钛基镍-钴氧化物电极在盐水电解中活性衰减原因的探讨

本文研究钛基镍-钴氧化物(Ti/Ni-Co-O)电极在电解盐水过程中的耐蚀性和进行析氧反应的稳定性,分析探讨了该电极性能衰减的原因.在300gdm~(-3)NaCl水溶液中,于电流密度200mA·cm~(-2)下电解数小时后,溶液经原子吸收分光光度法检测,证明存在镍、钴离子,其溶解速度大于文献中钌-钛阳极中钌的溶解速度,镍钴含量之比大于涂液中两成分之比.该电极在1MKOH 溶液进行析氧反应时具有长期的稳定性,在0.5M K_2SO_4溶液中也比钌-钛电极寿命长.实验结果说明镍-钴氧化物在酸性溶液中的化学不稳定性是其析氯或析氧活性衰减的根本原因,针对钌-钛阳极设计的析氧反应标准快速寿命检测不适于评价钛基镍-钴氧化物电极

非贵金属氧化物析氯电极的研究

本文采用热分解法制备了几种不同组分的尖晶石型钴氧化物涂层电极。用扫描电镜和光学显微镜对电极表面形貌及断面组织进行了观察。在300g/l NaCl水溶液中测定了各电极析氯反应的恒电流电位—电流特性。结果表明:在单金属尖晶石Co_3O_4中掺杂二价异种金属离子M~(++)(M代表Ni、Cu、Zn)后电极析氯活性提高,双金属尖晶石M_xCo_(3-x)O_4(

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies