【摘要】：如今世界經(jīng)濟(jì)發(fā)展迅速,但與此同時能源逐漸短缺的問題以及大量使用化石燃料所導(dǎo)致的環(huán)境問題越來越尖銳,所以盡快尋找化石能源的替代品成為了新時代發(fā)展的一大議題。電分解水制氫的發(fā)展已經(jīng)有了很久的歷史,但仍面臨著電分解水制氫電能消耗過多,造成電分解水制取氫氣不能大量投入工業(yè)生產(chǎn)的問題,尋找合適的電極催化劑材料成為了解決這個問題的出路。MOF材料因?yàn)槠浣Y(jié)構(gòu)的特殊性使之現(xiàn)在已經(jīng)成為研究的熱點(diǎn),它在電催化分解水方面有很大的潛力。本課題首先制備了Co-MOF前驅(qū)體ZIF-67,然后將其分別在700℃、800℃和900℃三種溫度下燒結(jié)。用XRD、TEM、氮?dú)馕?脫附等測試手段分別表征了材料的晶相和孔隙結(jié)構(gòu),對材料的電催化分解水制取氫氣(HER)的催化性能做了一系列測試。進(jìn)一步探究了刻蝕、燒結(jié)溫度對催化過程的影響。測試結(jié)果顯示,刻蝕之后的材料的比表面積更大,催化性能更好;相比于其他燒結(jié)溫度,800℃燒結(jié)的材料氮摻雜量最多為2.88%,石墨化程度更高Raman ID/IG為0.943,且比表面積更大為464.401 cm2/g。對其進(jìn)行電化學(xué)催化產(chǎn)氫性能測試,結(jié)果表明800℃燒結(jié)的樣品的催化性能更好,他在過電勢為-306mV時電流密度達(dá)到10 mA/cm2,塔菲爾斜率值為98 mV/dec,經(jīng)電化學(xué)阻抗擬合計(jì)算該材料的電荷遷移電阻為29.6Ω,然后通過材料在不同掃速下的循環(huán)伏安曲線,計(jì)算得出該材料的雙電層電容為2.605 mF/cm2。制備Fe摻雜ZIF-67,并對其在800℃下進(jìn)行燒結(jié)。通過XRD和TEM表征表明Fe元素成功摻雜進(jìn)入了MOF結(jié)構(gòu)中,5%摻雜量的材料的氮摻雜量最高為7.03%,石墨化程度最高,Raman ID/IG為0.935,比表面積為466.9 cm2/g,對各個摻雜含量樣品進(jìn)行電化學(xué)催化產(chǎn)氫性能測試,實(shí)驗(yàn)結(jié)果表明Fe摻雜量為5%的樣品的催化性能最好,它在過電勢為-209 mV時電流密度達(dá)到10 mA/cm2,塔菲爾斜率值為80 mV/dec,經(jīng)電化學(xué)阻抗擬合計(jì)算該材料的電荷遷移電阻為23.6Ω,然后通過測試材料在不同掃速下的循環(huán)伏安曲線,計(jì)算得出該材料的雙電層電容為5.06mF/cm2,說明燒結(jié)溫度為800℃Fe摻雜含量為5%時的材料的電催化性能最好。
[Abstract]:Nowadays, the world economy is developing rapidly, but at the same time, the problem of energy shortage and the environmental problems caused by the extensive use of fossil fuels are becoming more and more acute. Therefore, finding a substitute for fossil energy as soon as possible has become a major issue for the development of the new era. The development of electrolysis water hydrogen production has a long history, but it is still faced with the problem of excessive consumption of electricity energy for hydrogen production by electricity decomposition water, resulting in the fact that hydrogen produced by electric decomposition water cannot be put into industrial production in large quantities. Finding suitable electrode catalyst material has become the way to solve this problem. Because of its special structure, MOF material has become a research hotspot, and it has great potential in the field of electrocatalytic decomposition of water. In this paper, Co-MOF precursor ZIF-67, was prepared and sintered at 700 鈩，

本文編號：2377083