NaOH溶液中碱浓度、氧气压力以及温度对Pt电极上氧气还原反应的影响

引用本文: 彭中, 阎文艺, 王少娜, 郑诗礼, 杜浩, 张懿. NaOH溶液中碱浓度、氧气压力以及温度对Pt电极上氧气还原反应的影响[J]. 物理化学学报, 2014, 30(1): 67-74. doi: 10.3866/PKU.WHXB201311143 shu

Citation: PENG Zhong, YAN Wen-Yi, WANG Shao-Na, ZHENG Shi-Li, DU Hao, ZHANG Yi. Effect of Alkali Concentration, Oxygen Partial Pressure and Temperature on Oxygen Reduction Reaction on Pt Electrode in NaOH Solution[J]. Acta Physico-Chimica Sinica, 2014, 30(1): 67-74. doi: 10.3866/PKU.WHXB201311143 shu

NaOH溶液中碱浓度、氧气压力以及温度对Pt电极上氧气还原反应的影响

彭中 ^1,2,3, ,
阎文艺 ^2, ,
王少娜 ^2, ,
郑诗礼 ^2, ,
杜浩 ^2, ,
张懿 ^2,

基金项目:
国家重点基础研究发展规划项目(973) (2013CB632601) (973) (2013CB632601)

国家自然科学基金(51274178，51274179，51090382)资助 (51274178，51274179，51090382)

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HO₂^-)转为1 电子(生成O₂^-)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.

关键词:

English

Effect of Alkali Concentration, Oxygen Partial Pressure and Temperature on Oxygen Reduction Reaction on Pt Electrode in NaOH Solution

1.
1 School of Chemical Engineering, Tianjin University, Tianjin 300072, P. R. China;
2 National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China;
3 National Engineering Research Center of Distillation Technology, Tianjin 300072, P. R. China
Received Date: 24 September 2013
Available Online: 01 January 2014
Fund Project:
国家重点基础研究发展规划项目(973) (2013CB632601)

国家自然科学基金(51274178，51274179，51090382)资助

Abstract:

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 HO₂^- in dilute solutions to a one-electron reduction by forming stable O₂^- 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.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

NaOH溶液中碱浓度、氧气压力以及温度对Pt电极上氧气还原反应的影响

English

Effect of Alkali Concentration, Oxygen Partial Pressure and Temperature on Oxygen Reduction Reaction on Pt Electrode in NaOH Solution

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

NaOH溶液中碱浓度、氧气压力以及温度对Pt电极上氧气还原反应的影响

English

Effect of Alkali Concentration, Oxygen Partial Pressure and Temperature on Oxygen Reduction Reaction on Pt Electrode in NaOH Solution

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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