金属钝化曲线的测定实验的改进研究

采用线性电位扫描法测定镍在硫酸溶液中钝化行为。与以往的实验不同之处是使用CHI系列电化学工作站如CH1660A代替JH2X型数字式恒电位仪，实验表明：不但实验的速度有明显提高；而且可大大减少数据处理引入的误差。     

热解温度对秸秆生物炭钝化重金属污染土壤影响分析

为了探究热解温度对以黄豆秸秆制备生物炭对土壤重金属Pb及Cd的吸附及钝化性能,以黄豆秸秆为原材料,在300,500和700℃热解温度下制备生物炭,并探究其对土壤重金属铅锌的钝化作用。实验结果表明随热解温度升高,生物炭中碳含量呈现上升趋势,且pH由8.95升高至10.23,灰分的含量却由34.5%下降至28.6%。热解温度能对生物炭吸附重金属Pb及Cd产生影响,并且热解温度升高,重金属吸附量呈现上升趋势,并且当热解温度为700℃时,生物炭对Pb及Cd的吸附量分别为1.2和26.8 mg/g。进一步探究表明热解温度能够提高生物炭对Pb及Cd的钝化性能,机制研究表明生物炭能够提高土壤中pH,并且热解温度升高提高了残渣态Pb及Cd的含量而降低酸可提取态Pb及Cd的含量。     

双面钝化高效硅空间太阳电池的设计及研究

从研制空间用高效太阳电池出发,比较了双面钝化硅太阳电池相对于砷化镓太阳电池的优势,提出了一种新型双面钝化高效硅太阳电池的设计思想和研制方法．给出电池样品的测试结果,该电池在ＡＭ０,２５℃下光电转换效率为１８．７％．     

苯并三氮唑与5-羧基苯并三氮唑在NaCl溶液中对铜缓蚀作用的SERS研究

采用表面增强拉曼光谱技术（SERS）研究了w＝0．03NaCl溶液中BTA（苯并三氨唑）及其衍生物5CBTA（5－羟基苯并三氮唑）对铜的缓蚀作用机理,发现5CBTA对铜的作用与BTA的作用机理相似,在较大正电位下两者都是通过三氮唑环与铜形成配合物覆盖在铜表面,随着电位负移在铜电极表面吸附的聚合物膜逐渐转化分为分子形式吸附,5CBTA中的－COOH基团只是起到空间位阻的作用,没有参与电极表面的吸附。两者配使用以BTA吸附为主,其缓蚀机理没有发生改变,也没有产生协同效应。     

Effect of temperature on the passivation behavior of steel rebar

Steel rebar normally forms an oxide or rusty skin before it is embedded into concrete and the passivation properties of this skin will be heavily influenced by temperature. To study the effect of temperature on the passivation properties of steel rebar under different surface conditions, we conducted scanning electron microscopy (SEM) observations and electrochemical measurements, such as measurements of the free corrosion potential and polarization curves of HPB235 steel rebar. These measurements identified three kinds of surfaces: polished, oxide skin, and rusty skin. Our results show that the passivation properties of all the surface types decrease with the increase of temperature. Temperature has the greatest effect on the rusty-skin rebar and least effect on the polished steel rebar, because of cracks and crevices on the mill scale on the steel rebar’s surface. The rusty-skin rebar exhibits the highest corrosion rate because crevice corrosion can accelerate the corrosion of the steel rebar, particularly at high temperature. The results also indicate that the threshold temperatures of passivation for the oxide-skin rebar and the rusty-skin rebar are 37℃ and 20℃, respectively.     

功率半导体器件终端SIPOS/PI复合钝化结构研究

本文采用直流辉光放电法在台面功率半导体器件上生长SIPOS钝化膜.研究结果表明,SIPOS钝化的功率器件性能要好于聚酰亚胺钝化的功率器件,可以有效地提高功率器件的可靠性.基于此提出了SIPOS/PI复合钝化结构来改善台面功率半导体器件的表面特性.     

细胞色素C修饰电极的制备和性能研究

通过自组装法,把血红蛋白细胞色素C固定于导电聚合物(聚谷氨酸)层,制作成一种微型生物传感器,检测其对过氧化氢和亚硝酸钠的响应.实验发现谷氨酸具有一定的电化学活性,循环伏安图在-0.35 V和-0.05 V出现一对氧化还原峰,而且细胞色素C修饰电极对亚硝酸钠响应所得循环伏安图表明,随着亚硝酸钠加入量增大,还原峰增大.通过吸附法修饰电极,把血红蛋白细胞色素C固定于电极表面,探究修饰电极在对苯二胺中的钝化情况.实验表明:细胞色素C修饰电极可以避免电极钝化的发生.细胞色素C作为一种蛋白酶,使对苯二胺处于氧化状态,从而防止电极表面膜的形成,避免电极钝化的发生.     

H+ passivation of poly-si solar cells processed by different annealing processes

The effects of different annealing processes on the photovoltaic (PV) properties and the spectral response as well as minority carrier lifetime in the bulk of unanalyzed PF₅ ion implantation poly-Si solar cells were investigated. The different hydrogen passivation effects of defects in poly-Si induced by three heat treatment processes are reported. We used RTA-rapid thermal annealing, YAG pulse laser annealing and CTSA-classical three-step annealing for this study. The results show that cells processed by RTA (800°C, 4 sec) achieved the best PV properties and spectral response among all annealed samples. Under this precess condition, no or few defects were induced in bulk. While RTA (>-850°C for 4 sec), CTSA as well as YAG laser processes induced defects of different nature and concentration in the bulk of cells. It is further shown that hydrogen ion implantation significantly improved, the performances of poly-Si cells. It is able to efficiently remove the YAG laser induced defects in bulk. However, it cannot completely passivate the defects induced by CTSA and RTA processes. Biography: LI Jin-chai (1946-), male, Associate professor. Research direction: studies of ion beam modification of materials and films of new functionail materials.     

Synthesis and structure of Cu5(BTA)6(TTA)4 · 5DMF, a copper-nitrogen cluster containing η Π3-benzotriazolate

The title cluster compound—Cu₅(BTA)₆(TTA)₄·5DMF was prepared using thenyltrifluoroacetone and benzotriazolate ligands. The crystal structure indicates that a tetrahedral array of Cu(1), Cu(2), Cu(3) and Cu(4) ions surrounding a central Cu(5) ion are held together by bridging tridentate BTA^- and terminated by TTA^- bond cap. The three nitrogen atoms of a BTA^- bond three different copper ions to form a η³-benzotriazolate. The central Cu ion has a distorted octahedral structure and the surrounding Cu ions are 5 coordinated forming distorted tetragonal structures. The distances between the surrounding Cu(Ⅱ) ions and the central Cu(Ⅱ) ion are in the range of 0.3561—0.3755 nm and those between the surrounding Cu(Ⅱ) ions are in the range of 0.5785—0.6301 nm.     

氨基三甲叉膦酸对铝合金钛锆钝化膜性能的影响

将氨基三甲叉膦酸添加到钛锆钝化液中,用浸渍法在AA6061铝合金表面上形成钝化膜.用电化学方法研究了添加氨基三甲叉膦酸前后的钛锆钝化膜的耐腐蚀性能,并对成膜机理和耐蚀机理进行了分析.电化学分析结果表明,添加氨基三甲叉膦酸后,腐蚀电位更低,且腐蚀电流密度明显降低,说明在钛锆钝化液中加入氨基三甲叉膦酸后可以更好地减缓铝合金的阴极反应,从而更有效地抑制铝合金腐蚀反应的发生.