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Achieving battery-level energy density in carbon/metal sulfide asymmetric supercapacitors using organic radicals 认领 引用 被引量：1
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作者 Xiaolong Li Yunpeng Zhou +4 位作者 Huilin Wei Yongzhihan He Lintong Hu Caicai Li Minjie Shi 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第5期1662-1671,I0198-I0207,共10页
Asymmetric supercapacitors(ASCs)are promising candidates for high-power output applications;however,their theoretical capacity remains largely unrealized owing to the low specific capacity of carbon negative electrode... Asymmetric supercapacitors(ASCs)are promising candidates for high-power output applications;however,their theoretical capacity remains largely unrealized owing to the low specific capacity of carbon negative electrodes.Traditional strategies for enhancing the specific capacity of carbon via structural optimization often compromise the tap density,electrical conductivity,and rate performance of the material.In this study,we address this bottleneck by incorporating 4-hydroxy-2,2,6,6-tetramethylpiperidinyloxyl(4OT)as a redox mediator into the electrolyte to construct ASCs with well-matched capacities and potential windows between the two electrodes.With 50,100,and 200 mM 4OT added in electrolytes,the activated carbon electrodes achieve specific capacities of 113,181,and 263 mAh·g-1at 2 A·g-1.The Ni3S2/CoNi2S4positive electrode exhibited a specific capacity of 415 mAh·g-1,benefiting from its superior electrical conductivity,abundant active sites,and enhanced electrochemical activity.Notably,introducing 4OT to the electrolyte effectively balances the capacity and potential window of the two electrodes.Consequently,the as-assembled ASCs deliver a maximum energy density of55 Wh·kg-1,which surpasses previously reported values.Our work demonstrates that the rational selection and application of redox mediators have great potential for balancing electrode capacity and boosting the energy density of high-performance ASCs. 展开更多
关键词 asymmetric supercapacitors carbon materials redox-active electrolyte organic radicals metal sulfides
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宏基因组来源新过水解酶的分子克隆与酶学特性 认领 引用 被引量：1
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作者 董冰雪 押玉柯 +5 位作者 张伟 张英君 李彩彩 徐安乐 李会庭 毛润乾 《生物工程学报》 CAS CSCD 北大核心 2020年第2期276-286,共11页
旨在获得具有氯化功能的过水解酶,拓展过水解酶资源,为其工业应用奠定基础。以唐河某造纸厂污泥为材料构建宏基因组文库,通过活性筛选获得一个细菌过水解酶Per822。使用大肠杆菌异源表达Per822,研究纯化后的重组蛋白酶学性质并检测了生... 旨在获得具有氯化功能的过水解酶,拓展过水解酶资源,为其工业应用奠定基础。以唐河某造纸厂污泥为材料构建宏基因组文库,通过活性筛选获得一个细菌过水解酶Per822。使用大肠杆菌异源表达Per822,研究纯化后的重组蛋白酶学性质并检测了生成过乙酸的能力。测序结果显示per822编码一个含273个氨基酸的蛋白。Per822是典型的多功能酶代表,分别具有过氧化物酶、卤代酶和酯酶的活性。Per822过水解氯化单氯二甲酮的最适反应pH为4.5,在pH3.5–8.0范围内酶活性稳定。最适反应温度是55℃,在70℃以下酶活性稳定且氯化活性能够被Fe2+激活。以乙酸乙酯为共底物Per822显示出较强的产过乙酸能力。重组Per822的高可溶性表达、催化多功能性、较强的产过乙酸能力使得Per822在有机合成、废水处理、杀菌、生物质预处理等方面有着潜在的应用价值。 展开更多
关键词 过水解酶 过乙酸 催化多功能性 Fe2+激活
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牛樟芝免疫调节蛋白的过量表达及活性分析 认领 引用 被引量：1
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作者 李彩彩 朱聪 +6 位作者 杨国栋 吴剑锋 王晶晶 乔悦 付牧然 崔宣宣 董冰雪 《微生物学报》 CAS CSCD 北大核心 2021年第8期2397-2412,共16页
【目的】用大肠杆菌高效表达牛樟芝免疫调节蛋白(Antrodia camphorata immunomodulatory protein,ACA)。【方法】借助DNAworks3.2.4设计引物合成大肠杆菌密码子偏好性的ACA基因,构建于pET-32a和pGEX-4t-2,转化大肠杆菌,测序后分别命名为... 【目的】用大肠杆菌高效表达牛樟芝免疫调节蛋白(Antrodia camphorata immunomodulatory protein,ACA)。【方法】借助DNAworks3.2.4设计引物合成大肠杆菌密码子偏好性的ACA基因,构建于pET-32a和pGEX-4t-2,转化大肠杆菌,测序后分别命名为pET-32a-ACA/BL21和pGEX-4t-2-ACA/BL21;探索密码子偏好性、载体、培养基种类和诱导条件对ACA表达的影响并使用响应面法优化蛋白表达。纯化重组ACA(recombinant ACA,rACA)并干预小鼠巨噬细胞RAW264.7,通过测定rACA对巨噬细胞增殖能力、吞噬能力、细胞形态及产NO、肿瘤坏死因子α(tumor necrosis factor-α,TNFα)、白介素lβ(interleukin-1β,IL-1β)等细胞因子能力的影响来评估rACA的活性。【结果】pET-32a-ACA/BL21更适合ACA表达;在优化的SOB(酵母粉8.92 g/L)中培养pET-32a-ACA/BL21,添加0.42 mmol/L IPTG 25℃诱导7 h时rACA以可溶性表达为主,产量达187.122μg/mL,是目前大肠杆菌表达真菌免疫调节蛋白的最高报道。纯化的rACA能显著促进小鼠巨噬细胞增殖、提高细胞的吞噬活性和改变细胞形态,显著诱导巨噬细胞分泌NO、TNF-α和IL-1β。【结论】rACA的高效可溶性表达及类似天然ACA的活性使它可以替代天然ACA作为制药行业的食品添加剂或者免疫调节剂,甚至可以用于药物研究。 展开更多
关键词 牛樟芝免疫调节蛋白 密码子偏好性 原核表达 响应面分析 免疫调节
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Acid promoted Ni/NiO monolithic electrode for overall water splitting in alkaline medium 认领 引用 被引量：6
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作者 Caicai Li Junxian HOU +4 位作者 Zexing Wu Kai Guo Dell Wang Tianyou Zhai Huiqiao Li 《Science China Materials》 SCIE EI CAS CSCD 2017年第10期918-928,共11页
Exploring and designing bi-functional catalysts with earth-abundant elements that can work well for both hydrogen evolution reaction（HER） and oxygen evolution reaction（OER） in alkaline medium are of significance f... Exploring and designing bi-functional catalysts with earth-abundant elements that can work well for both hydrogen evolution reaction（HER） and oxygen evolution reaction（OER） in alkaline medium are of significance for producing clean fuel to relieve energy and environment crisis.Here,a novel Ni/NiO monolithic electrode was developed by a facile and cost-effective acid promoted activation of Ni foam.After the treatment,this obtained monolithic electrode with a layer of NiO on its surface demonstrates rough and sheet-like morphology,which not only possesses larger accessible surface area but also provides more reactive active sites. Compared with powder catalysts,this monolithic electrode can achieve intimate contact between the electrocatalyst and the current collector,which will alleviate the problem of pulverization and enable the stable function of the electrode. It can be served as an efficient bi-functional electrocatalyst with an overpotential of 160 mV for HER and 290 mV for OER to produce current densities of 10 mA cm^（-2） in the alkaline medium. And it maintains benign stability after 5,000 cycles,which rivals many recent reported noble-metal free catalysts in 1.0mol L^（-1） KOH solution. Attributed to the easy,scalable methodology and high catalytic efficiency,this work not only offers a promising monolithic catalyst but also inspires us to exploit other inexpensive,highly efficient and self-standing noble metalfree electrocatalysts for scale-up electrochemical water-splitting technology. 展开更多
关键词 electrocatalysis bi-functional acid promoted activation Ni/NiO water splitting monolithic electrode
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Wood-Inspired Electrode for Sustainable Electrocatalytic Energy Conversion 认领 引用 被引量：4
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作者 Weijia Guo Yawen Wang +7 位作者 Shunyu Shen Han Wang Kai Shao Zhenjie Wang Yingru Shi Caicai Li Qingfeng Sun Huiqiao Li 《SmartMat》 EI CSCD 2025年第1期77-101,共25页
Electrocatalysis plays a central role in electrochemical energy storage and conversion systems,providing a number of sustainable processes for future technologies.As a green,renewable,and abundant natural polymer mate... Electrocatalysis plays a central role in electrochemical energy storage and conversion systems,providing a number of sustainable processes for future technologies.As a green,renewable,and abundant natural polymer material,the unique structure and physicochemical properties of wood and its derivatives provide a unique application advantage in the field of electrocatalysis,which has aroused intense attention from researchers.At present,researchers have developed many wood-based catalytic electrodes by taking advantage of the anisotropic hierarchical porous structure of wood and abundant active functional groups on the cell wall surface of wood.Here,a comprehensive review of recent progress in the design and synthesis of woodinspired electrodes for electrocatalytic reactions is summarized.Starting from the role and importance of the electrocatalytic process in the whole energy conversion system,this review highlights the composition and structure of wood,analyzes the mechanisms of electrocatalytic hydrogen evolution reaction(HER),oxygen evolution reaction(OER),urea oxidation reaction(UOR),and oxygen reduction reaction(ORR),and discusses the structure-activity relationship between the structural properties and electrochemical activity of wood-inspired electrodes.Finally,the opportunities,challenges,and future directions in the application of wood and its derivatives in the field of electrocatalysis are prospected. 展开更多
关键词 electrocatalysts electrocatalytic energy conversion hierarchical structure physicochemical properties wood
A biomimetic-structured wood-derived carbon sponge with highly compressible and biocompatible properties for human-motion detection 认领 引用 被引量：1
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作者 Yipeng Chen Lintong Hu +4 位作者 Caicai Li Baokang Dang Qingfeng Sun Tianyou Zhai Huiqiao Li 《InfoMat》 SCIE 2020年第6期1225-1235,共11页
Piezoresistive sensors,as an indispensable part of electronic and intelligent wearable devices,are often hindered by nonrenewable resources(graphene,conventional metal,or silicon).Biomass-derived carbonaceous material... Piezoresistive sensors,as an indispensable part of electronic and intelligent wearable devices,are often hindered by nonrenewable resources(graphene,conventional metal,or silicon).Biomass-derived carbonaceous materials boast many advantages such as their light weight,renewability,and excellent chemical stabilization.However,a major challenge is that the strength and resilience of carbon-based piezoresistive materials still falls short of requirements due to their random microarchitectures which cannot provide sufficiently good stress distribution.Encouraged by the excellent compressible properties and extraordinary strength of the Thalia dealbata stem,we propose a wood biomassderived carbon piezoresistive sensor with an artificial interconnected lamellar structure like the stem itself.By introducing a freezing-induced assembly process,a wood-based,completely delignified,nano-lignocellulose material can be built into a“bridges supported lamellar”type architecture,where subsequent freeze-drying and pyrolysis results in carbon aerogel monoliths.The resultant bioinspired carbon sponge has high compressibility and strength,of the order of two to five times higher than that of conventional metal,carbon,and organic materials.Combined with excellent biocompatible properties and chemical durability,these are useful properties for intelligent wearable devices and human-motion detection. 展开更多
关键词 biocompatible property biomimetic carbon material compressible property lignocellulose piezoresistive sensors
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