Citation: Jiansheng Li, Lei Wang, Wansheng You, Meiying Liu, Lancui Zhang, Xiaojing Sang. Catalytic effects of[Ag(H₂O)(H₃PW₁₁O₃₉)]^3- on a TiO₂ anode for water oxidation[J]. Chinese Journal of Catalysis, ;2018, 39(3): 534-541. doi: 10.1016/S1872-2067(17)62973-5 shu

Catalytic effects of[Ag(H₂O)(H₃PW₁₁O₃₉)]^3- on a TiO₂ anode for water oxidation

Institute of Chemistry for Functionalized Materials, Liaoning Normal University, Dalian 116029, Liaoning, China

Received Date: 30 September 2017
Revised Date: 9 November 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (21573099, 21601077, 21573100).

A[H₃Ag^I(H₂O)PW₁₁O₃₉]^3--TiO₂/ITO electrode was fabricated by immobilizing a molecular polyoxometalate-based water oxidation catalyst,[H₃Ag^I(H₂O)PW₁₁O₃₉]^3- (AgPW₁₁), on a TiO₂ electrode. The resulting electrode was characterized by X-ray powder diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. Linear sweep voltammetry, chronoamperometry, and electrochemical impedance measurements were performed in aqueous Na₂SO₄ solution (0.1 mol L^-1). We found that a higher applied voltage led to better catalytic performance by AgPW₁₁. The AgPW₁₁-TiO₂/ITO electrode gave currents respectively 10 and 2.5 times as high as those of the TiO₂/ITO and AgNO₃-TiO₂/ITO electrodes at an applied voltage of 1.5 V vs Ag/AgCl. This result was attributed to the lower charge transfer resistance at the electrode-electrolyte interface for the AgPW₁₁-TiO₂/ITO electrode. Under illumination, the photocurrent was not obviously enhanced although the total anode current increased. The AgPW₁₁-TiO₂/ITO electrode was relatively stable. Cyclic voltammetry of AgPW₁₁ was performed in phosphate buffer solution (0.1 mol L^-1). We found that oxidation of AgPW₁₁ was a quasi-reversible process related to one-electron and one-proton transfer. We deduced that disproportionation of the oxidized[H₂Ag^Ⅱ(H₂O)PW₁₁O₃₉]^3- might have occurred and the resulting[H₃Ag^ⅢOPW₁₁O₃₉]^3- oxidized water to O₂.
- Water oxidation,
- Electrocatalysis,
- Photoelectrochemistry,
- TiO₂,
- Polyoxometalate,
- Ag⁺ complex
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Catalytic effects of[Ag(H₂O)(H₃PW₁₁O₃₉)]^3- on a TiO₂ anode for water oxidation