2.1 Materials and chemicals
Ti3AlC2 powder (200 mesh) was purchased
from Laizhou Kaien Ceramic Materials Co., Ltd. HCl
(36~38%) was purchased from Guangzhou Chemical Reagent
Co., Ltd. LiF (99.9%) was provided by Aladdin Reagent Co., Ltd.
Anhydrous ethanol (99.9%) was purchased from Guangzhou Donghong Reagent
Co., Ltd. Multi-walled carbon nanotubes (CNTs) were purchased from
Jiangsu Xianfeng Nanomaterials Technology Co., Ltd. On-site deionized
water was obtained from ELGA Lab Water Purification Systems. A stainless
steel cleaning agent was provided by Shenzhen Xinchangyuan Chemical Co.,
Ltd. Nanjing Gaoqian Functional Materials Technology Co., Ltd. provided
the tubular porous stainless steel substrates (Φ8 mm × δ2 mm × l 500 mm)
with an average pore size of 2 μm, which can be cut to the desired
length.