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SnNb2O6/NiCo-LDH Z-scheme heterojunction with regulated oxygen vacancies obtained by engineering the crystallinity for efficient and renewable photocatalytic H2 evolution
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2021-07-31 , DOI: 10.1039/d1cy01019k Hui Li 1 , Jingyu Zhang 1 , Ting Yang 1 , Yinshu Wang 1 , Hongyu Gao 1 , Xiaojing Wang 1 , Zhanli Chai 1
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2021-07-31 , DOI: 10.1039/d1cy01019k Hui Li 1 , Jingyu Zhang 1 , Ting Yang 1 , Yinshu Wang 1 , Hongyu Gao 1 , Xiaojing Wang 1 , Zhanli Chai 1
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Designing highly active and durable amorphous photocatalysts for hydrogen evolution via water splitting is still a significant challenge. Weakening of the crystallinity by engineering has been used to prepare four SnNb2O6/NiCo-LDH composites with different crystallinities. Among them, the amorphous–amorphous SnNb2O6/NiCo-LDH (SNO–LDH) Z-scheme heterojunction exhibits abundant oxygen vacancies (Ov). The as-prepared SNO–LDH (10 : 1) catalyst shows an optimal visible-light catalytic H2 production rate of 82.2 μmol h−1 g−1 that is four times greater than that of pure SnNb2O6, and reveals a high renewability (retained rate of 75.1%) after five cyclic experiments, which is attributed to the high efficiency of the photogenerated carrier separation, and the self-recovery of active metal and oxygen vacancies by regulating the crystallinity of the recycled catalysts. This study offers a novel viewpoint into the design of highly active and durable amorphous photocatalysts for use in energy and environmental applications.
中文翻译：
SnNb2O6/NiCo-LDH Z-scheme 异质结与受调控的氧空位通过设计结晶度获得有效和可再生的光催化析氢
设计用于通过水分解析氢的高活性和耐用的无定形光催化剂仍然是一个重大挑战。通过工程弱化结晶度已被用于制备具有不同结晶度的四种 SnNb 2 O 6 /NiCo-LDH 复合材料。其中，非晶-非晶SnNb 2 O 6 /NiCo-LDH（SNO-LDH）Z型异质结表现出丰富的氧空位（O v）。所制备的 SNO-LDH (10 : 1) 催化剂显示出最佳的可见光催化 H 2产率为 82.2 μmol h -1 g -1，是纯 SnNb 2 O 的四倍6 , 经过 5 次循环实验后显示出较高的可再生性（保留率为 75.1%），这归因于光生载流子分离的高效率，以及通过调节回收材料的结晶度来自我恢复活性金属和氧空位催化剂。这项研究为设计用于能源和环境应用的高活性和耐用的无定形光催化剂提供了新的视角。
更新日期：2021-08-16
中文翻译：
SnNb2O6/NiCo-LDH Z-scheme 异质结与受调控的氧空位通过设计结晶度获得有效和可再生的光催化析氢
设计用于通过水分解析氢的高活性和耐用的无定形光催化剂仍然是一个重大挑战。通过工程弱化结晶度已被用于制备具有不同结晶度的四种 SnNb 2 O 6 /NiCo-LDH 复合材料。其中，非晶-非晶SnNb 2 O 6 /NiCo-LDH（SNO-LDH）Z型异质结表现出丰富的氧空位（O v）。所制备的 SNO-LDH (10 : 1) 催化剂显示出最佳的可见光催化 H 2产率为 82.2 μmol h -1 g -1，是纯 SnNb 2 O 的四倍6 , 经过 5 次循环实验后显示出较高的可再生性（保留率为 75.1%），这归因于光生载流子分离的高效率，以及通过调节回收材料的结晶度来自我恢复活性金属和氧空位催化剂。这项研究为设计用于能源和环境应用的高活性和耐用的无定形光催化剂提供了新的视角。
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