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Synergistic Effect of Ni2+ and Fe3+ of Bimetallic Oxyhydroxide NiFeOOH as OER Cocatalyst for Fe2O3 Photoanode with Enhanced Photoelectrochemical Water Splitting
Energy & Fuels ( IF 5.2 ) Pub Date : 2022-02-17 , DOI: 10.1021/acs.energyfuels.1c04113
Yimin Lin 1 , Ai Qin 1 , Wanqing Fang 1 , Rongzi Xv 1 , Li Fu 1
Energy & Fuels ( IF 5.2 ) Pub Date : 2022-02-17 , DOI: 10.1021/acs.energyfuels.1c04113
Yimin Lin 1 , Ai Qin 1 , Wanqing Fang 1 , Rongzi Xv 1 , Li Fu 1
Affiliation
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Hydrogen production via photoelectrochemical water splitting represents one of the sustainable development approaches for future energy. Herein, we demonstrate the fabrication optimization of α-Fe2O3 nanoparticles modified by bimetallic oxyhydroxide NiFeOOH layers. The optimized α-Fe2O3/NiFeOOH photoanode is successfully applied for the photoelectrochemical hydrogen production process. The electrodeposition and annealing process of the α-Fe2O3 nanoparticles are optimized for better photoelectrochemical performance. NiFeOOH layers are subsequently deposited on the surface of the optimized α-Fe2O3 photoanode by the impregnation process. The physical and chemical characterization results show that bimetallic oxyhydroxide NiFeOOH layers are modified on the surface of the α-Fe2O3 nanoparticles with an amorphous form. After optimization, a highly enhanced photocurrent density is achieved in the optimized α-Fe2O3 photoanode with a value of 0.96 mA/cm2, which is 50-fold higher than that of the bare α-Fe2O3 photoanode (0.019 mA/cm2). After NiFeOOH layers were deposited, the photocurrent density of the α-Fe2O3/NiFeOOH photoanode is enhanced to 1.35 mA/cm2 (measured at 1.23 V versus RHE), 1.53-fold and 80-fold higher than those of the optimized α-Fe2O3 and bare α-Fe2O3 photoanodes, respectively. In addition, the α-Fe2O3/NiFeOOH photoanode yields an improved applied bias photon-to-current efficiency of 0.13% (measured at 1.05 V versus RHE), 1.65 times higher than that of the optimized α-Fe2O3 photoanode. Photoelectrochemical and electrochemical characterization confirms that the synergistic effect of Ni2+ and Fe3+ of the NiFeOOH cocatalyst on accelerating the consumption of holes and promoting the surface OER dynamics could improve the efficiency of electron/hole separation and injection in the α-Fe2O3/NiFeOOH photoanode. Therefore, the PEC properties of the α-Fe2O3 photoanode are significantly improved.
中文翻译：
Ni2+ 和 Fe3+ 双金属氢氧化物 NiFeOOH 作为 OER 助催化剂用于具有增强光电化学水分解的 Fe2O3 光阳极的协同效应
通过光电化学水分解制氢代表了未来能源的可持续发展方法之一。在此，我们展示了由双金属羟基氧化物 NiFeOOH 层改性的 α-Fe 2 O 3纳米粒子的制造优化。优化后的α-Fe 2 O 3 /NiFeOOH光阳极成功应用于光电化学制氢过程。优化了α-Fe 2 O 3纳米粒子的电沉积和退火工艺以获得更好的光电化学性能。NiFeOOH 层随后沉积在优化的 α-Fe 2 O 3的表面上通过浸渍过程的光阳极。物理和化学表征结果表明，双金属羟基氧化物NiFeOOH层在α-Fe 2 O 3纳米粒子表面被改性，呈非晶态。优化后，优化后的α-Fe 2 O 3光阳极实现了高度增强的光电流密度，值为0.96 mA/cm 2，比裸α-Fe 2 O 3光阳极（0.019毫安/厘米2 )。沉积NiFeOOH层后，α-Fe 2 O 3 /NiFeOOH光阳极的光电流密度提高到1.35 mA/cm 2（在 1.23 V 与 RHE 下测量），分别比优化的 α-Fe 2 O 3和裸 α-Fe 2 O 3光阳极高 1.53 倍和 80 倍。此外，α-Fe 2 O 3 /NiFeOOH 光阳极产生了 0.13% 的改进的施加偏置光子到电流效率（在 1.05 V 与 RHE 下测量），比优化的 α-Fe 2 O 3高 1.65 倍光阳极。光电化学和电化学表征证实Ni 2+和Fe 3+的协同作用NiFeOOH助催化剂加速空穴消耗和促进表面OER动力学可以提高α-Fe 2 O 3 /NiFeOOH光阳极中电子/空穴分离和注入的效率。因此，α-Fe 2 O 3光阳极的PEC性能显着提高。
更新日期：2022-02-17
中文翻译：
Ni2+ 和 Fe3+ 双金属氢氧化物 NiFeOOH 作为 OER 助催化剂用于具有增强光电化学水分解的 Fe2O3 光阳极的协同效应
通过光电化学水分解制氢代表了未来能源的可持续发展方法之一。在此，我们展示了由双金属羟基氧化物 NiFeOOH 层改性的 α-Fe 2 O 3纳米粒子的制造优化。优化后的α-Fe 2 O 3 /NiFeOOH光阳极成功应用于光电化学制氢过程。优化了α-Fe 2 O 3纳米粒子的电沉积和退火工艺以获得更好的光电化学性能。NiFeOOH 层随后沉积在优化的 α-Fe 2 O 3的表面上通过浸渍过程的光阳极。物理和化学表征结果表明，双金属羟基氧化物NiFeOOH层在α-Fe 2 O 3纳米粒子表面被改性，呈非晶态。优化后，优化后的α-Fe 2 O 3光阳极实现了高度增强的光电流密度，值为0.96 mA/cm 2，比裸α-Fe 2 O 3光阳极（0.019毫安/厘米2 )。沉积NiFeOOH层后，α-Fe 2 O 3 /NiFeOOH光阳极的光电流密度提高到1.35 mA/cm 2（在 1.23 V 与 RHE 下测量），分别比优化的 α-Fe 2 O 3和裸 α-Fe 2 O 3光阳极高 1.53 倍和 80 倍。此外，α-Fe 2 O 3 /NiFeOOH 光阳极产生了 0.13% 的改进的施加偏置光子到电流效率（在 1.05 V 与 RHE 下测量），比优化的 α-Fe 2 O 3高 1.65 倍光阳极。光电化学和电化学表征证实Ni 2+和Fe 3+的协同作用NiFeOOH助催化剂加速空穴消耗和促进表面OER动力学可以提高α-Fe 2 O 3 /NiFeOOH光阳极中电子/空穴分离和注入的效率。因此，α-Fe 2 O 3光阳极的PEC性能显着提高。
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