多硫化钼微网格电极的几何弹跳效应对析氢效率提高的研究

MoSx microgrid electrodes with geometric jumping effect for enhancing hydrogen evolution efficiency

气泡的析出行为在电化学析气反应中具有重要作用.为了研究周期性结构对气泡脱离的影响,我们构建了一维线性构造的多硫化钼微网格电极.结果表明,利用该电极上的气泡融合行为释放出的表面能可诱导气泡弹起,从而实现气泡的快速脱离,消除气泡屏蔽效应.基于优选的40μm凹槽宽度,产生的气泡以融合的方式可使得脱附尺寸显著降低(体积减小65%).通过结构调控权衡融合效率和黏附功,可以提升气泡脱附效率,进而降低欧姆电阻,提升电催化性能.该研究结果为新型催化电极结构的合理设计提供了新思路,促进了催化电极在相关领域的应用.

Bubble evolution behaviors play important roles in bubble emission reactions.Here we fabricated one-dimensional(1D)-aligned MoSx microgrids to investigate the influence of the periodic structure on bubble releasing.It is demonstrated that the utilization of the surface energy released during coalescence of bubbles causes them to jump from the electrode,which can be an effective route to eliminate the bubble shielding effect.Under the optimized architecture with 40-μm-wide grooves,the generated bubbles tend to coalesce and release from the electrode with much smaller size(65%less in volume).By balancing the coalescence efficiency and the adhesive work via the architecture engineering,the electrocatalytic performance can be promoted with the rapid bubble removal and lowered ohmic resistance.The results provide new insights into the rational design of novel catalytic electrode architectures and promote their applications in related fields.