The all-vanadium photoelectrochemical cell is one of the promising solar energy storage technologies. However, conventional photoanodes surfer from low solar energy utilization efficiency as a result of narrow spectru...The all-vanadium photoelectrochemical cell is one of the promising solar energy storage technologies. However, conventional photoanodes surfer from low solar energy utilization efficiency as a result of narrow spectrum response and poor mass transfer.Hence, in this study, a microfluidic all-vanadium photoelectrochemical cell with a full-spectrum-responsive Ti2O3 photoanode was proposed for efficient solar energy storage. Experimental results indicated that the Ti2O3 photoanode responded to almost the full spectrum of sunlight and exhibited excellent photoresponse and operation stability, which facilitated efficient solar energy utilization. Additionally, the effects of the light intensity, vanadium ion concentration, and electrolyte flow rate were studied. It was found that increasing the light intensity and vanadium ion concentration and reducing the electrolyte flow rate promoted photoelectrochemical reactions and thus improved the solar energy storage performance. The obtained results demonstrate the feasibility and superiority of using Ti2O3 as the photoanode for a photoelectrochemical cell to achieve efficient solar energy storage.展开更多
利用硅溶胶/热空气复合活化法改性石墨毡,并对其表面形貌、微观结构以及电化学性能进行了分析研究。结果表明:硅溶胶/热空气复合活化使石墨毡电极的亲液性增强、比表面积增大、氧官能团数量提升,由此组装的钒电池电化学性能显著提高;活...利用硅溶胶/热空气复合活化法改性石墨毡,并对其表面形貌、微观结构以及电化学性能进行了分析研究。结果表明:硅溶胶/热空气复合活化使石墨毡电极的亲液性增强、比表面积增大、氧官能团数量提升,由此组装的钒电池电化学性能显著提高;活化后石墨毡表面的C—O氧官能团是钒电池氧化还原反应的有效活性位点,当硅溶胶添加量为50%(质量分数)时,石墨毡表面的C—O氧官能团数量达到4.18%;当电流密度为40 m A/cm^2时,以硅溶胶添加量50%的石墨毡为电极组装钒电池,其库仑效率达到95.58%,能量效率达到86.07%,电压效率达到92.35%,比未活化石墨毡为电极组装的钒电池分别高出10.93%、9.16%、3.22%。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.51576021,51620105011,51776026)the Program for Backup Talent Development of Chongqing University(Grant No.CQU2017HBRC1A01)the Fundamental Research Funds for the Central Universities(Grant No.2018CDXYDL0001)
文摘The all-vanadium photoelectrochemical cell is one of the promising solar energy storage technologies. However, conventional photoanodes surfer from low solar energy utilization efficiency as a result of narrow spectrum response and poor mass transfer.Hence, in this study, a microfluidic all-vanadium photoelectrochemical cell with a full-spectrum-responsive Ti2O3 photoanode was proposed for efficient solar energy storage. Experimental results indicated that the Ti2O3 photoanode responded to almost the full spectrum of sunlight and exhibited excellent photoresponse and operation stability, which facilitated efficient solar energy utilization. Additionally, the effects of the light intensity, vanadium ion concentration, and electrolyte flow rate were studied. It was found that increasing the light intensity and vanadium ion concentration and reducing the electrolyte flow rate promoted photoelectrochemical reactions and thus improved the solar energy storage performance. The obtained results demonstrate the feasibility and superiority of using Ti2O3 as the photoanode for a photoelectrochemical cell to achieve efficient solar energy storage.
文摘利用硅溶胶/热空气复合活化法改性石墨毡,并对其表面形貌、微观结构以及电化学性能进行了分析研究。结果表明:硅溶胶/热空气复合活化使石墨毡电极的亲液性增强、比表面积增大、氧官能团数量提升,由此组装的钒电池电化学性能显著提高;活化后石墨毡表面的C—O氧官能团是钒电池氧化还原反应的有效活性位点,当硅溶胶添加量为50%(质量分数)时,石墨毡表面的C—O氧官能团数量达到4.18%;当电流密度为40 m A/cm^2时,以硅溶胶添加量50%的石墨毡为电极组装钒电池,其库仑效率达到95.58%,能量效率达到86.07%,电压效率达到92.35%,比未活化石墨毡为电极组装的钒电池分别高出10.93%、9.16%、3.22%。
