Highly stable N-containing polymer-based Fe/Nx/C electrocatalyst for alkaline anion exchange membrane fuel cell applications

A cost-effective electrocatalyst with high activity and stability was developed. The Fe-Nx and pyridinic-N active sites were embedded in nitrogen-doped mesoporous carbon nanomaterial by carbonization at high temperature. The electrocatalyst exhibited excellent electrochemical performance for the oxygen reduction reaction, with high onset potential and half-wave potential values (E_onset = 1.10 ?V and E_1/2 ?= ?0.944 ?V) than 20 ?wt % Pt/C catalyst (1.04 and 0.910 ?V). The mass activity of the Schiff base network (SNW) based SNW-Fe/N/C@800° electrocatalyst (0.64 ?mA ?mg^?1 @ 1 ?V) reached about half of the commercial Pt/C electrocatalyst (1.35 ?mA ?mg^?1 @ 1 ?V). The electrocatalyst followed the 4-electron transfer mechanism due to very low hydrogen peroxide yield (H₂O₂ ?< ?1.5%) was obtained. In addition, this electrocatalyst with dual active sites showed high stability during cyclic voltammetry and chronoamperometry measurements. More importantly, the electrocatalyst also demonstrated the power density of 266 ?mW ?cm^?2 in the alkaline anions exchange membrane fuel cell (AEMFC) test, indicating its prospective application for fuel cells.     

Gas-Liquid Interfacial Plasma engineering under dilute nitric acid to improve hydrophilicity and OER performance of nickel foam

The world has been moving rapidly to find new eco-friendly energy sources. Water electrolysis consists of two reactions of Oxygen Evolution Reaction (OER) and Hydrogen Evolution Reaction (HER), whereas the OER is considered the rate-limiting step. The most commercialized electrode for OER in the alkaline electrolyte is Ni foam, but its original surface is hydrophobic. It is possible to accelerate the adsorption and desorption process of reactants and products during OER by adding hydrophilic functional groups such as –OH on the surface of Ni foam. In this study, a novel Gas-Liquid Interfacial Plasma (GLIP) engineering at room temperature was successfully applied to modify the Ni foam surface dilute (1 ?M) HNO₃ solution. At a current density of 400 ?mA ?cm^?2, GLIP-treated Ni foam electrodes at 1 ?M HNO₃ concentrations showed OER overpotentials of 458 ?mV. Among all, GLIP with 1 ?M HNO₃ treatment of 30 ?min showed 129 ?mV less overpotential than the nickel foam before treatment. In summary, GLIP can be justified as an environmentally friendly and efficient surface treatment to improve the wettability and OER performance of Ni-based electrodes in water electrolysis.     

CoTMPyP在氧电还原中的催化性能

用较简化的步骤合成CoTMPyP,并以紫外可见光谱对产物进行表征.循环伏安法和旋转环盘电极法用于研究该配合物的电化学行为及对氧还原的催化性能.发现Co(Ⅱ/Ⅱ)TMPyP~(5+/4+)电对具有较可逆的氧化还原性质,在0.05MH_2SO_4溶液介质中氧化还原电位约为0.28V(vs.SCE),比报道的FeTMPyP和CoTHOEPyP等的为正.CoTMPyP的存在使氧还原的峰电位正移了约0.4V,催化作用遵循EC再生机理.氧的还原沿着分别生成H_2O和H_2O_2的平行途径进行.随着电位的负移,产物中水的比例提高,这可由氧同CoTMPyP的配位作用加以解释.     

人硫氧还蛋白对脑缺血作用的CT灌注与SOD相关性的实验研究

目的研究人硫氧还蛋白(hTRX)对局灶性兔脑缺血/再灌注损伤后脑组织的保护作用,并探讨其清除氧自由基的生物学活性.方法采用线栓法制成一侧兔脑缺血/再灌注模型(栓塞6 h,再灌注18 h),将25只雄性新西兰白兔随机分成假手术组(Sham组,5只)、缺血/再灌注组(I/R组,10只)和缺血/再灌注 hTRX治疗组(I/R hTRX组,10只),I/R hTRX组给予hTRX(0.75 mg/kg体质量),Sham组、I/R组以等容积的生理盐水取代hTRX;分别于梗死后6 h及再灌注后18 h做CT灌注图像,观察脑梗死面积,计算出其所占同侧大脑半球面积的百分比(HLA%);检测脑组织匀浆中SOD,MDA含量.结果脑缺血/再灌注后,脑梗死范围显著,脑组织匀浆中SOD明显下降,MDA明显升高(与假手术组比较,P<0.01);而应用hTRX能显著减小脑梗死面积,降低MDA及升高SOD含量(与B组比较,P<0.01).结论重组hTRX对脑缺血/再灌注损伤有显著的治疗作用.     

棉织物碱前处理工艺废水污染性评价及工艺优化

针对棉织物两步法前处理工艺优化问题,通过对织物处理效果以及废水污染性的分析,得出影响织物前处理效果以及废水污染性的主要因素,结合两者,得出最佳工艺参数。研究结果表明:在最佳工艺条件下(处理温度90℃×50min,氢氧化钠20g/L,精炼剂FK-ST10b 0.5g/L,100%双氧水3.0g/L,硅酸钠1.0g/L),废水污染性显著降低,COD值降低23.6%,且织物白度和毛效能够达到织物前处理要求。     

CaTi0.9Li0.1O3—δ晶格中氧空位与选择性活性氧物种的TG …

用常规ＴＧＡ（程序升温热重分析）法间接表征了催化剂ＣａＴｉ０．９Ｌｉ０．１Ｏ３－δ晶格中的氧空位，关联了氧空位、可活动氧量与催化剂的乙烷氧化脱氢（ＯＤＨＥ）反应的催化性能，提出了乙烷在该类催化剂上氧化脱氢的选择性氧物种为８７３～１０２３Ｋ的温度范围内脱附的所谓可活动氧（Ｏ＾－，Ｏ＾２－，Ｏ＾２－２简写为Ｏ＾δ－１）。利用Ｏ２－ＴＰＤ－ＭＳ鉴定了ＴＧＡ结果，证明了该法简便、实用、可靠。     

应用PWC170推算Vo2max评估学生身体机能

对广西师范大学体育系和普通系男女学生进行ＰＷＣ１７０测定，运用两种回归方程推算Ｖｏ２ｍａｘ，并对学生身体机能进行对比评价，结果表明，体育系学生ＰＷＣ１７０和Ｖｏ２ｍａｘ的平均值大于普通系学生，Ｐ〈０．０１，采用广西师范大学纪锦和研制的应用ＰＷＣ１７０推算Ｖｏ２ｍａｘ的回归方程更为简便实用，有其独特的优越性。     

Multiple metallic dopants in nickel nanoparticles for electrocatalytic oxygen evolution

Developing efficient oxygen evolution reaction(OER) electrocatalysts is of great importance for sustainable energy conversion and storage. Ni-based catalysts have shown great potential as OER electrocatalysts, but their performance still needs to be improved. Herein, we report the multiple metal doped nickel nanoparticles synthesized via a simple oil phase strategy as efficient OER catalysts. The FeMnMoV–Ni exhibits superior OER performance with an overpotential of 220 mV at 10 mA cm^-2     

First-principles investigation of structural and electronic properties of oxygen adsorbing phosphorene

Two-dimensional (2D) phosphorene has been extensively studied for potential electronic and optoelectronic applications.It is easily oxidized by adsorbing oxygen in the air,exhibiting changed materials stability and properties.Yet the impact of oxygen concentrations on stability and electronic properties of oxygen adsorbing phosphorene has never been systematically investigated.In this article,the oxygen adsorbing phosphorene at different oxygen concentrations are studied via first-principles crystal structure searches.We considered stoichiometries of P_8O,P_(16)O_(3)) P_4O and P_8O_(3,)with both single-side and dual-side adsorption for selected case P_4O.The energetically stable structure of each stoichiometry is identified.It has been found that the band gaps show rather wide range change,strongly depending on the oxygen concentration.Interestingly,at the higher oxygen concentration the relatively low band gaps and small carrier effective masses emerge,comparable with the pristine black phosphorus.This may be associated with the appearance of bridged P-O-P bonds as oxygen concentration increasing.The electronic properties are discussed in relation to structural features and chemical bonding.     

80例重症颅脑损伤恢复期高压氧治疗分析

目的：探讨高压氧对重症颅脑损伤病人治疗效果．方法：对赤峰市医院收治的80例重症颅脑损伤病人在临床用药基础上应用高压氧治疗．结果：病人不同程度症状改善．结论：重症颅脑损伤高压氧治疗疗效显著．