CAJ | 학술논문

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。
설계제작일충신형내압전화학지병채용순배복안(CV)화선성소묘복안(LSV)기술계통연구료감농도、양기압력이급온도대NaOH용액중양기환원반응(ORR)적영향。연구결과표명，감농도、양기압력화온도대ORR동역학화열역학도유흔대적영향。수착감농도증대， ORR과정축점유2전자(생성HO2-)전위1전자(생성O2-)반응，병차유우양기용해도감소화체계점도증대ORR과정수도흔대억제。증대압력가이명현증가양기용해도，종이종동역학상촉진ORR과정；동시계산득도료양기재불동농도NaOH용액중적형리계수。수착개질온도승고，유우양기반응활성증강、확산계수증대화용해도감소적공동작용，표현출재급정농도하존재일최가온도사득ORR봉전류체도최대。
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 special y 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, substantial y 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.