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

8

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