Kaisi Liu,Bin Yao,Yongfeng Li,Zhanhui Ding,Zhenyu Xiao,Yuhong Jiang,Gang Wang,Daocheng Pan
Cu2CoSnS4 (CCTS) and Cu2NiSnS4 (CNTS) can be regarded as Cu2ZnSnS4 compounds with the Zn2+ replaced by Co2+ and Ni2+, and are alternative absorber materials in thin film solar cells. Here, we fabricated high-quality CCTS and CNTS nanocrystal thin films by employing the ion substitution strategy. We systematically studied the crystal structures, surface morphologies and compositions of the as-prepared and selenized thin films via X-ray diffractometry (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The selenized CCTS and CNTS films showed an obvious phase separation process for the oxidizing reaction of Co2+ and Ni2+ with high-temperature selenium steam, and then formed Cu2Sn(S,Se)3, Co(S,Se)2 and Ni(S,Se)2 compounds. We successfully fabricated photodetector devices using CCTS and CNTS nanocrystal films, and achieved a strong and reversible photoresponse performance.
The practical application of hexagonal ZnIn 2 S 4 (ZIS) as a visible-light photocatalyst for hydrogen (H 2 ) production is hindered by rapid internal charge recombination. In this study, we successfully synthesized Cu 2 CoSnS 4 (CCTS) nanocrystals and loaded them onto the surface of ZIS nanosheets to create a p-n heterojunction photocatalyst. The optimized Cu 2 CoSnS 4 /ZnIn 2 S 4 (CCTS/ZIS) heterojunction exhibited a significantly higher visible-light photocatalytic H 2 evolution rate of 4.90 mmol·g −1 ·h −1 compared to ZIS and CCTS alone. The enhanced photocatalytic efficiency was attributed to improved electron transfer and charge separation at the heterojunction interface. The formation of p-n heterojunction facilitated the accumulation of valence band electrons in ZIS and conduction band holes in CCTS, effectively suppressing the recombination of photogenerated electrons and holes. Theoretical calculations, spectroscopic, and photoelectrochemical characterizations supported the findings. This work presents a promising approach for designing efficient p-n heterojunction semiconductor photocatalysts for practical applications in visible-light-driven hydrogen evolution.
Wenrui Wu,Xing Wang,Xin Wang,Fuxiang Li,Tao Xu,Xianfu Li
The self-supporting binder-free electrode material with a special porous structure and abundant electrochemical active sites is viewed as the ideal electrode material for supercapacitors . In this work, nanoflower-like Cu 2 CoSnS 4 was first constructed on nickel foam (NF) substrate (CCTS/NF) by a one-step solvothermal method. The nanoflower-like shape increases the channels for ion transport and presents a massive quantity of active sites, which is crucial to improving electrochemical performance. What’s more, the significant synergistic effect between the ternary transition metal ions enhances the electrochemical performance as well. As a result, the CCTS/NF-3 performs a standout specific capacitance of 1690 mF cm -2 at 2 mA cm -2 , a perfect rate performance of 79.6% and a superb cycle consistency of 99.6% after 5000 cycles. The assembled asymmetric supercapacitor (ASC) performs a high potential window of 0–1.4 V, a superb energy density of 0.0065 mWh cm -2 at 0.14 mW cm -2 and magnificent capacitance remains (95.6% after 5000 cycles). The electrode material has low acquisition cost and terrific electrochemical performance, and has broad utility possibilities in the supercapacitor market.
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