安徽工程大学蒯龙团队开发出了用于传质强化电解纯水的多孔空心Ir基催化剂的微滴受限合成和调节策略。相关研究成果于2024年2月7日发表在国际知名学术期刊《科学通报》。

最大限度地利用铱催化剂的活性位点，对于构建用于绿色H₂生产的低成本质子交换膜（PEM）电解槽至关重要。

该文中，研究人员报道了一种新的微滴受限聚变/爆破（MCFB）策略，通过从NaNO₃/葡萄糖混合物中引入爆炸性气体介质来制备多孔中空IrO1-x微球（IrO1-x-PHM）。此外，所开发的MCFB策略被证明是合成一系列Ir基复合材料的通用策略，包括Ir–Cu、Ir–Ru、Ir-Pt、Ir-Rh、Ir-Pd和Ir-Cu–Pd以及其他贵金属，如Rh、Ru和Pt。可以使用不同的有机物和NaNO₃调节中空结构。

以IrO_1-x PHM作为阳极催化剂（0.5mg/cm²）的组装PEM电解槽在1和2A/cm²的电流密度下分别显示出1.593和1.726V的令人印象深刻的极化电压，优于商业IrO_x催化剂和大多数有史以来报道的具有如此低催化剂负载量的铱催化剂。更重要的是，极化损耗的击穿表明，性能的提高是由于中空度促进了质量传输。

该项研究为PEM电解槽及其他电解槽制造高效Ir基催化剂提供了一个通用平台。

附：英文原文

Title: Microdrop-confined synthesis and regulation of porous hollow Ir-based catalysts for the mass transfer-enhanced electrolysis of pure water

Author: anonymous

Issue&Volume: 2024/02/07

Abstract: Maximally exploiting the active sites of iridium catalysts is essential for building low-cost proton exchange membrane (PEM) electrolyzers for green H2 production. Herein, we report a novel microdrop-confined fusion/blasting (MCFB) strategy for fabricating porous hollow IrO1x microspheres (IrO1x-PHM) by introducing explosive gas mediators from a NaNO3/glucose mixture. Moreover, the developed MCFB strategy is demonstrated to be general for synthesizing a series of Ir-based composites, including Ir–Cu, Ir–Ru, Ir–Pt, Ir–Rh, Ir–Pd, and Ir–Cu–Pd and other noble metals such as Rh, Ru, and Pt. The hollow structures can be regulated using different organics with NaNO3. The assembled PEM electrolyzer with IrO1x-PHM as the anode catalyst (0.5 mg/cm2) displays an impressive polarization voltage of 1.593 and 1.726 V at current densities of 1 and 2 A/cm2, respectively, outperforming commercial IrOx catalysts and most of the ever-reported iridium catalysts with such low catalyst loading. More importantly, the breakdown of the polarization loss indicates that the improved performance is due to the facilitated mass transport induced by the hollowness. This study offers a versatile platform for fabricating efficient Ir-based catalysts for PEM electrolyzers and beyond.

DOI: 10.1016/j.scib.2024.02.002

Source: https://www.sciencedirect.com/science/article/abs/pii/S2095927324000719