Selective Loading of a Cobalt Species Cocatalyst on an Oxygen-Evolution Photocatalyst in a Silver-Inserted Z-Scheme System Consisting of Bismuth Vanadium Oxide and Zinc Rhodium Oxide for Enhanced Overall Water Splitting and Carbon Dioxide Reduction

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2025-04-14 DOI:10.1021/acsaem.5c0038410.1021/acsaem.5c00384

Hiroshi Irie*, Masaomi Yoda, Toshihiro Takashima and Hiroshi Miyashita,

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引用次数: 0

Abstract

We selectively loaded various amounts of a cobalt species (CoO_x) cocatalyst for oxygen (O₂) evolution on bismuth vanadium oxide (Bi₄V₂O₁₁ (BVO)) as an O₂-evolution photocatalyst in a solid-state photocatalyst, a silver (Ag)-inserted BVO and zinc rhodium oxide (ZnRh₂O₄ (ZRO)) photocatalyst (BVO/Ag/ZRO (BAZ)), to form CoO_x/BAZ. The amount of loaded CoO_x was controlled by changing the photodeposition time to obtain CoO_x/BAZ with up to 0.039 wt % Co vs BAZ. All the prepared CoO_x/BAZ photocatalysts achieved overall water splitting irradiated with red light at a 700 nm wavelength, enhancing the hydrogen (H₂) and O₂ evolutions from water at a ratio of 2:1 compared with bare BAZ. Moreover, the apparent quantum efficiency (AQE) increased up to 0.11% under 700 nm-wavelength light irradiation. CoO_x was demonstrated to function as a cocatalyst enhancing the overall water-splitting activity. It was confirmed that the CoO_x/BAZ photocatalyst reduced carbon dioxide (CO₂) to methane (CH₄) and carbon monoxide (CO) and oxidize water to O₂ using water as an electron donor and proton source under 700 nm-wavelength light. In addition, copper (Cu) was selectively photodeposited as a H₂-evolution cocatalyst on ZRO, a H₂-evolution photocatalyst, in CoO_x/BAZ to form CoO_x/BAZ/Cu. CoO_x/BAZ/Cu further enhanced the water-splitting activity with an AQE of 0.22% under 700 nm-wavelength light irradiation. Moreover, CoO_x/BAZ/Cu reduced CO₂ and oxidized water to produce CH₄ and O₂, without producing CO, under 700 nm-wavelength light irradiation. Cu was confirmed to function as a cocatalyst for enhancing the overall water-splitting reaction and CO₂ reduction to selectively generate CH₄.

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在铋钒氧化物和锌铑氧化物组成的镶银Z-Scheme体系中，钴助催化剂在析氧光催化剂上的选择性负载增强了整体水分解和二氧化碳还原

在固态光催化剂中，我们选择性地在铋钒氧化物（Bi4V2O11 (BVO)）上负载不同数量的钴类（CoOx）析氧助催化剂作为析氧光催化剂，在插入银（Ag）的BVO和氧化锌铑（ZnRh2O4 (ZRO)）光催化剂（BVO/Ag/ZRO (BAZ)）上，形成CoOx/BAZ。通过改变光沉积时间来控制cox的负载量，得到cox /BAZ的Co比BAZ的比例高达0.039 wt %。所有制备的CoOx/BAZ光催化剂在700 nm波长的红光照射下都实现了水的全面分解，与裸BAZ相比，水的氢（H2）和氧的析出率提高了2:1。在700 nm光照射下，表观量子效率（AQE）提高了0.11%。CoOx被证明是一种助催化剂，提高了整体的水分解活性。证实了CoOx/BAZ光催化剂在700 nm波长下，以水为电子供体和质子源，将二氧化碳（CO2）还原为甲烷（CH4）和一氧化碳（CO），并将水氧化为O2。此外，铜（Cu）作为h2 -析出助催化剂选择性地光沉积在CoOx/BAZ中的h2 -析出光催化剂ZRO上，形成CoOx/BAZ/Cu。在700 nm光照射下，CoOx/BAZ/Cu进一步增强了水分解活性，AQE为0.22%。此外，在700 nm光照射下，CoOx/BAZ/Cu还原CO2，氧化水生成CH4和O2，而不产生CO。Cu作为助催化剂，增强了整体的水裂解反应和CO2还原，选择性地生成CH4。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.