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A Highly Efficient and Durable Water Splitting System: Platinum Sub-Nanoclusters Functionalized Nickel Iron Layered Double Hydroxides as the Cathode and Hierarchical Nickel Iron Selenides as the Anode
摘要： Developing cost-efficient and effective catalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) remains a great challenge for the applications of high-efficiency water electrolyzers. In this work, we design a highly efficient and durable water splitting system in an alkaline solution, of which the platinum (Pt) sub-nanoclusters (average size: 0.59 nm) functionalized nickel iron layered double hydroxide nanosheets on carbon fiber cloth (Pt-NiFe LDH/CC) serve as the cathode and the hierarchical (Ni0.77Fe0.23)Se2 nanosheets on CC ((Ni0.77Fe0.23)Se2/CC) act as the anode. For the HER, the three-dimensional (3D) Pt-NiFe LDH/CC electrode with an ultralow Pt content (1.56 wt%) drives a current density of 10 mA cm-2 under an ultralow overpotential of 28 mV. For the OER, the edge-rich (Ni0.77Fe0.23)Se2/CC electrode displays a current density of 10 mA cm?2 under a small overpotential of 228 mV, and the Tafel slope is as low as 69 mV dec?1. More importantly, the assembled Pt-NiFe LDH/CC || (Ni0.77Fe0.23)Se2/CC water splitting electrolyzer exhibits a high current density of 30 mA cm?2 at a low cell voltage of 1.57 V, which is superior than that of electrolyzer assembled by the commercial 20 wt% Pt/C and RuO2 electrodes (30 mA cm?2 at 1.62 V). Additionally, the Pt-NiFe LDH/CC || (Ni0.77Fe0.23)Se2/CC electrolyzer displays excellent stability over 40 hours even at a high current density of 50 mA cm?2, which shows a great potential in the practical applications of full water splitting.
关键词： Hydrogen Evolution Reaction,Platinum Sub-Nanoclusters,Oxygen Evolution Reaction,NiFe Layered Double Hydroxide,Porous NiFe Selenide
更新于2025-09-19 17:15:36
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Determination of dopamine using the indium tin oxide electrode modified with direct electrodeposition of gold–platinum nanoparticles
摘要： Gold–platinum (Au–Pt) nanoparticles (NPs) with a ratio of 3:1 solution of chloride salts in the starting electrolyte were deposited on an indium tin oxide (ITO) surface, using a direct electrochemical method, by 40 successive cyclic voltammetry (CV) scans to obtain AuPtNPs/ITO electrode. The deposited nanoparticles were defined by energy dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM) and electrochemical methods. The nanoparticles size of electrodeposited was ~ 30 nm based on SEM results. The efficacy of number of CV scans in the electrodeposition of nanoparticles on the size of electrodeposited nanoparticles was tested. The elemental composition of AuPtNPs/ITO electrode was determined by EDX. Electrochemical studies proved that the electrocatalytic activity of prepared electrode is excellent towards the oxidation of dopamine (DP). The concentration range of DP from 400 nM to 350 μM was linear and limit of detection DP was 20 nM. It was shown that the AuPtNPs/ITO electrode can be used as a sensor with high reproducibility, sensitivity, and long term stability. The selectivity of electrode for determination of DP was verified with investigating the effect of substances by potential interference on the response of electrode. AuPtNPs/ITO electrode was used for the determination of DP in injection and real samples, with acceptable results.
关键词： Dopamine,Gold–platinum alloy,Nanoparticles,Indium tin oxide electrode
更新于2025-09-19 17:15:36
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Molecular isomeric engineering of naphthyl-quinoline-containing dinuclear platinum complexes to tune emission from deep red to near infrared
摘要： Four isomeric dinuclear platinum complexes of (C^N)2Pt2(m-OXT)2 are synthesized and characterized with different C^N cyclometalating ligands and the same ancillary ligand of 5-(4-octylphenyl)-1,3,4-oxadiazole-2-thiol (m-OXT). These isomeric C^N ligands are 1-naphthyl-1-isoquinoline (niq), 2-naphthyl-1-isoquinoline (2niq), 1-naphthyl-2-quinoline (nq) and 2-naphthyl-2-quinoline (2nq). The isomeric effect on the photophysical, electrochemical and electroluminescence properties of (C^N)2Pt2(m-OXT)2 was systematically studied. It is found that the emissions were easy to tune from deep red to near infrared for (C^N)2Pt2(m-OXT)2 by changing the C^N isomers. Furthermore, the complexes with 2-naphthyl in these presented better electroluminescence (EL) properties than the complexes with 1-naphthyl. In contrast to the (2nq)2Pt2(l-OXT)2-doped devices displaying a deep-red emission peaked at 686 nm with an external quantum efficiency (EQE) of 3.21%, the (2niq)2Pt2(l-OXT)2-doped devices exhibited a near-infrared emission peaked at 704 nm with a significantly increased EQE of 8.86% and a radiant emittance of 986 mW cm?2. Our research provides an efficient strategy to tune emission from deep red to near infrared by a simple isomeric engineering of dinuclear platinum(II) complexes.
关键词： deep red emission,isomeric engineering,near infrared emission,dinuclear platinum complexes,electroluminescence
更新于2025-09-19 17:15:36
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Laser machined ultrathin microscale platinum thermometers on transparent oxide substrates
摘要： Ultrathin microscale platinum resistive thermometers are of key value to transient temperature measurements. Neither transparent oxide substrates nor femtosecond laser patterning have been investigated for the fabrication of Pt thin film thermometers. Here, we have fabricated a laser machined, 50 μm wide and 50 nm thick, serpentine, Pt thin film sensor capable of sensing temperatures up to 650 oC. It is anticipated that this sensor can be used for fast, high spatial resolution temperature probing for laser processing applications.
关键词： Platinum,temperature sensor,thin film,in-situ,laser machining
更新于2025-09-19 17:13:59
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Development of a Prea??assembled TBET Fluorescent Probe for Ratiometric Sensing of Anticancer Platinum(ll) Complexes
摘要： Fluorescence microscopy has emerged as an attractive technique to probe intracellular processing of Pt-based anticancer compounds. Herein, we reported the first Through-Bond Energy Transfer (TBET) fluorescent probe NPR1 designed for sensitive detection and quantitation of PtII complexes. The novel TBET probe was successfully applied for ratiometric fluorescence imaging of anticancer PtII complexes such as cisplatin and JM118 in cells. Capitalizing on the ability of the probe to discriminate between PtII complexes and their PtIV derivatives, the probe was further applied to study the activation of PtIV prodrug complexes that are known to release active PtII species after intracellular reduction.
关键词： Platinum Drugs,Fluorescent Probes,Ratiometric,Cisplatin,Through Bond Energy Transfer
更新于2025-09-19 17:13:59
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Photoactivatable Prodrug-Backboned Polymeric Nanoparticles for Efficient Light-Controlled Gene Delivery and Synergistic Treatment of Platinum-Resistant Ovarian Cancer
摘要： Combination of chemotherapy and gene therapy provides an effective strategy for cancer treatment. However, lacking of suitable co-delivery systems with efficient endo/lysosomal escape and controllable drug release/gene unpacking is the major bottleneck for maximizing the combinational therapeutic efficacy. Herein, we developed a photoactivatable Pt(IV) prodrug-backboned polymeric nanoparticles system (CNPPtCP/si(c-fos)) for light-controlled si(c-fos) delivery and synergistic photoactivated chemotherapy (PACT) and RNAi on platinum-resistant ovarian cancer (PROC). Upon blue light irradiation (430 nm), CNPPtCP/si(c-fos) could generate oxygen-independent N3? with mild oxidation energy for efficient endo/lysosomal escape through N3?-assisted photochemical internalization with less gene deactivation. Thereafter, along with Pt(IV) prodrug activation, CNPPtCP/si(c-fos) would be disassociated to release active Pt(II) and unpack si(c-fos) simultaneously. Both in vitro and in vivo results demonstrated that CNPPtCP/si(c-fos) displayed excellent synergistic therapeutic efficacy on PROC with low toxicity. This PACT prodrug-backboned polymeric nanoplatform may provide a promising gene/drug co-delivery tactics for treatment of various hard-to-tackle cancers.
关键词： N3?-assisted photochemical internalization,photoactivatable polymeric nanoparticles,gene delivery,platinum-resistant ovarian cancer,photoactivated chemotherapy
更新于2025-09-19 17:13:59
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Self-Assembled Amphiphilic Molecules for Highly Efficient Photocatalytic Hydrogen Evolution From Water
摘要： Self-assembled molecules for outstanding hydrogen evolution rate and durability should promise practical water splitting due to the versatile visible light absorption, low production cost and ease of control. Here, we adapted an amphiphilic molecule as a building block for efficient small molecule based self-assembled photocatalyst for hydrogen evolution from water. The self-assembled molecules with platinum co-catalyst showed outstanding performance (turnover number ~ 27,000) virtually comparable to the state-of-the-art metal oxide based photocatalysts with catalytic activity extending over days. Transient absorption studies in combination with quantum chemical calculations revealed that elaborate excited state engineering of the molecules resulted in such high performance of hydrogen evolution from water. This study shows that the self-assembled amphiphilic molecules could pave the way to more economical and reproducible production of hydrogen from water.
关键词： Platinum co-catalyst,Amphiphilic molecule,Photocatalytic hydrogen evolution,Excited state engineering,Self-assembled molecules
更新于2025-09-19 17:13:59
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High Efficiency Solution-Processed Organic Light-Emitting Diodes with Tetradentate Platinum(II) Emitters
摘要： The realization of high efficiency solution-processed organic light-emitting diodes (OLEDs) by using phosphorescent tetradentate Pt(II) emitters and bipolar organic hosts is demonstrated in this work. To investigate the effect of organic host on the platinum dopant, the performances of solution-processed Pt-OLEDs with various combination between four tetradentate Pt(II) emitters, including two newly developed tetra-Pt-S2 and tetra-Pt-S3, and three bipolar organic hosts m-TPAPy, o-TPAPy, and o-CzPy, have been analyzed and compared. Among the tetradentate Pt(II) complexes studied in this work, tetra-Pt-S3 exhibited the best electroluminescent performance attributable to its bulky molecular scaffold structure, high emission quantum yield, and good solubility in common organic solvents. High external quantum efficiencies (EQEs) of up to 22.4% were achieved in the solution-processed OLED with tetra-Pt-S3 emitter and m-TPAPy host at the dopant concentration of 4 wt%. At a high luminance of 1000 cd m-2, the EQE of this device decreased slightly to 21.0%.
关键词： high efficiency,platinum complexes,organic light-emitting diodes,solution-process,bipolar organic host
更新于2025-09-16 10:30:52
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Optical and Thermal Properties of Laser-Ablated Platinum Nanoparticles Graphene Oxide Composite
摘要： Platinum nanoparticles were synthesized in graphene oxide aqueous solution using a laser ablation technique to investigate the effect of optical linear, nonlinear and thermal properties of platinum-graphene oxide nanocomposite solution. The samples were prepared with different ablation times. The platinum nanoparticles that formed a spherical shape on the surface of graphene oxide solution were authenticated using UV-visible spectrum and transmission electron microscopy patterns. The particle size decreased with increasing ablation time, and the concentration and volume fraction of samples were increased. To obtain the optical linear, nonlinear and thermal properties of platinum-graphene oxide nanocomposite solution, UV-visible spectroscopy, Z-scan, thermal lens and photoacoustic techniques were used. Consequently, the linear and nonlinear refractive indices increased with an increase in the volume fraction of platinum nanoparticles. It was observed from the spatial self-phase modulation patterns that, the optical nonlinear property of the graphene oxide was enhanced in the presence of platinum nanoparticles, and the nonlinearity increased with an increase in the volume fraction of platinum nanoparticles inside the graphene oxide solution. The thermal diffusivity and thermal effusivity of platinum nanoparticles graphene oxide were measured using a thermal lens and photoacoustic methods, respectively. The thermal diffusivity and thermal effusivity of samples were in the range of 0.0341 × 10?5 m2/s to 0.1223 × 10?5 m2/s and 0.163 W s1/2 cm?2 K?1 to 0.3192 W s1/2 cm?2 K?1, respectively. Consequently, the platinum enhanced the optical and thermal properties of graphene oxide.
关键词： graphene oxide,z-scan,spatial self-phase modulation,Pt-NPs,platinum nanoparticles/graphene oxide composite,laser ablation,photoacoustic,thermal lens
更新于2025-09-16 10:30:52
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Platinum counter electrodes for dye-sensitized solar cells prepared by one-step dipping process
摘要： When designing counter electrodes (CEs) to enhance the performance of dye-sensitized solar cells (DSSCs), facile routes are important features. Platinum (Pt) metal is one of the most-promising CE designs for DSSCs. Herein, we developed a simple, and cost-effective one-step dipping process for preparing Pt CEs in DSSCs. The Pt CEs were prepared by dipping fluorine-doped tin oxide (FTO) in a 3-mercaptopropyl triethoxysilane (MTS)-Pt suspension. We tested and compared MTS-1-Pt, MTS-10-Pt, and sputtered-Pt as CEs in DSSCs. MTS-1-Pt and MTS-10-Pt refer to samples prepared with 1 and 10 ml of MTS, respectively. DSSCs with MTS-1-Pt CEs exhibited power conversion efficiency (PCE) values as high as 8.28%, which was superior to the DSSCs using MTS-10-Pt as the CEs (1.61%). Additionally, the DSSCs with MTS-1-Pt CE showed mostly similar PCEs compared to those with sputtered-Pt (8.55%) because of the same catalytic activity with iodide. Thus, this modified Pt CE facile process can be used to further enhance the performance of DSSCs.
关键词： one-step dipping process,catalytic activity,power conversion efficiency,Platinum counter electrodes,dye-sensitized solar cells
更新于2025-09-16 10:30:52