文章信息/Info

Title:

Effect of Carbon Fiber Supported Cobalt Nanoparticles on the Hydrogen Storage Properties of Co9S8

文章編號:

1674-3962(2023)02-0128-07

作者:

劉恒; 劉萬強

(長春理工大學材料科學與工程學院，吉林 長春 130012)

Author(s):

LIU Heng;  LIU Wanqiang

(School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130012, China)

關鍵詞:

儲氫; Co/碳納米纖維; 電化學; 復合材料; Co9S8

Keywords:

hydrogen storage;  cobalt/carbon nanofiber;  electrochemistry;  composite material;  Co9S8

分類號:

TG139+.7；TQ035

DOI:

10.7502/j.issn.1674-3962.202208036

文獻標志碼:

A

摘要:

鈷硫合金作為鎳氫電池負極的優良材料在新能源領域受到廣泛關注。然而在充放電過程中由于顆粒聚集和體積變化等問題導致電化學性能不盡人意，限制了其實際應用。開發出一種電化學性能優異、成本低廉、制備工藝簡單的鈷硫復合材料具有十分重要的研究意義和應用價值。以Co9S8為研究對象，采用靜電紡絲工藝制備了負載不同含量Co納米顆粒的碳納米纖維(xCo/CNF)，之后通過高能球磨法將該材料摻雜到Co9S8合金中，得到一系列Co9S8+xCo/CNF復合材料。通過X射線衍射儀、場發射掃描電子顯微鏡對材料的物相和表面微觀形貌進行表征，并對復合材料的放電容量、電化學性能、動力學性能以及耐腐蝕性進行測試。研究結果表明，當添加Co9S8+1.2Co/CNF時，所得復合材料的放電容量最高(566.2 mAh·g-1)，此外，復合電極表現出優異的高倍率放電能力、耐腐蝕性和良好的動力學性能。

Abstract:

Cobalt-sulfur alloy has been widely concerned in the field of new energy as an excellent anode material of nickel metal hydride (Ni-MH) batteries. However, the electrochemical performance is adversely affected by particles aggregation and volume change during the charging and discharging process, which limits its practical application. It is of great significance to develop a cobalt-sulfur composite with excellent electrochemical performance, low cost and simple preparation process. In this paper, Co9S8 was taken as the research object. Carbon nanofibers loaded with cobalt nanoparticles of different contents (xCo/CNF) were prepared by electrospinning and annealing process, and then being doped into Co9S8 alloy by high energy-ball milling method to obtain a series of Co9S8+xCo/CNF composites. The phases and surface morphologies of the composite materials were characterized by X-ray diffractometry (XRD) and field emission scanning electron microscopy (SEM), and the discharge capacity, electrochemical performance, kinetic properties and anti-corrosive performance of the composites were tested. The results showed that when the Co9S8+1.2Co/CNF was added, the discharge capacity of the composite was the highest (566.2 mAh·g-1). In addition, the composite electrode showed excellent high rate discharge ability, corrosion resistance and good kinetic properties.