在本研究中，我們介紹一種尖晶石結構的氧化鋅鈷在ITO或碳紙基底上，並且複合上葉綠體塗層，作為光電極的的高效光電化學水分解材料。氧化鋅鈷是一種p型過渡金屬氧化物半導體，也是非常熱門的尖晶石超級電容器材料，並由於其高電荷存儲容量和結構穩定性的特性而著稱。我們展示透過水熱合成法，並接著在三個不同溫度（300 °C、400 °C和500 °C）下進行退火處理，製備微孔至中孔結構的氧化鋅鈷，呈現出奈米粒子的形態。此外，我們從小球藻中提取葉綠體，並將其塗覆在氧化鋅鈷電極上，以增強光吸收能力，促進水分解過程中的光合作用反應。在405奈米和808奈米雷射光條件下觀察自旋極化率曲線，與電子自旋向上和自旋向下狀態的電流密度變化相互對應。最後，在模擬太陽光條件下，在光電化學裝置中測量施加偏壓電位時的電流密度並進一步計算偏壓光轉換電流效率（ABPE）。可以觀察到隨著氧化鋅鈷孔隙率的提升，明顯提高光電流密度和ABPE。此外，將葉綠體塗覆在氧化鋅鈷上，進而提升其在可見光照射下的PEC性能。而且由於碳紙的優異導電性，碳紙基板在LSV和ABPE性能上比ITO基板更高。光電化學水分解電池展示卓越的氫氣生成性能的ABPE效率，特別是塗覆葉綠體的500 °C氧化鋅鈷碳紙電極。本研究結果顯示，氧化鋅鈷具有巨大潛力來作為一種高效、地球資源豐富且環境友好的金屬氧化物。

In the research, we introduced a high-efficiency photoelectrochemical water splitting material of spinel-structured ZnCo2O4 on ITO or carbon paper substrate as photoelectrode and also coating them with a chloroplast layer. ZnCo2O4 is p-type transition metal oxide semiconductor and the popular spinel supercapacitor material, known for high charge storage capacity and structural stability. We demonstrated the fabrication of microporous to mesoporous ZnCo2O4 through hydrothermal synthesis followed by annealing at three different temperatures: 300 °C, 400 °C, and 500 °C, also showing nanoparticles in morphologies. Furthermore, we extracted the chloroplasts from chlorella to coat on ZnCo2O4 electrodes to enhance light absorption ability, which could also boost the photosynthesis reaction during the water splitting process. The photoelectrodes were prepared using carbon paper (CP) substrate and compared with indium tin oxide (ITO) substrate for photocatalytic performance. Spin polarization curve under incident 405 nm and 808 nm laser beams corresponded to changes in current density regarding the electron spin-up and spin-down states. Eventually, the photoelectrodes were exposed to simulated sunlight to measure the current density upon applied bias voltage in an electrochemical setup, and we further calculated the applied bias photon-to-current efficiency (ABPE). It was observed that increasing the porosity of ZnCo2O4 significantly improved the photocurrent density and ABPE. Additionally, coating the chloroplast with ZnCo2O4 further improved its PEC performance upon exposure to visible light. Moreover, the CP substrate exhibited higher LSV and ABPE performance than the ITO substrate due to its excellent conductivity. The photoelectrochemical water splitting cell showed a splendid ABPE efficiency of hydrogen production performance, especially the chloroplast-coated 500 °C ZnCo2O4 carbon paper electrode. The results presented in this study reflect the huge potential of ZnCo2O4 as an efficient, earth-abundant, and environmentally friendly metal oxide alternative.

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