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aCollege of Materials Science and Engineering, Taiyuan University of

Technology, Taiyuan 030024, ChinabSecond Hospital of Shanxi Medical University, Taiyuan 030001, ChinacGeneral Hospital of Yangquan Coal Industry Group Co., Ltd, Yangquan

045000, ChinadShanxi Academy of medical Sciences, Shanxi Da Yi Hospital, Taiyuan

030032, China

Diethylenetriaminepentaacetic acid-functionalized multi-wall

carbon nanotubes (MWCNT-DTPA) were labeled by 99mTc and

intravenously administered to rabbits, the radioactivity in differ-

ent organs was scanned by single photon emission computed

tomography and a well-type c counter. Results showed that the

administered MWCNT-DTPA-99mTc was mainly distributed in

heart, liver, spleen and kidney. Centrifugate from urine was sub-

jected to transmission electron microscopy analysis which

showed that MWCNTs could be excreted through the urinary

system.

[New Carbon Materials 2012, 27(6): 421426]

Synergetic effect of conductive additives on the performance of

high power lithium ion batteries

Qi Wanga,b, Fang-yuan Suc, Zhi-yuan Tanga, Guo-wei Linga,

Quan-hong Yanga,c

aSchool of Chemical Engineering and Technology, Tianjin University,

Tianjin 300072, ChinabEighteen Research Institute of China Electronics Technology Group

Corporation, Tianjin 300381, ChinacEngineering Laboratory for Functionalized Carbon Materials, Graduate

School at Shenzhen, Tsinghua University, Shenzhen 518055, China

Two commercial conductive additives, carbon black (super P,

SP) and vapor grown carbon fibers (VGCFs), were used to con-

struct an effective conducting network in the cathode of commer-

cial LiFePO4 lithium ion batteries (LIBs). Results suggest that the

LIB with SP possesses a higher discharge capacity than that with

VGCFs with the same mass fraction of the additives. The high-

rate capacity of LIB with SP is much higher than that with VGCFs.

Furthermore, the LIB with a mixture of these two additives has an

apparently improved performance in low and high rate discharge

capacity compared with the LIBs with a single component addi-

tive with the same mass fraction due to the synergetic effect.

The same conclusion can be reached for the larger-capacity bat-

teries (10 Ah or 50 Ah packs). Therefore, the use of two different

fillers is important for the high power LIBs used in the electric

vehicle and mass energy-storage industry.


Preparation of a direct methanol fuel cell tubular cathode support

from mesocarbon microbeads and graphite

Hong-jun Nia, Dong Tangb, Ming-qiang Yina,b, Xing-xing Wanga,

Ping Liaoa, Ming-yu Huanga, Yu Zhua

aSchool of Mechanical Engineering, Nantong University, Nantong,

Jiangsu 226019, China

b School of Automobile and Traffic Engineering, Jiangsu University,

Zhenjiang, Jiangsu 212013, China

A tubular cathode support green body for tubular direct meth-

anol fuel cell was prepared by a gel casting molding method using

a mixture of mesocarbon microbeads and natural graphite pow-

der with a mass ratio of 3:2 as carbon precursor. It was sintered

at 1000 C for 5 h in a graphite boat covered by graphite powder.

Subsequently, a tubular cathode and a planar anode were

obtained by coating the supports with slurry containing a catalyst

and a Nafion membrane in a PTFE suspension. The catalysts for

the cathode and anode are Pt/C and PtRu/C, respectively. Results

show that the surface of the tubular cathode support is smooth

with no distortion. Both the gas diffusion layer and catalyst layer

of the cathode show a similar porous structure with most of the

holes in the sub-micron scale, which is favorable for decreasing

mass transfer resistance and improving catalytic efficiency. A sin-

gle cell performance test indicates that the sintered cathode

bodies from the mixture of mesocarbon microbeads and graphite

can be used as a special-shaped cathode support.


Preparation and characterization of activated carbons from spirit

lees by physical activation

Qiang Lia,b, Yin Wanga, Jian Yua, Bin Yic, Jun Yangc, Guang-wen

Xua

a National Key Laboratory of Multiphase Complex System, Institute of

Process Engineering, Chinese Academy of Sciences, Beijing 100190,

Chinab CNOOC New Energy Investment Co., Ltd., Beijing 100016, Chinac Luzhou Laojiao Group, Luzhou, Sichuan 646000, China

Spirit lees was carbonized and then activated by steam and

CO2 to prepare activated carbons. The effect of carbonization

temperature, type and amount of activator, activation tempera-

ture and time on the pore structure, and the adsorption of meth-

ylene blue and iodine were investigated. The gas products during

activation were analyzed online to reveal the activation mecha-

nism. Results showed that steam activation was rather more

active than CO2. Regardless of the activation agent, a low carbon-

ization temperature of 450 C and a medium activation tempera-

ture of 800 C favored the iodine adsorption. For the methylene

blue adsorption, the same low carbonization temperature of450 C, however, medium/high activation temperatures (850

900 C) are favorable. The best activated carbon was prepared

with a steam activator using a carbonization temperature of

450 C and an activation temperature of 800 C, which had a sur-

face area and pore volume of 371.6 m2/g and 0.34 cm3/g, and

iodine and methylene blue adsorption capacities of 580 mg/g

and 90 mg/g respectively. O- and H-containing functional groups

in the carbonized spirit lees reacted with the activation regent

(steam or CO2) to form the initial pores, then the accessible active

sites reacted with the activation regent to generate secondary

pores.


376 CARBON 55 (2013) 375378

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