Increased photocatalytic hydrogen evolution and stability over nano-sheet g-C3N4 hybridized CdS core@shell structure
Increased photocatalytic hydrogen evolution and stability over nano-sheet g-C3N4 hybridized CdS core@shell structure
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与纳米片 g-C3N4 杂化 CdS 核@壳结构相比，光催化析氢能力和稳定性更高
DOI：
10.1016/j.ijhydene.2017.02.171
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发表时间：
2017-07
影响因子：
7.2
通讯作者：
Zhang Zisheng
中科院分区：
文献类型：
--
作者：
Liu Li;Hu Panru;Cui Wenquan;Li Xingang;Zhang Zisheng
采用化学吸附法合成了一种新型可见光活性CdS@ g-C3 N4光催化剂。该核壳结构催化剂在可见光（λ ≥ 420 nm）照射下具有较高的光催化产氢活性。将g-C3 N4纳米片成功地包覆在CdS纳米颗粒上，并使其与CdS纳米颗粒紧密接触。当杂化材料中g-C3 N4含量为3 wt. %时，CdS@ g-C3 N4的产氢速率分别是纯CdS和体相g-C3 N4的2.5倍和2.2倍。在循环运行中也观察到上级的稳定性。稳定性和活性的提高归因于π-共轭g-C3 N4材料传输光生空穴的能力。核壳结构促进了光生电子-空穴对的分离，加快了空穴从CdS价带的迁移速度。这种效果还导致大大提高的氢气产生量。初步探讨了CdS@ g-C3 N4光催化活性和稳定性的可能机理。
A novel visible-light-active CdS@g-C3N4photocatalyst was synthesized via a chemisorption method. This core@shell structure catalyst exhibited enhanced photocatalytic H2production activity under visible-light (λ ≥ 420 nm) irradiation. The nano-sheet g-C3N4was successfully coated on CdS nanoparticles with intimate contact. When the content of g-C3N4in the hybridized composite is 3 wt. %, the hydrogen-production rate of the CdS@g-C3N4is 2.5 and 2.2 times faster than pure CdS and bulk g-C3N4, respectively. Superior stability was also observed in the cyclic runs. The improvement in stability and activity result from the ability of the π-conjugated g-C3N4material in transporting photo-induced holes. The core@shell structure promoted separation of the photo-generated electron-hole pair and accelerated the emigration speed of the hole from the valence band of CdS. This effect also results in a greatly improved amount of hydrogen production. The possible mechanism for the photocatalytic activity and stability of CdS@g-C3N4are tentatively proposed.
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