International Journal of Electrochemical Science
·
2023
·Vol. 14
·期 2
·1794-1808
·
IF 1.5
Hua Zhang,Huaixiang Li,Jiao Li,Haibin Sun,Lixia Zhou,Ruihua Wang
Herein, a graphene (Gr) and silicon nanowires (SiNWs) decorated n-silicon/platinum (Si/Pt) sensor was put forward to detect hydroquinone (HQ) in a photoelectrochemical (PEC) way. Platinum film was coated on the polished side of the n-silicon wafer by vacuum evaporation and SiNWs were fabricated uniformly on the other side of the wafer by electrochemical etching in a solution mixed by HF and ethanol with volume ratio 1:1 under illumination of scattered laser. The morphology and component of the SiNWs was characterized by SEM and EDS, respectively. The photoelectric properties of the SiNWs-Si/Pt were studied by semi-log current-voltage (log I–V) and photoresponse measurements. Results show that the SiNWs on the Si wafer enhance the photoelectric conversion efficiency of the Si/Pt Schottky junction by about 33% relative to Si/Pt without SiNWs. Then, graphene was prepared with Hummer method and was used to decorated the SiNWs-Si/Pt wafer to build a Gr-SiNWs-Si/Pt PEC sensor. The new sensor was used to detect HQ in a two-electrode PEC way at zero bias voltage in a linear range of 10-300 μM with a detection limit of 0.3 μM (S/N=3). Excellent selectivity of the sensor to HQ in the present of catechol (CC) and other interferences was proved by anti-interference experiment.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Weijia Li,Xinyu Yang,Yueying Zhang,Xidong Hao,Tong Liu,Xishuang Liang,Fangmeng Liu,Xu Yan,Fengmin Liu,Yuan Gao,Jian Ma,Geyu Lu
In this work, carbon fiber carrying platinum-nickel alloy is used as a sensing electrode material to develop a H 2 S gas sensor based on Nafion proton membrane. Characterizations of the material by X-ray diffraction (XRD), scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS) reveal that the structure and morphology of the particles change with the ratio of the alloy. The electrochemical specific area (ECSA) of the material is calculated by cyclic voltammetry, which further proves the influence of alloy formation on the catalytic performance of the materials. When the ratio of platinum to nickel is 1:1, the material is uniformly loaded and its catalytic performance is optimal. Thus, the device made with it has the highest sensitivity. The sensor's low detection limit is 0.2 ppm. For the incorporation of nickel, the sensitivity is increased to -0.306 μA/ppm, which is 18 % higher than before. Not only does the sensor have good repeatability and short response recovery time, the presence of oxygen and water vapor does not have much effect on the sensor. Therefore, it has a great application potential in the field of gas detection at room temperature.
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Sustainable Energy & Fuels
·
2019
·Vol. 3
·期 12
·3329-3334
·
IF 4.912
Chunjie Li,Shuli Yin,Hongjie Yu,Ziqiang Wang,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
The regulation of the composition and architecture of Pt-based noble metal materials is significantly important for the preparation of high-performance oxygen reduction electrocatalysts. In this work, Pd@PtPd dandelion-like yolk–shell nanoparticles (Pd@PtPd DYSNs) were rationally fabricated by a simple template method. On account of the unique structure and the admirable match of Pt and Pd, the prepared Pd@PtPd DYSNs exhibit dramatically enhanced oxygen reduction activity and stability compared with PtPd dandelion-like hollow nanoparticles (PtPd DHNs) and commercial Pt/C. The present synthetic strategy contributes to lowering cost and improving catalytic performance, which is of great significance for the development of Pt-based catalysts with advanced properties.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Daguo Wu,Yong Liu,Xinghua Zhang,Jianguo Liu,Qi Zhang,Longlong Ma,Lungang Chen
The effective utilization of biomass is essential for addressing environmental challenges. The direct conversion of cellulose into chemicals and fuels is a key step in fostering a sustainable society. In this study, a mesoporous Pt-WO x /Nb 2 O 5 catalyst is synthesized and characterized using N 2 sorption, XRD, ICP, CO pulse, TEM, SEM, NH 3 -TPD, PY-IR, H 2 -TPR, and XPS. Under optimized catalyst preparation and reaction conditions, the yields of ethanol and propanol reach 50.3 % and 20.2 %, respectively. The mesoporous structure of Nb 2 O 5 , coupled with Pt, provides a rich balance of acidic and hydrogenation-active sites. Additionally, WO x plays a crucial role in the C C bond cleavage of cellulosic glucose and the C O bond cleavage of ethylene glycol, facilitating ethanol formation through Pt and the abundant Lewis acid sites from Nb 2 O 5 .
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jianghui Qiu,Xiafei Gao,Juan Peng
The formaldehyde oxidation reaction (FOR) with ultra-low potential is an ideal alternative to the oxygen evolution reaction (OER), significantly reducing hydrogen production energy consumption. This reaction not only generates high-value formic acid but also releases H 2 at low potential, enhancing hydrogen production efficiency and economic viability. However, developing efficient and low-cost electrocatalysts remains a key challenge. In this study, a Pt single atom on Cu nanowire catalyst shows high catalytic activity for formaldehyde oxidation reaction (FOR). The catalyst achieves a current density of 100 mA cm −2 at 0.09 V vs. RHE, with formic acid yield, selectivity, and formaldehyde conversion rate all close to 100 %. A bipolar hydrogen production system (FOR-HER) based on Pt SA -Cu NWs and Pt/C assembly achieves a current density of 100 mA cm −2 at a low cell voltage of 0.12 V, demonstrating a Faraday efficiency close to 100 % for H 2 at both the anode and cathode, and can stable operation for 30 h. Density functional theory (DFT) studies reveal that the interaction between Pt single atoms and Cu enhances hydrogen adsorption, significantly reducing the free energy of H* coupling and thereby improving hydrogen production efficiency. This study elucidates the intrinsic mechanism behind the enhanced performance, providing valuable guidance for the development of high-performance, low-cost single-atom catalysts.
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SENSORS
·
2025
·Vol. 25
·期 10
·3195
·
IF 3.5
Cuiyan Han,Ziao Wang,Jiahong Cui,Shuqi Liu,Liu Yang,Yang Fu,Baolin Zhu,Cheng Guo
This article presents an integrated strategy that couples high-efficiency photocatalytic degradation with low-cost, rapid detection to overcome the main drawbacks of conventional TiO2-based photocatalysts, including a weak visible-light response, rapid charge–carrier recombination, and reliance on expensive instrumentation for dye concentration detection. Platinum-decorated TiO2(Pt/TiO2) was prepared by photoreduction deposition, and systematic characterization confirmed the successful loading of zero-valent Pt nanoparticles onto the TiO2surface, significantly improving charge separation and extending absorption into the visible region. Methylene blue degradation was quantified under ultraviolet (UV) and simulated sunlight; radical-scavenging tests clarified the reaction pathway. In parallel, smartphone images of the reaction mixture were processed in ImageJto extract red–green–blue (RGB) values, which were related to dye concentration through a partial least-squares (PLS) model validated against reference UV–Vis data. Pt/TiO2removed 95.0% of methylene blue within 20 min of UV irradiation and 90.2% within 160 min of simulated sunlight—31.8% and 19.1% faster, respectively, than pristine TiO2. The RGB-based PLS model achieved a coefficient of determination (R2) of 0.961 for the prediction set. By integrating photocatalysis with smartphone-based colorimetry, the proposed method enables rapid monitoring of organic dyes concentration, providing an intelligent and economical platform for industrial wastewater treatment.
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ChemPlusChem
·
2025
·
IF 2.8
Wenjie Zhai,Jiayi Wang,Ruili Liang,Xiaoli Fan,Xuewei Tao,Jianping He,Yachao Jin,Mingdao Zhang,Li Song
Graphical An ultra-low-loading Pt-based catalyst with excellent hydrogen evolution reaction catalytic activity is successfully fabricated by synthesizing functionalized nitrogen-doped carbon nanotubes with partially unzipped on the surface and by employing a convenient and rapid electrochemical deposition method. The development of a low-cost hydrogen evolution reaction (HER) catalyst is crucial for the implementation of hydrogen production via water electrolysis. Herein, a facile and rapid electrodeposition method to synthesize an ultra-low-loading platinum-based catalyst in a short time of 120 s without any other chemical additive is reported. A functionalized nitrogen-doped carbon nanotube (F-N-CNT) is utilized as a carbon support to controllably and effectively anchor the Pt species. With partially oxidized and unzipped, the surface of F-N-CNT is characterized with zig-zag graphene-like nanodomains, which provide enriched deposition sites for Pt species and act as a buffer preventing the agglomeration and overloading of the Pt. Due to rational design of the interfacial chemical environment, the optimized Pt/F-N-CNTs catalyst possesses an ultra-low loading of 1.37 wt% but delivers a prominent HER activity superior to commercial 20 wt% Pt/C. Therefore, this work provides a novel approach to preparing the Pt-based catalyst with outstanding activity and rational loading.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Danyang Wang,Menghan Xu,Kuangyi Li,Yong Yan,Xue Chen,Dongqi Yu,Rongrong Jia,Lei Huang
Ethanol sensors with low energy consumption and high performance have been applied in a wide range of areas. In this work, Pt-modified SnO 2 -TiO 2 composite nanomaterials prepared through ball milling and impregnation-reduction are fabricated for constructing microelectromechanical systems (MEMS) ethanol sensor. Tiny Pt nanoparticles are found uniformly dispersed on SnO₂-TiO₂. High quality gas-sensitive films are concentrated in the functional area of the MEMS chip. The loading of Pt significantly enhances the response to ethanol and reduced the optimal operating temperature. The 1.5% platinum-modified composite (A-ST) demonstrates a significant improvement in sensitivity to 50 ppm ethanol, with its response rising from 21.3 to 52.1, while the optimal operating temperature is reduced by 28°C, dropping from 288°C to 260°C. The limit of detection (LOD) is 240 ppb. This enhancement is primarily due to the n-n junction at the interface between SnO 2 and TiO 2 , along with the chemical and electronic sensitization effects generated by Pt on SnO 2 -TiO 2 .
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Processes
·
2025
·Vol. 13
·期 5
·1440
·
IF 2.8
Tongtong Zhang,Sijia Wang,Xingyuan Li,Yupeng Du,Jiajun Hu,Shi Jiang,Yu Guo
Room-temperature complete oxidation of formaldehyde (HCHO) is an important orientation of research programs, yet challenges remain. The development of efficient catalysts with high activity and excellent stability is of great significance for such practical application. Inspired by this whole catalytic process, we, therefore, chose HZSM-5 zeolite with abundant acidic sites as catalyst support and lactic acid (LA) as modifier to regulate the properties. The use of LA simultaneously enhances the hydroxyls density and increases the dispersion of Pt nanoparticles, which are better than the reference catalyst prepared via direct wetness impregnation method. Most satisfying of all, the lactic acid-modified HZSM-5-supported Pt catalyst demonstrates a remarkable reaction performance for room-temperature HCHO oxidation at a high concentration HCHO of 80 ppm and a large space velocity of 360,000 mL/g/h (especially with a low Pt loading of 0.5%). In addition, a 120 h test further confirms the favorable stability of the designed catalyst. This pre-modified strategy using organic acid might provide potential approach in the construction of efficient zeolite-supported catalysts.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Ze Fang,Xue Tian,Fengji Zheng,Xiaodong Jiang,Wanneng Ye,Yalin Qin,Xiaoxiong Wang,Yongcheng Zhang
Piezoelectric materials are widely used in electromechanical energy conversion, such as in sensors, transducers, and self-powered materials. In this paper, the influence of the Sm doping content on the microstructure and ferroelectric , piezoelectric , dielectric , and field-induced strain properties of 0.70Pb(Mg 1/3 Nb 2/3 )O 3 -0.30PbTiO 3 (PMN-PT) ceramics was investigated. Sm-doped PMN-PT ceramics with both high piezoelectric properties ( d 33 ∼1406 pC/N) and a large electromechanical coupling coefficient ( k p ∼0.69) were synthesized. Based on their piezoelectric effect, a maximum output voltage of 31 V was achieved under external forces. The output voltages showed satisfactory stability, repeatability, and sensitivity under periodic external forces; hence, Sm-doped PMN-PT piezoelectric ceramics are potential candidates for energy conversion and signal monitoring.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 3
·3014-3020
·
IF 1.338
Liu Xing-Quan,Chen Xue-Song,Wu Jian,Yao Lei
Three-dimensional (3D) Pd–Pt alloy with coral-like nanostructures were synthesized via bubble dynamic templated electrodeposition method at room temperature. The morphology of the asprepared nanostructures was characterized using scanning electron microscopy (SEM), EDS, high-resolution
transmission electron microscopy (HRTEM), respectively. Cyclic voltammetry method was adopted to evaluate the electrocatalytic activities of the synthesized electrodes toward oxygen reduction in KCl solution. The electrochemical results indicated that the Pd–Pt alloy with coral-like
nanostructures hold the high performance for oxygen reduction.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xiao Shang,Zi-Zhang Liu,Shan-Shan Lu,Bin Dong,Jing-Qi Chi,Jun-Feng Qin,Xien Liu,Yong-Ming Chai,Chen-Guang Liu
The hydrogen evolution reaction activity of carbon-supported Pt catalyst is highly dependent on Pt–C interfaces. Herein, we focus on the relationships between Pt activity and N/O-functionalized hollow carbon sphere (HCS) substrate in acidic media. The electrochemical dissolution of Pt counter electrode is performed to prepare Pt nanoparticles in low loading. The N groups are beneficial for homogeneously sized Pt nanoparticles, whereas the O groups lead to aggregated nanoparticles. Moreover, the proper electronegativity of the N groups may enable capturing of protons to create proton-rich Pt–C interfaces and transfer them onto the Pt sites. The O groups may also capture protons by hydrogen bonding, but the subsequent release of protons is more difficult due to a stronger electronegativity and result in an inferior Pt activity. Consequently, the N-doped HCS with a low Pt loading (1.7 μg cm–2 and 0.05 wt %) possesses a higher intrinsic activity compared with Pt on O-doped HCS. Moreover, it outperforms the commercial 20% Pt/C with a stable operation for 12 h. This work may provide suggestions for constructing the advantageous Pt–C interfaces by proper functional groups for high catalytic efficiencies.
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