可見光驅動的催化反應已引起廣泛關注,因為它能夠將豐富的太陽能轉化為可及的化學能,例如減少二氧化碳減排的潛力。為了減少二氧化碳減排的潛力,通過使用諸如Ag的等離子材料和諸如CuO的半導體提出了光電化學催化系統。在這項研究中, 我們通過一步一步和兩步過程的電沉積方法設計了CuO裝飾的Ag樹突。檢查溶液中Ag+:Cu2+比的變化以形成CuO裝飾的Ag樹突。在一步的過程中,樹突結構由Ag+:Cu2+比變化:隨著Cu2+比的增加,樹突的形態變短和變密,顏色變暗。在兩步過程中,首先通過兩種方法將Ag樹突形成為主要結構:固定電勢和固定電流過程。形成Ag樹突後,以不同的電流密度執行CuO在Ag樹突上的沉積。通過兩步過程獲得的裝飾有農業樹皮的CuO基本上保持了原始農業樹皮的高度分支結構, 隨著溶液中銅含量增加而變得更粗糙。XRD和XPS方法表明CuO是在Ag樹突上形成的, 沉積在Ag樹上的CuO量增加了較高的Cu2+比例和更長的沉積時間。通過一步和兩步過程獲得的Ag樹突在可見範圍內顯示出寬的等離子體吸收帶, 吸光度由CuO在350-650 nm左右增加。等離子共振導致碳酸氫鹽水溶液中碳酸鹽的強烈SERS信號。隨著CuO含量的增加,碳酸鹽的SERS信號變得更強,這表明樹突表面上的CuO促進了碳酸鹽離子的吸附。因此,碳酸鹽吸收在樹突表面上,並被表面增強作用強烈激發。在這項研究中獲得的這些結果表明,裝飾有CuO的Ag樹皮有望在太陽光照射下降低光電化學CO2。

Visible light-driven catalytic reactions have received widespread attention because of the ability to convert abundant solar energy into accessible chemical energy, such as reducing the overpotential of CO2 reduction. In order to reducing the overpotential of CO2 reduction, photoelectrochemical catalytic system was proposed by using plasmonic materials such as Ag and semiconductors such as CuO. In this study, we designed the CuO decorated Ag dendrites by an electrodeposition method with a one-step and two-step processes. The variation of Ag+:Cu2+ ratios in solutions was examined to form CuO decorated Ag dendrites. In the one-step process, the dendrite structures were varied by the Ag+:Cu2+ ratio: As the Cu2+ ratio increased, the morphologies of dendrites became shorter and denser, and the colour became darker. In a two-step process, the Ag dendrites were first formed as the main structure with two approaches: fixed potential and fixed current processes. After forming the Ag dendrites, the deposition of CuO on Ag dendrites was performed with different current densities. The CuO decorated Ag dendrites obtained by the two-step process basically maintained the highly branched structure of the original Ag dendrites, and became coarser with the increased amount of Cu2+ ratio in the solution. The XRD and XPS methods showed that the CuO was formed on the Ag dendrites, and the amount of CuO deposited on the Ag dendrites increased by the higher Cu2+ ratio and the longer deposition time. The Ag dendrites, obtained by both the one- and the two-step processes, showed the wide plasmonic absorption band in the visible range, and the absorbance increased by the CuO around 350-650 nm. The plasmonic resonance resulted in the strong SERS signals for carbonates in aqueous bicarbonate solutions. The SERS signal of carbonates became stronger as the amount of CuO increased, which suggests that the CuO on the dendrite surfaces promoted the adsorption of carbonate ions. Thus, the carbonates absorbed on the dendrite surface and were strongly excited by the surface-enhancing effect. These results obtained in this study demonstrated that the CuO decorated Ag dendrites were promising for the photoelectrochemical CO2 reduction under solar light irradiation.

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