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Enhancement of Cocatalyst‐Coated ZnFe2O4 Photoanode Grown In Situ on a Metallic Iron Substrate
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-10-19 , DOI: 10.1002/celc.202001195 Yanjun Yin 1, 2 , Xiaodong Wang 1, 2 , Lei Li 1, 2 , Jinpei Hei 1, 2 , Yang Han 1, 2 , Lei Li 1, 2 , Mingling Li 1, 2
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-10-19 , DOI: 10.1002/celc.202001195 Yanjun Yin 1, 2 , Xiaodong Wang 1, 2 , Lei Li 1, 2 , Jinpei Hei 1, 2 , Yang Han 1, 2 , Lei Li 1, 2 , Mingling Li 1, 2
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MFe2O4 (M=Zn, Cu, Mg, Ca) spinel ferrites, with electronic band gaps between 1.4 and 2.1 eV and containing only earth‐abundant elements, are promising visible‐light‐harvesting materials for photoelectrochemical (PEC) water splitting. In situ growth of semiconducting thin films directly on a metallic substrate usually produced highly mechanical stable photoelectrodes and lower interfacial transfer resistance. Here, we advanced the in‐situ‐grown ZnFe2O4 thin‐film photoanode on a Fe substrate with an optically transparent FeNiOx electrocatalyst, giving a photocurrent of approximately 46 μA cm−2 at 1.23 V vs. RHE, which was 3.5 times larger as compared to pristine Fe/ZnFe2O4. Multiple electrochemical techniques were employed to elucidate the augmented effects of surface modification. Our results suggest that FeNiOx can accelerate the surface charge separation efficiency, thus improving the PEC performance. Additionally, low bulk charge separation efficiency was proposed to be the main hindrance for the ZnFe2O4 photoanode on a metallic Fe substrate.
中文翻译：
金属铁基质上原位生长助催化剂包覆的ZnFe2O4光电阳极的增强
MFe 2 O 4（M = Zn，Cu，Mg，Ca）尖晶石铁氧体的电子带隙在1.4和2.1 eV之间，并且仅包含丰富的地球元素，是有望用于光电化学（PEC）水分解的可见光收集材料。直接在金属基底上原位生长半导体薄膜通常会产生高度机械稳定的光电电极，并且界面阻抗较低。在这里，我们用光学透明的FeNiO x电催化剂在Fe基体上推进了原位生长的ZnFe 2 O 4薄膜光电阳极，在1.23 V vs. RHE时，光电流约为46μAcm -2，RHE为3.5是原始Fe / ZnFe 2的两倍O 4。采用了多种电化学技术来阐明表面改性的增强效果。我们的结果表明，FeNiO x可以加快表面电荷分离效率，从而提高PEC性能。另外，低的电荷分离效率被认为是金属Fe基体上ZnFe 2 O 4光电阳极的主要障碍。
更新日期：2020-11-03
中文翻译：
金属铁基质上原位生长助催化剂包覆的ZnFe2O4光电阳极的增强
MFe 2 O 4（M = Zn，Cu，Mg，Ca）尖晶石铁氧体的电子带隙在1.4和2.1 eV之间，并且仅包含丰富的地球元素，是有望用于光电化学（PEC）水分解的可见光收集材料。直接在金属基底上原位生长半导体薄膜通常会产生高度机械稳定的光电电极，并且界面阻抗较低。在这里，我们用光学透明的FeNiO x电催化剂在Fe基体上推进了原位生长的ZnFe 2 O 4薄膜光电阳极，在1.23 V vs. RHE时，光电流约为46μAcm -2，RHE为3.5是原始Fe / ZnFe 2的两倍O 4。采用了多种电化学技术来阐明表面改性的增强效果。我们的结果表明，FeNiO x可以加快表面电荷分离效率，从而提高PEC性能。另外，低的电荷分离效率被认为是金属Fe基体上ZnFe 2 O 4光电阳极的主要障碍。
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