Silver cocatalyst-concentration dependence of overall water splitting performance over silver-inserted solid-state heterojunction photocatalyst composed of zinc rhodium oxide and bismuth vanadium oxide
Silver cocatalyst-concentration dependence of overall water splitting performance over silver-inserted solid-state heterojunction photocatalyst composed of zinc rhodium oxide and bismuth vanadium oxide
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DOI：
10.1016/j.apcatb.2020.119744
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发表时间：
2021-05
影响因子：
22.1
通讯作者：
H. Irie;Masaomi Yoda;T. Takashima;Junya Osaki
中科院分区：
文献类型：
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作者：
H. Irie;Masaomi Yoda;T. Takashima;Junya Osaki
我们将银（Ag）作为析氢（H2）助催化剂选择性地负载到作为析氢光催化剂的锌铑氧化物（ZnRh 2 O 4（ZRO））上，在异质结光催化剂中，Ag插入的ZRO和铋钒氧化物（Bi 4V 2 O 11（BVO），ZRO/Ag/BVO）中具有不同量的Ag助催化剂。Ag助催化剂的选择性负载通过光沉积方法通过利用ZRO（1.2eV）和BVO（1.7eV）之间的带隙差来实现，并且沉积的Ag的量通过光沉积时间来控制，以生成具有高达4.0wt%的Ag助催化剂的Ag/ZRO/Ag/BVO。在波长为700 nm的红光照射下，所制备的Ag/ZRO/Ag/BVO催化剂均发生了完全的水分解，促进了H2和O2从水中的化学计量析出。此外，表观量子效率增加到1.1重量%的银助催化剂，然后趋于饱和的测量范围内高达4.0重量%。
We loaded silver (Ag), as a hydrogen (H2)-evolution cocatalyst, selectively onto zinc rhodium oxide (ZnRh2O4(ZRO)), as a H2-evolution photocatalyst, with various amounts of the Ag cocatalyst in a heterojunction photocatalyst, Ag-inserted ZRO and bismuth vanadium oxide (Bi4V2O11(BVO), ZRO/Ag/BVO). The selective loading of the Ag cocatalyst was realized by a photodeposition method by utilizing the bandgap difference between ZRO (1.2 eV) and BVO (1.7 eV), and the amount of deposited Ag was controlled by the photodeposition time to generate Ag/ZRO/Ag/BVO with up to 4.0 wt% of Ag cocatalyst. All the prepared Ag/ZRO/Ag/BVO proceeded overall water splitting under red light irradiation at a wavelength of 700 nm, enhancing the stoichiometric evolutions of H2and O2from water. Also, the apparent quantum efficiency increased up to 1.1 wt% of Ag cocatalyst and then tended to saturate in the measurement range up to 4.0 wt%.