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Cellulose as Sacrificial Biomass for Photocatalytic Hydrogen Evolution over One‐dimensional CdS Loaded with NiS2 as a Cocatalyst
ChemistrySelect ( IF 2.1 ) Pub Date : 2020-01-27 , DOI: 10.1002/slct.201904840 Chunhe Li 1 , Sara Bonabi Naghadeh 2 , Liping Guo 3 , Ke Xu 2 , Jin Zhong Zhang 2 , Hongmei Wang 3
ChemistrySelect ( IF 2.1 ) Pub Date : 2020-01-27 , DOI: 10.1002/slct.201904840 Chunhe Li 1 , Sara Bonabi Naghadeh 2 , Liping Guo 3 , Ke Xu 2 , Jin Zhong Zhang 2 , Hongmei Wang 3
Affiliation
NiS2 nanoparticles (NPs)‐modified CdS nanowires (NWs) (NiS2/CdS) with varying amount of NiS2 were synthesized via a two‐step approach and characterized for sustainable hydrogen evolution. They showed much higher activity than pristine CdS NWs or NiS2 NPs, with the optimal hydrogen production rate reaching 14.49 mmol⋅h−1⋅g−1 for 40%‐NiS2/CdS with lactic acid as sacrificial agent. Under optimal conditions, hydrogen generation rate of 52.88 μmol⋅h−1⋅g−1 was achieved using single cellulose as sacrificial agent. Photoelectrochemical (PEC) properties of the NiS2/CdS nanocomposites were investigated to gain a better understanding of the mechanism behind the enhanced photocatalytic hydrogen evolution reaction (HER) activity. Furthermore, ultrafast transient absorption (TA) spectroscopy was also employed to investigate the charge carrier dynamics, revealing an exciton lifetime approximately four times shorter in 40%‐NiS2/CdS nanocomposite compared to pristine CdS NWs. These results suggest efficient charge transfer from CdS to NiS2. A possible mechanism for enhanced hydrogen production over NiS2/CdS nanocomposite is proposed.
中文翻译:
纤维素作为牺牲生物质,在NiS2助催化剂负载的一维CdS上光催化制氢
NiS 2纳米粒子(NPs)改性的CdS纳米线(NWs)(NiS 2 / CdS)具有不同的NiS 2量,是通过两步法合成的,并具有可持续的析氢特性。它们表现出比原始的CdS纳米线或NIS高得多的活性2个纳米颗粒,具有最佳氢生产速率达到14.49mmol⋅h -1 ⋅g -1的40%-NiS 2与乳酸作为牺牲剂/ CdS的。在最佳条件下,使用单一纤维素作为牺牲剂,制氢速率达到52.88μmol·h -1· g -1。NiS 2的光电化学(PEC)特性研究了/ CdS纳米复合材料,以更好地了解增强的光催化氢释放反应(HER)活性的机制。此外,超快瞬态吸收(TA)光谱还用于研究载流子动力学,揭示了与原始CdS NW相比,在40%-NiS 2 / CdS纳米复合物中,激子寿命大约短了四倍。这些结果表明从CdS到NiS 2的有效电荷转移。提出了在NiS 2 / CdS纳米复合材料上增强产氢的可能机理。
更新日期:2020-01-27
中文翻译:
纤维素作为牺牲生物质,在NiS2助催化剂负载的一维CdS上光催化制氢
NiS 2纳米粒子(NPs)改性的CdS纳米线(NWs)(NiS 2 / CdS)具有不同的NiS 2量,是通过两步法合成的,并具有可持续的析氢特性。它们表现出比原始的CdS纳米线或NIS高得多的活性2个纳米颗粒,具有最佳氢生产速率达到14.49mmol⋅h -1 ⋅g -1的40%-NiS 2与乳酸作为牺牲剂/ CdS的。在最佳条件下,使用单一纤维素作为牺牲剂,制氢速率达到52.88μmol·h -1· g -1。NiS 2的光电化学(PEC)特性研究了/ CdS纳米复合材料,以更好地了解增强的光催化氢释放反应(HER)活性的机制。此外,超快瞬态吸收(TA)光谱还用于研究载流子动力学,揭示了与原始CdS NW相比,在40%-NiS 2 / CdS纳米复合物中,激子寿命大约短了四倍。这些结果表明从CdS到NiS 2的有效电荷转移。提出了在NiS 2 / CdS纳米复合材料上增强产氢的可能机理。