RuxNb1-xO2 catalyst for the oxygen evolution reaction in proton exchange membrane water electrolysers
RuxNb1-xO2 catalyst for the oxygen evolution reaction in proton exchange membrane water electrolysers
复制标题
用于质子交换膜水电解槽析氧反应的 RuxNb1-xO2 催化剂
DOI：
10.1016/j.ijhydene.2013.04.100
复制
发表时间：
2013
影响因子：
7.2
通讯作者：
Puthiyapura V
中科院分区：
文献类型：
--
作者：
Puthiyapura V
采用Adams法和水解法制备了氧化钌（RuO2）和氧化铌（Nb2O5）双金属催化剂体系。采用x射线衍射（XRD）、扫描电镜（SEM）、循环伏安（CV）和极化测量对催化剂的物理和电化学表征进行了研究。在RuO2中加入nb2o5可以提高RuO2的稳定性。在Adams法中发现硝酸钠与nb2o5在高温下形成络合物。这使得Adams法不适用于ruo2 - nb2o5双金属体系的合成。而水解法则不存在这个问题。但水解法不能得到两种氧化物的适当混合物。与水解法相比，Adams法获得了更小的双金属体系晶粒尺寸。Adams法制备的氧化钌在离子膜电解条件下的活性高于水解法制备的氧化钌。当RuO2(A)为1 A/cm2时，电池电压为1.62 V。在连续循环伏安和电解槽试验中，发现Ru0.8Nb0.2O2(A)的稳定性高于RuO2(A)。
Bimetallic catalyst system of ruthenium oxide (RuO2) and niobium oxide (Nb2O5) was prepared using the Adams method and the hydrolysis method. Physical and electrochemical characterizations of the catalysts were studied using X-ray diffraction (XRD), Scanning electron microscopy (SEM), cyclic voltammogram (CV) and polarization measurements. Nb2O5addition to RuO2was found to increase the stability of RuO2. In Adams method the sodium nitrate was found to be forming complex with Nb2O5at high temperature reaction. This makes Adams method unsuitable for the synthesis of RuO2–Nb2O5bimetallic system. Hydrolysis method on other hand does not have this problem. But a proper mixture of two oxides was not obtained in hydrolysis method. A lower crystallite size for bimetallic system was obtained with Adams method compared to hydrolysis method. RuO2prepared by Adams method had higher activity compared to the hydrolysis counterpart in electrolyzer operation with nafion membrane. A cell voltage of 1.62 V was obtained with RuO2(A) at 1 A/cm2. A higher stability for Ru0.8Nb0.2O2(A) compared to RuO2(A) was observed in continuous cyclic voltammogram and electrolyzer cell test.