In this work, an efficient nanoporous BiVO₄ composite photoelectrode with high photocurrent and low onset potential for photoelectrochemical water splitting is achieved through modification of BiVO₄ with a stable heterometallic CoNi-MOF layer. Compared with pristine BiVO₄ anode, the formation of CoNi-MOFs/BiVO₄ increases the photocurrent density by about 260%. In addition, the CoNi-MOFs/BiVO₄ photoanode is of greater steadiness for water oxidation, without insignificant activity attenuation within 3 reaction hours at 1.23 V vs. RHE. It is postulated that bimetal-organic framework CoNi-MOFs could supply more open sites which account for the impressively enhanced PEC performance of BiVO₄ photoanodes toward water splitting under illumination. The results demonstrate a new method to fabricate dual metal nanoparallelepiped-like MOF for steady hydrolysis photoanode material.

在这项工作中，通过使用稳定的杂金属CoNi-MOF层对BiVO ₄进行改性，可以实现具有高光电流和低起始电位的高效纳米多孔BiVO ₄复合光电极，用于光电化学水分解。与原始BiVO ₄阳极相比，CoNi-MOFs / BiVO ₄的形成使光电流密度增加了约260％。此外，CoNi-MOFs / BiVO ₄光电阳极对于水氧化具有更大的稳定性，在相对于RHE的1.23 V的3个反应小时内，活性没有明显降低。据推测，双金属有机框架CoNi-MOF可以提供更多的开放场所，这是BiVO ₄ PEC性能显着提高的原因。朝着在光照下水分解的光阳极。结果证明了一种用于稳定水解光阳极材料的新型双金属纳米平行六面体MOF的制备方法。