Aromal M. Vijay, T. Kavinkumar, S. Gobalakrishnan, N. Chidhambaram, Perumal Asaithambi, R. Srinivasan, Arun Thirumurugan
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引用次数: 0
摘要
设计用于能量存储和转换系统的多功能材料对于解决当前的全球能源问题至关重要。在这项工作中,我们通过简单的化学方法和煅烧过程,制备了一种由氧化锌和氧化铌组成的高活性、经济型混合材料,并将其与 g-C3N4 集成在一起(Nb@ZGCN)。在 6 M KOH 电解液中,当电流密度为 1 A g-1 时,Nb@ZGCN 电极的比电容为 122.3 F g-1;当电流密度为 4 A g-1 时,比电容保持在初始值的 71%。即使在 4 A g-1 的条件下循环 2000 次,这种混合电极的循环稳定性也高达 105%,库仑效率也比第一次循环提高了,接近 100%。此外,制备的混合材料还被进一步应用于电催化氢进化反应(HER),在 1 M KOH 介质中提供 252.1 mV 的小过电位,实现 10 mA cm- 2 的电流速率和长期耐久性。混合结构中的氧化锌、氧化铌和氮化石墨碳之间的协同作用产生了丰富的电活性位点,显著提高了超级电容器和氢氧化还原活性。这些结果表明,所开发的混合材料可进一步用作超级电容器和水分离应用的电极材料。
Designing multifunctional Nb2O5 rods with ZnO modified g-C3N4 hybrid material for energy storage and hydrogen evolution
The design of multifunctional materials for energy storage and conversion systems is vital in addressing present global energy issues. In this work, we have prepared a highly active and economical hybrid material comprising ZnO and Nb2O5, integrated with g-C3N4 (Nb@ZGCN) through the simple chemical method followed by calcination process. The resultant Nb@ZGCN electrode delivered a specific capacitance of 122.3 F g−1 at a current density of 1 A g−1 and maintained 71% of its initial value at a current density of 4 A g−1 in a 6 M KOH electrolyte. This hybrid electrode exhibited superb cyclic stability of 105% even after 2000 cycles at 4 A g−1 with an increased coulomb efficiency than the first cycle which is close to 100%. Additionally, the prepared hybrid material was further applied for electrocatalytic hydrogen evolution reaction (HER), delivering a small overpotential of 252.1 mV to achieve a current rate of 10 mA cm− 2 along with long-term durability in a 1 M KOH medium. The synergistic interaction between the ZnO, Nb2O5 and graphitic carbon nitride in the hybrid structure leads to abundant electroactive sites that remarkably improve the supercapacitive and HER activities. These results suggest that the developed hybrid material can be further exploited as an electrode material for supercapacitor and water splitting applications.
期刊介绍:
Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.