细胞分裂的类型 细胞分裂 (cell division) 可分为 无丝分裂 (amitosis) 、 有丝分裂 (mitosis) 和 减数分裂 (meiosis) 三种类型。
以熱裂解法製備不同形貌 Pt- Ir 奈米粒子及其燃料電池觸媒應用之研究
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Transcript of 以熱裂解法製備不同形貌 Pt- Ir 奈米粒子及其燃料電池觸媒應用之研究
以熱裂解法製備不同形貌 Pt-Ir 奈米粒子及其燃料電池觸媒應用之研究 指導老師 : 王聖璋 博士
研究生 : 林仕章
2014/05/21
Nano Functional Ceramic Lab.
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Contents• Introduction
• Experimental procedure
• Results and discuss
• Conclusions
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• Most of the world’s energy consumption is greatly dependent on fossil fuels, which are exhaustible. Fossil fuels are being used extensively due to continuous escalation in the world’s population and development (Khan and Iqbal, 2005). We are in the exhaustion phase of oil (Bockris and Veziroglu, 2007). According to the US Department of Energy, the peak in the delivery rate of world oil will be reached in less than 15 years (2021), while others argue that the maximum global rate of oil production has already been reached (The Oil Drum, 2008). In any case, great pressure will be placed on remaining oil supplies and hence oil prices by the increasing demands from the rapidly developing economies of China and India.
Introduction
School of Aerospace, Mechanical and Manufacturing Engineering RMIT University June 2008
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Experimental procedure
實驗架設
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Results and discuss
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graphene XC-72
觸媒奈米粒子之載量分析 _TGA
Pt-Ir+IrO2 + CO2Pt-Ir + CXC-72
485oC , Ir → IrO2
Pt-IrO2800oC
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369oC
0 100 200 300 400 500 600 700 800 9000
20
40
60
80
100
0 100 200 300 400 500 600 700 800 9000
20
40
60
80
100 XC-72
369oC 511oC
Pt-Ir/XC-72
Wei
ght %
(%)
Temperature(oC)
20 30 40 50 60 70 80
Pt-Ir/XC-72_800oC_O2
IrO2-JCPDS-15-870
Ir-JCPDS-46-1044
Pt-JCPDS-04-0802Inte
nsity
(a.u
.)
2(degree)
0 100 200 300 400 500 600 700 800 9007880828486889092949698
100
485oC275oC
wei
ght%
(%)
Temperature(oC)
Pt-Ir powder
275oC 即可去除 OA 、 ODE 、OLA 去除碳載體得知 Pt-Ir 實際載量
and
graphene
電化學循環伏安法 _ 反應電解槽的架設與製備
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Pt-Ir/graphene + IPA + Nafion solution
Carbon cloth
1cm2
Coating
Drying
參考電極 Hg/Hg2Cl2
輔助電極 鉑片電解溶液 0.5M 硫酸水溶液工作面積 1cm2
掃描速率 20mV/sec
掃瞄電位範圍 -0.3V~1.2V
0 1 2 3 4 5 6 7 8 9 100
10
20
30
40
50
60Pt-Ir/graphene
Dis
tribu
tion(
%)
Particles size (nm)
0 1 2 3 4 5 6 7 8 9 100
10
20
30
40
50
60Pt-Ir/XC-72
Dis
tribu
tion(
%)
Particles size (nm)
-0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2
-10
-8
-6
-4
-2
0
2
4
6
8C
urre
nt d
ensi
ty (m
A/c
m2 ) Pt-Ir/XC-72
Potential ( V vs. SCE )
Pt-Ir/graphene
Pt-Ir/XC-72 與 Pt-Ir/graphene 之性能差異
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35%
0.47 V
QH=64.5 mC/cm2
QH=41.9 mC/cm2
graphene XC-72Pt-Ir + Pt-Ir +
QH
(mC/cm2)Cycle_10 64.5Cycle_50 61.4Cycle_90 61
-0.4 -0.2 0.0 0.2
-10
-8
-6
-4
-2
0
2
4
6
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Cur
rent
den
sity
(mA
/cm
2 )
Cycle : 10
Potential ( V vs. SCE )
Cycle : 50
Pt-Ir/Graphene
Cycle : 90
-0.4 -0.2 0.0 0.2
-10
-8
-6
-4
-2
0
2
4
6
8 Pt-Ir/XC-72
Cur
rent
den
sity
(mA
/cm
2 )
Potential ( V vs. SCE )
Cycle : 10
Cycle : 50 Cycle : 90
QH
(mC/cm2)Cycle_10 41.9Cycle_50 39Cycle_90 35
6% 13%
Pt-Ir/XC-72 與 Pt-Ir/graphene 之性能差異
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1. 我們使用熱裂解法以做出蠻多不同形貌的 Pt-Ir 合金奈米粒子,並成功將其附載於 graphene 或碳球上面,而附載量為我們所希望的 20% 。
2. Pt-Ir/graphene 的氫催化活性面積 (QH) 為 64.5 mC/cm2 大於 Pt-Ir/XC-72 的41.9 mC/cm2 , 活性提升 35% 外,經循環伏安法的圈數增加, Pt-Ir/graphene的耐久性能損耗為 6% 而 Pt-Ir/XC-72 的耐久性能損耗為 13% 。
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Conclusions
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Nano Functional Ceramic Lab.
Thanks for your attention