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Improving the water electrolysis performance by manipulating the generated nano/micro-bubbles using surfactants

Nano Research 2023年第1期16卷 420-426页

作者： Houpeng Wang Zhaoxiang Xu Wei Lin Xue Yang Xianrui Gu Wei Zhu Zhongbin Zhuang SINOPEC Research Institute of Petroleum Processing Beijing 100083China State Key Lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical TechnologyBeijing 100029China

The impeded mass transfer rate by on-site-generated gas bubbles at both cathode and anode dramatically reduces the energy conversion efficiency of the proton exchange membrane water electrolyzer(PEMWE).Herein,we report a surfactant-assistant method to accelerate the nano/micro-bubble detachment and the mass transfer rate by reducing the surface tension,resulting in an increase in overall *** kinds of surfactants are studied in this *** potassium perfluorobutyl sulfonate(PPFBS),which has the structural similarity to Nafion,shows a significant promotion of activity and stability for both hygrogen evolution reaction(HER)and oxygen evolution reaction(OER)in the acidic medium at the high current density *** HER overpotential at 0.1 A·cm−2 decreased 22%,and the current density at−0.4 V increased 31%by adding *** promotion of overall efficiency by PPFBS on a homemade PEMWE was also *** reduced surface tension and electrostatic repulsion were the probable origins of the accelerated bubble detachment.

关键词： proton exchange membrane water electrolysis bubble overpotential surfactant electrostatic repulsion

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Surface-derived phosphate layer on NiFe-layered double hydroxide realizes stable seawater oxidation at the current density of 1 A·cm^(−2)

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Nano Research 2024年第7期17卷 5786-5794页

作者： Chaoxin Yang Zhengwei Cai Jie Liang Kai Dong Zixiao Li Hang Sun Shengjun Sun Dongdong Zheng Hui Zhang Yongsong Luo Yongchao Yao Yan Wang Yuchun Ren Qian Liu Luming Li Wei Chu Xuping Sun Bo Tang College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinan 250014China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Department of Science and Environmental Studies Faculty of Liberal Arts and Social Sciencethe Education University of Hong KongHong Kong 999077China Institute for Advanced Study Chengdu UniversityChengdu 610106China Laoshan Laboratory Qingdao 266237China

Seawater electrolysis,especially in coastlines,is widely considered as a sustainable way of making clean and high-purity H2 from renewable energy;however,the practical viability is challenged severely by the limited anode durability resulting from side reactions of chlorine ***,we report an effective Cl^(−) blocking barrier of NiFe-layer double hydroxide(NiFe-LDH)to harmful chlorine chemistry during alkaline seawater oxidation(ASO),a pre-formed surface-derived NiFe-phosphate(Pi)***,the PO_(4)^(3−)-enriched outer-layer is capable of physically and electrostatically inhibiting Cl−adsorption,which protects active Ni^(3+)sites during *** NiFe-LDH with the NiFe-Pi outer-layer(NiFe-LDH@NiFe-Pi)exhibits higher current densities(j)and lower overpotentials to afford 1 A·cm^(−2)(η1000 of 370 mV versusη1000 of 420 mV)than the NiFe-LDH in 1 M KOH+***,the NiFe-LDH@NiFe-Pi also demonstrates longer-term electrochemical durability than NiFe-LDH,attaining 100-h duration at the j of 1 A·cm^(−2).Additionally,the importance of surface-derived PO_(4)^(3−)-enriched outer-layer in protecting the active centers,γ-NiOOH,is explained by ex situ characterizations and in situ electrochemical spectroscopic studies.

关键词： seawater oxidation phosphate outer-layer layered double hydroxide electrostatic repulsion in situ Raman

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Demulsification performance and mechanism of oil droplets by electrocoagulation: Role of surfactant

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Journal of Environmental Sciences 2022年第8期34卷 171-180页

作者： Liang Wang Ben Zhang Bin Zhao Saiguo Yang Kun Wu Jingqiu Sun Chengzhi Hu State Key Laboratory of Separation Membranes and Membrane Processes School of Environmental Science and EngineeringTiangong UniversityTianjin 300387China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China

Surfactants are widely used to improve the solubility of oil in water in petrochemical,making it more difficult to remove oil–water emulsions during the water treatment ***(EC) is an appropriate method for treating oily wastewater and destabilizing emulsions. However, the demulsification mechanism of oil–water droplets emulsified by surfactants with different charges have not been investigated systematically. The demulsification performance of electrocoagulation on emulsions wastewater containing cationic,non-ionic, and anionic surfactants was studied. The results showed that the removal rate of total organic carbon(TOC) in oily wastewater with anionic surfactant by EC reached92.98% ± 0.40% at a current density of 1 mA/cm^(2), while that of the non-ionic surfactant was 84.88% ± 0.63%. The characterization of flocs showed that EC has the highest coagulation and demulsification of oil droplets with a negative charge on the surface(-70.50 ± 10.25mV), which indicated that the charge neutralization of oil droplets was beneficial for the destabilization of the formed oily flocs. However, when the zeta potential of the oil droplets reached 75.50 ± 1.25 mV, the TOC removal efficiency was only 11.80% ± 1.43%. The TOC removal could achieve 33.23% ± 3.21% when the current density improved from 1 mA/cm^(2)to 10 mA/cm^(2). The enhanced removal was due to the sweep coagulation rather than charge neutralization. This study provides a fundamental basis for the electrochemical treatment of oily wastewater.

关键词： Charge neutralization electrostatic repulsion Flotation Surfactant

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Bifunctional fluoropyridinium-based cationic electrolyte additive for dendrite-free Li metal anode

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Nano Research 2023年第7期16卷 9530-9537页

作者： Kunyao Peng Pei Tang Qianqian Yao Qingyun Dou Xingbin Yan Department of Materials Science and Engineering Sun Yat-Sen UniversityGuangzhou 510275China

Although lithium metal has become a promising anode material for high-energy batteries owing to its high specific capacity and the lowest reduction potential,the continuous side reactions with electrolyte as well as the safety problem caused by Li dendrite growth restrict Li anode’s practical ***,we demonstrate that N-fluoropyridinium(ArF^(+))bis(trifluoromethane)sulfonimide(TFSI-)as an electrolyte additive can protect the lithium metal by both solid electrolyte interphase(SEI)protection and electrostatic repulsion *** ArF+cations not only participate in forming F,Ncontaining SEI protective layer on Li surface,but also act as a cationic repellent during Li deposition to inhibit Li dendrite *** a result,the cycle performance of Li symmetric cells and Li||LiFePO_(4)full cells were significantly improved by using ArFTFSIadded *** study provides an electrolyte additive strategy for Li anode realizing SEI protection and electrostatic repulsion simultaneously.

关键词： lithium metal anode electrolyte additive solid electrolyte interphase(SEI) electrostatic repulsion lithium metal battery(LMB)

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Estimation of Separation of Electrolytes and Organic Compounds by Nanofiltration Membranes Using an Irreversible Thermodynamic Modei

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Chinese Journal of Chemical Engineering 2003年第5期11卷 583-588页

作者： Pallab Ghosh Reverse Osmosis Division Central Salt and Marine Chemicals Research Institute Bhavnagar 364002 Gujarat India

Nanofiltration separation has become a popular technique for removing largeorganic molecules and inorganic substances from water. It is achieved by a combination of threemechanisms: electrostatic repulsion, sieving and diffusion. In the present work, a model based onirreversible thermodynamics is extended and used to estimate rejection of inorganic salts andorganic substances. Binary systems are modeled, where the feed contains an ion that is much lesspermeable to the membrane as compared with the other ion. The two model parameters are estimated byfitting the model to the experimental data. Variation of these parameters with the composition ofthe feed is described by an empirical correlation. This work attempts to describe transport throughthe nanofiltration membranes by a simple model.

关键词： diffusion donnan equilibrium electrostatic repulsion ion adsorption irreversible thermodynamics nanofiltration polymeric membranes steric hindrance surface charge

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Designing Stable Antiparallel Coiled Coil Dimers

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Tsinghua Science and Technology 2001年第3期6卷 253-256页

作者：曾宪纲周海梦 Department of Chemical Engineering Wuyi University Jiangmen Guangdong 529020 China Department of Biological Sciences and Biotechnology Tsinghua University Beijing 100084 China

The history of antiparallel coiled coil dimer design is briefly reviewed and the main principles governing the successful designs are explained. They include analysis of the inter subunit electrostatic repulsion for determining partners for dimerization and of the buried polar interaction for determining the relative orientation of the partners. A theory is proposed to explain the lack of antiparallel coiled coil homodimers in nature. 

关键词： coiled coil dimer antiparallel orientation hydrogen bond electrostatic repulsion

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