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Efficient and selective H_(2)O_(2)production through uranyl-assisted photocatalytic oxygen reduction reaction process in a uranium-organic framework

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Science China Chemistry 2024年第7期67卷 2274-2281页

作者： Jianxin Song Chao liang Baoyu li Xuemin Wang Min Lei lisha Jiang zhenyu li Yugang Zhang Jian Xie Zuju Ma Xing Dai Yanlong Wang Shuao Wang Wei liu School of Environmental and Materials Engineering Yantai UniversityYantai 264005China State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China School of life and Environmental Sciences Shaoxing UniversityShaoxing 312000China School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’an 710049China

Harnessing solar energy by photocatalytically converting oxygen and water into high-value-added H_(2)O_(2)is a promising way of alleviating both environmental and energy issues.It is worth noting that suppressing detrimental side reactions,such as the generation of·O_(2)^(-),is a critical approach to enhancing H_(2)O_(2)production.Herein,a 2-fold interpenetrating 3D uranium-organic framework(YTU-W-1)was developed and introduced for photocatalytic H_(2)O_(2)production.The material demonstrates a different photocatalytic mechanism when employing uranyl as an initiator,as compared with the conventional semiconductor photocatalytic pathway involving photo-generated charge carriers.Benefiting from the strong hydrogen abstraction effect of the U≡O·and the direct one-step oxygen reduction pathway,YTU-W-1 exhibits enhanced photocatalytic performance for H_(2)O_(2)production with yield efficiency of 221μmol h-1g-1.Furthermore,YTU-W-1 displays a high H_(2)O_(2)selectivity of 68%,confirmed by rotating ring-disk electrode(RRDE)measurement.DFTcalculations were used to elucidate the critical role of uranyl in the photocatalytic oxygen reduction reaction for H_(2)O_(2)production.This research introduces an innovative approach to photo-driven H_(2)O_(2)production,underscoring the potential for heterogeneous catalysts to engage in photocatalytic reactions independently of photogenerated charge carriers.

关键词： uranyl metal-organic frameworks oxygen reduction reaction photocatalytic H_(2)O_(2)synthesis

Self-Supervised Monocular Depth Estimation via Discrete Strategy and Uncertainty

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IEEE/CAA Journal of Automatica Sinica 2022年第7期9卷 1307-1310页

作者： zhenyu li Junjun Jiang Xianming liu School of Computer Science and Technology Harbin Institute of TechnologyHarbin 150001 Peng Cheng Laboratory Shenzhen 518052China

Dear Editor,This letter is concerned with self-supervised monocular depth estimation.To estimate uncertainty simultaneously,we propose a simple yet effective strategy to learn the uncertainty for self-supervised monocular depth estimation with the discrete strategy that explicitly associates the prediction and the uncertainty to train the networks.Furthermore,we propose the uncertainty-guided feature fusion module to fully utilize the uncertainty information.Codes will be available at https://***/zhyever/Monocular-Depth-Estimation-Toolbox.Self-supervised monocular depth estimation methods turn into promising alternative trade-offs in both the training cost and the inference performance.However,compound losses that couple the depth and the pose lead to a dilemma of uncertainty calculation that is crucial for critical safety systems.To solve this issue,we propose a simple yet effective strategy to learn the uncertainty for self-supervised monocular depth estimation using the discrete bins that explicitly associate the prediction and the uncertainty to train the networks.This strategy is more pluggable without any additional changes to self-supervised training losses and improves model performance.Secondly,to further exert the uncertainty information,we propose the uncertainty-guided feature fusion module to refine the depth estimation.

关键词： estimation utilize uncertainty

DepthFormer:Exploiting Long-range Correlation and Local Information for Accurate Monocular Depth Estimation

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Machine Intelligence Research 2023年第6期20卷 837-854页

作者： zhenyu li Zehui Chen Xianming liu Junjun Jiang Faculty of Computing Harbin Institute of TechnologyHarbin150001China Department of Automation University of Science and Technology of ChinaHefei230026China

This paper aims to address the problem of supervised monocular depth estimation.We start with a meticulous pilot study to demonstrate that the long-range correlation is essential for accurate depth estimation.Moreover,the Transformer and convolution are good at long-range and close-range depth estimation,respectively.Therefore,we propose to adopt a parallel encoder architecture consisting of a Transformer branch and a convolution branch.The former can model global context with the effective attention mechanism and the latter aims to preserve the local information as the Transformer lacks the spatial inductive bias in modeling such contents.However,independent branches lead to a shortage of connections between features.To bridge this gap,we design a hierarchical aggregation and heterogeneous interaction module to enhance the Transformer features and model the affinity between the heterogeneous features in a set-to-set translation manner.Due to the unbearable memory cost introduced by the global attention on high-resolution feature maps,we adopt the deformable scheme to reduce the complexity.Extensive experiments on the KITTI,NYU,and SUN RGB-D datasets demonstrate that our proposed model,termed DepthFormer,surpasses state-of-the-art monocular depth estimation methods with prominent margins.The effectiveness of each proposed module is elaborately evaluated through meticulous and intensive ablation studies.

关键词： Autonomous driving 3D reconstruction monocular depth estimation Transformer convolution

Self-sacrificial templating synthesis of flower-like nickel phyllosilicates and its application as high-performance reinforcements in epoxy nanocomposites

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Frontiers of Chemical Science and Engineering 2022年第4期16卷 484-497页

作者： Jinian Yang Xuesong Feng Shibin Nie Yuxuan Xu zhenyu li School of Materials Science and Engineering State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainan 232001China School of Safety Science and Engineering State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainan 232001China

The nanocomposites of flower-like nickel phyllosilicate particles incorporated into epoxy resin were fabricated via an in-situ mixing process.The flower-like nickel phyllosilicate particles were firstly synthesized using a mild self-sacrificial templating method,and the morphology and lamellar structure were examined carefully.Several properties of mechanical,thermal and tribological responses of epoxy nanocomposites were performed.It was demonstrated that adequate flower-like nickel phyllosilicate particles dispersed well in the matrix,and the nanocomposites displayed enhanced tensile strength and elastic modulus but decreased elongation at break as expected.In addition,friction coefficient and wear rate were increased first and then decreased along with the particle content,and showed the lowest values at a mass fraction of 5%.Nevertheless,the incorporated flower-like nickel phyllosilicate particles resulted in the continuously increasing thermal stability of epoxy resin(EP)nanocomposites.This study revealed the giant potential of flower-like particles in preparing high-quality EP nanocomposites.

关键词： nickel phyllosilicate flow-like structure mechanical property thermal stability tribological performance

Understanding enhancing mechanism of Pr_(6)O_(11) and Pr(OH)_(3) in methanol electrooxidation

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Journal of Rare Earths 2022年第1期40卷 85-92页

作者： Yang Yang zhenyu li Ying Yu Xueqiong Zhang Hang Wei Haibin Chu Inner Mongolia Engineering and Technology Research Center for Catalytic Conversion and Utilization of Carbon Resource Molecules College of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot 010021China

The presence of oxygen vacancies and hydroxyl groups are both favorable for the methanol electrooxidation on Pt-based catalysts.Understanding and differentiating the enhancing mechanism between oxygen vacancies and hydroxyl groups for high activity of Pt catalysts in methanol oxidation reaction(MOR)is essential but still challenging.Herein,we developed two kinds of co-catalyst for Pt/CNTs,Pr_(6)O_(11)is rich in oxygen vacancies but contains substantially no hydroxyl groups,while Pr(OH)_(3) possesses abundant hydroxyl groups without oxygen vacancies.After a seque nce of designed experiments,it can be found that both oxygen vacancies and hydroxyl groups can improve the performance of Pt/CNTs electrocatalysts,but the enhancing mechanism and improving degree of oxygen vacancies and hydroxyl groups for the MOR are different.Since the oxygen vacancies are more conducive to increasing the intrinsic activity of the Pt catalyst,and the hydroxyl groups play a decisive role in dehydrogenation and deproto nation of methanol,the co-catalysts with both oxygen vacancies and hydroxyl groups mixed with Pt/CNTs have higher catalytic performance.Therefore,hydroxyl-rich Pr_(6)O_(11)·xH_(2)O was prepared and used as MOR electrocatalyst after mixed with Pt/CNTs.Benefiting from the synergistic effect of oxygen vacancies and hydroxyl groups,the Pr_(6)O_(11)·xH_(2)O/Pt/CNTs shows a high peak current density of 741 mA/mg,which is three times higher than that of Pt/CNTs.These new discoveries serve as a promising strategy for the rational design of MOR catalysts with low cost and high activity.

关键词： Oxygen vacancies Hydroxyl groups Pr_(6)O_(11) Pr(OH)_(3) Methanol oxidation reaction Rare earths

Roles of hydroxyl and oxygen vacancy of CeO_(2)·xH_(2)O in Pd-catalyzed ethanol electro-oxidation

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Science China Chemistry 2022年第5期65卷 877-884页

作者： zhenyu li Jiefei li Zexuan Zheng Kunhong Jiang Tianrun Zheng Dongmin Wang Hang Wei Zhiming Shi Xiaotian li Haibin Chu College of Chemistry and Chemical Engineering Inner Mongolia Engineering and Technology Research Center for Catalytic Conversion and Utilization of Carbon Resource MoleculesInner Mongolia UniversityHohhot 010021China College of Materials Science and Engineering Jilin UniversityChangchun 130022China College of Chemistry Jilin UniversityChangchun 130012China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

In the field of noble metal-catalyzed alcohol electro-oxidation reaction(AOR),huge attention is paid on the composition,size,facet,and structure of the metals,while the support engineering should also be emphasized.CeO_(2)has been widely used as a unique support in AOR,primarily due to its abundant oxygen vacancies(O_(v)).Herein,we report CeO_(2)·xH_(2)O nanoparticles with both massive hydroxyl groups(OH)and O_(v)remarkably enhance the catalytic activity and stability of Pd toward ethanol oxidation reaction(EOR).The CO striping experiments and density functional theory(DFT)calculations suggest that OH and O_(v)on CeO_(2)·xH_(2)O surface bring about a large downshift of Pd d-band center and a significant weakening of CO absorption on Pd.Moreover,OH and O_(v)also play synergic roles in the removal of toxic intermediates.Consequently,the important roles of OH and O_(v)of CeO_(2)·xH_(2)O are confirmed in Pd-catalyzed EOR.The facile CeO_(2)·xH_(2)O-enhanced strategy can contribute to the catalyst design for other energy conversion reactions.

关键词： electrocatalysis ceria hydroxyl oxygen vacancy ethanol oxidation reaction

The application of internal suspension technique in retroperitoneal robot-assisted laparoscopic partial nephrectomy with a new robotic system KangDuo Surgical Robot-01:Initial experience

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Asian Journal of Urology 2023年第4期10卷 482-487页

作者： Silu Chen Shubo Fan Hua Guan Kunlin Yang Zhihua li Shengwei Xiong Xiang Wang zhenyu li Cheng Shen liqun Zhou Xuesong li Department of Urology Peking University First HospitalInstitute of UrologyPeking UniversityNational Urological Cancer CenterXicheng DistrictBeijingChina

Objective To assess the feasibility of internal suspension technique in retroperitoneal robot-assisted laparoscopic partial nephrectomy(rRAPN)with a new robotic platform called KangDuo Surgical Robot-01(KD-SR-01)system(Suzhou KangDuo Robot Co.,Ltd.,Suzhou,China)and discuss its surgical technique.Methods A 44-year-old male patient was admitted with a 2.5 cm tumor on dorsolateral upper pole of the left kidney.The R.E.N.A.L.nephrometry score of this patient was 4x.This patient underwent rRAPN with KD-SR-01.The perinephric fat between the tumor and Gerota's fascia was preserved,which was used for internal suspension traction during tumor resection.Postoperative follow-up data were collected.Results The surgery was successfully carried out with a duration of 127 min,in which the docking time was 6 min 25 s and console time was 60 min.The warm ischemia time was 19 min 53 s,and the estimated blood loss was 0 mL.The pathological histology showed a pathological tumor stage 1a clear cell renal cell carcinoma,with a negative surgical margin.The World Health Organization/International Society of Urological Pathology(WHO/ISUP)grade of this patient was Grade 2.No recurrence was observed during the 6-month follow-up.Conclusion Internal suspension in rRAPN is feasible and effective with use of the new robotic system KD-SR-01.

关键词： KangDuo Surgical Robot-01 Internal suspension Partial nephrectomy Retroperitoneal approach

Robotic urologic surgery using the KangDuo-Surgical Robot-01 system:A single-center prospective analysis

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Chinese Medical Journal 2023年第24期136卷 2960-2966页

作者： Shengwei Xiong Shubo Fan Silu Chen Xiang Wang Guanpeng Han Zhihua li Wei Zuo zhenyu li Kunlin Yang Zhongyuan Zhang Cheng Shen liqun Zhou Xuesong li Department of Urology Peking University First HospitalBeijing 100034China Institute of Urology Peking UniversityBeijing 100034China National Urological Cancer Center Beijing 100034China

Background:The KangDuo-Surgical Robot-01(KD-SR-01)system is a new surgical robot recently developed in China.The aim of this study was to present our single-center experience and mid-term outcomes of urological procedures using the KD-SR-01 system.Methods:From August 2020 to April 2023,consecutive urologic procedures were performed at Peking University First Hospital using the KD-SR-01 system.The clinical features,perioperative data,and follow-up outcomes were prospectively collected and analyzed.Results:A total of 110 consecutive patients were recruited.Among these patients,28 underwent partial nephrectomy(PN),41 underwent urinary tract reconstruction(26 underwent pyeloplasty,3 underwent ureteral reconstruction and 12 underwent ureterovesical reimplantation[UR]),and 41 underwent radical prostatectomy(RP).The median operative time for PN was 112.5 min,157.0 min for pyeloplasty,151.0 min for ureteral reconstruction,142.5 min for UR,and 138.0 min for RP.The median intraoperative blood loss was 10 mL for PN,10 mL for pyeloplasty,30 mL for ureteral reconstruction,20 mL for UR,and 50 mL for RP.All procedures were successfully completed without conversion,and there were no major complications in any patient.The median warm ischemia time of PN was 17.3 min,and positive surgical margin was not noted in any patient.The overall positive surgical margin rate of RP was 39%(16/41),and no biochemical recurrence was observed in any RP patient during the median follow-up of 11.0 months.The surgical success rates of pyeloplasty and UR were 96%(25/26)and 92%(11/12)during the median follow-up of 29.5 months and 11.5 months,respectively.Conclusion:The KD-SR-01 system appears feasible,safe,and effective for most urological procedures,based on our single-center experience.

关键词： Robotics KangDuo-Surgical Robot-01 Partial nephrectomy Urinary tract reconstruction Radical prostatectomy

High-performance fiber strain sensor of carbon nanotube/thermoplastic polyurethane@styrene butadiene styrene with a double percolated structure

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Frontiers of Materials Science 2022年第1期16卷 99-110页

作者： Dong XIANG libing liU Xiaoyu CHEN Yuanpeng WU Menghan WANG Jie ZHANG Chunxia ZHAO Hui li zhenyu li Ping WANG Yuntao li School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China College of Materials Science and Engineering Chongqing UniversityChongqing 400030China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China The Center of Functional Materials for Working Fluids of Oil and Gas Field Southwest Petroleum UniversityChengdu 610500China

In this work,a high-performance fiber strain sensor is fabricated by constructing a double percolated structure,consisting of carbon nanotube(CNT)/thermoplastic polyurethane(TPU)continuous phase and styrene butadiene styrene(SBS)phase,incompatible with TPU(CNT/TPU@SBS).Compared with other similar fiber strain sensor systems without double percolated structure,the CNT/TPU@SBS sensor achieves a lower percolation threshold(0.38 wt.%)and higher electrical conductivity.The conductivity of 1%-CNT/TPU@SBS(4.12×10^(-3) S·m^(-1))is two orders of magnitude higher than that of 1%-CNT/TPU(3.17×10^(-5) S·m^(-1))at the same CNT loading of 1 wt.%.Due to double percolated structure,the 1%-CNT/TPU@SBS sensor exhibits a wide strain detection range(0.2%-100%)and an ultra-high sensitivity(maximum gauge factor(GF)is 32411 at 100%strain).Besides,the 1%-CNT/TPU@SBS sensor shows a high linearity(R^(2)=0.97)at 0%-20%strain,relatively fast response time(214 ms),and stability(500 loading/unloading cycles).The designed sensor can efficiently monitor physiological signals and movements and identify load distribution after being woven into a sensor array,showing broad application prospects in wearable electronics.

关键词： double percolated structure strain sensor fiber carbon nanotube nanocomposite