指導教授：王聖璋 博士報告人 : 林恩賢

112/04/20

Nano Functional Ceramic Lab.

No.8

•前言

•實驗步驟

•結果與討論

•結論

•未來工作

Outline

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前言

• Regenerative fuel cell (RFC) is an energy storage and conversion system, which mainly consists of two separated subsystems: a fuel cell and a water electrolyzer. When the two subsystems are integrated into one unit, RFC becomes a unitized regenerative fuel cell (URFC) with a more compact configuration.

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質子交換膜燃料電池 固態電解質電解器+

單一化可再生式燃料電池

Oxygen electrocatalysts Hydrogen electrocatalysts

Pt–Ir Pt/C

Pt–Ru–Ir Pt-Ru/C

Pt–IrO2 Pt-Ru-HxWO3/C

Pt–IrO2–RuO2 　

• Pt generally functions as an active catalyst in ORR, while the others serve as active catalysts in OER .

• 雙金屬觸媒必須具備之條件 :

• 1. 具有高比表面積• 2. 必須有良好的導電性

• 對於效率提升有明顯差異的單元件有，雙極板以及膜電極組、觸媒等…。

實驗步驟

(molar ratio Ir:IrO2=3:7)

(molar ratio Ir:Pt=1:1)

Ir IrO2

Size 1.4nm 6.4nm

• These results reveal that Ir NPs are uniformly dispersed on the surface of IrO2 NPs and covered considerable portion of IrO2 surface area.

結果與討論

Ir (JCPDS: 06-0598)

IrO2(JCPDS:15-0807)

(111)

(200) (311)

(101)

(220) (200)

• The corresponding relative contents of Pt, Ir elements are 67.6 mol%,32.4 mol%.

• The relative-contents are calculated to be 33.5 mol% Ir and 66.5 mol% IrO2

• Pt/Ir-IrO2 catalyst has been fabricated by depositing Pt on Ir-IrO2 that was obtained through IrO2 surface modification with metallic Ir.

• The electrocatalytic activity of Pt/Ir-IrO2 towards ORR is higher than that of Pt/IrO2 , and the electrocatalytic activity of Pt/Ir-IrO2 towards OER can be comparable to that of Pt/IrO2 .

• This kind of the structure of Pt/Ir-IrO2 catalyst is beneficial for the stability of Pt because of the interaction between Pt NPs and Ir NPs, which can effectively prevent Pt from agglomerating.

• This study may open a new concept to design highly active yet stable Pt-based bifunctional oxygen catalyst for URFC.

結論

A CB

(A) Cl3Ir:OA=1:15 (mmol) , 310oC(B) 290oC(C)270oC

A B

(A)Cl3Ir:OLA=1:10 mmol (B) Cl3Ir:OLA=1:10mmol , 添加 TOP 2mmol

未來工作

• Pt-Ir 合成。• Ir,Pt-Ir 奈米粒子電化學分析• Paper review

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