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Defect-engineered two-dimensional transition metal dichalcogenides towards electrocatalytic hydrogen evolution reaction

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Carbon Energy 2023年第6期5卷 21-44页

作者： Hang Su Xiaodong Pan suqin li Hao Zhang Ruqiang Zou School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijingChina Beijing Key Laboratory of Theory and Technology of Advanced Battery Material School of Materials Science and EngineeringPeking UniversityBeijingChina

Recently,two-dimensional transition metal dichalcogenides(TMDs)demonstrated their great potential as cost-effective catalysts in hydrogen evolution ***,we systematically summarize the existing defect engineering strategies,including intrinsic defects(atomic vacancy and active edges)and extrinsic defects(metal doping,nonmetal doping,and hybrid doping),which have been utilized to obtain advanced TMD-based *** on theoretical simulations and experimental results,the electronic structure,intermediate adsorption/desorption energies and possible catalytic mechanisms are thoroughly *** emphasis is given to the intrinsic relationship between various types of defects and electrocatalytic ***,current opportunities and challenges for mechanical investigations and applications of defective TMD-based catalysts are *** aim herein is to reveal the respective properties of various defective TMD catalysts and provide valuable insights for fabricating high-efficiency TMD-based electrocatalysts.

关键词： defect engineering electrocatalysts hydrogen evolution reaction(HER) transition metal dichalcogenides

Copper Removal from Molten Steel by Gasification

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Journal of Iron and Steel Research International 1999年第2期6卷 10-13页

作者： li liansheng li Shiqi Xiang Changxiang Cao Jie liu Keming li suqin University of Science and Technology Beijing

A novel method is proposed to enhance the gasification and removal of copper from molten steel by adding ammonium salts or urea into molten steel under normal *** decopperization experiments were conducted in a molybdenum-wire resistance furnace at 1 873 *** copper content of about 400 g of a mild steel was reduced from 0.49%(mass fraction,the same below) and 0.51% to 0.31% and 0.38% using 0.7 g of NHC1 and 0.5 g of(NH)COrespectively,while the copper content of the molten steel was reduced from 0.61%to 0.56% using 2.00 g of NHCONH.

关键词： molten steel copper removal ammonium salt

MOF-based quasi-solid-state electrolyte for long-life Al-Se battery

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Journal of Energy Chemistry 2023年第11期86卷 237-245,I0006页

作者： Haiping Lei Jiguo Tu suqin li Jiacheng Wang Zheng Huang Zhijing Yu Shuqiang Jiao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Aluminum-selenium(Al-Se)batteries,which possess a high theoretical specific capacity of 1357 mA h g^(-1),represent a promising energy storage ***,they suffer from significant attenuation of capacity and low cycle life due to the shuttle *** mitigate the shuttle effect induced by soluble selenium chloroaluminate compound that tends to migrate towards the negative electrode,a quasi-solid-state Al-Se battery was fabricated through the synthesis of a multi-aperture structure quasisolid-state electrolyte(MOF@GPE)based on metal-organic framework(MOF)material and gel-polymer electrolyte(GPE).The high ionic conductivity(1.13×10^(-3)S cm^(-1))of MOF@GPE at room temperature,coupled with its wide electrochemical stability window(2.45 V),can facilitate ion transport kinetics and enhance the electrochemical performance of Al-Se *** MOF@GPE-based quasi-solidstate Al-Se batteries exhibit outstanding long-life cycling stability,delivering a high specific discharge capacity of 548 mA h g^(-1)with a maintained discharge specific capacity of 345 mA h g^(-1)after 500 cycles at a current density of 200 mA g^(-1).The stable ion transmission and high ion transport kinetics in MOF@GPE can be attributed to the stable structure and permeable channel of MOF,which effectively captures the soluble selenium chloroaluminate compound and further restrains the shuttle effect,resulting in improved cycling performance.

关键词： Aluminum selenium batteries MOF Quasi-solid-state electrolyte Shuttle effect Transport kinetics

竹叶青酒中12种药材总黄酮、总酚含量及色度稳定性研究

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酿酒 2024年第1期51卷 12-15页

作者：周丹李小霞高晓娟石潇璇李素琴山西杏花村汾酒厂股份有限公司山西汾阳032205

研究利用紫外分光光度计测定了竹叶青酒中12种药材的总黄酮、总酚等化学成分的含量,并分析了12种药材在一定光照和温度条件下的色度变化情况,结果显示丁香提取液的多酚含量最高,菊花提取液的黄酮含量最高,多酚含量仅次于丁香。12种药材... 详细信息

研究利用紫外分光光度计测定了竹叶青酒中12种药材的总黄酮、总酚等化学成分的含量,并分析了12种药材在一定光照和温度条件下的色度变化情况,结果显示丁香提取液的多酚含量最高,菊花提取液的黄酮含量最高,多酚含量仅次于丁香。12种药材中,只有菊花提取液在极限环境下的色度值会上升。

关键词：菊花总黄酮总酚色度

Orientation controlled preparation of nanoporous carbon nitride fibers and related composite for gas sensing under ambient conditions

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Nano Research 2017年第5期10卷 1710-1719页

作者： suqin li Zhiwei Wang Xiaoshan Wang Fangfang Sun Kai Gao Ningxian Hao Zhipeng Zhang Zhongyuan Ma Hai li Xiao Huang Wei Huang Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Jiangsu National Synergistic Innovation Centerfor Advanced Materials (SICAM) Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China

Creating pores in suprastructures of two-dimensional （2D） materials while controlling the orientation of the 2D building blocks is important in achieving large specific surface areas and tuning the anisotropic properties of the obtained functional hierarchical structures. In this contribution, we report that arranging graphitic carbon nitride （g-C3N4） nanosheets into one-dimensional （1D） architectures with controlled orientation has been achieved by using 1D oriented melem hydrate fibers as the synthetic precursor via a polycondensation process, during which the removal of water molecules and release of ammonia gas led to the creation of pores without destroying the 1D morphology of the oriented structures. The resulting porous g-C3N4 fibers with both meso- and micro-sized pores and largely exposed edges exhibited good sensing sensitivity and selectivity towards NO2. The sensing performance was further improved by hybridization of the porous fibers with Au nanoparticles （Au NPs）, leading to a detection limit of 60 ppb under ambient conditions. Our results suggest that the highly porous g-C3N4 fibers and the related hybrid structures with largely exposed graphitic layer edges are excellent sensing platforms and may also show promise in other electronic and electrochemical applications.

关键词： graphitic carbon nitride Au nanoparticle gas sensing porous fiber chemiresistive sensor

Cobalt-based deep eutectic solvent modified nitrogen-doped carbon catalyst for boosting oxygen reduction reaction in zinc-air batteries

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Chinese Journal of Structural Chemistry 2024年第1期43卷 33-39页

作者： Peng Wang Daijie Deng suqin Wu li Xu Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang212013China

As an oxygen reduction reaction(ORR)catalyst,nitrogen-doped carbon(NC)is widely used in zinc-air batteries(ZABs).However,NC catalysts exhibit low conductivity and insufficient exposure of active ***,a Co-based deep eutectic solvent(DES)was selected to modify NC catalyst(Co-NC)to improve ORR *** functional theory(DFT)calculation shows that the modification of Co-based DES can change the electronic structure of NC and increase metallic active sites,which is beneficial to the desorption of reaction intermediates on Co-NC,further improving ORR ***-NC shows excellent ORR performances and ***,ZABs assembled with Co-NC manifest a high maximum power density of 177.4 mW cm^(-2),a high specific capacity of 726.12 mA h g^(-1)and a charge-discharge cycle life of 500 *** study can provide practical reference for surface modified carbon-based electrocatalyst with DES to improve ORR performances.

关键词： Deep eutectic solvent Nitrogen-doped carbon Surface modification Oxygen reduction reaction Zinc-air battery

近红外光谱技术快速检测清香型白酒大曲指标的研究

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酿酒 2024年第3期51卷 74-78页

作者：凌晨耿超马清蓉许迎子李素琴高晓娟彭福东山西杏花村汾酒厂股份有限公司山西汾阳032205

为实现清香型白酒大曲理化指标的快速检测,结合清香型白酒大曲制作工艺和相关大曲检测标准的要求,运用近红外光谱技术,建立了清香型白酒大曲水分、糖化力和液化力的快速检测模型。结果表明:通过筛选不同光谱预处理方法和波数范围,运用... 详细信息

为实现清香型白酒大曲理化指标的快速检测,结合清香型白酒大曲制作工艺和相关大曲检测标准的要求,运用近红外光谱技术,建立了清香型白酒大曲水分、糖化力和液化力的快速检测模型。结果表明:通过筛选不同光谱预处理方法和波数范围,运用偏最小二乘法(PLS)建立模型,使用内部交叉验证得到最优模型,各理化指标模型的相关系数(R2)值大于0.75线性良好,交叉验证均方根(RMSECV)预测误差较小。使用盲样对大曲各指标的模型进行外部验证,水分、糖化力和液化力的相对标准偏差分别为3.61%、5.07%和5.84%,符合生产检测的需求,可运用于清香型白酒大曲的日常检测分析。

关键词：清香型白酒大曲近红外光谱技术水分糖化力液化力模型预测

近红外光谱技术在清香型酒醅检测中的应用研究

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酿酒 2024年第2期51卷 100-106页

作者：凌晨马清蓉耿超许迎子赵汉鹰赵璇李素琴高晓娟山西杏花村汾酒厂股份有限公司山西汾阳032205

为实现清香型酒醅理化指标的快速检测,结合清香型白酒酿造工艺同时运用近红外光谱技术,建立了入缸酒醅水分、淀粉和发酵酒醅水分、酸度、酒度、淀粉指标的快速检测模型。结果表明:通过使用不同光谱预处理方法和波数范围建立模型,使用内... 详细信息

为实现清香型酒醅理化指标的快速检测,结合清香型白酒酿造工艺同时运用近红外光谱技术,建立了入缸酒醅水分、淀粉和发酵酒醅水分、酸度、酒度、淀粉指标的快速检测模型。结果表明:通过使用不同光谱预处理方法和波数范围建立模型,使用内部交叉验证得到最优模型,各理化指标模型的相关系数(R^(2))值大于0.7线性良好,交叉验证均方根(RMSECV)小于1.15预测误差较小。使用盲样对各指标的模型进行外部验证,结果的相对标准偏差均在10%以内,符合生产检测的需求,可运用于酒醅的日常检测分析。

关键词：清香型酒醅近红外光谱技术理化指标模型预测

The Study of Two Geomagnetic Jerks in China

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Earthquake Research in China 2009年第2期23卷 192-199页

作者： Zhang suqin Yang Dongmei li Qi Zhao Yongfen Institute of Geophysics China Earthquake Administration Beijing 100081 China

This paper analyzes the first differences of the annual means (annual rate) for the Y and Z components of the geomagnetic field from nine magnetic observatories in China, measured from 1985 to 2003. The 1991 jerk was obvious in the Y component measured but not clear for the Z component. Rapid changes in the Z components were ubiquitous around 2000-2001, but not seen for the Y component. External effects were removed from the monthly means by comparing the monthly mean of the geomagnetic field components at the observatories with the monthly time series of the A_p geomagnetic index. However, some examples were analyzed and showed whether external effects were removed or not, there was no marked distinction in determining the jerks in China for the Y component and the Z component of the geomagnetic field. Finally, the isolines of the first differences of the annual means were used to analyze the spatial and temporal distributions of the jerks.

关键词： Jerk Annual rate External field Isolines Ap index