INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Xiang Gong,Zhao Jiang,Tao Fang
N-ethylcarbazole/dodecahydro-N-ethylcarbazole (NECZ/12H-NECZ) was a promising system for hydrogen storage applications. 1.0 wt% Pt/TiO 2 was regarded as the optimal loading in Pt/TiO 2 catalyst applied in the 12H-NECZ dehydrogenation reaction. The hydrogen release amount, selectivity to NECZ and TOF of 12H-NECZ dehydrogenation are 5.75 wt %, 98% and 229.73 min −1 at 453 K. Compared with the commercial 5.0 wt% Pd and Pt-based catalysts, it exhibited very high activity, selectivity and stability for 12H-NECZ dehydrogenation with low Pt loading. Combined with the XRD , XPS , HRTEM , TPR analysis, it was indicated that the enhanced catalytic performance was due to the SMSI (strong metal-supporting interaction) between Pt and TiO 2 support, which accelerated the rate-limiting step and enhanced the whole dehydrogenation reaction. This work may be beneficial for the commercial application of Pt/TiO 2 catalysts in the Liquid Organic Hydrogen Carrier (LOHC) system.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Inorganics
·
2023
·Vol. 11
·期 9
·366
·
IF 2.9
Jieting Zhao,Jiannan Song,Xilai Lu,Menghan Wu,Zhiqiao Yan,Feng Chen,Wanping Chen
Soluble noble metal salts are widely used for loading noble metals as nano-catalysts in many applications. In this paper, Pt-SnO2composite nanoceramics were prepared from SnO2nanoparticles and H2PtCl6using two Pt loading methods separately: for the solution reduction method, a H2PtCl6solution was added to a suspension of SnO2and zinc powder to form Pt on SnO2nanoparticles, and for the impregnation method, Pt was formed from H2PtCl6in the course of sintering. Although a series of samples prepared using both Pt loading methods showed a solid response to H2at room temperature, the ones prepared using the solution reduction method exhibited much better room-temperature hydrogen-sensing characteristics. For two samples of 0.5 wt% Pt and sintered at 825 °C, the response value for the sample prepared using the solution reduction method was 9700 to 1% H2–20% O2-N2, which was much larger than the value of 145 for the sample prepared using the impregnation method. Samples prepared using the two Pt loading methods have similar microstructures characterized via XRD, FESEM, EDS, TEM, and HRTEM. However, the residual chlorine content in those using the impregnation method was higher than those using the solution reduction method according to the analysis. It is proposed that the striking difference in room-temperature hydrogen sensing characteristics among samples prepared using these two different Pt loading methods separately resulted from their different chlorine removal processes. This study demonstrates the importance of a proper method for loading noble metals from their soluble salts as nano-catalysts in many applications.Keywords:SnO2;gas sensor;room temperature;Pt loading;catalyst
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Tongtong Liu,Yawen Wang
Platinum loaded BiOBr with iodine doping photocatalyst (Pt/I-BiOBr) was synthesized to further improve the photocatalytic activity of BiOBr. The photocatalytic test showed the bisphenol A degradation efficiency of Pt/I-BiOBr under visible light was about 93% within 20 min, about 5.8, 1.5 and 1.3 times that of BiOBr, iodine doped BiOBr and platinum loaded BiOBr, respectively. The composition, morphology, optical property and dominant active radical were investigated. Based on the results, a possible mechanism was proposed. Iodine doping and platinum loading played a synergetic effect on broadening the visible light absorption range and increasing the photo-induced carrier separation efficiency of BiOBr.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 9
·096504
·
IF 4.316
Xuan Jian,Tong-Tong Wei,Mi-Mi Zhang,Rui Li,Jian-Xin Liu,Zhen-Hai Liang
The design of high-performance catalysts for hydrogen evolution reaction (HER) is urgently needed in the development of renewable energy. Herein, we report a rapid strategy for synthesizing an efficient catalyst with ultralow-Pt nanoclusters on a two-dimensional titanium carbide (Ti3C2Tx) MXene support (denoted as Pt NCs-MXene, 5 μg cm−2) via electrophoretic deposition and cyclic voltammetry. The MXene support not only provides more active sites to anchor Pt nanoclusters (NCs) but also increases the electrochemically active surface area. The electrochemical HER performance of the as-synthesized Pt NCs-MXene catalyst was investigated in an acid electrolyte. The results showed that at a current density of 10 mA cm−2, the overpotential and Tafel slope of the Pt NCs-MXene were 40 mV and 50.8 mV dec−1, respectively, lower than those of the commercial 20 wt% Pt/C catalyst. The turnover frequency and mass activity of the Pt NCs-MXene were 7.09 H2 s−1 and 7.02 A mgPt−1, respectively, which were approximately 70 times those of the Pt/C catalyst. Moreover, the developed catalyst also exhibited a stable hydrogen evolution current for 18 h in a long-term cycling test. This work can provide novel and nontoxic methods for the preparation of low-Pt loading electrocatalysts for high-efficiency HER.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
COMPTES RENDUS CHIMIE
·
2019
·
IF 2.366
Hau Quoc Pham,Tai Thien Huynh,Hoang Ngoc Bich,Toan Minh Pham,Son Truong Nguyen,Le Trong Lu,Van Thi Thanh Ho
High cost and poor durability of Pt-based electrocatalysts are the main challenges for future commercialization of direct ethanol fuel cells (DEFCs). In the present work, a stable and effective Pt/Ti 0.8 W 0.2 O 2 electrocatalyst toward ethanol electrooxidation reactions (EORs) was prepared by utilizing the attributes of noncarbon catalyst supports and low Pt loading. The 18.5 wt % Pt/Ti 0.8 W 0.2 O 2 electrocatalyst was successfully fabricated through a simple and rapid microwave-assisted polyol route (ethylene glycol was used as a reducing agent). In comparison with a conventional 20 wt % Pt/C electrocatalyst, the as-prepared 18.5 wt % Pt/Ti 0.8 W 0.2 O 2 electrocatalyst resulted in much lower onset potential, higher I f / I b value, and superior stability toward EOR, which can be ascribed to the synergistic effect between Pt nanocatalyst and the Ti 0.8 W 0.2 O 2 catalyst support. Therefore, these findings imply that 18.5 wt % Pt/Ti 0.8 W 0.2 O 2 is a promising anodic electrocatalyst and possesses the ability to replace Pt/C electrocatalysts in the future.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 35
·16752-16763
·
IF 3.925
Kai Guo,Aizeng Ma,Zijian Wang,Jinzhi Li,Bingfeng Wu,Tong Liu,Dadong Li
The design of various hierarchical structures and morphologies of ZSM-22 zeolite catalysts is attempted through a post-treatment using different concentrations of NaOH and subsequently treating with HCl solution including fluosilicic acid (H2SiF6) and then loading Pt on their surfaces. The effects of samples on textural characters, acidity, as well as n-heptane catalytic hydroisomerization evaluation were examined. The formation process of the hierarchical structures was further investigated. Test and evaluation results indicated that samples treated with 0–0.5 M NaOH and subsequently treated with 6.0 M HCl and 0.1 M H2SiF6 were much more controllable and reasonable due to the better structure-activity relationship of the catalyst by changing crystal morphologies and introducing hierarchical structures. Indeed, PZH-0.3 exhibited 81.1% of the highest n-heptane conversion and 76.4% of total i-heptane yield in the n-heptane catalytic hydroisomerization process at 260 °C, PZH-0.5 displayed 13.6% of the maximum multi-branched i-heptane yield, which was above 104.1% in comparison with PZ-0 at 320 °C. Moreover, PZH-0.3 presented the highest n-butane yield, which possessed a proportion of 65.9% in the butane component of cracking products at 340 °C and improved an average of 16% and 22 times when utilizing PZ-0 and Pt/ZSM-5 catalysts. Additionally, the mechanism of the reaction process is briefly depicted according to the distribution of the reaction products. The regulation of zeolite both on crystal morphologies and pore hierarchy has obvious advantages in the hydroisomerization process, which can improve the composition of multi-branched isomers with high octane number effectively as well as supply raw materials for the chemical industry.
研究领域:
催化化学
·
石油化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Meiqiu Hu,Xiaolong Liu,Hong Yuan,Jingye Ma
An in situ encapsulation process was used to prepare ordered worm-like mesoporous Pt@SAPO-11 catalysts with different Pt loadings. Transmission electron microscopy images showed that Pt nanoparticles encapsulated within the SAPO-11 support mesopores were uniformly distributed and highly dispersed and had a narrow particle size distribution of 2–7 nm. Scanning electron microscopy indicated that increasing the Pt loading from 0.6 to 1.6 wt % did not significantly change the crystalline morphology of the catalyst, although the crystallinity decreased slightly. The specific surface area and average pore diameter of the Pt@SAPO-11 were in the ranges of 72–116 m2/g and 8.1–9.5 nm, respectively, which are determined by the Brunauer–Emmett–Teller method and Barrett–Joyner–Halenda method, respectively. The NH3 thermal-programmed desorption established that increasing the Pt loading gradually decreased the total NH3 desorption and that a loading of 1.2 wt % produced the highest concentration of medium-strong acid sites (6.2 cm3/g STP). X-ray photoelectron spectroscopy and H2 temperature-programmed reduction showed that a Pt loading of 1.2 wt % gave the strongest interaction between Pt nanoparticles and the SAPO-11 support. The Pt@SAPO-11 catalysts were used for the preparation of C8–C17 alkanes by decarboxylation of oleic acid. Employing a reaction temperature of 340 °C, a CO2 atmosphere, a Pt loading on the catalyst of 1.2 wt %, and a reaction time of 4 h, 100% oleic acid conversion was obtained together with an 80% yield of C8–C17 alkanes.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Huiyuan Liu,Jiaqi Qin,Yang Lv,Zhuo Li,Weiqi Zhang,Qian Xu,Huaneng Su
As the core component, high-performance catalyst-coated membranes (CCMs) are of critical importance for proton exchange membrane (PEM) fuel cells. Composition and microstructure modulations of CCMs are feasible strategies to improve their performance. Herein, an integrated ultrathin ultralow-Pt CCM with a ∼197-nm-thick catalyst layer (CL) and a Pt loading of ∼16 μg cm–2 on each side is directly prepared with a wet-chemical method. The synergistic effect of the precursor and reductant is responsible for the regioselective nucleation and growth of a peony-like Pd nanoflower at the interface of a membrane and reaction solution, followed by the deposition of 4–5 layers of dense Pt nanoparticles on Pd (i.e., Pt/Pd nanoflower CCM). A single cell of the Pt/Pd nanoflower CCM demonstrates a significantly improved mass activity (4.38 A mgPt–1 at 0.9 V) compared with that of the conventional Pt/C CCM (0.22 A mgPt–1). The enhanced performance originates from a high electrochemical active surface area (50.3 and 36.1 m2 gPt–1 for the Pt/C CCM), an increased Pt utilization efficiency (50.4%, 38.7% for the Pt/C CCM), and remarkable oxygen reduction reaction activity (specific activity at 0.9 V: 86.98, 6.09 A m–2 for the Pt/C CCM) closely related to the electronic effect at the Pt and Pd interface. An accelerated degradation test manifests that the prepared Pt/Pd nanoflower CCM is more stable than the conventional CCM. This study opens up a unique avenue to directly engineer nanostructured ultrathin CLs on both sides of a membrane with potential applications in electrochemical energy conversion and storage systems.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhenze Xie,Yucheng Huang,Jingguang Wang,Wenxin Guo,Yutao Lin,Yingxin Lin,Chang Du
Breast cancer is one of the most widespread cancers worldwide in the female population. However, the side effects and toxicity of chemotherapy and radiotherapy are the obstacles to the treatment of breast cancer. Therefore, we developed a Pt loaded CoFe 2 O 4 -based nanoparticles (CF@Pt) for breast cancer treatment with chemodynamic therapy (CDT) and sonodynamic therapy (SDT). The Co 2+ /Co 3+ and Fe 2+ /Fe 3+ gave CF@Pt peroxidase-like activity and catalase activity to gain ·OH and O 2 in the tumor microenvironment (TME) for CDT. Furthermore, the separation of electron-hole pairs of CF@Pt transferred the O 2 into 1 O 2 in the presence of ultrasound (US) for SDT. The high level of O 2 generated by CDT would produce more 1 O 2 by SDT that promoted the CDT efficiency. Moreover, the addition of Pt limited the recombination of electron-hole pairs and reduced the energy gap to enhance SDT/CDT combination therapy. In addition, CF@Pt could be engulfed by MDA-MB-231 cells and induced the apoptosis while it had good biocompatibility and blood compatibility. This design provided a novel application on the treatment of breast cancer.
研究领域:
肿瘤学
·
纳米医学
·
生物材料学
✓ 已验证
产品关联
DOI
高影响因子
Fundamental Research
·
2025
·
IF 6.3
Fengquan Li,Yuan Liu,Yan Dong,Haozhi Wang,Tongzhou Wang,Junda Lu,Wenjie Huang,Xiangqi Chen,Yuanyuan Guo,Xuerong Zheng,Yida Deng
Pt-carbon materials are identified as state-of-the-art electrocatalysts for oxygen reduction reaction (ORR). However, it is still a big challenge to reduce the usage of Pt while maintaining the high efficiency and durability of the catalysts. Herein, we report a topologicallly defective nanoparticle carbon (DPC) supported PtCo nanoparticles (PtCo NPs) catalyst (denoted as PtCo-DPC) with a low Pt loading for efficient ORR. The topological carbon defects with a low work function can serve as anchoring sites to trap and stabilize PtCo NPs for driving ORR. Meanwhile, the presence of topological carbon defects leads to the electron structure regulation and the lattice contraction for the PtCo NPs. The prepared PtCo-DPC demonstrates an increased half-wave potential (E 1/2 , 0.85 V vs. RHE) with a low Pt loading (4.74 μg Pt cm -2 ) and delivers a superior mass activity (MA) with 1.02 A mg pt -1 . Furthermore, the PtCo-DPC maintains a high stability after 100,000 cycles of accelerated durability test (ADT).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Zhi Liang Zhao,Qi Wang,Lian Ying Zhang,Hong Ming An,Zhou Li,Chang Ming Li
Development of an inexpensive high performance catalyst with low Pt loading remains a great challenge. Herein galvanic exchange-formed ultra-low Pt loaded porous Ag-Pd binary alloy nanotubes (Pt/Ag-Pd) was prepared as a catalyst toward oxygen reduction reaction (ORR). With highly dispersed active but ultra-low Pt atoms (Pt: about 5.8 wt%) on the porous binary alloy surface, the Pt/Ag-Pd catalyst increases mass activity toward ORR by 1.82 times than commercial Pt/C while possessing excellent operation stability. The performance enhancement is mainly attributed to the unique porous Pt shell/Ag-Pd core tubular structure for increased active sites and facilitated interfacial electron transfer rate by a unique Ag-Pd jointly modified electronic structure. This catalyst holds great promise for practical applications in low temperature fuel cells.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-13
·
IF 17.694
Tang Hongying,Geng Kang,Aili David,Ju Qing,Pan Ji,Chao Ge,Yin Xi,Guo Xiang,Li Qingfeng,Li Nanwen
A key challenge for fuel cells based on phosphoric acid doped polybenzimidazole membranes is the high Pt loading, which is required due to the low electrode performance owing to the poor mass transport and severe Pt poisoning via acid absorption on the Pt surface. Herein, these issues are well addressed by design and synthesis of effective catalyst binders based on polymers of intrinsic microporosity (PIMs) with strong hydrogen-bonding functionalities which improve phosphoric acid binding energy, and thus preferably uphold phosphoric acid in the vicinity of Pt catalyst particles to mitigate the adsorption of phosphoric acid on the Pt surface. With combination of the highly mass transport microporosity, strong hydrogen-bonds and high phosphoric acid binding energy, the tetrazole functionalized PIM binder enables an H 2 -O 2 cell to reach a high Pt-mass specific peak power density of 3.8 W mg Pt −1 at 160 °C with a low Pt loading of only 0.15 mg Pt cm −2 .
研究领域:
材料科学
·
能源技术
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）