低铼钼合金力学性能的研究

研究了 粉末冶 金方法制 取的 Ｍｏ３ ％ Ｒｅ 合金的 力学性 能。结果 表明,与纯 Ｍｏ 材 料及用干混法制取 的 Ｍｏ３ ％ Ｒｅ 合金 相比,干 湿混合法 制取的 Ｍｏ３ ％ Ｒｅ 合金具有 较高的 抗拉强度 和再结晶开始温度 。在９００ ～１ ４００ ℃ 退火温度 范围内, Ｍｏ３ ％ Ｒｅ 合 金丝 材试 样的 抗 拉强 度与 退 火温 度的关系具有 显著的线 性回归 特征。 Ｍｏ３ ％ Ｒｅ 合 金丝样 的再结晶 开始温度 约为１ ２００ ℃。     

含钌含铼阳极泥处理工艺研究

针对某含钌含铼电解阳极泥,采用"酸性氧化浸出—碱焙烧—水浸"法处理。考察了氧化浸出酸度、温度、液固比、氧化剂用量、搅拌速率、浸出时间对铼浸出率的影响。结果表明,在盐酸浓度2mol/L、85℃、液固比L/S=4、氧化剂用量为理论量的1.4倍、搅拌速率200r/min、浸出时间2.5h的条件下,铼的浸出率可达99%以上,而钨、钽、钌接近100%留于浸出渣中,实现铼与钨、钽、钌的分离。氧化浸出渣采用传统"碱氧化焙烧—水浸—蒸馏"法处理,实现钌与钨、钽的分离,蒸馏后液及水浸渣可分别回收钨、钽。     

Rhenium Suppresses Iridium (IV) Oxide Crystallization and Enables Efficient,Stable Electrochemical Water Oxidation

IrO₂ as benchmark electrocatalyst for acidic oxygen evolution reaction (OER) suffers from its low activity and poor stability. Modulating the coordination environment of IrO₂ by chemical doping is a methodology to suppress Ir dissolution and tailor adsorption behavior of active oxygen intermediates on interfacial Ir sites. Herein, the Re-doped IrO₂ with low crystallinity is rationally designed as highly active and robust electrocatalysts for acidic OER. Theoretical calculations suggest that the similar ionic sizes of Ir and Re impart large spontaneous substitution energy and successfully incorporate Re into the IrO₂ lattice. Re-doped IrO₂ exhibits a much larger migration energy from IrO₂ surface (0.96 eV) than other dopants (Ni, Cu, and Zn), indicating strong confinement of Re within the IrO₂ lattice for suppressing Ir dissolution. The optimal catalysts (Re: 10 at%) exhibit a low overpotential of 255 mV at 10 mA cm⁻² and a high stability of 170 h for acidic OER. The comprehensive mechanism investigations demonstrate that the unique structural arrangement of the Ir active sites with Re-dopant imparts high performance of catalysts by minimizing Ir dissolution, facilitating *OH adsorption and *OOH deprotonation, and lowering kinetic barrier during OER. This study provides a methodology for designing highly-performed catalysts for energy conversion.