CAJ | 학술논문

目的：研究硫酸体系中元素铋、碲和硒的电沉积行为,为电沉积制备n型Bi2 Te3-y Sey 温差电材料提供理论参考。方法采用电化学循环伏安测试技术,对硫酸溶液体系中铋、碲、硒三种元素的电沉积及不同元素间的共沉积过程进行研究。结果纯铋硫酸溶液体系中,Bi3+还原成单质铋的电化学反应是分步进行的,游离态和络合态的铋离子先后发生还原反应。纯碲硫酸溶液体系中,HTeO2+以吸附态和游离态两种形式先后发生还原反应。纯硒硫酸溶液体系中,溶液中的H2 SeO3也通过分步还原反应生成硒单质。在Bi-Te-Se三元硫酸溶液体系中,Bi3+的浓度和基材对电沉积过程有显著影响,Bi-Te-Se化合物对电沉积过程具有促进作用。结论在Bi-Te-Se三元硫酸溶液体系中,Se,Te和Bi元素可依次在阴极表面发生还原反应而实现共沉积,从而制备出n型Bi-Te-Se温差电材料。
목적：연구류산체계중원소필、제화서적전침적행위,위전침적제비n형Bi2 Te3-y Sey 온차전재료제공이론삼고。방법채용전화학순배복안측시기술,대류산용액체계중필、제、서삼충원소적전침적급불동원소간적공침적과정진행연구。결과순필류산용액체계중,Bi3+환원성단질필적전화학반응시분보진행적,유리태화락합태적필리자선후발생환원반응。순제류산용액체계중,HTeO2+이흡부태화유리태량충형식선후발생환원반응。순서류산용액체계중,용액중적H2 SeO3야통과분보환원반응생성서단질。재Bi-Te-Se삼원류산용액체계중,Bi3+적농도화기재대전침적과정유현저영향,Bi-Te-Se화합물대전침적과정구유촉진작용。결론재Bi-Te-Se삼원류산용액체계중,Se,Te화Bi원소가의차재음겁표면발생환원반응이실현공침적,종이제비출n형Bi-Te-Se온차전재료。
ABSTRACT:Objective To study the electrochemical behavior of Bi, Te and Se in sulfuric acid system, providing the theoretical reference for the electrodeposition process of n-type Bi2 Te3-y Sey thermoelectric material. Methods The electrochemical reduction processes of elements Bi, Te and Se in sulfuric acid solution system as well as the codeposition among different elements were in-vestigated by cyclic voltammogram measurements. Results In Bi solution system, the electrochemical reduction process of Bi3+ to elemental Bi could be divided in steps, and the free Bi Bismuth ions and complexed bismuth ions were reduced in sequence. In Te solution system, the adsorbed HTeO2+ and the fress HTeO2+ were reduced in sequence. In Se solution system, the H2 SeO3 in the solution was also reduced to elemental Se through several steps. In the solution system containing elements Bi, Te and Se, the con-centration of Bismuth ions and the difference between substrates had significant influences on the electrodeposition process. The Bi-Te-Se compound as cathode could stimulate the following electrodeposition. Conclusion In Bi-Te-Se ternary sulfuric acid electro-lytes, a co-electrodepositing process of elements Se, Te, Bi could take place on the surface of the cathode through reduction to form Bi-Te-Se compound as n-type thermoelectric material.