基于纳米CdS对尿酸的光催化氧化和铜(Ⅱ)配合物对氧的电催化还原的燃料电池性能

以纳米硫化镉薄膜修饰的铟锡氧化物电极(CdS/ITO)作光阳极, 铜(Ⅱ)配合物Cu(phen)(L-Trp)·(H₂O)]⁺(phen=1,10-菲啰啉, L-Trp=L-色氨酸)修饰单壁碳纳米管(SWCNTs)电极作阴极, 构建了光催化尿酸(UA)燃料电池, 并研究了其性能及热处理温度的影响. 结果表明, 在40 ℃以下获得的纳米CdS修饰电极在320~550 nm波长区间显现明显的吸收和光伏响应, 在可见光辐射下能光催化氧化UA; 较高温度的热处理(200~300 ℃)却降低了纳米CdS对UA的光催化氧化活性. Cu(phen)(L-Trp)(H₂O)]⁺/SWCNTs电极在-0.131 V电位下呈现一对准可逆的氧化还原峰, 并能电催化还原O₂和H₂O₂. 此外, 基于UA在CdS/ITO电极上的光催化氧化及O₂在Cu(phen)(L-Trp)(H₂O)]⁺/SWCNTs电极上的电催化还原, 组装了UA(0.2 mmol/L)燃料电池, 其在可见光照射(0.18 mW/cm²)下产生0.52 V开路电压, 13.08 μA/cm²短路光电流, 在0.41 V下呈现的最大功率密度为4.10 μW/cm².

Fabrication and Performance of a Novel Visible Light-driven Fuel Cell Based on Photocatalytic Oxidation of Uric Acid by CdS Nanoparticles and Electrocatalytic Reduction of Oxygen by a Copper(Ⅱ) Complex†

A novel visible light-driven uric acid(UA) fuel cell was preprared by employing CdS nanoparticles modified indium-tin oxide photoanode(CdS/ITO) and Cu(phen)(L-Trp)(H₂O)]⁺(phen=1,10-phenanthrothine and L-Trp=L-tryptophan) modified single-walled nanotubes(SWCNTs) cathode. The CdS nanoparticles obtained after thermal treatment at 40 ℃ show obvious absorption and open-circuit photovoltage responses between 320 and 550 nm. The CdS/ITO electrode exhibits good photocatalytic activity towards the oxidation of uric acid(UA) upon visible light irradiation. The CdS nanoparticles prepared at high temperatures between 200 and 300 ℃ show smaller photocatalytic activities than those obtained at 40 ℃. The Cu(phen)(L-Trp)·(H₂O)]⁺/SWCNTs electrode exhibits a pair of quasi-reversible redox peaks at the formal potential of -0.131 V, indicating the electrocatalytic activity towards the reduction of both O₂ and H₂O₂. Furthermore, on the basis of photocatalysis of CdS nanoparticles and electrocatalysis of Cu(phen)(L-Trp)(H₂O)]⁺, a photocatalytic UA(0.2 mmol/L) fuel cell was elaborately assembled, which showed an open-circuit photovoltage of 0.52 V, a short-circuit photocurrent of 13.08 μA/cm² and a maximum power density of 13.08 μW/cm² at 0.41 V upon the visible light irradiation of 0.18 mW/cm².