<br>用于等离子体光催化的柔性纳米片：微波辅助有机合成Ni–NiO@Ni2CO3(OH)2核–壳@片杂化纳米结构,Nanoscale Advances

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用于等离子体光催化的柔性纳米片：微波辅助有机合成Ni–NiO@Ni2CO3(OH)2核–壳@片杂化纳米结构
Nanoscale Advances ( IF 4.6 ) Pub Date : 2023-11-03 , DOI: 10.1039/d3na00583f
Ekta Rani ₁ , Parisa Talebi ₁ , Terhi Pulkkinen ₁ , Vladimir Pankratov ₂ , Harishchandra Singh ₁

Affiliation

可见光活性镍基等离子体光催化剂为贵金属提供了一种经济高效的替代品。然而，它们的稀有性、脆弱性和有限的理解带来了挑战。这项工作提出了一种微波辅助有机合成Ni–NiO@Ni ₂ CO ₃ (OH) ₂核壳@片状等离子体光催化剂。通过采用时间和功率依赖性合成，该催化剂呈现出包裹Ni-NiO结构的柔性Ni ₂ CO ₃ (OH) ₂纳米片，超越了原始的Ni@NiO/NiCO ₃核壳结构。化学反应机制表明，原始 Ni–NiO/NiCO ₃纳米结构的辐照导致非晶态 NiCO ₃断裂为 Ni ²⁺和 CO ₃ ²⁻ ，进一步在水溶剂存在下与 OH ^-离子相互作用，从而产生 Ni 2+ 和 CO 3 2− 。形成Ni(CO ₃ )·Ni(OH) ₂ 。凭借增强的光吸收和光催化性能，所得核壳@片光催化剂的析氢反应产率（40 μmol g ^-1 h ^-1 ）是原始催化剂（20 μmol g ^-1 h ^-1 ）的两倍。 H ₂产率的提高归因于柔性片、跨维光催化剂结构、表面反应表面积的增加以及Ni ₂ CO ₃ (OH) ₂更高的H ₂活性。这项研究展示了微波辅助合成在开发具有优异的太阳能水分解性能的柔性纳米片方面的潜力。

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Flexible nanosheets for plasmonic photocatalysis: microwave-assisted organic synthesis of Ni–NiO@Ni2CO3(OH)2 core–shell@sheet hybrid nanostructures

Visible light-active nickel-based plasmonic photocatalysts provide a cost-effective alternative to noble metals. However, their rarity, fragility, and limited understanding pose challenges. This work presents a microwave-assisted organic synthesis of a Ni–NiO@Ni₂CO₃(OH)₂ core–shell@sheet plasmonic photocatalyst. By employing time and power dependent synthesis, this catalyst exhibits flexible Ni₂CO₃(OH)₂ nanosheets enveloping the Ni–NiO structure, surpassing the pristine Ni@NiO/NiCO₃ core–shell counterpart. Chemical reaction mechanisms suggest that irradiation of pristine Ni–NiO/NiCO₃ nano structures leads to breakage of amorphous NiCO₃ to Ni²⁺ and CO₃²⁻, which further, in the presence of water solvent, interacts with OH⁻ ions leading to the formation of Ni(CO₃)·Ni(OH)₂. With enhanced light absorption and photocatalytic properties, the resulting core–shell@sheet photocatalyst demonstrates double the hydrogen evolution reaction yield (40 μmol g⁻¹ h⁻¹) compared to the pristine catalyst (20 μmol g⁻¹ h⁻¹). The enhanced H₂ yield is attributed to the flexible sheets, cross-dimensional photocatalyst structure, increased surface area for surface reactions, and higher H₂ activity of Ni₂CO₃(OH)₂. This research showcases the potential of microwave-assisted synthesis in developing flexible nanosheets with superior solar water splitting performance.

更新日期：2023-11-03

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