原位/光诱导制备 Zn/ZnO 纳米级异质界面并同时产生太阳能氢,New Journal of Chemistry

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原位/光诱导制备 Zn/ZnO 纳米级异质界面并同时产生太阳能氢
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2023-02-27 , DOI: 10.1039/d2nj05431k
Priti A. Mangrulkar _{1,

2} , Nilesh R. Manwar _{1,

3} , Anushree A. Chilkalwar ₁ , Aparna S. Deshpande ₁ , Sadhana S. Rayalu ₁

Affiliation

在本研究中，我们报告了金属-金属氧化物 (Zn/ZnO) 纳米级异质界面的形成以及伴随的氢气生成。合成过程简单，涉及悬浮在水中的锌纳米粒子 (Zn(NP)) 的光学照明。合成过程中伴随的氢气 (H ₂ ) 释放被发现是线性的，它取决于 Zn/ZnO 纳米界面的生长。相对于 Zn(NP) 逐渐增加的 ZnO 量是 H _{2的限制因素}进化。创建了两种不同的 Zn/ZnO 纳米级异质界面，并在照明过程的两个不同阶段提取了样品。第一个样品从最活跃的光照阶段提取并命名为 Zn(NP)/ZnO-R，具有最高的析氢反应 (HER) 速率。第二个样品，从反应性较低的光照阶段提取并命名为 Zn(NP)/ZnO-S，具有较低的 HER 速率。这些原位（太阳光诱导）样品通过 XRD、HRTEM 和其他方法进行了表征。光电特性和光电化学 (PEC) 研究表明 Zn(NP)/ZnO-R 的最佳光捕获能力和光激发电荷载流子的有效分离，导致显着的 HER 性能。在可见光诱导（原位) 将 Zn(NP) 转化为 Zn(NP)/ZnO-R，同时观察到1115 μmol h ^-1的 HER 速率。事实上，Zn(NP)/ZnO-R 催化剂的光电流密度值明显高于 Zn(NP)/ZnO-S、原始 Zn(NP) 和 ZnO。因此，这项研究为 PEC 应用的 Zn(NP)/ZnO 界面的优化制造提供了新的见解，并伴随着太阳能制氢。

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In situ/photoinduced fabrication of Zn/ZnO nanoscale hetero-interfaces with concomitant generation of solar hydrogen

In the present investigation, we report the formation of a metal–metal oxide (Zn/ZnO) nanoscale heterointerfac with concomitant hydrogen generation. The synthesis process is simple and involves the optical illumination of Zn nanoparticles (Zn(NP)) suspended in water. The concomitant hydrogen (H₂) evolution during synthesis was found to be linear, and it is dependent on the growth of the Zn/ZnO nano interface. The progressively increasing amount of ZnO relative to Zn(NP) was a limiting factor in H₂ evolution. Two different Zn/ZnO nanoscale heterointerfaces were created and samples were extracted at two different stages of the illumination process. The first sample, extracted from the most reactive illumination phase and named Zn(NP)/ZnO-R, had the highest hydrogen evolution reaction (HER) rate. The second sample, extracted from a less reactive illumination phase and named Zn(NP)/ZnO-S, had a lower HER rate. These in situ (solar light-induced) samples were characterized by XRD, HRTEM, and other methods. The optoelectronic features and the photoelectrochemical (PEC) investigations showed the optimal light-harvesting ability of Zn(NP)/ZnO-R and the effective separation of photoexcited charge carriers, leading to remarkable HER performance. During the visible-light-induced (in situ) conversion of Zn(NP) to Zn(NP)/ZnO-R, a concurrent HER rate of 1115 μmol h⁻¹ was observed. Indeed, the photocurrent density value of the Zn(NP)/ZnO-R catalyst is significantly higher than that of Zn(NP)/ZnO-S, pristine Zn(NP), and ZnO. Thus, this study provides new insights into the optimal fabrication of the Zn(NP)/ZnO interface for PEC application with concomitant solar hydrogen generation.

更新日期：2023-02-27

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