INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Haidong Chen,Feng Zhang,Xianwen Sun,Weifeng Zhang,Guoqiang Li
We systematically investigated the impact of reaction atmosphere on the Pt cocatalyst photodeposition and hydrogen evolution . A long induction period which is hardly found in close-system appears in the presence of oxygen, and is affected by the concentration of chloroplatinic acid. The Pt cocatalyst is metal state and contributes to the electronic states near Fermi level judging from the valence band X-ray photoelectron spectrum. The cocatalyst metal Pt will reduce the surface photovoltage signals due to the metal feature. The hydrogen evolution rate increased and reached a platform with increasing the Pt coverage on the surface of photocatalyst which is characterized by the Pt:Ti atomic ratio.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2024
·
IF 14.4
Baoxin Ni,Peng Shen,Guiru Zhang,Jiajun Zhao,Honghe Ding,Yifan Ye,Zhouying Yue,Hui Yang,Hao Wei,Kun Jiang
Pt is a well-known benchmark catalyst in the acidic oxygen reduction reaction (ORR) that drives electrochemical O2-to-H2O conversion with maximum chemical energy-to-electricity efficiency. Once dispersing bulk Pt into isolated single atoms, however, the preferential ORR pathway remains a long-standing controversy due to their complex local coordination environment and diverse site density over substrates. Herein, using a set of carbon nanotube supported Pt–N–C single-atom catalysts, we demonstrate how the neighboring N dopants regulate the electronic structure of the Pt central atom and thus steer the ORR selectivity; that is, the O2-to-H2O2 conversion selectivity can be tailored from 10% to 85% at 0.3 V versus reversible hydrogen electrode. Moreover, via a comprehensive X-ray-radiated spectroscopy and shell-isolated nanoparticle-enhanced Raman spectroscopy analysis coupled with theoretical modeling, we reveal that a dominant pyridinic- and pyrrolic-N coordination within the first shell of Pt–N–C motifs favors the 4e– ORR, whereas the introduction of a second-shell graphitic-N dopant weakens *OOH binding on neighboring Pt sites and gives rise to a dominant 2e– ORR. These findings underscore the importance of the chemical environment effect for steering the electrochemical performance of single-atom catalysts.
研究领域:
电化学
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Engineering Materials
·
2024
·
IF 0
Liangyu Zhai,Xinliang Dai,Fei Rao,Lujun Zhu,Peizhi Yang,Siyan Wang,Xianjin Shi,Yu Huang,Yanmin Jia,Gangqiang Zhu
The performance of gas sensor materials was normally enhanced by modifying the surface with a noble metal loading and controlling the morphology of the material. In this research, the Sn2O3 nanoflowers formed by ultrathin nanosheets are modified by loading Pt nanoparticles in varying proportions, and the materials were prepared through a hydrothermal method. The structure, morphology, band gap, and specific surface area of the as-prepared samples are characterized by various techniques, and the effect of the contact between Pt nanoparticles and Sn2O3 nanoflowers on the sensitivity, response/recovery time, detection limit, and selectivity of formaldehyde gas sensing is investigated. Transmission electron microscopy (TEM) results confirm the uniform loading of Pt nanoparticles with sizes of 2–5 nm on the Sn2O3 nanoflowers. The performance test results reveal that compared to pure Sn2O3, the optimal operating temperature of the Pt-Sn2O3 sensor loaded with a mass ratio of 3% decreases from 200 to 90 °C, and the detection efficiency for formaldehyde gas is significantly improved. The response time is shortened from 143 to 39 s, and the recovery time is reduced from 237 to 58 s. The method exhibits high sensitivity (Ra/Rg = 3.66, 1 ppm) for low-concentration formaldehyde. Moreover, the gas sensor demonstrates excellent stability and repeatability. These outstanding performances are attributed to the large specific surface area and abundant reaction sites of the ultrathin Sn2O3 nanosheets as well as the catalytic effect of noble metal loading. The finding holds significant reference value and promising application prospects for rapid detection of low-concentration formaldehyde.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
DOI
ACS Catalysis
·
2018
·
IF 11.384
Yan Long,Shuyan Song,Jian Li,Lanlan Wu,Qishun Wang,Yu Liu,Rongchao Jin,Hongjie Zhang
Designing metal–organic framework (MOF)-encapsulated hybrid catalysts is considered as an effective way to realize catalytic selectivity because of advantages related to the unique channels of MOF. Here, a sodium polystyrenesulfonate (PSS)-induced, microwave-assisted route was developed to controllably construct Pt/CeO2@MOF core@shell hybrids. Using PSS as a modifying agent and followed by microwave assistance, MOFs could be continuously grown in an oriented manner on Pt/CeO2 nanospheres. The obtained Pt-CeO2@UIO-66-NH2 exhibited high conversion (99.3%) with high selectivity (>99%) for selective hydrogenation of furfural to furfuryl alcohol. It showed that the CeO2 would promote the catalytic activity, whereas the size confinement effect of the UIO-66-NH2 channels can enhance the catalytic selectivity. This work highlights a useful strategy toward the universal synthesis of highly active, stable, and selective catalysts for further utilization.
研究领域:
催化
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材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Haiyan Wang,Yanan Chen,Wenfu Xie,Xiaoxue Han,Qian Feng,Rong Jiang,Hu Shang,Feifei Zhang,Linna Gao,Zonghua Wang
A novel Pt/Ni-Fe layered double hydroxide (Pt/Ni-Fe LDH) electrocatalyst was fabricated by a two-step facile process for oxidation of methanol in alkaline medium. It is found that Pt/Ni-Fe LDH electrocatalyst exhibits higher electrocatalytic activity, better anti-poisoning ability and stability for methanol oxidation comparing to pure Pt black and commercial Pt/C catalyst. Such an enhancement is probably attributed to the synergistic effect of Ni-Fe LDH and the uniform loading of Pt nanoparticles on the LDH layers. When ionic liquid (IL) was introduced to the composites, the prepared Pt/IL/Ni-Fe LDH exhibits even better electrocatalytic behaviors (205.6 mA mg -1 Pt, I f /I b=5.67) than the Pt/Ni-Fe LDH. Moreover, the morphology and structure of composites were characterized using scanning electron microscope equipped with an energy dispersive X-ray spectrometry, transmission electron microscope, X-ray diffraction, and FT-IR spectra. It is found that the Ni-Fe LDH have a flake-like morphology, the mean diameter of Pt nanoparticles in Pt/Ni-Fe LDH and Pt/IL/Ni-Fe LDH electrocatalyst is 4.36 nm and 3.09 nm, smaller than that in pure Pt black and commercial Pt/C electrocatalyst (8.70 nm and 6.48 nm).
研究领域:
电化学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhikang Xu,Mingbin Gao,Xing Wu,Haibo Zhu
Pt-Cu bimetallic particles have been regarded as promising catalysts for propane dehydrogenation. The dispersion of Pt and Cu species on conventional supports always results in the formation of large Pt-Cu particles, and it is highly desirable to fabricate ultra-small Pt-Cu cluster catalysts for propane dehydrogenation. Herein, we used the isolated Cu species in the Cu-SSZ-13 to localize the Pt species and the alloying of Pt with Cu leads to a formation of ultra-small (<1 nm) Pt-Cu bimetallic clusters in the structure of SSZ-13. The structure of synthesized PtCu-SSZ-13 catalysts was studied by XRD, SEM, STEM, XPS, CO-FTIR, H 2 -TPR and EXAFS techniques, which demonstrates that Pt-Cu clusters are entrapped in the micropore of SSZ-13 and their migration can be greatly inhibited. The synthesized PtCu-SSZ-13 catalyst shows high activity and good regeneration in propane dehydrogenation. The optimized catalyst 0.3 %PtCu-SSZ-13 delivers propane conversion of 28.5 % (close to equilibrium conversion) with 100 % propane as feed under WHSV of 7.1 h −1 at 520°C, and its catalytic performance can be completely regenerated via calcination in air. Density functional theory (DFT) calculations indicate that the unique Pt-Cu bimetallic nanocluster structure reduces the energy potential for propane dehydrogenation as well as promotes the adsorption of C 3 H 8 and desorption of C 3 H 6 thus enhancing the activity of the PtCu-SSZ-13 catalyst.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2022
·
IF 2.84
Wei Shuangjiao,Bian Zhenglan,Wang Xingquan,Miao Xiaokang,Zhang Guilin,Xue Liang,Hu Anduo,Li Gaofang,Chu Fenghong
Pt-doped WO 3 materials have good hydrogen-sensing properties, which are widely used in the field of hydrogen sensing. In this paper, Sol-Gel method is used to prepare WO 3 /Pt sensing material and sensing characteristic to hydrogen is characterized by transmission optical fiber hydrogen sensing system fabricated at home. By optimizing the fabrication parameters including sol-gel viscosity, aging time, Pt:W moral ratio and layers of the sensing film, the sensitivity and repeatability of the film were greatly improved. The repeatability of the film is further improved by irradiating the film with an UV lamp. Experimental results show that by increasing the number of film layers from one to five (the thickness of the film is about 222 nm, and the content of Pt element is 13.47% by SEM test), the sensitivity increased by 1.666 times. The repeatability of the film can be improved by 3% through the irradiation of the ultraviolet lamp. The optimized WO 3 /Pt film was tested continuously for 12 times at 5% hydrogen concentration, and the zero drift was only 0.723%.
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
ACS Omega
·
2021
·
IF 3.512
Wenke Wang,Jie Zhao,Dandan Jia,Zhaolin Fu,Enhui Xing,Zhongpeng Zhu,Rui Yan,Zhiping Tao,Yibin Luo,Xingtian Shu
The fast deactivation caused by serious formation of coke is a major challenge in catalytic isomerization of endo-tetrahydrodicyclopentadiene (endo-THDCPD) into exo-tetrahydrodicyclopentadiene (exo-THDCPD) over the HY zeolite. In order to suppress the coke formation for the isomerization process, the conventional HY zeolite was modified with Pt at 0.3 wt %. Then, the hydroisomerization of endo-THDCPD into exo-THDCPD was evaluated over a fixed-bed reactor. The catalytic stability of Pt/HY was greatly enhanced in comparison to that of the HY zeolite. The Pt/HY catalyst provided 97% endo-THDCPD conversion and 96% selectivity for exo-THDCPD without deactivation after 100 h. Moreover, the formation mechanism of coke on the HY zeolite during the isomerization process was proposed based on the results of the coke analysis. It was indicated that the coke was generated from the oligomerization and condensation of olefin species, which originated from the β-scission reaction or hydride transfer reaction of intermediates. The lower coke formation over Pt/HY was attributed to the lower amount of coke precursors, which could be hydrogenated by activated H2 over Pt sites. Therefore, Pt on Pt/HY and H2 were two crucial factors in efficiently enhancing the catalytic stability of the HY zeolite for this isomerization reaction.
研究领域:
催化化学
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材料科学
·
石油化工
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOID JOURNAL
·
2015
·Vol. 77
·期 3
·382-389
·
IF 0.789
Yang Zhuoyuan,Miao Yuqing,Xu Lina,Song Guosheng,Zhou Shuang
The nanocomposites of Bi III /Pt nanoparticles (PtNPs) were prepared using an operationally simple method, in which Bi III spontaneously adsorbed onto the surface of PtNPs to form a submonolayer by the strong interactions between Bi III and Pt. The adsorption of Bi III on PtNPs was confirmed by electrochemical studies. Without PtNPs, Bi III did not adsorb directly on the surface of glassy carbon electrode. The specific chemistry resulted in high electrocatalysis performance of the obtained nanocomposites toward glucose oxidation compared with PtNPs alone because of the dual effects of Bi(III). On the one hand, Bi tends to bind OH − from alkaline solution and then to share it with the adjacent Pt atom. This binding leads to an increase in number of hydroxylated Pt centers, which are the active species for the electrochemical oxidation of glucose. On the other hand, Bi acts as a binder to cross-link PtNPs and to immobilize them on the surface of glassy carbon electrode. The fabricated Bi III /PtNP nanocomposites may have the potential applications in the areas of electrocatalysis or electroanalysis.
研究领域:
材料科学
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电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 99
·96809-96815
·
IF 3.289
Hualei Zhang,Qianying Lin,Shangbo Ning,Yangen Zhou,Huaxiang Lin,Jinlin Long,Zizhong Zhang,Xuxu Wang
Mesoporous Pt–Nb2O5 photocatalysts with high photocatalytic hydrogen production activity were synthesized by a one-step method. The mesoporous structure of the as-made samples was characterized by X-ray diffraction, N2 adsorption–desorption isotherms and transmission electron microscopy. Pt–Nb2O5 exhibited higher hydrogen production activity than pure Nb2O5 and 0.8-Pt–D–M–Nb exhibited the best photocatalytic activity. In addition, Pt–Nb2O5 synthesized by a one-step method exhibited higher photocatalytic hydrogen production activity than that prepared by an incipient wetness impregnation method; 0.8-Pt–D–M–Nb exhibits a H2 evolution rate of 9.79 mmol h−1 g−1, while 0.8-Pt–I–M–Nb2O5 exhibits a H2 evolution rate of 7.73 mmol h−1 g−1. The enhanced photocatalytic activity of Pt–Nb2O5 was predominantly attributed to the efficient separation of photoinduced electrons and holes.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Rui Zhou,Bo Tu,Dacheng Xia,Hanping He,Zhiwei Cai,Nan Gao,Gang Chang,Yunbin He
Accurate measurement of dopamine (DA) is of great significance for human health monitoring and disease prevention. Herein, two-dimensional Ti 3 C 2 T x MXene with high performance was prepared by layer liquid exfoliation method and used for the modification of gate electrode. The glassy carbon electrode (GCE) modified with Pt/Ti 3 C 2 T x was used as the gate, and assembled with monolayer graphene channel to form a complete transistor device. The device combines the amplification effect of transistors, good electrical conductivity of Ti 3 C 2 T x MXene and excellent catalytic properties of Pt nanoparticles , showing a low detection limit (50 nM) and a wide detection concentration range (50 nM-9 mM) of DA. Ti 3 C 2 T x MXene not only provides a large number of attachment sites for the deposition of Pt nanoparticles , but also improves the electrical conductivity and hydrophilicity of the electrode material , thus enhancing the sensitivity of the device and facilitating the penetration of the solution to be measured. In addition, Ti 3 C 2 T x MXene is negatively charged, it has a certain electrostatic adsorption effect on protonated DA and electrostatic repulsion effect on negatively charged interfering substances. As a result, the device exhibits good selectivity , which provides a great application prospect for the construction of DA sensing platform.
研究领域:
材料科学
·
生物传感
·
医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·
IF 13.3
Zaihui Du,Longjiao Zhu,Pengfei Wang,Xinyue Lan,Shenghao Lin,Wentao Xu
Realizing high-precise and adjustable regulation of engineering nanozyme is important in nanotechnology. Here, Ag@Pt nanozymes with excellent peroxidase-like and antibacterial effects are designed and synthesized by nucleic acid and metal ions coordination-driven one-step rapid self-assembly. The adjustable NA-Ag@Pt nanozyme is synthesized within 4 min using single-stranded nucleic acid as templates, and peroxidase-like enhancing FNA-Ag@Pt nanozyme is received by regulating functional nucleic acids (FNA) based on NA-Ag@Pt nanozyme. Both Ag@Pt nanozymes that are developed not only has simple and general synthesis approaches, but also can produce artificial precise adjustment and possess dual-functional. Moreover, when lead ion-specific aptamers as FNA are introduced to NA-Ag@Pt nanozyme, the Pb 2+ aptasensor is successfully constructed by increasing electron conversion efficiency and improving the specificity of nanozyme. In addition, both nanozyme has good antibacterial properties, with ~100% and ~85% antibacterial efficiency against Escherichia coli and Staphylococcus aureus , respectively. This work provides a synthesis method of novelty dual-functional Ag@Pt nanozymes and successful application in metal ions detection and antibacterial agents.
研究领域:
纳米技术
·
生物化学
·
医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）