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Multiple metallic dopants in nickel nanoparticles for electrocatalytic oxygen evolution

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Progress in Natural Science:Materials International 2023年第1期33卷 67-73页

作者： Yan Huang Jingrui Han Haibin Wang Lihua Liu Hongyan Liang School of Materials Science and Engineering Tianjin University Key Laboratory of Efficient Utilization of Low and Medium Grade Energy Ministry of Education Tianjin University College of Innovation and Entrepreneurship Shanghai Jianqiao University

Developing efficient oxygen evolution reaction(OER) electrocatalysts is of great importance for sustainable energy conversion and storage. Ni-based catalysts have shown great potential as OER electrocatalysts, but their performance still needs to be improved. Herein, we report the multiple metal doped nickel nanoparticles synthesized via a simple oil phase strategy as efficient OER catalysts. The FeMnMoV–Ni exhibits superior OER performance with an overpotential of 220 mV at 10 mA cm-2and a long-term stability of 250 h in 1 M KOH solution. In situ Raman analysis shows that the NiOOH site works as the active center and multiple metallic dopants facilitate the formation of NiOOH. Mo and V dopants promote the formation of high-valence state of Ni sites, and Mn dopants increase the electrochemical active surface area and expose more active sites. This work provides a novel strategy for catalyst design, which is critical for developing multiple metal doped catalysts.

关键词： Multiple metallic dopants Oxygen evolution Electrocatalysts In situ Raman Nickel

Effects of the sand content of muddy water content on one-dimensional vertical infiltration characteristics and dense layer formation characteristics

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 172-179页

作者： Shouxuan Kang Liangjun Fei Yun Zhong Lihua Liu State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi’an University of TechnologyXi’an 710048China Institute of Water Resources and Hydro-electric Engineering Xi’an University of TechnologyXi’an 710048China Engineering Research Center of Eco-environment in Three Gorges Reservoir Region Ministry of EducationChina Three Gorges UniversityYichang 443002HubeiChina School of Water Conservancy and Hydroelectric Power Hebei University of EngineeringHandan 056038HebeiChina

Muddy water irrigation,an effective water-saving irrigation method,has been widely used in the Yellow River Basin in China.To investigate the effect of sand content on water infiltration and dense layer formation under one-dimensional vertical infiltration of muddy water,muddy water infiltration experiments were performed in the laboratory,and five sand contents of muddy water(S=0%,3%,6%,9%,and 12%)were used.Models were established to describe the relationship between the cumulative infiltration amount[I(t)]and the infiltration duration(t);the relationship among the migration distance of the wetting front(Z),S,and t;the thickness of the sedimentary layer[H(t)];and the relationship between S and t.The results revealed that I(t)and Z decreased significantly with the increase of sand contents,while H(t)increased significantly with the increase of sand contents.I(t)and Z were in the range of 7 cm and 20 cm for each treatment,respectively.The variation in I(t)with t fitted Kostiakov and Philip models,and the coefficients of determination were all greater than 0.99.With the increase in S,the infiltration coefficient gradually decreased,the infiltration index gradually increased,and the sorptivity gradually decreased.The particle composition of the sedimentary layer was similar to that of the argillaceous sediment,and the content of particles with a size of less than 2 mm in the sedimentary layer was lower than that of the argillaceous sediment.Compared with the original soil,the content of particles with a size of less than 0.05 mm and physical clay particles(diameter less than 0.01 mm)in the soil with an infiltration depth of 0-2 cm increased.The retention layer was from the topsoil to the infiltration depth of approximately 2 cm.This study can provide a scientific basis for further research on soil infiltration mechanisms under muddy water.

关键词： muddy water sand content dense layer cumulative infiltration wetting front transport deposit layer thickness

The Comaximal Graphs of Noncommutative Rings

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代数集刊:英文版 2023年第3期30卷 439-448页

作者： Shouqiang Shen Weijun liu lihua Feng School of Applied Science Beijing Information Science and Technology University Beijing100192China School of Mathematics and Statistics HNP-LAMA Central South UniversityChangsha 410083China

For a ring R(not necessarily commutative)with identity,the comaximal graph of R,denoted byΩ(R),is a graph whose vertices are all the nonunit elements of R,and two distinct vertices a and b are adjacent if and only if Ra+Rb=R.In this paper we consider a subgraphΩ_(1)(R)ofΩ(R)induced by R\Uℓ(R),where Uℓ(R)is the set of all left-invertible elements of R.We characterize those rings R for whichΩ_(1)(R)\J(R)is a complete graph or a star graph,where J(R)is the Jacobson radical of R.We investigate the clique number and the chromatic number of the graphΩ_(1)(R)\J(R),and we prove that if every left ideal of R is symmetric,then this graph is connected and its diameter is at most 3.Moreover,we completely characterize the diameter ofΩ_(1)(R)\J(R).We also investigate the properties of R whenΩ_(1)(R)is a split graph.

关键词： comaximal graph noncommutative ring left invertible element split graph

Synergistic phosphorized NiFeCo and MXene interaction inspired the formation of high-valence metal sites for efficient oxygen evolution

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Journal of Materials Science & Technology 2022年第11期106卷 90-97页

作者： Ning Li Jingrui Han Kaili Yao Mei Han Zumin Wang Yongchang liu Lihua Liu Hongyan Liang School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Key Laboratory of Efficient Utilization of Low and Medium Grade Energy Ministry of EducationTianjin UniversityTianjin 300350China College of Innovation and Entrepreneurship Shanghai Jianqiao UniversityShanghai 201306China State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin 300354China

Exploring low-cost,high-performance,and stable electrocatalysts toward the oxygen evolution reaction(OER)is highly desired but remains challenging.Transition metal hydroxide has been wildly utilized as a promising candidate,but practical implementation is impeded by insufficient catalytic activity,easy agglomeration,and poor conductivity.Here,we report that both phosphorization and combination with MXnene can improve the catalysts’intrinsic activity and conductivity.Besides,MXene also prevents the agglomeration of the nanoparticles,resulting in the enhanced exposure of active sites.Experimental char-acterizing and density functional theory simulations revealed that P species can attract electrons to pro-mote the formation of high-valence states of adjacent metal atoms,and coupling MXene support can effectively modulate the electronic structure and optimize the d-band center,which boosts the OER per-formance.Consequently,the optimized NiFeCoP/Mxene catalyst exhibits a low overpotential of 240 mV at a current density of 10 mA cm^(−2),a small Tafel slope of 55 mV dec^(−1),and superior long-term stability of 40 h in 1 M KOH electrolyte,which is superior to other counterparts.

关键词： Transition metal phosphide Ti3C2Tx MXene Electrocatalyst Oxygen evolution

The Spectral Properties of p-Sombor(Laplacian)Matrix of Graphs

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Journal of Mathematical Research with Applications 2023年第3期43卷 277-288页

作者： Hechao liu lihua YOU School of Mathematical Sciences South China Normal University

The Sombor index,which was recently introduced into chemical graph theory,can predict physico-chemical properties of molecules.In this paper,we investigate the properties of (p-)Sombor index from an algebraic viewpoint.The p-Sombor matrix Sp(G) is the square matrix of order n whose (i,j)-entry is equal to ((di)p+(dj)p)1/pif vi～vj,and 0 otherwise,where di denotes the degree of vertex viin G.The matrix generalizes the famous Zagreb matrix(p=1),Sombor matrix (p=2) and inverse sum index matrix (p=-1).In this paper,we find a pair of p-Sombor noncospectral equienergetic graphs and determine some bounds for the p-Sombor(Laplacian) spectral radius.Then we describe the properties of connected graphs with k distinct p-Sombor Laplacian eigenvalues.At last,we determine the Sombor spectrum of some special graphs.As a by-product,we determine the spectral properties of Sombor matrix(p=2),Zagreb matrix(p=1) and inverse sum index matrix(p=-1).

关键词： p-Sombor matrix p-Sombor Laplacian matrix p-Sombor spectrum

BAF45D regulates spinal cord neural stem/progenitor cell fate through the SMAD-PAX6 axis

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Genes & Diseases 2023年第2期10卷 366-369页

作者： Xueying Chen Xiujuan Hu Jing Jiang Jie Tao Lihua Liu Shengyun Fang Yuxian Shen Qingsong Hu Chao liu School of Basic Medical Sciences Anhui Medical UniversityHefeiAnhui 230032China Department of Histology and Embryology Institute of Stem Cell and Tissue EngineeringAnhui Medical UniversityHefeiAnhui 230032China Division of Life Sciences and Medicine University of Science and Technology of ChinaThe First Affiliated Hospital of USTCHefeiAnhui 230001China Institute of Clinical Pharmacology Anhui Medical UniversityHefeiAnhui 230032China Center for Biomedical Engineering and Technology University of MarylandBaltimoreMD 21201USA

Mutations in BRG1-associated factor 45D (BAF45D, also known as double PHD fingers 2 (DPF2)) are linked to Coffin-Siris syndrome (CSS).1 However, the underlying molecular mechanisms remain ill-defined. Here, we identified that wild-type but not CSS-associated BAF45D mutants increased the expression of PAX6,2 a neural stem cell marker, and phosphorylated SMAD3 (p-SMAD3) in spinal cord neural stem cells (NSCs) derived from H9 human embryonic stem cells. Both BAF45D and SMAD3 are required for the induction of p-SMAD3 and PAX6 together with STAT3 and SMAD7 by retinoic acid (RA). In the presence of RA, BAF45D knockdown decreased the expression of genes that regulate stem cell pluripotency. Moreover, the same genes in the spinal cord NSCs had more binding sites with BAF45D than those in H9 cells. Furthermore, Gene Ontology (GO) assay results indicated that BAF45D targets more pathways responsible for stem cell maintenance in NSCs. Finally, BAF45D is associated with BRG1, p-SMAD3, and PAX6. Together, these findings suggest a role for BAF45D in modulating PAX6 expression through SMAD signaling, highlighting the importance of BAF45D in neural stem/progenitor cell fate commitment.

关键词： PAX6 progenitor SMAD

Last glacial terrestrial vegetation record of leaf wax n-alkanols in the northern South China Sea:Contrast to scenarios from longchain n-alkanes

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Acta Oceanologica Sinica 2022年第8期41卷 22-30页

作者： Shengyi Mao Guodong Jia Xiaowei Zhu Nengyou Wu Daidai Wu Hongxiang Guan Lihua Liu CAS Key Laboratory of Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Key Laboratory of Gas Hydrate of Ministry of Natural Resources Qingdao Institute of Marine GeologyQingdao 266237China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

Long-chain n-alkanols and n-alkanes in core sediments from the northern South China Sea(SCS)were measured to make a comparison during terrestrial vegetation reconstruction from~42 ka to~7 ka.The results showed that terrestrial vegetation record from long-chain n-alkanes matched well with previous studies in nearby cores,showing that more C_(4)plants developed during the Last Glacial Maximum(LGM)and C_(3)plants dominated in the interglacial period.However,these scenarios were not revealed by terrestrial vegetation reconstruction using long-chain n-alkanols,which showed C_(3)plant expansion during the LGM.The discrepancy during the interglacial period could be attributed to the aerobic degradation of functionalized long-chain n-alkanols in the oxygen-rich bottom water,resulting in poor preservation of terrestrial vegetation signals.On the other hand,the different advantages of functionalized n-alkanols and non-functional n-alkanes to record local and distal vegetation signals,respectively,may offer a potential explanation for the contradiction during the LGM when the SCS was characterized by low-oxygen deep water.Nevertheless,large variations on n-alkyl lipid compositions in C_(3)/C_(4)plants could play a part in modulating sedimentary long-chain n-alkanols and n-alkanes toward different vegetation signals,thereby suggesting that caution must be taken in respect to the terrestrial vegetation reconstruction using long-chain n-alkanes and long-chain n-alkanols.

关键词： South China Sea long-chain n-alkanols long-chain n-alkanes Last Glacial Maximum terrestrial vegetation record

Effectiveness of Zhuling decoction(猪苓汤) on diuretic resistance in patients with heart failure:a randomized,controlled trial

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Journal of Traditional Chinese Medicine 2022年第3期42卷 439-445页

作者： CHEN Yunhu FAN lihua ZHANG Tao liu Xueqian Department of Cardiovascular Taicang Hospital affiliated with Nanjing University of Traditional Chinese MedicineSuzhou 215400China Department of Cardiovascular Changzhou Hospital affiliated with Nanjing University of Traditional Chinese MedicineChangzhou 213003China

OBJECTIVE:To test the effects of Zhuling decoction(猪苓汤)on patients with diuretic resistance in heart failure compared with a group of patients undergoing conventional treatment alone.METHODS:This research was a prospective,randomized,controlled study.From July 2018 to August 2020,96 diuretic resistance patients from the Cardiovascular Research Center of Taicang Hospital affiliated with Nanjing University of Traditional Chinese Medicine(GradeⅢHospital of Traditional Chinese Medicine)were enrolled in the study.The subjects were randomly divided into an observation group(48 cases)and a control group(48 cases).Patients in both groups received conventional treatment.In addition,observation group patients received Traditional Chinese Medicine Zhuling decoction.The primary endpoint was the urine output mean difference between Day 1 and Day 7 after treatment.Secondary endpoints were the changes over time in the N-terminal pro-B type natriuretic peptide(NTproBNP),New York Heart Association(NYHA)functional classification,and Minnesota Living with Heart Failure Questionnaire(MLHFQ).The safety and tolerability of the drug were comprehensively evaluated based on adverse drug reactions,as well as laboratory-assisted tests for liver and kidney function and electrolytes.RESULTS:Significant improvements were demonstrated for urine output in the two groups at Day 7,with a 1325 vs 1045 mL difference in favor of the observation group(P=0.018).The observation group also had greater improvements in NT-proBNP and NYHA functional classification changes than the control group.At the 30 th day of follow-up,a significant reduction in negative findings on the MLHFQ from baseline was observed in both groups,but the observation group demonstrated a significantly greater reduction than the control group(P<0.001).CONCLUSIONS:Zhuling decoction could be used in combination therapy for patients with diuretic resistance in heart failure in addition to standard treatment.

关键词： heart failure diuretic resistance urine output treatment outcome Zhuling decoction randomized controlled trial

The influence of coupling mode of methane leakage and debris input on anaerobic oxidation of methane

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Acta Oceanologica Sinica 2021年第8期40卷 78-88页

作者： Rui Xie Daidai Wu Jie liu Guangrong Jin Tiantian Sun Lihua Liu Nengyou Wu Key Laboratory of Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 510075China Institution of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China Evaluation and Detection Technology Laboratory of Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao 266071China

Anaerobic oxidation of methane(AOM) is an important biogeochemical process, which has important scientific significance for global climate change and atmospheric evolution. This research examined the δ^(34)S, terrigenous clastic indices of TiO_(2) and Al_(2)O_(3), and times for formation of the Ba front at site SH1, site SH3 and site 973-4 in the South China Sea. Three different coupling mechanisms of deposition rate and methane flux were discovered. The different coupling mechanisms had different effects on the role of AOM. At site 973-4, a high deposition rate caused a rapid vertical downward migration of the sulphate–methane transition zone(SMTZ), and the higher input resulted in mineral dissolution. At site SH3, the deposition rate and methane flux were basically in balance,so the SMTZ and paleo-SMTZ were the most stable of any site, and these were in a slow process of migration. At site SH1, the methane flux dominated the coupled mode, so the movement of the SMTZ at site SH1 was consistent with the general understanding. Understanding the factors influencing the SMTZ is important for understanding the early diagenesis process.

关键词： methane seep terrestrial detrital material anaerobic oxidation of methane gas hydrate