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Nano Research · 2020 ·Vol. 13 ·期 12 ·3206-3211 · IF 8.183

Electrochemical conversion of CO2 to syngas with a wide range of CO/H2 ratio over Ni/Fe binary single-atom catalysts

Zhang Meng,Hu Zheng,Gu Lin,Zhang Qinghua,Zhang Linghui,Song Qian,Zhou Wei,Hu Shi

A series of carbon-based binary single-atom catalysts of Fe and Ni coordinated by nitrogen are fabricated using a glucose-chelating method. Depending on the Ni/Fe content, they exhibit a wide-range of controllable CO/H 2 ratio from 0.14 to 10.86, which is meaningful to specific chemical processes. The durability of the catalyst is evaluated over an 8-hour period with no significant degradation of activity. The variation of the faradaic efficiency with Ni/Fe content is justified by density-functional-theory based calculation of the reaction barrier in both hydrogen evolution and CO 2 reduction reactions.

CAS / MDL: 7782-61-8 13478-00-7 6132-04-3

研究领域: 催化 · 电化学 · 材料科学 · 化学工程

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TALANTA · 2019 · IF 4.916

Facile synthesis of Silicon quantum dot-Gadolinium: A potential fluorescent/T1-T2 multimodal imaging agent

Fangnan Xiao,Yue Xiao,Fangman Chen,Xiaolin Liu,Chentao Lin,Jianxin Chen,Yunkun Wu

Highly stable and multifunctional fluorescent quantum dots are particularly attractive in practical applications. Here, a new kind of ultra-small-sized silicon quantum dot-gadolinium (SiQD-Gd) was successfully fabricated by a newly-designed facile hydrothermal growth and chelating method. The obtained SiQD-Gd exhibited outstanding water dispersibility, stability and good fluorescent property with the quantum yield of 11.6%. SiQD-Gd displayed a low cytotoxicity in normal cell lines (HELF, HEK293F) and tumor cell lines (H1299, A549). Meanwhile, SiQD-Gd showed excellent magnetic resonance response with r 1 relaxation rate of 10.5 mmol L −1 ·s −1 and r 2 relaxation rate of 47.5 mmol L −1 ·s −1 , which are 2.5 and 7.4 times enhanced comparing to that of the commercial MR agent Magnevist. In vivo studies showed significant contrast enhancement effect of its T 1 - and T 2 -weighted MR imaging. In addition, in vivo fluorescent imaging for mice and zebrafish indicated its potential applications in fluorescent tracking. Thus, the excellent multimodal imaging capacity and biocompatibility of SiQD-Gd make it a potential imaging agent for clinic applications.

CAS / MDL: 1336-21-6 64-17-5 79-08-3 19598-90-4 7664-39-3 67-56-1 67-64-1 7647-01-0

研究领域: 材料科学 · 纳米技术 · 医学成像 · 生物医学工程

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Electrochemical conversion of CO2 to syngas with a wide range of CO/H2 ratio over Ni/Fe binary single-atom catalysts

Facile synthesis of Silicon quantum dot-Gadolinium: A potential fluorescent/T1-T2 multimodal imaging agent