Showing papers on "Oxygen published in 2023"
TL;DR: In this article , a NA/NH2-MIL-125(Ti) homojunction was prepared by grafting 1-naphthylamine (NA, a chromophore group) on the NH2 group in part of NH2-ML-125 (Ti).
50 citations
TL;DR: In this paper , the authors summarized the recent progress of spinel-based catalysts with modified electronic configurations and their applications in OER and highlighted some advanced strategies for engineering spinels.
46 citations
TL;DR: In this paper , an oxygen vacancies enriched black TiO2 supported sub-nanometer Pt clusters (Pt/TiO2-OV) with metal support interactions is designed through solvent-free microwave and following low-temperature electroless approach for the first time.
Abstract: Oxygen vacancies-enriched black TiO2 is one promising support for enhancing hydrogen evolution reaction (HER). Herein, oxygen vacancies enriched black TiO2 supported sub-nanometer Pt clusters (Pt/TiO2-OV) with metal support interactions is designed through solvent-free microwave and following low-temperature electroless approach for the first time. High-temperature and strong reductants are not required and then can avoid the aggregation of decorated Pt species. Experimental and theoretical calculation verify that the created oxygen vacancies and Pt clusters exhibit synergistic effects for optimizing the reaction kinetics. Based on it, Pt/TiO2-OV presents remarkable electrocatalytic performance with 18 mV to achieve 10 mA cm-2 coupled with small Tafel slope of 12 mV dec-1. This work provides quick synthetic strategy for preparing black titanium dioxide based nanomaterials.
25 citations
TL;DR: NiSe@NiFe-LDH was developed by a facile solvothermal selenisation and electrodeposition technique in this article , where vertically aligned NiSe nanoarrays were prepared in situ using a facili-cial selenization technique, and the remarkable OER electrocatalytic performance was evidenced by the overpotential for driving 100 and 500 mA cm −2 , which are only 232 and 302 mV, respectively.
18 citations
TL;DR: Oxygen evolution reaction (OER) as an essential process in water decomposition and air batteries has received increasing attention in the context of clean energy production and efficient energy storage as mentioned in this paper .
Abstract: Oxygen evolution reaction (OER), as an essential process in water decomposition and air batteries, has received increasing attention in the context of clean energy production and efficient energy storage. With...
18 citations
TL;DR: In this article , the authors constructed bifunctional electrocatalysts by constructing atomically dispersed Fe-Se atom pairs supported on N-doped carbon (Fe-Se/NC).
Abstract: Herein, we successfully constructed bifunctional electrocatalysts by constructing atomically dispersed Fe-Se atom pairs supported on N-doped carbon (Fe-Se/NC). The obtained Fe-Se/NC shows a noteworthy bifunctional oxygen catalytic performance with a low potential difference of 0.698 V, far superior to that of reported Fe-based single-atom catalysts. The theoretical calculations reveal that p-d orbital hybridization around the Fe-Se atom pairs lead to remarkably asymmetrical polarized charge distributions. Fe-Se/NC based solid-state rechargeable ZABs (ZABs-Fe-Se/NC) present stable charge/discharge of 200 h (1090 cycles) at 20 mA/cm2 at 25 oC, which is 6.9 times of ZABs-Pt/C+Ir/C. At extremely low temperature of -40 oC, ZABs-Fe-Se/NC display an ultra-robust cycling performance of 741 h (4041 cycles) at 1 mA/cm2, which is about 11.7 times longer that of ZABs-Pt/C+Ir/C. More importantly, ZABs-Fe-Se/NC could be operated for 133 h (725 cycles) even at 5 mA/cm2.
18 citations
TL;DR: In this article , three-dimensional flower-like structures BiOBr (Fe-BiOBr) with rich surface oxygen vacancies (OVs) were prepared by a simple microwave method, and the Fe-biOBr composites completely degraded phenol solution (20 ppm) after 60 min of visible light irradiation in the presence of H2O2.
18 citations
TL;DR: Wang et al. as discussed by the authors developed single-atom copper anchored on Ti3C2Tx MXene nanosheets (Cu-SA/MXene) by molten salt etching for the generation of 1O2 via peroxymonosulfate activation.
Abstract: Singlet oxygen (1O2)-dominated advanced oxidation processes has drawn widespread attention for selective oxidation of organic pollutants in complex water environments. However, the high efficiency and selectivity of 1O2 generation remains challenging. Herein, we develop single-atom copper anchored on Ti3C2Tx MXene nanosheets (Cu-SA/MXene) by molten salt etching for the generation of 1O2 via peroxymonosulfate (PMS) activation. Particularly, it exhibits a high selectivity of 99.71% toward 1O2 generation by activating PMS, which shows outstanding catalytic activity for multiple pollutants, and strong resistance to inorganic anions. Experimental and theoretical results reveal that the Cu single atoms with three oxygen coordination environments (Cu-O3) are more favorable for PMS absorption and selectively adsorb the terminal oxygen of PMS to promote the generation of SO5.-, resulting in the generation of 1O2. A continuous-flow wastewater system by dispersing catalysts on poly (vinylidene fluoride) membrane exhibit stable catalytic activity for polycarbonate plant wastewater treatment over 8 h.
17 citations
TL;DR: In this paper , an In�O�Cd bond-modulated S-scheme heterojunction of In2O3/CdSe−DETA is synthesized by a simple microwave assisted hydrothermal method for the accelerated photogenerated electron transfer.
Abstract: The S‐scheme heterojunctions have great potential for photocatalytic carbon dioxide reduction due to their unique carrier migration pathways, superior carrier separation efficiencies, and high redox capacities. However, the precise process of the oriented powerful electron transport remains a great challenge. Herein, an InOCd bond‐modulated S‐scheme heterojunction of In2O3/CdSe‐DETA is synthesized by a simple microwave‐assisted hydrothermal method for the accelerated photogenerated electron transfer. Meanwhile, the oxygen vacancies (Vo) of In2O3 have an electron capture effect. Consequently, thanks to the synergistic effect of this In‐Vo‐In‐O‐Cd structural units at the interface, electrons are extracted and rapidly transferred to the surface‐active sites, which improves the electronic coupling of CO2. This finding precisely adjusts the electron transfer pathway and shortens the electron transfer distance. The synergistic effect of this chemical bond established in the S‐scheme heterostructure with oxygen vacancies in In2O3 (Vo‐In2O3) provides new insights into photocatalytic CO2 reduction.
16 citations
15 citations
TL;DR: In this article , a bifunctional oxygen catalytic performance with a low potential difference of 0.698 V was achieved by synthesizing atomically dispersed Fe-Se atom pairs supported on N-doped carbon.
Abstract: Herein, we successfully construct bifunctional electrocatalysts by synthesizing atomically dispersed Fe-Se atom pairs supported on N-doped carbon (Fe-Se/NC). The obtained Fe-Se/NC shows a noteworthy bifunctional oxygen catalytic performance with a low potential difference of 0.698 V, far superior to that of reported Fe-based single-atom catalysts. The theoretical calculations reveal that p-d orbital hybridization around the Fe-Se atom pairs leads to remarkably asymmetrical polarized charge distributions. Fe-Se/NC based solid-state rechargeable Zn-air batteries (ZABs-Fe-Se/NC) present stable charge/discharge of 200 h (1090 cycles) at 20 mA cm-2 at 25 °C, which is 6.9 times of ZABs-Pt/C+Ir/C. At extremely low temperature of -40 °C, ZABs-Fe-Se/NC displays an ultra-robust cycling performance of 741 h (4041 cycles) at 1 mA cm-2 , which is about 11.7 times of ZABs-Pt/C+Ir/C. More importantly, ZABs-Fe-Se/NC could be operated for 133 h (725 cycles) even at 5 mA cm-2 at -40 °C.
TL;DR: In this article , an oxygen-rich organic/inorganic (reduced graphene oxide (rGO)/ZnO2-Ag) nanoframeworks as suppliers of O2 nanobubbles with dual pH and temperature sensitive behavior were developed to suppress bacterial growth.
TL;DR: In this article , a closely packed hybrid electrocatalyst Pt1.5Ni1−x/Ni−N-C was engineered by a gas-promoted dealloying process, ensuring the relay catalysis of the reaction intermediates at Pt alloy and Ni single sites.
Abstract: A closely packed hybrid electrocatalyst Pt1.5Ni1−x/Ni–N–C was engineered by a gas-promoted dealloying process, ensuring the relay catalysis of the reaction intermediates at Pt alloy and Ni single sites, thus achieving high performance in PEMFCs.
TL;DR: In this paper , the 1D ultrafine configuration and abundant oxygen vacancies endow the Bi5O7Br nanowires with extended photoadsorption, boosted charge separation and enhanced interfacial CO2 adsorption and activation.
Abstract: Sluggish charge kinetics, poor photoabsorption and low CO2 affinity have been regarded as the main obstacles inhibiting the efficiency of CO2 photoreduction. Herein, freestanding ultrafine Bi5O7Br nanowires with abundant oxygen vacancies were initially fabricated to synchronously optimize these critical processes. The 1D ultrafine configuration and abundant oxygen vacancies endow the Bi5O7Br nanowires with extended photoadsorption, boosted charge separation and enhanced interfacial CO2 adsorption and activation. Density functional calculations reveal that the presence of oxygen vacancies on the Bi5O7Br surface can not only afford abundant localized electrons and lower the CO2 reaction energy barriers, but also have a stronger covalent interaction and more efficient electron exchange and transfer between CO2 and oxygen vacancies. Without any co-catalyst or sacrifice reagent, OV-rich Bi5O7Br nanowires show a 27.76-fold enhancement of CO2 photoreduction activity relative to bulk Bi5O7Br in the gas-solid system. This work may inspire the future design of ultrafine catalysts for artificial photosynthesis.
TL;DR: In this article , the effects of oxygen concentration and regeneration temperature on continuous pulsation regeneration of DPF (diesel particulate filter) for heavy-duty truck are investigated, and the regeneration performance characteristics of the oxygen concentration of 7.2%, 8.2% and 9.4% were investigated.
TL;DR: In this article , a syngas was produced via a biomass chemical looping gasification (CLG) process, where the hematite was modified with different metal oxides (CeO2, CaO and MgO) by the impregnation method.
Abstract: Syngas is a clean energy carrier and a major industrial feedstock. In this paper, syngas was produced via biomass chemical looping gasification (CLG) process. Hematite, the most common Fe-based oxygen carrier (OC), was modified with different metal oxides (CeO2, CaO and MgO) by the impregnation method. The hematite modified by CeO2, CaO and MgO was namely as CeO2-hematite (CeO2-H), CaO-hematite (CaO-H) and MgO-hematite (MgO-H), respectively. The introduction of CeO2, CaO and MgO enhanced the reactivity of lattice oxygen of hematite. The optimum condition for syngas production had been explored as the mass ratio of oxygen carrier to biomass (O/B) of 0.2, the mass ratio of steam to biomass (S/B) of 0.75 and temperature of 800°C in the biomass CLG process. The CeO2-H exhibited the most wonderful performance compared to that for CaO-H and MgO-H. The crystal composition of OC influenced greatly in the CLG process. CeFeO3 had a good oxygen mobility property and lattice oxygen releasing capacity due to the most oxygen vacancy distributed on the OC surface and the most active lattice oxygen, which is conducive to the biomass chemical looping gasification process for syngas production, leading to the highest gasification efficiency of 95.86% and gas yield of 1.20 m3/kg of the three. Cyclic test proved that CeO2-H had well sintering resistance and cyclic performance.
TL;DR: In this paper , the defect engineering is applied in the hydrothermally-synthesized ZnO by heat treatment to fabricate ZnOs catalysts with various concentrations of oxygen vacancy.
TL;DR: In this article , a facile surface functionalization-carbonization-phosphidation strategy is proposed to construct a novel composition-structure-controllable nanomaterial from a zeolite imidazole ester framework (ZIF67), which has been applied in oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and Zn-air batteries.
TL;DR: In this paper , a Pt/Ni-CeO2 catalyst via Ni doping was constructed, which exhibited the excellent toluene catalytic performance, as well as remarkably improved water-resistance and SO2-tolerance.
Abstract: It is a challenge to enhance the catalytic activity of the oxidation of volatile organic compounds (VOCs) and the poison-tolerance capacity in the practical application. Here, we report the construction of Pt/Ni-CeO2 catalyst via Ni doping, which exhibited the excellent toluene catalytic performance, as well as remarkably improved water-resistance and SO2-tolerance. The electron energy loss spectroscopy and density functional theory calculations demonstrated that the doped Ni species induced the generation of abundant oxygen vacancies from bulk to the surface, improving the redox property, activation of oxygen species, and adsorption capacity of toluene molecules. Moreover, the Pt-NiO interfacial structure was formed by the thermal-driven Ni species to the adjacent Pt species, which could modify the electronic and chemical properties of Pt, thus restraining the adsorption of water and SO2 molecules. This investigation provides new insights into the activation of oxygen species via oxygen vacancies, and anti-poison activity via surface modification engineering for catalyst development in practical applications.
TL;DR: In this article , Mg-introduced Fe-N carbon nanotube catalysts (FeMg@NCNTs) were prepared for peroxymonosulfate (PMS) and found a transformation from the original radical pathway to a non-radical pathway dominated by singlet oxygen ( 1 O 2 ).
TL;DR: In this paper , the cathodic CO2 redcution reaction with the anodic oxidation reaction is proposed to convert CO2 to highly value-added dialkyl carbonate.
Abstract: Electrochemical CO2 conversion to highly value-added dialkyl carbonate by coupling the cathodic CO2 redcution reaction with the anodic oxidation reaction is prospective. However, the structures of electrocatalysts should be well...
TL;DR: In this article , a photocatalytic reduction of nitrogen to ammonia using abundant O vacancies was proposed, and the experimental results show that the ammonia generation rates of BiOCl and BiOBr constructed with O vacancies reach 40.51 μmol g−1 h−1 and 49.66 μmol G−1 H−1 , respectively, which are significantly higher than those of pure BiOCL and BiBr.
TL;DR: In this article , the authors incorporated F anion into oxygen vacancies of spinel ZnCo2O4 and established the link between electronic structure and the OER catalytic mechanism.
Abstract: The development of productive catalysts for oxygen evolution reaction (OER) remains a major challenge that requires significant progress in both mechanism and material design. Conventionally, the thermodynamic barrier of the lattice oxidation mechanism (LOM) is lower than that of absorbate evolution mechanism (AEM) because the former could bypass certain limitations. However, it remains a challenging task to control the OER pathway from the AEM to the LOM by taking advantage of the intrinsic properties of catalyst. Herein, we incorporate F anion into oxygen vacancies of spinel ZnCo2O4 and establish the link between electronic structure and the OER catalytic mechanism. Density theoretical calculation reveals that F upshifts O 2p center and activate the redox capability of the lattice O, successfully triggering the LOM pathway, achieving a low overpotential of 350 mV at 10 mA cm-2. Moreover, the large electronegativity of F anion is favorable for the balance of residual protonation, which can stabilize the structure and locally trigger LOM without surface reconstruction during OER reaction. This finding provides a feasible strategy to concurrently enhance the activity and stability of OER, and demonstrates the significance of considering lattice oxygen participation for understanding the OER trend of highly active spinel.
TL;DR: In this paper , a stable quasi-solid electrolyte (QSE) composed of thermoplastic polyurethane and nano-fumed silica aerogels with high mechanical robust, superior hydrophobicity, exceptional thermal and electrochemical stability, as well as the capability to achieving dendrite-free deposition behaviors.
TL;DR: In this paper , an effective modification strategy is proposed by arming a sub-nanometer RuO2 skin with abundant oxygen vacancies to the interconnected Ru clusters/carbon hybrid microsheet, which can not only inherit the high hydrogen evolution reaction (HER) activity of the Ru, but also activate the superior activity toward the oxygen evolution reaction in both acid and alkaline conditions.
Abstract: Water electrolysis has been expected to assimilate the renewable yet intermediate energy‐derived electricity for green H2 production. However, current benchmark anodic catalysts of Ir/Ru‐based compounds suffer severely from poor dissolution resistance. Herein, an effective modification strategy is proposed by arming a sub‐nanometer RuO2 skin with abundant oxygen vacancies to the interconnected Ru clusters/carbon hybrid microsheet (denoted as Ru@V‐RuO2/C HMS), which can not only inherit the high hydrogen evolution reaction (HER) activity of the Ru, but more importantly, activate the superior activity toward the oxygen evolution reaction (OER) in both acid and alkaline conditions. Outstandingly, it can achieve an ultralow overpotential of 176/201 mV for OER and 46/6 mV for the HER to reach 10 mA cm−2 in acidic and alkaline solution, respectively. Inspiringly, the overall water splitting can be driven with an ultrasmall cell voltage of 1.467/1.437 V for 10 mA cm−2 in 0.5 m H2SO4/1.0 m KOH, respectively. Density functional theory calculations reveal that armoring the oxygen‐vacancy‐enriched RuO2 exoskeleton can cooperatively alter the interfacial electronic structure and make the adsorption behavior of hydrogen and oxygen intermediates much close to the ideal level, thus simultaneously speeding up the hydrogen evolution kinetics and decreasing the energy barrier of oxygen release.
TL;DR: In this article , a simple morphology and defect modulation strategy is proposed to synthesize multi-channel-like M-doped Co 3 O 4 nanosheets (M = Cu, Mn, Fe, Ni, and Zn) via the Lewis acid etching process.
TL;DR: In this article , Pd and Pt-catalysts loaded on non-oxide support (g-C3N4) were compared for CO and toluene co-oxidation, and Pt/C 3N4 presented excellent catalytic performance.
TL;DR: Using density functional theory calculations, a macrocyclic ligand coordinated yttrium single-atom (YN4) moiety is identified, which is originally ORR inactive because of the too strong binding of hydroxyl intermediate, while it can be activated by an axial ligand X through the covalency competition between Y�X and YOH bonds as discussed by the authors .
Abstract: Although being transition metals, the Fenton‐inactive group 3–4 elements (Sc, Y, La, Ti, Zr, and Hf) can easily lose all the outermost s and d electrons, leaving behind ionic sites with nearly empty outermost orbitals that are stable but inactive for oxygen involved catalysis. Here, it is demonstrated that the dynamic coordination network can turn these commonly inactive ionic sites into platinum‐like catalytic centers for the oxygen reduction reaction (ORR). Using density functional theory calculations, a macrocyclic ligand coordinated yttrium single‐atom (YN4) moiety is identified, which is originally ORR inactive because of the too strong binding of hydroxyl intermediate, while it can be activated by an axial ligand X through the covalency competition between YX and YOH bonds. Strikingly, it is also found that the binding force of the axially coordinated ligand is an effective descriptor, and the chlorine ligand is screened out with an optimal binding force that behaves self‐adaptively to facilitate each ORR intermediate steps by dynamically changing its YCl covalency. These experiments validate that the as‐designed YN4‐Cl moieties embedded within the carbon framework exhibit a high half‐wave potential (E1/2 = 0.85 V) in alkaline media, the same as that of the commercial Pt/C catalyst .