Type-II CuFe2O4/Graphitic Carbon Nitride Heterojunctions for High-Efficiency Photocatalytic and Electrocatalytic Hydrogen Generation
Type-II CuFe2O4/Graphitic Carbon Nitride Heterojunctions for High-Efficiency Photocatalytic and Electrocatalytic Hydrogen Generation
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DOI：
10.1021/acsami.2c11140
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发表时间：
2022-09-22
影响因子：
9.5
通讯作者：
Ahmad, Tokeer
中科院分区：
文献类型：
--
作者：
Mehtab, Amir;Banerjee, Sarbajit;Ahmad, Tokeer
随着氢作为一种越来越重要的储能形式出现，太阳能水分解已成为一项紧迫的任务。g-C3 N4是光催化分解水的理想候选者，由于其带边与水的氧化还原电位的良好对齐。为了减轻限制g-C3 N4性能的电子-空穴复合，我们开发了具有CuFe 2 O 4纳米颗粒（NPs）的g-C3 N4半导体异质结构作为高效光催化剂。采用两种牺牲剂研究了不同CuFe_2O_4负载量的CuFe_2O_4/g-C_3 N_4异质结构的可见光催化性能。观察到CuFe 2 O 4/g-C3 N4异质结构的催化效率比单独的g-C3 N4纳米片提高了2.5倍，H-2产生的表观量子产率接近25%。改进的异质结构的光催化活性表明，引入CuFe 2 O 4 NPs提供更多的活性位点，并减少电子-空穴复合。此外，g-C3 N4/CuFe 2 O 4异质结构与单独的组分相比显示出增强的电催化HER活性，其结果是通过用CuFe 2 O 4制备异质结构g-C3 N4增加了电催化水裂解反应的活性催化表面。所制备的异质结构的增强的法拉第效率使其成为高效制氢的潜在候选者。尽管如此，所设计的异质结构材料表现出显着的光和电催化活性对HER，这表明了一种方法，通过创建异质结构的最佳能量偏移有条不紊地提高催化性能。
Solar water splitting has emerged as an urgent imperative as hydrogen emerges as an increasingly important form of energy storage. g-C3N4 is an ideal candidate for photocatalytic water splitting as a result of the excellent alignment of its band edges with water redox potentials. To mitigate electron-hole recombination that has limited the performance of g-C3N4, we have developed a semiconductor heterostructure of g-C3N4 with CuFe2O4 nanoparticles (NPs) as a highly efficient photocatalyst. Visible-light-driven photocatalytic properties of CuFe2O4/g-C3N4 heterostructures with different CuFe2O4 loadings have been examined with two sacrificial agents. An up to 2.5-fold enhancement in catalytic efficiency is observed for CuFe2O4/g-C3N4 heterostructures over g-C3N4 nanosheets alone with the apparent quantum yield of H-2 production approaching 25%. The improved photocatalytic activity of the heterostructures suggests that introducing CuFe2O4 NPs provides more active sites and reduces electron-hole recombination. The g-C3N4/CuFe2O4 heterostructures furthermore show enhanced electrocatalytic HER activity as compared to the individual components as a result of which by making heterostructures g-C3N4 with CuFe2O4 increased the active catalytic surface for the electrocatalytic water splitting reaction. The enhanced faradaic efficiency of the prepared heterostructures makes it a potential candidate for efficient hydrogen generation. Nevertheless, the designed heterostructure materials exhibited significant photo-and electrocatalytic activity toward the HER, which demonstrates a method for methodically enhancing catalytic performance by creating heterostructures with the best energetic offsets.