electrocatalysts toward oxygen evolution reaction (OER). It is widely accepted that does not switch OER mechanism from adsorbate (AEM) lattice‐oxygen‐mediated (LOM), and enhanced attributed optimized binding energies intermediates. However, this seems inconsistent with fact overpotential doped (<300 mV) considerably smaller than limit AEM (>370 mV). To determine origin inconsistency, we select phosphorus (P)‐doped nickel‐iron mixed oxides model observe enhances covalency metal‐oxygen bonds drive pathway transition LOM, thereby breaking adsorption linear relation between *OH *OOH in AEM. Consequently, obtained P‐doped display small 237 mV at 10 mA cm −2 . Beyond P, similar also observed on sulfur doping. These findings offer new insights into substantially originating heteroatom

Язык: Английский

---

Tailoring of Active Sites from Single to Dual Atom Sites for Highly Efficient Electrocatalysis

ACS Nano, Год журнала: 2022, Номер 16(11), С. 17572 - 17592

Опубликована: Ноя. 4, 2022

Single atom catalysts (SACs) have been attracting extensive attention in electrocatalysis because of their unusual structure and extreme utilization, but the low metal loading unified single site induced scaling relations may limit activity practical application. Tailoring active sites at atomic level is a sensible approach to break existing limits SACs. In this review, SACs were first discussed regarding carbon or non-carbon supports. Then, five tailoring strategies elaborated toward improving electrocatalytic SACs, namely strain engineering, spin-state tuning axial functionalization ligand porosity so as optimize electronic state sites, tune d orbitals transition metals, adjust adsorption strength intermediates, enhance electron transfer, elevate mass transport efficiency. Afterward, from angle inducing redistribution optimizing nature centers, synergistic effect adjacent atoms recent advances on with binuclear configuration which include simple, homonuclear, heteronuclear dual (DACs) summarized. Finally, summary some perspectives for achieving efficient sustainable presented based strategies, design situ characterization.

Язык: Английский

---

Synergistic effects of mixing and strain in high entropy spinel oxides for oxygen evolution reaction

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Сен. 23, 2023

Developing stable and efficient electrocatalysts is vital for boosting oxygen evolution reaction (OER) rates in sustainable hydrogen production. High-entropy oxides (HEOs) consist of five or more metal cations, providing opportunities to tune their catalytic properties toward high OER efficiency. This work combines theoretical experimental studies scrutinize the activity stability spinel-type HEOs. Density functional theory confirms that randomly mixed sites show thermodynamic stability, with intermediate adsorption energies displaying wider distributions due mixing-induced equatorial strain active metal-oxygen bonds. The rapid sol-flame method employed synthesize HEO, comprising 3d-transition which exhibits superior durability under alkaline conditions, outperforming lower-entropy oxides, even partial surface oxidations. study highlights enhanced HEO primarily attributed mixing multiple elements, leading effects near site, as well composition coverage.

Язык: Английский

---

General Bottom-Up Colloidal Synthesis of Nano-Monolayer Transition-Metal Dichalcogenides with High 1T′-Phase Purity

Journal of the American Chemical Society, Год журнала: 2022, Номер 144(11), С. 4863 - 4873

Опубликована: Март 8, 2022

Phase engineering of nanomaterials provides a promising way to explore the phase-dependent physicochemical properties and various applications nanomaterials. A general bottom-up synthesis method under mild conditions has always been challenging globally for preparation semimetallic phase-transition-metal dichalcogenide (1T'-TMD) monolayers, which are pursued owing their unique electrochemical property, unavailable in semiconducting 2H phases. Here, we report scalable colloidal nanosized 1T'-TMD including 1T'-MoS2, 1T'-MoSe2, 1T'-WS2, 1T'-WSe2, revealed be high phase purity. Moreover, surfactant-reliant stacking-hinderable growth mechanism nano-monolayers was unveiled through systematic experiments theoretical calculations. As proof-of-concept application, used electrocatalytic hydrogen production an acidic medium. The 1T'-MoS2 possess abundant in-plane active sites conductivity, coupled with contribution lattice strain, thus exhibiting excellent performance. Importantly, catalyst shows impressive endurability electroactivity. Our developed strategy could pave extend other broad metastable semimetallic-phase TMDs, offer great potential novel crystal wide application development catalysis beyond.

Язык: Английский

---

Recent advances in Ru-based electrocatalysts for oxygen evolution reaction

Journal of Materials Chemistry A, Год журнала: 2022, Номер 11(4), С. 1634 - 1650

Опубликована: Дек. 29, 2022

Recently reported ruthenium (Ru)-based catalysts for the oxygen evolution reaction (OER) falling in Ru metal and compound subclasses are summarized with special emphasis being given to a discussion of activity/stability-enhancing strategies.

Язык: Английский

---