Insight into the photocatalytic and photothermal effect in plasmon-enhanced water oxidation property of AuTNP@MnOx core-shell nanoconstruct

Diptiranjan Paital, Tarun Bansal, Tannu Kaushik, Gayatri Joshi, S. Sett, Saumyakanti Khatua
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Abstract

Development of robust and efficient photocatalytic constructs for boosting the water oxidation reaction (WOR) is needed for establishing a sunlight-driven renewable energy infrastructure. Here we synthesized plasmonic core-shell nanoconstructs consisting of triangular gold nanoprism (Au-TNP) core with mixed manganese oxide (MnOx) shell for photoelectrocatalytic WOR. These constructs show electrocatalytic WOR with low onset overpotential requirement of 270 mV at pH 10.5. Photoexcitation showed further enhancement of their catalytic activity resulting in ~15% decrease of the onset overpotential requirement along with the generation of photocurrent density of up to 300 µA/cm2. We showed that such light-driven enhancement of AuTNP@MnOx dyad's catalytic activity includes contributions from both photocatalytic (hot carriers driven) and photothermal effects with photothermal effect playing the major role for wavelength between 532 nm and 808 nm. The contribution from the photocatalytic effect is appreciable only for high-energy excitations near the interband region, while the photothermal effect largely dominates for lower energy excitations near the LSPR wavelengths of the dyad.
等离子体增强AuTNP@MnOx核壳纳米结构水氧化性能的光催化和光热效应研究
为了建立阳光驱动的可再生能源基础设施,需要开发强大而高效的光催化结构来促进水氧化反应(WOR)。在这里,我们合成了由三角形金纳米片(Au-TNP)核和混合氧化锰(MnOx)壳组成的等离子体核壳纳米结构,用于光电催化WOR。这些结构显示电催化WOR在pH 10.5下具有低起始过电位要求270 mV。光激发进一步增强了它们的催化活性,导致起始过电位要求降低了约15%,同时产生高达300µA/cm2的光电流密度。我们发现,这种光驱动对AuTNP@MnOx dyad催化活性的增强包括光催化(热载子驱动)和光热效应的贡献,其中光热效应在波长为532 nm和808 nm之间起主要作用。光催化效应的贡献仅对带间附近的高能激发有明显的贡献,而光热效应在双晶的LSPR波长附近的低能量激发中占主导地位。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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