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Tailoring interfacial electron redistribution of Ni/Fe_(3)O_(4) electrocatalysts for superior overall water splitting

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Journal of Energy Chemistry 2022年第10期31卷 330-338,I0008页

作者： Wenli Xu wenda zhong Chenfan Yang Rong Zhao Jing Wu Xuanke Li Nianjun Yang Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan UniversityChangsha 410082HunanChina Institute of Materials Engineering University of SiegenSiegen 57076Germany

Exploring highly active earth-abundant bifu nctional electrocatalysts for water splitting at a high output is essential for the forthcoming hydrogen economy.Non-noble Fe_(3)O_(4) catalyst owns outstanding conductivity and its octahedral Fe sites can markedly promote water dissociation.However,it lacks active centers on the surface,resulting in its poor activity when used as a catalyst for hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Herein,an electron redistribution strategy is proposed by introducing Ni sites onto the surface of Fe_(3)O_(4)(Ni/Fe_(3)O_(4)).The abundant delocalized electrons,derived from the electronic interaction of Ni and Fe_(3)O_(4) species,significantly optimize the electronic structure of the Ni/Fe_(3)O_(4) catalyst,leading to its improved adsorption behavior.This Ni/Fe_(3)O_(4) catalyst exhibits remarkable bifunctional activity,steadily outputting 1000 mA cm^(-2)at the low overpotential of 387 mV for HER and 338 mV for OER,respectively.Using Ni/Fe_(3)O_(4) as a bifunctional catalyst for overall water splitting reaction exhibits the optimal performance with outstanding stability,obtaining a current density of1000 mA cm^(-2)at 1.98 V,much superior to a Pt/C‖IrO_(2)cell.Experimental analysis and theoretical calculations collectively corroborate that the electron redistribution of Fe_(3)O_(4) is activated by coupling Ni species,leading to the promoted HER and OER kinetics.This electron redistribution strategy provides an effective method to activate transition metal-based catalysts which are promising to be utilized as superior electrocatalysts for the industrial overall water splitting reaction.

关键词： Electron redistribution Ni/Fe_(3)O_(4)heterojunction Overall water splitting

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Tailoring synergetic catalytic interface of VPO/Ni_(2)P to boost hydrogen evolution under alkaline conditions

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Journal of Energy Chemistry 2022年第2期31卷 674-680页

作者： Wenli Xu Qiqi Li wenda zhong Bing Sun Qiang Huang Xu Nan Yinhong Gao Yao Yang Qin Zhang Nianjun Yang Xuanke Li School of Chemistry and Chemical Engineering Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan UniversityChangsha 410082HunanChina Institute of Materials Engineering University of SiegenSiegen 57076Germany

Design of the catalyst for efficient water dissociation and hydrogen recombination is paramount in enhancement of the alkaline water electrolysis kinetics.Herein,we reported a delicate hierarchical(VO)_(2) P_(2)O_(7)-Ni_(2) P@NF(VPO-Ni_(2) P@NF)hybrid catalyst that operated efficiently in alkaline media.The VPO and Ni_(2) P respectively act as the water dissociation promoter and the hydrogen recombination center,which synergistically propel water adsorption/dissociation and H intermediates recombination.The resulting synergistic interfaces between VPO and Ni_(2) P are verified to afford the catalyst an outstanding performance for hydrogen evolution reaction in alkaline media with an overpotential of 154 mV at 10 mA cm^(-2),Tafel slope of 65 mV dec^(-1),and remarkable durability.Furthermore,the catalyst presents the potential for overall water splitting.This work may shed fresh light on the high-performance electrocatalyst design and the application of VPO on water electrolysis.

关键词： Alkaline water electrolysis Interface engineering (VO)_(2)P_(2)O_(7) Ni_(2)P

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Interfacial electron rearrangement: Ni activated Ni(OH)_(2) for efficient hydrogen evolution

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Journal of Energy Chemistry 2021年第10期30卷 236-242,I0007页

作者： wenda zhong Wenlong Li Chenfan Yang Jing Wu Rong Zhao Memona Idrees Hui Xiang Qin Zhang Xuanke Li Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology College of Materials Science and EngineeringHunan UniversityChangsha 410082HunanChina Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials School of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan 430081HubeiChina

The rational modulation of electronic structure is highly desirable to develop an efficient alkaline hydrogen evolution reaction(HER)catalyst for renewable energy applications.Metal hydroxide such as Ni(OH)_(2) has been proven useful for promoting alkaline HER,but the performance remains unsatisfactory.Herein,the electronic structure of Ni(OH)_(2) is modulated by the interfacial electron rearrangement between Ni-Ni(OH)_(2) heterojunction.Combined experiments with DFT simulations,the electrons of Ni species accumulate to the interfacial Ni-Ni(OH)_(2) sites,which modifies the d band center for promoting conversion of hydrogen intermediates and narrows the energy gap for boosting charge transfer in the HER process.Thus,the integrated electrode exhibits an efficient HER performance to drive10 mA cm^(-2) at the overpotential of 72 mV with a low Tafel slope of 43 mV dec^(-1).Our work renders a valuable insight for understanding and rationally designing efficient catalysts in alkaline HER.

关键词： Electron rearrangement Hydrogen evolution Ni(OH)_(2) Ni Heterojunction

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Vertical distribution of plant nematodes in an aquic brown soil under different land uses

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Journal of Forestry Research 2005年第1期16卷 39-42,i003页

作者： MENGFan-xiang LiangWen-ju OUWei JIANGYong LIQi wenda-zhong InstttuteofApphedEcology ChineseAcademyofSciencesShenyang110016P.R.China／／GraduateSchooloftheChineseAcademyofSciencesBeijing100039P.R.China InstttuteofApphedEcology ChineseAcademyofSciencesShenyang110016P.R.China

The vertical distribution of the dominant genera of plant nematodes at the depth of 0–150 cm of an aquic brown soil were studied for four land use patterns, i.e., paddy field, maize field, fallow field and woodland in the Shenyang Experimental Station of Ecology, Chi- nese Academy of Sciences in November of 2003. The results showed that the numbers of some dominant genera under different land uses decreased with the increase of soil depth. Helicotylenchus was most dominant genus under each land use type. Genera of Filenchus, Psilen- chus and Tylenchus in paddy field occurred at the depth of 0–20 cm; while Paratylenchus in fallow field and woodland, as well as Praty- lenchus in maize field presented in the deeper soil layers (0–80 cm). Significant correlations between the numbers of dominant genera of plant nematodes and soil chemical properties were found in this study. The number of Helicotylenchus under different land uses was posi- tively correlated with C/N ratio, total C, total N, total P, alkai-N, and Olsen-P. The numbers of Filenchus and Paratylenchus in paddy field, Pratylenchus in maize field and Paratylenchus in fallow field were negatively correlated with soil pH, and positively correlated with total C, total N and alkai-N. This study results showed that it is essential to sample at a certain depth according to the vertical distribution informa- tion of different genera of plant nematodes in adequately assessing the population size of plant nematodes.

关键词： Vertical distribution Plant nematodes Dominant genera Aquic brown soil Land use

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Rice Yield and Water Use as Affected by Soil Management Practices

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Pedosphere 2004年第3期14卷 331-337页

作者： WANGXiao-Ying[ XIEHong-Tu LIANGWen-Ju wenda-zhong KeyLaboratoryofTerrestrialEcologicalProcess InstituteofAppliedEcolo9yChineseAcademyofSciencesShenyang110016（China） GraduateSchooloftheChineseAcademyofSciences Beijing100039（China）

A field experiment was conducted at the Shenyang Experimental Station of Ecology, Chinese Academy of Sciences,to study the effects of soil management practices on water use and rice (Oryza sativa L.) yield in an aquic brown soil during 2001 and 2002. A completely random experimental design with three replications was employed, having four soil management practices as treatments, namely: an undisturbed plow layer (CK), a thin plastic film (TN), a thick plastic film (TI) and subsoil compacting (CP). Results indicated no significant differences arong all treatments for rice biomass and grain yields. Also, water consumption was about the same for treatments TN and CK, however the treatments TI and CP were much lower with more than 45% and 40% of the irrigation water in the treatments TI and CP, respectively,saved each year compared to CK. Therefore, water use efficiency was higher in the treatments TI and CP. These results will provide a scientific basis for the water-saving rice cultivation.

关键词：土壤水分损失总量浸透性土壤管理水利用率稻

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Profile Distribution and Storage of Soil Organic Carbon in an Aquic BrownSoil as Affected by Land Use

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Agricultural Sciences in China 2005年第3期4卷 199-206页

作者： JIANGYong ZHANGYu-ge LIANGWen-ju wenda-zhong InstituteofAppliedEcology ChineseAcademyofSciencesShenyang110016PR.China InstituteofAppliedEcology ChineseAcademyofSciencesShenyang110016PR.China／／CollegeofLandandEnvironmentShenyangAgriculturalUniversityShenyang110161P.R.China

Many attempts have been made to estimate the soil organic carbon (SOC) storage under different land uses, especiallyfrom the conversion of forest land or grassland into cultivated field, but limited reports were found on the estimation ofthis storage after cultivated field converted into woodland or grassland, especially in small scales. This study is aimed toinvestigate the dynamics of SOC concentration, its storage and carbon /nitrogen (C/N) ratio in an aquic brown soil at theShenyang Experimental Station of Ecology, Chinese Academy of Sciences under four land use patterns over 14 years. Thefour land use patterns were paddy field (PF), maize field (MF), fallow field (FF) and woodland (WL). In each pedon at 0-150cm depth, soil samples were collected from ten layers. The results showed that the profile distribution of SOC was differentunder different land uses, indicating the effect of land use on SOC. Soil organic carbon was significantly related with soiltotal N, and the correlation was slightly closer in nature ecosystems (with R2=0.990 and P<0.001 in both WL and FF, n=30)than in agroecosystems (with R2=0.976 and P<0.001 in PF, and R2=0.980 and P<0.001 in MF, n=30). The C/N ratio in theprofiles decreased generally with depth under the four land use patterns, and was comparatively higher in WL and lowerin PF. The C/N ratio of the FF was closer to that in the same soil depths of MF than to that of PF. Within 100 cm depth, theannual sequestration of SOC was 4.25, 2.87, and 4.48 t ha-1 more in WL than in PF, MF and FF, the annual SOC increasingrate being 6.15, 3.26, and 5.09 % higher, respectively. As a result, the SOC storage was significantly greater in WL than inany of the other three land use patterns, P=0.001, 0.008, and 0.008 as compared with PF, MF, and FF, respectively, whilethere was no significant difference among the other three land uses. It is suggested that woodland has the potential tomake a significant contribution to C storage and environmental quality.

关键词： Aquic brown soil Carbon storage C/N ratio Land use Soil organic carbon

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dq-序动态相量建模方法及其在电力电子设备建模中的应用

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中国电机工程学报 2023年第24期43卷 9711-9720页

作者：毛晓明罗洪博钟文大蔡润雅广东工业大学自动化学院广东省广州市510006

不平衡工况下,现有的动态相量分析方法难以支撑在dq旋转坐标系下实施控制的一类电力电子设备的高效建模。针对上述不足,提出dq-序动态相量建模方法。首先,通过对三相时域信号进行瞬时对称分量分解并结合基于派克变换基准角的傅里叶分解... 详细信息

不平衡工况下,现有的动态相量分析方法难以支撑在dq旋转坐标系下实施控制的一类电力电子设备的高效建模。针对上述不足,提出dq-序动态相量建模方法。首先,通过对三相时域信号进行瞬时对称分量分解并结合基于派克变换基准角的傅里叶分解,提出dq-序动态相量的定义。其次,推导dq-序动态相量的乘法特性。接着,给出dq-序动态相量状态方程的统一形式、推导步骤和快速形成方法。最后,对不平衡工况下单端电压源型换流器进行建模,验证dq-序动态相量建模方法的正确性和有效性。该文的工作完善了动态相量理论,为不平衡工况下一类电力电子设备的高效建模提供了新方法。

关键词：动态相量 dq-序动态相量交流不平衡建模电力电子

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基于深度森林算法的烧结矿转鼓指数预测模型

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冶金自动化 2022年第4期46卷 78-85页

作者：郝良元刘福龙刘小杰钟文达宋亚超河钢集团有限公司华北理工大学冶金与能源学院河钢股份有限公司承德分公司

传统烧结转鼓强度检测方法存在检测结果滞后问题，这已经严重制约了烧结质量的提高。为了保证高质量烧结矿的顺利生产，提出了一种以烧结机实际工作生产数据为基础，应用深度森林算法建立的转鼓指数实时预测模型。首先，采集储存于异源... 详细信息

传统烧结转鼓强度检测方法存在检测结果滞后问题，这已经严重制约了烧结质量的提高。为了保证高质量烧结矿的顺利生产，提出了一种以烧结机实际工作生产数据为基础，应用深度森林算法建立的转鼓指数实时预测模型。首先，采集储存于异源数据库的2年内的烧结矿生产数据，并进行数据处理工作。然后，利用反向特征筛选方法提取了适用于转鼓指数预测的最优特征参数组合。最后，利用深度森林算法建立了转鼓指数预测模型。预测结果分析表明，与随机森林、支持向量机模型相比，深度森林模型综合预测能力最优，预测值误差接近零且展现出更高的命中率。通过烧结机实际工作生产数据检验和对模型进行训练和优化，能够达到对转鼓指数进行快速精准预测的目的，对烧结现场中烧结矿的高质量生产具有一定指导意义。

关键词：烧结转鼓指数深度森林算法反向特征筛选预测模型烧结矿质量

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基于多神经网络的动态权重集成温度预报订正研究

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热带气象学报 2024年第1期40卷 156-168页

作者：朱育雷杨静钟水新朱文达李智玉魏涛李彦霖顾天红中国气象局广州热带海洋气象研究所/广东省区域数值天气预报重点实验室广东广州510641 贵州省气象台贵州贵阳550002

基于CMA-GD模式预报数据,利用多神经网络的动态权重集成方法,开展了贵州省温度预报订正研究,最终获得本地化温度预报订正产品。结果表明:(1)在对历史数据检验评估的基础上,利用多种神经网络方法可有效降低模式系统误差,通过BP、BP_GA、W... 详细信息

基于CMA-GD模式预报数据,利用多神经网络的动态权重集成方法,开展了贵州省温度预报订正研究,最终获得本地化温度预报订正产品。结果表明:(1)在对历史数据检验评估的基础上,利用多种神经网络方法可有效降低模式系统误差,通过BP、BP_GA、WAVENN、GRNN、LSTM等神经网络订正,2020年贵州省0~72 h预报时效的温度平均绝对误差较模式降低0.01~0.17℃;(2)考虑到不同神经网络订正结果的差异性,采用动态权重方案对订正结果进行优势集成可显著提升预报可靠性。经集成后的温度预报效果优于模式直接输出和各神经网络订正结果,2020年贵州省0~72 h预报时效的温度平均绝对误差较模式降低14.93%,预报准确率提升8.24%。此外,动态权重集成后的订正结果还表现出较好的稳定性。基于该方法形成的本地化客观预报订正产品可为提升贵州复杂地形下温度预报质量以及精细化预报服务水平提供参考依据。

关键词：神经网络集成方法 2 m温度订正 CMA-GD

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视频智能诊断专家系统在承钢计量中的应用

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河北冶金 2015年第1期 66-70页

作者：钟文达刘玮冯强孔媛金杰韦洋河北钢铁集团承钢公司自动化中心河北承德067002

介绍了承钢利用先进的仪表检测控制技术、设备通信控制技术及检测分析模型,通过信息化及网络手段,实现了对不同厂家各类计量设施和视频设备的在线智能检测和诊断分析。按类别进行检测诊断和集中管控,实现物资计量和视频信息的集中采集... 详细信息

介绍了承钢利用先进的仪表检测控制技术、设备通信控制技术及检测分析模型,通过信息化及网络手段,实现了对不同厂家各类计量设施和视频设备的在线智能检测和诊断分析。按类别进行检测诊断和集中管控,实现物资计量和视频信息的集中采集和处理,对运行异常的计量和视频设施,进行界面、颜色、声音、日志形式的诊断报警,指导运维人员及时处理,达到了对在线设备预判、预维护的目标。对同类型的钢铁企业有一定的借鉴意义。

关键词：计量设备智能诊断传感器趋势分析存储服务计算模型

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