欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
设计制作一种新型耐压电化学池并采用循环伏安（CV）和线性扫描伏安（LSV）技术系统研究了碱浓度、氧气压力以及温度对NaOH溶液中氧气还原反应（ORR）的影响．研究结果表明，碱浓度、氧气压力和温度对ORR动力学和热力学都有很大的影响．随着碱浓度增大，ORR过程逐渐由2电子（生成HOi）转为1电子（生成Oi）反应，并且由于氧气溶解度减小和体系粘度增大ORR过程受到很大抑制．增大压力可以明显增加氧气溶解度，从而从动力学上促进ORR过程：同时计算得到了氧气在不同浓度NaOH溶液中的亨利系数．随着介质温度升高，由于氧气反应活性增强、扩散系数增大和溶解度减小的共同作用，表现出在给定浓度下存在一最佳温度使得ORR峰电流达到最大．
英文摘要：
In this study, the influences of alkali concentration, oxygen partial pressure, and temperature on the oxygen reduction reaction （ORR） were examined in detail, using a specially designed electrochemical cell, by cyclic voltammetry （CV） and linear sweep voltammetry （LSV） in NaOH solutions. It was found that the ORR pathway is dependent on the solution alkalinity, and is transformed from a two-electron reduction by forming HO; in dilute solutions to a one-electron reduction by forming stable O; in concentrated solutions. The process was significantly suppressed by decreases in the oxygen solubility and increases in the media viscosity. The oxygen pressure had a significant influence on the ORR, substantially promoting the ORR in alkaline solutions as a result of the greatly increased solubility of oxygen in the solutions. We obtained the Henry＇s constants of oxygen in NaOH solutions with different concentrations. The temperature had a clear dual effect on the ORR, as shown by the existence of an optimal temperature for the ORR in a given alkaline solution. These observations are discussed in terms of the oxygen reaction activity, oxygen solubility, and diffusion coefficient.
同期刊论文项目
同项目期刊论文
A Novel Method to Extract Vanadium and Chromium from Vanadium Slag using Molten NaOH-NaNO3 Binary Sy
A novel method of leaching vanadium from extracted vanadium residue using sodium sub-molten salt med
Indirect Electrochemical Cr(III) Oxidation in KOH Solutions at an Au Electrode: The Role of Oxygen R
Polyethylenimine-functionalized poly(vinyl alcohol) magnetic microspheres as a novel adsorbent for r
Adsorptive recovery of vanadium(V) from chromium(VI)-containing effluent by Zr(IV)-loaded orange jui
High capacity adsorption of Cr(VI) from aqueous solution using polyethylenimine-functionalized poly(
Zhang Yi. Research and prospect on extraction of vanadium from vanadium slag by liquid oxidation tec
Effective Chromium Extraction from Chromium-containing Vanadium Slag by Sodium Roasting and Water Le
Synthesis of polyethylenimine-functionalized poly(glycidyl methacrylate) magnetic microspheres and t
Crystallization and Separation of Potassium Vanadate in Highly Concentrated Potassium Hydroxide Solu
期刊信息
位置：