A highly efficient photocatalytic methanol fuel cell based on non-noble metal photoelectrodes: Study on its energy band engineering via experimental and density functional theory method
A highly efficient photocatalytic methanol fuel cell based on non-noble metal photoelectrodes: Study on its energy band engineering via experimental and density functional theory method
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基于非贵金属光电极的高效光催化甲醇燃料电池：通过实验和密度泛函理论方法研究其能带工程
DOI：
10.1016/j.jpowsour.2020.228756
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发表时间：
2020
影响因子：
9.2
通讯作者：
Xi-Ming Song
中科院分区：
文献类型：
--
作者：
Bingzhi Qian;Qian Xu;Yang Wu;Yu Zhang;Hui Li;Yang Wang;Baoxin Wang;Shuo Li;Xi-Ming Song
光催化燃料电池（PFC）因其能协同转换太阳能和化学能而被认为是一种新能源。采用连续电沉积和水热法在掺氟氧化锡（FTO）上制备了高效ZnO/BiVO 4光阳极。在此基础上，设计并构建了由ZnO/BiVO 4光电阳极和Cu 2 O光电阴极组成的可见光驱动双光电极光催化甲醇燃料电池（PMFC）。电化学测试结果表明，在模拟太阳光照射下，所制备的PMFC的短路电流密度（Jsc）、开路电压（Voc）和最大输出功率（Pmax）分别达到5.18 mA/cm 2、0.82 V和0.91 mW/cm 2。表面光电压（SPV）瞬态反应揭示了半导体异质结中的电荷输运动力学，光电化学实验进一步证实了光诱导甲醇氧化和氧还原过程。在光照条件下，n型ZnO/BiVO 4和p型Cu 2 O之间的内部电位差促使光电阳极上的电子通过外电路转移到光电阴极，与空穴结合产生电能。基于密度泛函理论（DFT）的理论计算，证实了ZnO（002）表面到BiVO 4（001）表面的内建电场。
Photocatalytic fuel cell (PFC) is considered as a new energy source due to its cooperative conversion capacity of both solar energy and chemical energy. In this work, a highly efficient ZnO/BiVO4photoanode is synthesized on fluorine-doped tin oxide (FTO) by continuous electrodeposition and hydrothermal method. Then, a visible-light driven dual photoelectrode photocatalytic methanol fuel cell (PMFC) consisted of the ZnO/BiVO4photoanode and Cu2O photocathode is designed and constructed. Electrochemical results show that the short-circuit current density (Jsc), the open-circuit voltage (Voc) and the maximum power output (Pmax) of the prepared PMFC can reach 5.18 mA/cm2, 0.82 V and 0.91 mW/cm2under simulated solar irradiation, respectively. Surface photovoltage (SPV) transients reveal the charge transporting dynamics in semiconductor heterojunction, and photoelectrochemical experiments further confirmed the light-induced methanol oxidation and oxygen reduction process. Under illumination, an interior potential difference between n-type ZnO/BiVO4and p-type Cu2O actuate the electrons on the photoanode to transfer through the external circuit to photocathode, combining with the holes and generating electricity. The built-in electric field from the ZnO (002) surface to the BiVO4(001) surface is confirmed based on the theoretical calculation of density functional theory (DFT).