Electrochemical Preparation of Nanostructural Pt–Ni and Pd–Ni Films for Ethanol Electro-Oxidation

通过电沉积法在Ti基体上制备具有纳米结构的Pt-Ni和Pd-Ni薄膜，前者呈纳米花瓣形状，厚度为10 ~ 20 nm，后者主要由纳米颗粒组成，大小为50 ~ 60 nm. XRD测试结果显示Pt-Ni和Pd-Ni纳米薄膜结晶程度较差. 循环伏安法测试薄膜对乙醇电催化氧化的性能，结果表明Pt-Ni和Pd-Ni纳米薄膜可使乙醇起始氧化电位分别负移至–0.74 V 和-0.71V，且在碱性介质中加Ni可提高催化剂的活性和抗毒化性能.The Pt-Ni and Pd-Ni films were successfully prepared on Ti substrates by electrodeposition method. The porous Pt-Ni nanoflakes appeared to be uniform with the thickness of the slices about 10 ~ 20 nm. The porous Pd-Ni nanoparticles with a flower shape appeared to be uniform with the diameters of 50 ~ 60 nm. The XRD patterns also indicated that the Pd-Ni and Pt-Ni nanostructures have the poor crystallinity. The onset potentials of ethanol oxidation were negatively shifted to –0.74 V on Pt-Ni electrodes and –0.71 V on Pd-Ni electrodes, respectively. Addition of Ni could enhance catalytic activities and antitoxic properties of Pt, as well as the electro-catalytic activities of Pd for ethanol oxidation in alkaline media.This work was supported by NSFC (No. 51101138, 20873184, and 90923008), S & T Project of Shanxi Department of Education (No. 20111024), Innovation and Entrepreneurship for College Students Project in Shanxi Province (No. 2011343) and Young Teacher Starting-up Research of Yuncheng University (No. YQ-2010013).This work was supported by NSFC (No. 51101138, 20873184, and 90923008), S & T Project of Shanxi Department of Education (No. 20111024), Innovation and Entrepreneurship for College Students Project in Shanxi Province (No. 2011343) and Young Teacher Starting-up Research of Yuncheng University (No. YQ-2010013).作者联系地址：1. 运城学院应用化学系，山西 运城 044000；2. 运城学院图书馆，山西 运城044000Author's Address: 1. Department of Applied Chemistry, Yuncheng University, Yuncheng 044000, Shanxi, China 2. Library of Yuncheng University, Yuncheng 044000, Shanxi, China通讯作者E-mail：[email protected]

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