ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Na Cheng,Ling Zhang,Shuying Mi,Hao Jiang,Yanjie Hu,Haibo Jiang,Chunzhong Li
Constructing Pt skin on intermetallics has been confirmed as an efficient strategy to boost oxygen reduction reaction (ORR) kinetics. However, there still lacks a systematic study on revealing the influence of low-Pt-content intermetallic substrates (L12-PtM3). In this paper, Pt skin-encapsulated low-Pt-mole-fraction L12 Cu3Pt has been constructed (denoted as Pt-o-Cu3Pt/C) and compared with its disordered analogue (denoted as Pt-d-Cu3Pt/C). The L12 substrate shows a contracted lattice structure and provides Pt-o-Cu3Pt/C with an excellent specific activity of 1.73 mA cm–2, which is 1.4- and 8.4-fold higher than that of Pt-d-Cu3Pt/C and commercial Pt/C, respectively. Density functional theory calculations reveal that this superior performance is attributed to the more favorable oxygen adsorption energy of surface Pt atoms. Furthermore, the lower formation energy of L12 Cu3Pt combined with the enhanced antioxygenation of Pt provide Pt-o-Cu3Pt/C with a superior durability, showing only a 12.5% loss in mass activity after 5000 potential cycles. Therefore, it is suggested that L12 atomic ordered structure with a low Pt fraction is a promising substrate for building high-performance Pt-skin catalysts for ORR.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Bingwang Yang,Ning Han,Liying Zhang,Shasha Yi,Zongtao Zhang,Yu Wang,Ying Zhou,Deliang Chen,Yanfeng Gao
The combination of noble metal and transition metal oxide (TMO) can effectively expand their application in electrochemistry. However, rational design and convenient fabrication of the noble metal/TMO nanoarray is rarely reported. Here, Cu 3 Pt/Cu 2 O nanorod array was constructed on copper substrate by a convenient method and used as non-enzymatic glucose detector. In the nanorod, Moreover, the glycol ligand acted as a bridge for electron transfer from Cu 2 O at surface to Cu 3 Pt and the nanorod structure of Cu 3 Pt could serve as a highway for electron transfer, hence, when the Cu 3 Pt/Cu 2 O nanorod array was used as glucose detector, it delivered enhanced linear detection range (0.005–0.1 mM, 0.1–1.5 mM and 1.5–10 mM), high corresponding sensitivity (5082 μA mM −1 cm −2 , 3331 μA mM −1 cm −2 and 118 μA mM −1 cm −2 ), fast response time (<6 s), low detection limit (1.759 μM, S/N = 3) and high selectivity.
研究领域:
材料科学
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电化学
·
生物传感
✓ 已验证
DOI
高影响因子
Nanoscale Advances
·
2022
·Vol. 5
·期 1
·133-141
·
IF 5.598
Shanshan Wei,Shiyong Li,Haolin Xiao,Feijun Zhao,Jianming Zhu,Zhencheng Chen,Liangli Cao
Gastric cancer (GC) is a common malignant tumour of the digestive tract with a high mortality rate worldwide. However, many patients delay treatment due to the avoidance of the costly and painful procedure of gastroscopy. Therefore, an early convenient screening method is essential to improve the survival rate of GC patients. To address this issue, we constructed an electrochemical immunosensor supported by rhombohedral Cu3Pt and MoS2 nanoflowers (MoS2 NFs) for rapid, painless and quantitative detection of the GC biomarker in vitro. Here, pepsinogen I was employed as a model protein biomarker to analyse the performance of the immunosensor. The rhombohedral dodecahedral Cu3Pt nanoparticles decorated with MoS2-NFs were further functionalized; this allowed the constructed sensor to possess more nano- or micro-structures, thereby improving the detection sensitivity. In specific applications, the corresponding bioactive molecules can be flexibly captured. Under optimal conditions, the immunoassay showed a wide linear range from 500 pg mL−1 to 400 ng mL−1 and a low detection limit of 167 pg mL−1 (S/N = 3). This covers the critical value of 70 ng mL−1, and the results obtained from the analysis of human serum samples were on par with those from the enzyme immunoassay, suggesting significant potential for this new method in daily diagnosis.
研究领域:
生物医学工程
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癌症研究
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Scientific Reports
·
2014
·Vol. 4
·期 1
·1-6
·
IF 5.078
Han Lin,Liu Hui,Cui Penglei,Peng Zhijian,Zhang Suojiang,Yang Jun
Noble metal nanoparticles with hollow interiors and customizable shell compositions have immense potential for catalysis. Herein, we present an unique structure transformation phenomenon for the fabrication of alloy Cu 3 Pt nanoframes with polyhedral morphology. This strategy starts with the preparation of polyhedral Cu-Pt nanoparticles with a core-shell construction upon the anisotropic growth of Pt on multiply twinned Cu seed particles, which are subsequently transformed into alloy Cu 3 Pt nanoframes due to the Kirkendall effect between the Cu core and Pt shell. The as-prepared alloy Cu 3 Pt nanoframes possess the rhombic dodecahedral morphology of their core-shell parents after the structural evolution. In particular, the resulting alloy Cu 3 Pt nanoframes are more effective for oxygen reduction reaction but ineffective for methanol oxidation reaction in comparison with their original Cu-Pt core-shell precursors.
研究领域:
材料科学
·
催化化学
✓ 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）