浸渍煅烧法在CoNC表面可控包覆MoS2提高电催化性能研究
Immersion calcination for controllable coating of MoS2 on surface of CoNC to improve electrocatalytic performance
高效电催化剂是提高锂空气电池(LOBs)存储容量和电化学稳定性的关键。为了制备高活性电催化剂,将钴氮掺杂碳骨架(CoNC)浸渍在(NH4)2MoS4溶液中,通过离心和煅烧在CoNC表面包覆二硫化钼纳米片。该复合材料具有介孔结构和丰富的活性位点(Co、Co9S8、Co—N、Mo—N键),超薄二硫化钼纳米片的包覆可以提高CoNC骨架的稳定性,Mo组分在煅烧过程中诱导CoNC的非晶碳向石墨碳转变,以提高复合材料的导电性。结果表明,该复合材料是O2还原和析出反应(ORR/OER)良好的电催化剂,用其作正极催化剂时,锂空气电池表现出很高的比容量(18 162 mA·h/g)和循环稳定性(304次)。
The activity of electro-catalyst on oxygen cathode is a key factor affecting the property of lithium-O2 batteries (LOBs).In this work,cobalt-nitrogen co-doped carbon skeleton (CoNC) is immersed in (NH4)2MoS4 solution,and then MoS2 nanosheets are grown on the surface of CoNC through centrifugation and calcination.The composite prepared has a mesoporous structure and abundant active sites such as Co,Co9S8,Co-N bond,and Mo-N bond.The coating of ultra-thin MoS2 nanosheets can improve the stability of CoNC skeleton.Mo component induces the amorphous carbon of CoNC to transform to graphitic carbon during calcination in order to improve the conductivity.This study shows that MoS2/Co9S8@CoNC is a good electro-catalyst for O2 reduction and evolution reactions (ORR/OER).The LOBs with MoS2/Co9S8@CoNC oxygen cathode show high specific discharge capacity (18 162 mA·h·g-1) and good cycle stability (304 cycles).
MoS2 / 电催化剂 / 锂氧气电池 / CoNC / Co9S8
MoS2 / electro-catalyst / lithium-O2 battery / CoNC / Co9S8
| [1] |
|
| [2] |
|
| [3] |
|
| [4] |
|
| [5] |
|
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
|
| [17] |
|
| [18] |
|
| [19] |
|
| [20] |
|
| [21] |
|
| [22] |
|
| [23] |
|
| [24] |
|
| [25] |
|
| [26] |
|
| [27] |
|
| [28] |
|
| [29] |
|
国家自然科学基金(52272196)
/
| 〈 |
|
〉 |
PDF
(7961KB)
