Metal–organic Framework-Derived CoSx/NiS Co-Decorated Heterostructures: Toward Simultaneous Acceleration of Charge Carrier Separation and Catalytic Kinetics
Metal–organic Framework-Derived CoSx/NiS Co-Decorated Heterostructures: Toward Simultaneous Acceleration of Charge Carrier Separation and Catalytic Kinetics
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DOI：
10.1021/acsaem.2c02906
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发表时间：
2022-12
影响因子：
6.4
通讯作者：
Pingji Ge;Tianxiang Hang;Yueyue Wu;Shuoren Li;Xingxing Meng;Chuanping Li
中科院分区：
文献类型：
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作者：
Pingji Ge;Tianxiang Hang;Yueyue Wu;Shuoren Li;Xingxing Meng;Chuanping Li
设计基于半导体的异质结以实现高效的电子-空穴分离和快速的催化动力学对于提高光电化学水氧化性能具有重要意义。在本论文中，我们通过原位金属有机骨架(MOF)衍生的方法合成了一种双共催化剂修饰的异质结构(TiO2CoS/CoSx/NiS)。CoSx/NiS的均匀分散得益于原子金属结构块的MOF衍生，显著加快了催化动力学，降低了水氧化过程的过电位。同时，由于形成了定向电磁场和较窄的禁带宽度，CONI MOF法制备的二氧化钛/硫化镉异质结同时改善了电子-空穴分离，扩大了吸收范围。所制备的TiO2/CDS/CoSx/NiS具有优良的光电化学水氧化性能，光电流密度高达5.10 mA/cm2。O2的实际产率约为22.25mol.h-1·cm-2，高于TiO2CONiMOF(18.69mol.h-1·cm-2)和裸μ(13.80mol.h-1·cm-2)。这项研究为高质量双助催化剂的生长和分散提供了一种有前途的解决方案，并为裂水系统的商业实现铺平了道路。
Designing semiconductor-based heterojunctions for achieving high-efficiency electron–hole separation and rapid catalytic kinetics is highly important for promoting photoelectrochemical water oxidation performance. Herein, we synthesize a dual-cocatalyst-decorated heterostructure (TiO2/CdS/CoSx/NiS) via in situ metal–organic framework (MOF) derivation. The homogeneous dispersion of CoSx/NiS, benefiting from the MOF derivation of atomic metal building blocks, significantly accelerates the catalytic kinetics and decreases the overpotential of the water oxidation process. Meanwhile, the CoNi MOF-derived TiO2/CdS heterojunctions simultaneously improve the electron–hole separation and extend the absorption range due to the formation of an oriented electromagnetic field and narrow bandgap of CdS. The as-prepared TiO2/CdS/CoSx/NiS exhibits excellent performance toward photoelectrochemical water oxidation with a photocurrent density of up to 5.10 mA/cm2. The practical production rate of O2is about 22.25 μmol·h–1·cm–2, which is higher than those of TiO2/CoNi-MOF (18.69 μmol·h–1·cm–2) and bare TiO2(13.80 μmol·h–1·cm–2). This study offers a promising solution to tailor the growth and dispersion of high-quality dual-cocatalysts and paves the way toward the commercial realization of water-splitting systems.