Design of Fe-MOF-bpdc deposited with cobalt oxide (CoOx) nanoparticles for enhanced visible-light-promoted water oxidation reaction
Design of Fe-MOF-bpdc deposited with cobalt oxide (CoOx) nanoparticles for enhanced visible-light-promoted water oxidation reaction
复制标题
DOI：
10.1007/s11164-019-04077-8
复制
发表时间：
2020-01
影响因子：
3.3
通讯作者：
Shinya Mine;Zakary Lionet;Haruka Shigemitsu;Takashi Toyao;Tae-Ho Kim;Y. Horiuchi;S. Lee;M. Matsuoka
中科院分区：
文献类型：
--
作者：
Shinya Mine;Zakary Lionet;Haruka Shigemitsu;Takashi Toyao;Tae-Ho Kim;Y. Horiuchi;S. Lee;M. Matsuoka
本工作重点介绍了一种简便的方法，即在Fe-MOF-BPDC上沉积CoOx纳米粒子作为助催化剂，以提高其在可见光照射下的水氧化反应(WOR)的光催化活性，从而生成气态O2。由于该过程所需的软条件，即使在CoOx沉积之后，Fe-MOF-BPDC的骨架结构也保持不变。优化的CoOx@Fe-MOF-bpdc复合材料对可见光驱动的WOR表现出比原始的Fe-MOF-bpdc更高的活性，当CoOx载量为2wt%时，放氧量最大可增加约2倍。对CoOx@Fe-MOF-bpdc可见光驱动WOR的波长依赖性的研究表明，Fe-MOF-bpdc中Fe-oxo团簇的直接光激发对反应的启动起着重要作用。此外，研究还发现，CoOx2-丙醇氧化反应的速率几乎不受CoOx2电子沉积的影响，这表明CoOx2作为一个独特的空穴捕获点，比2电子氧化反应更优先地催化WOR等四电子氧化反应。
This work spotlights the facile method to deposit cobalt oxide (CoOx) nanoparticles as a cocatalyst on Fe-MOF-bpdc to enhance its photocatalytic activity for water oxidation reaction (WOR) under visible light irradiation to evolve gaseous O2. Due to the soft conditions needed for the process developed, the framework structure of Fe-MOF-bpdc was maintained even after the deposition of CoOx. The optimized CoOx@Fe-MOF-bpdc composite showed enhanced activity towards visible-light-driven WOR as compared to pristine Fe-MOF-bpdc, the amount of evolved O2being increased by about 2 times at the maximum with CoOxloading of 2 wt% as Co metal. Investigations on the wavelength dependence of visible-light-driven WOR on CoOx@Fe-MOF-bpdc revealed that the direct photo-excitation of Fe-oxo clusters within Fe-MOF-bpdc plays an important role to initiate the reaction. Furthermore, it was found that the rate of 2-propanol oxidation reaction, which is a typical two-electron oxidation reaction, was hardly affected by CoOxdeposition, suggesting that CoOxacts as a unique hole trapping site and more preferentially catalyse the four-electron oxidation reactions like WOR than the two-electron oxidation reaction.