【摘 要】
：
In conventional ethylene carbonate (EC)/propylene car-bonate (PC) electrolyte,sodium metal reacts spontaneously and del-eteriously with solvent molecules.This significantly limits the prac-tical feasibility of high-voltage sodium metal batteries based on
【机 构】
：
Key Laboratory of Material Physics of Ministry of Education,School of Physics and Microelectronics,Z
论文部分内容阅读
In conventional ethylene carbonate (EC)/propylene car-bonate (PC) electrolyte,sodium metal reacts spontaneously and del-eteriously with solvent molecules.This significantly limits the prac-tical feasibility of high-voltage sodium metal batteries based on Na metal chemistry.Herein,we present a sodium metal alloy strategy via introducing NaIn and Na2In phases in a Na/In/C composite,aiming at boosting Na ion deposition stability in the common EC/PC electro-lyte.Symmetric cells with Na/In/C electrodes achieve an impressive long-term cycling capability at 1 mA cm-2 (＞ 870 h) and 5 mA cm-2(＞ 560 h),respectively,with a capacity of 1 mAh cm-2.In situ optical microscopy clearly unravels a stable Na ion dynamic deposition process on the Na/In/C composite electrode surface,attributing to a dendrite-free and smooth morphology.Furthermore,theoretical simulations reveal intrinsic mechanism for the reversible Na ion deposition behavior with the composite Na/In/C electrode.Upon pairing with a high-voltage NaVPOF cathode,Na/In/C anode illustrates a better suitability in SMBs.This work promises an alternative alloying strategy for enhancing Na metal interfacial stability in the common EC/PC electrolyte for their future applications.
其他文献
以湿法磷酸生产的经浮选后的废弃磷尾矿为原料,从其中分离回收钙镁,制备新型土壤调节剂糖醇钙镁,对磷尾矿进行了煅烧活化和酸浸动力学的实验研究.基于热重分析及钙镁酸解浸出率分析的研究结果表明,磷尾矿中白云石热分解过程为吸热反应,白云石热分解遵循二维相界面反应模型;钙、镁浸出反应表观活化能分别为13.157、23.023 kJ/mol;煅烧活化后的尾矿酸浸出速率受内扩散控制,获得白云石热分解及钙、镁浸出反应的动力学方程.
硝酸-氯化钾直接法可低成本制备熔盐级硝酸钾,溶剂萃取分离氯盐溶液中的硝酸和盐酸是关键步骤之一.研究了处理H+/K+/Cl-/H2O-磷酸三丁酯/磺化煤油体系脉冲筛板萃取塔的水力学性能,结果表明分散相液滴直径随脉冲强度的增大而减小,与两相表观流速无关;存留分数随脉冲强度的增大呈现先减小后增大的趋势,随两相表观流速的增大而增大.拟合得到了液滴直径与存留分数的Kumar-Hartland关联式,两者计算值和实验值的平均相对偏差(AARD)分别为4.74％与5.60％.
以ZIF-8为前驱体,采用热解法制备碳掺杂氧化锌.分别研究ZIF-8在350、400、450℃下煅烧以及陈化10 min、3 h、24 h对制备原位碳掺杂氧化锌的影响.通过热重(TG)、X射线衍射(XRD)和扫描电镜(SEM)研究样品的形貌和结构;紫外可见漫反射光谱(UV-vis)和光致发光光谱(PL)证明原位碳掺杂氧化锌具有可见光吸收能力和更低的光生载流子复合率;DFT模拟计算表明氧化锌晶格中掺入碳元素能有效减小带隙值.原位碳掺杂氧化锌较纯氧化锌在可见光和紫外光照射下的光催化性能分别提高1.5倍和3.0
轻烧氧化镁气流床煅烧炉热工行为研究是其热工参数优化、实现节能降耗的必需的基础性工作之一.基于Euler-Lagrange理论建立了某企业轻烧氧化镁气流床煅烧炉数值计算模型,籍此研究了炉内气固流动、传热及分解过程基本规律,并确定了现有产量下的适宜煅烧风量.结果表明:主炉内煅烧烟气旋流上升,温度中心高、壁面低;副炉内旋流效应骤减,温度趋于均匀;距离烟气入口4～18 m行程范围内,气固换热剧烈,物料快速分解,分解率达96％,而后于24 m处分解完全.将煅烧风量降至原有风量的91.22％、气料体积质量比降至1.4
Additive manufacturing-also known as 3D printing-has attracted much attention in recent years as a powerful method for the simple and versatile fabrication of complicated three-dimensional structures.However,the current technology still exhibits a limitat
针对水泥行业使用固废、危废导致其二氧化硫排放浓度超标的问题,通过脱硫试验筛选具有催化作用的三氧化二铁、氧化镁制备成新型高效催化脱硫剂,其脱硫效率高于工业级氢氧化钙.在河南DD水泥有限公司进行了新型高效催化脱硫剂的工业应用试验.结果表明:与工业级氢氧化钙相比,新型高效催化脱硫剂具有更高的脱硫效率,钙硫物质的量比降低了56.7％.通过新型高效催化脱硫剂的使用,可满足水泥企业二氧化硫质量浓度<35 mg/Nm3的超低排放要求,且此过程无废弃物产生.制备的新型高效催化脱硫剂具有广阔的应用前景.
The electroreduction reaction of CO2 (ECO2RR) requires high-performance catalysts to convert CO2 into useful chemicals.Tran-sition metal-based atomically dispersed catalysts are promising for the high selectivity and activity in ECO2RR.This work presents
开发了一种新型的纳米微晶silicate-1(S-2)的合成方法.与常规的silicate-1(S-1)相比,S-2具有较小的粒径和光滑的晶体表面.当S-2作为晶种合成纳米ZSM-5聚集体时,ZSM-5团聚体为尺寸为0.8～1.0μm的单分散颗粒,构成团聚体的ZSM-5晶体为b轴厚度为60～80 nm的纳米薄片.ZSM-5纳米薄片沿着同一方向规则地堆叠形成独特的孔结构,该孔结构包括1.3 nm的均一孔道和25 nm的宽尺寸孔道.
Flexible pressure sensors with high sensitivity are desired in the fields of electronic skins,human-machine interfaces,and health monitoring.Employing ionic soft materials with microstructured archi-tectures in the functional layer is an effective way tha