检索结果-南通市图书馆

Single-atom Co alloyed Ru for electrocatalytic nitrite reduction to ammonia

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第5期17卷 3660-3666页

作者： Fuzhou Wang Jiaqi Xiang Guike Zhang Kai Chen ke chu School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China

Electrochemical converting NO_(2)^(-)into NH_(3)(NO_(2)RR)holds an enormous prospect to attain efficient NH_(3) electrosynthesis and polluted NO_(2)^(-)mitigation.Herein,we report single-atom Co alloyed Ru(Co_(1)Ru)as an efficient and durable NO_(2)RR catalyst.Extensive experimental and theoretical investigations reveal that single-atom Co alloying of Ru enables the construction of Co_(1)-Ru heteronuclear active sites to synergistically promote NO_(2)^(-)activation/hydrogenation while suppressing the competitive H_(2) evolution,rendering the greatly enhanced activity and selectivity of Co_(1)Ru towards the NO_(2)RR.Consequently,Co_(1)Ru assembled within a flow cell exhibits an impressive NH_(3) yield rate of 2379.2μmol·h^(-1)·cm^(-2) with an NH_(3)-Faradaic efficiency of 92%at a high current density of 415.9 mA·cm^(-2),which is among the highest NO_(2)RR performances reported to date.

关键词： electrochemical converting NO_(2)-into NH3 single-atom alloys theoretical computations industrial-level current density

S1-supported Pd@CeO_(2) quasi-core@shell materials as advanced catalysts for selective hydrogenation of furfural

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第3期35卷 493-496页

作者： Xiang chu Lingling Zhang ke Wang Rui Zhang Xiao Wang Shuyan Song Hongjie Zhang State key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

Bare Pd metal nanoparticles invariably suffer from poor selectivity in furfural hydrogenation by forming flat configurations,with the aromatic ring of the substrate molecules parallel to the metal surface.Herein,we put forward a promising solution by using CeO_(2)as promoters to modify Pd nanoparticles for modulating the adsorption behaviors of furfural molecules.To achieve the highly-desired ultra-small Pd@CeO_(2)core@shell nanostructure,a“constrained auto-redox”synthesis is developed,in which silicalite-1 supports play the key role of providing their surface as the landing place of PdO_(x)precursors for inhibiting the overgrowth and the deformation.To the best of our knowledge,this is one of the smallest core@shell materials obtained from aqueous synthesis.When evaluated as catalysts,Pd@CeO_(2)/S-1 gives 98.9%conversion of furfural with 94.3%selectivity for furfural alcohol in 15 h,which is much better than that of Pd/S-1(88.6%conversion with 44.3%selectively).The DFT simulation reveals a strong interaction between the defects of CeO_(2)and the oxygen atom of the–CHO group in furfural molecules,which benefits the selective hydrogenation occurred in the–CHO group rather than the furan ring.

关键词： Core@shell Palladium Ceria Auto-redox synthesis Hydrogenation

Wide Stopband Substrate Integrated Waveguide Filter Using Bisection and Trisection Coupling in Multilayer

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2024年第2期33卷 436-442页

作者： Peng chu Jianguo FENG Peng ZHU Lei GUO Long ZHANG Leilei LIU Guoqing LUO ke WU College of Electronic and Optical Engineering Nanjing University of Posts and Telecommunications National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology School of Information and Communication Engineering Dalian University of Technology Guangdong Provincial key Laboratory of Optoelectronic Information Processing Chips and Systems Sun Yat-sen University College of Electronics and Information Engineering Shenzhen University School of Electronics and Information Hangzhou Dianzi University Poly-Grames Research Center Polytechnique Montreal

This article presents a highly efficient method for substrate-integrated-waveguide（SIW） filters to achieve very wide stopbands. By employing the proposed trisection slots in addition to the bisection slots as the inter-coupling structures, all spurious modes below TE505 of a SIW filter working in the fundamental mode TE101（f0）can be eliminated without requiring additional structure or complex theoretical analysis, without affecting the design of the fundamental passbands, and without degrading the performance of the filters. For verification, two prototype filters are designed, fabricated, and measured with wide stopbands up to 4.15f0 and 4.83f0, respectively. The proposed technique could facilitate the development of high-performance wide-stopband SIW filters for microwave/wireless circuits and systems.

关键词： Bandpass filter Wide stopband Substrate integrated waveguide Spurious mode suppression Multilayer

Boron Nitride Quantum Dots/Ti_(3)C_(2)T_(x)-MXene Heterostructure For Efficient Electrocatalytic Nitrogen Fixation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2022年第4期5卷 1303-1309页

作者： ke chu Xingchuan Li Ye Tian Qingqing Li Yali Guo School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Department of Physics College of ScienceHebei North UniversityZhangjiakou 075000China

Electrocatalytic N_(2) fixation through N_(2) reduction reaction(NRR)has been regarded as a promising route for sustainable NH_(3) synthesis,while exploring high-performing NRR catalysts is pivotal yet challenging.Herein,BN quantum dots/Ti_(3)C_(2)T_(x)-MXene(BNQDs/Ti_(3)C_(2)T_(x))heterostructure is demonstrated as an efficient and durable NRR catalyst,exhibiting a high NH_(3) yield of 52.8±3.3μg h^(-1) mg^(-1) with an FE of 19.1±1.6%at0.4 V(vs.RHE),which stand at the high level among all reported BN-and MXene-based NRR catalysts.Theoretical computations reveal that the electronic interactions between BNQDs and Ti_(3)C_(2)T_(x) enrich the electron density of B atoms at the heterointerface and endow them with enhanced electron-donating capability for N_(2) activation and protonation.Meanwhile,the decorated BNQDs can block the active sites of Ti_(3)C_(2)T_(x) for hydrogen evolution,rendering a high N_(2)-to-NH_(3) selectivity.

关键词： Boron nitride quantum dots Density functional theory Electrocatalytic nitrogen fixation MXene

Iridium single-atom catalyst for highly efficient NO electroreduction to NH_(3)

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 8737-8742页

作者： Kai Chen Guohui Wang Yali Guo Dongwei Ma ke chu School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China key Laboratory for Special Functional Materials of Ministry of Education School of Materials Science and EngineeringHenan UniversityKaifeng 475004China

Atomically dispersed Ir confined in amorphous MoO_(3)(Ir1/a-MoO_(3))was designed as a high-efficiency catalyst for electrochemical reduction reaction of NO to NH_(3)(NORR).Atomic precise characterizations reveal that isolated Ir atoms are immobilized in Ovacancies of amorphous MoO_(3) to form Ir_(1)-O_(5) moieties.Theoretical computations demonstrate that single-site Ir1-O5 can not only powerfully activate and hydrogenate NO with a near-zero energy barrier,but also exhibit a higher affinity to NO over H adatoms to suppress the competing hydrogen evolution and promote both NORR activity and selectivity.Consequently,Ir_(1)/a-MoO_(3) shows the maximum NH_(3)yield rate of 438.8μmol·h^(-1)·cm^(-2) and NH_(3)-Faradaic efficiency of 93.2%,representing one of the most efficient NORR catalysts to date.

关键词： electrochemical reduction of NO to NH_(3) single-atom catalysts amorphous materials theoretical calculations

MXene Quantum Dots/Copper Nanocomposites for Synergistically Enhanced N_(2)Electroreduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2023年第1期6卷 192-198页

作者： Yonghua Cheng Xingchuan Li Peng Shen Yali Guo ke chu School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China

Electrocatalytic N_(2) reduction reaction(NRR)represents an appealing solution for sustainable ammonia production,whereas exploring high-efficiency NRR catalysts is highly desired but extremely challenging.Herein,we combine Ti_(3) C_(2)T_(x)-MXene quantum dots(MQDs)with porous Cu nanosheets to design a novel heterostructured MQDs/Cu as an effective and durable NRR catalyst.Impressively,MQDs/Cu showed a synergistically enhanced NRR activity with an NH_(3) yield of 78.5 lg h^(-1) mg^(-1)(-0.5 V)and a Faradaic efficiency of 21.3%(-0.4 V),far superior to pure MQDs and Cu,and outperforming the majority of the state-of-the-art NRR catalysts.Density function theory computations demonstrated that the synergy of MQDs and Cu enabled the creation of interfacial Cu-Ti dimer as dual-active-centers to strongly activate the absorbed N 2 and promote the*N_(2)H formation,consequently resulting in the much reduced energy barriers and greatly enhanced NRR performance.

关键词： density functional theory electrocatalytic nitrogen fixation heterostructure MXene quantum dots

Electrochemical NO reduction to NH3 on Cu single atom catalyst

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第4期16卷 5857-5863页

作者： Kai Chen Guike Zhang Xiaotian Li Xiaolin Zhao ke chu School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China National Engineering Laboratory for Electric Vehicles Beijing Institute of TechnologyBeijing 100081China

Electrochemical NO reduction reaction(NORR)to generate NH_(3)emerges as a fascinating approach to achieve both NO pollution mitigation and sustainable NH_(3)synthesis.Herein,we demonstrate that single-atomic Cu anchored on MoS_(2)(Cu_(1)/MoS_(2))comprising Cu_(1)-S_(3)motifs can serve as a highly efficient NORR catalyst.Cu1/MoS_(2)exhibits an NH_(3)yield rate of 337.5μmol·h^(−1)·cm^(−2)with a Faradaic efficiency of 90.6%at−0.6 V vs.reversible hydrogen electrode(RHE).Combined experiments and theoretical calculations reveal that Cu1-S3 motifs enable the effective activation and hydrogenation of NO through a mixed pathway and simultaneously retard proton coverage,contributing to the high activity and selectivity of Cu1/MoS_(2)for the NORR.

关键词： electrochemical NO reduction to NH_(3) Cu single-atom catalyst theoretical calculations

Sulfur-deficient Bi_(2)S_(3-x) synergistically coupling Ti_(3)C_(2)T_(x)-MXene for boosting electrocatalytic N_(2) reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2022年第5期15卷 3991-3999页

作者： Yaojing Luo Peng Shen Xingchuan Li Yali Guo ke chu School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China

Electrocatalytic nitrogen reduction reaction(NRR)is an appealing route for the sustainable NH_(3)synthesis,while developing efficientand durable NRR catalysts remains at the heart of achieving high-efficiency N_(2)-to-NH_(3)electrocatalysis.Herein,we rationally combine vacancy and interface engineering to design sulfur-deficient Bi2S3 nanoparticles decorated Ti_(3)C_(2)T_(x)-MXene as an effective NRR catalyst.The developed Bi2S3 nanoparticles decorated Ti_(3)C_(2)T_(x)-MXene(Bi2S3-xTi_(3)C_(2)T_(x))naturally contained abundant S-vacancies and exhibited a dramatically boosted NRR activity with an NH_(3)yield of 68.3μg·h^(-1)mg^(-1)(-0.6 V)and a Faradaic efficiency of 22.5%(-0.4 V),far superior to pure Bi_(2)S_(3)and Ti_(3)C_(2)T_(x)and surpassing almost all ever reported Bi-and MXene-based NRR catalysts.Theoretical investigations unveiled that the exceptional NRR activity of Bi_(2)S_(3-x)/Ti_(3)C_(2)T_(x)stemmed from its dual-active-center system involving both S-vacancies and interfacial-Bi sites,which could synergistically promote N_(2)adsorption and*N_(2)H formation to result in an energetic-favorable NRR process.

关键词： electrocatalytic nitrogen reduction bismuth catalyst MXene vacancy engineering interface engineering

Bile acids inhibit ferroptosis sensitivity through activating farnesoid X receptor in gastric cancer cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第5期30卷 485-498页

作者： chu-Xuan Liu Ying Gao Xiu-Fang Xu Xin Jin Yun Zhang Qian Xu Huan-Xin Ding Bing-Jun Li Fang-ke Du Lin-chuan Li Ming-Wei Zhong Jian-Kang Zhu Guang-Yong Zhang Department of General Surgery Shandong Provincial Qianfoshan HospitalShandong UniversityJinan 250014Shandong ProvinceChina Department of General Surgery Linyi People's HospitalLinyi 276034Shandong ProvinceChina Department of Nursing Huantai TCM HospitalZibo 256400Shandong ProvinceChina Center for Translational medical Research The First Affiliated Hospital of Shandong First Medical UniversityJinan 250014Shandong ProvinceChina Department of General Surgery The First Affiliated Hospital of Shandong First Medical UniversityJinan 250014Shandong ProvinceChina

BACKGROUND Gastric cancer(GC)is associated with high mortality rates.Bile acids(BAs)reflux is a well-known risk factor for GC,but the specific mechanism remains unclear.During GC development in both humans and animals,BAs serve as signaling molecules that induce metabolic reprogramming.This confers additional cancer phenotypes,including ferroptosis sensitivity.Ferroptosis is a novel mode of cell death characterized by lipid peroxidation that contributes universally to malignant progression.However,it is not fully defined if BAs can influence GC progression by modulating ferroptosis.AIM To reveal the mechanism of BAs regulation in ferroptosis of GC cells.METHODS In this study,we treated GC cells with various stimuli and evaluated the effect of BAs on the sensitivity to ferroptosis.We used gain and loss of function assays to examine the impacts of farnesoid X receptor(FXR)and BTB and CNC homology 1(BACH1)overexpression and knockdown to obtain further insights into the molecular mechanism involved.RESULTS Our data suggested that BAs could reverse erastin-induced ferroptosis in GC cells.This effect correlated with increased glutathione(GSH)concentrations,a reduced GSH to oxidized GSH ratio,and higher GSH peroxidase 4(GPX4)expression levels.Subsequently,we confirmed that BAs exerted these effects by activating FXR,which markedly increased the expression of GSH synthetase and GPX4.Notably,BACH1 was detected as an essential intermediate molecule in the promotion of GSH synthesis by BAs and FXR.Finally,our results suggested that FXR could significantly promote GC cell proliferation,which may be closely related to its anti-ferroptosis effect.CONCLUSION This study revealed for the first time that BAs could inhibit ferroptosis sensitivity through the FXR-BACH1-GSHGPX4 axis in GC cells.This work provided new insights into the mechanism associated with BA-mediated promotion of GC and may help identify potential therapeutic targets for GC patients with BAs reflux.

关键词： Gastric cancer Ferroptosis Bile acids Chenodeoxycholic acid Farnesoid X receptor Glutathione