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Core–shell carbon colloid sphere@phosphotungstic acid/CdS as a Z-scheme heterojunction with synergistic adsorption, photothermal and photocatalytic performance
Catalysis Science & Technology ( IF 5 ) Pub Date : 2021-09-06 , DOI: 10.1039/d1cy01140e Yongqian Cui 1 , Zipeng Xing 1 , Meijun Guo 1 , Yalu Qiu 1 , Bin Fang 1 , Zhenzi Li 2 , Yu Wang 3 , Peng Chen 1 , Wei Zhou 1, 2
Catalysis Science & Technology ( IF 5 ) Pub Date : 2021-09-06 , DOI: 10.1039/d1cy01140e Yongqian Cui 1 , Zipeng Xing 1 , Meijun Guo 1 , Yalu Qiu 1 , Bin Fang 1 , Zhenzi Li 2 , Yu Wang 3 , Peng Chen 1 , Wei Zhou 1, 2
Affiliation
Heterojunctions are considered to be one of the most efficient microstructures for promoting charge separation and extending photoresponse. A carbon colloid sphere (C)@phosphotungstic acid (HPW)/cadmium sulfide (CdS) nanoparticle Z-scheme heterojunction was fabricated through a combination of hydrothermal and direct template calcination methods. The CdS nanoparticles are dispersed on the surface of C@HPW uniformly. The resultant C@HPW/CdS heterojunction with a narrowed band gap of ∼1.45 eV extends the photo-response to the visible light and NIR regions, and shows excellent photocatalytic degradation performance for 2,4-dichlorophenol (97%) and a high photocatalytic hydrogen production rate of 578 μmol h−1 g−1, much higher than that of pristine HPW and CdS. The apparent quantum efficiency (AQE) is 1.69% at 420 nm. It can be ascribed to the synergistic effect of the formation of the Z-scheme heterojunction between HPW and CdS favoring spatial charge separation, and C enhancing the adsorption–photothermal effect. After four cycles, the nearly constant photocatalytic performance indicates the high stability of the C@HPW/CdS Z-scheme heterojunction.
中文翻译:
核壳碳胶体球@磷钨酸/CdS作为具有协同吸附、光热和光催化性能的Z型异质结
异质结被认为是促进电荷分离和扩展光响应的最有效的微结构之一。通过结合水热和直接模板煅烧方法制备了碳胶体球(C)@磷钨酸(HPW)/硫化镉(CdS)纳米颗粒Z型异质结。CdS 纳米粒子均匀地分散在 C@HPW 的表面。所得带隙窄至 1.45 eV 的 C@HPW/CdS 异质结将光响应扩展到可见光和 NIR 区域,并对 2,4-二氯苯酚 (97%) 显示出优异的光催化降解性能和高光催化性能。制氢速率为 578 μmol h -1 g -1,远高于原始 HPW 和 CdS。420 nm 处的表观量子效率 (AQE) 为 1.69%。这可以归因于 HPW 和 CdS 之间形成 Z 型异质结的协同效应,有利于空间电荷分离,而 C 增强了吸附-光热效应。四次循环后,几乎恒定的光催化性能表明 C@HPW/CdS Z 型异质结具有高稳定性。
更新日期:2021-09-06
中文翻译:
核壳碳胶体球@磷钨酸/CdS作为具有协同吸附、光热和光催化性能的Z型异质结
异质结被认为是促进电荷分离和扩展光响应的最有效的微结构之一。通过结合水热和直接模板煅烧方法制备了碳胶体球(C)@磷钨酸(HPW)/硫化镉(CdS)纳米颗粒Z型异质结。CdS 纳米粒子均匀地分散在 C@HPW 的表面。所得带隙窄至 1.45 eV 的 C@HPW/CdS 异质结将光响应扩展到可见光和 NIR 区域,并对 2,4-二氯苯酚 (97%) 显示出优异的光催化降解性能和高光催化性能。制氢速率为 578 μmol h -1 g -1,远高于原始 HPW 和 CdS。420 nm 处的表观量子效率 (AQE) 为 1.69%。这可以归因于 HPW 和 CdS 之间形成 Z 型异质结的协同效应,有利于空间电荷分离,而 C 增强了吸附-光热效应。四次循环后,几乎恒定的光催化性能表明 C@HPW/CdS Z 型异质结具有高稳定性。