摘要
针对电解水制氢技术中的关键挑战开发高效、低成本的电催化剂,提出一种新型的自支撑三维电催化剂。在Ni_(40)Zr_(40)Ti_(20)非晶合金前驱体中分别加入3%(原子数分数)的Pt、Pd进行合金化,再结合合金技术制备出具有蜂窝状纳米多孔结构的柔性自支撑纳米多孔/非晶合金复合材料催化剂。Pt合金化后,在10 mA/cm^(2)的电流密度下仅需32 mV过电位,Pd合金化后的多孔材料在10 mA/cm^(2)的电流密度下需52 mV过电位,Pt合金化的效果优于Pd,且多孔PtNi/非晶复合材料电解水析氢性能优于商业Pt/C催化剂。多孔PtNi/非晶复合材料的优异电解水性能得益于其亚微米级的蜂窝多孔结构和海绵状纳米孔结构,这些结构在确保催化剂结构稳定性的同时,暴露出更多的催化活性位点。由于较小的镍原子替代了贵金属晶格位点,引入压缩晶格应变效应,从而优化了氢的吸附能。不仅为开发具有自支撑结构、高灵活性和低铂含量的析氢催化剂开辟了新途径,而且对于深入理解催化过程中的合金效应具有重要的科学意义。
A novel self-supported three-dimensional electrocatalyst is proposed for the development of efficient and low-cost electrocatalysts to address the key challenges in electrolytic water hydrogen production technology. Ni_(40)Zr_(40)Ti_(20) amorphous alloy precursor was alloyed with 3% Pt and Pd, and then combined with the dealloying technique to prepare flexible self-supported nanoporous/amorphous alloy composite catalysts with a honeycomb nanoporous structure. The alloyed Pt material required only 32 mV overpotential at 10 mA/cm^(2) current density, and the alloyed Pd porous material required 52 mV overpotential at a current density of 10 mA/cm^(2), Pt alloying was superior to Pd, and the porous PtNi/amorphous composite HER (hydrogen evolution reaction) performance was better than that of commercial Pt/C catalysts. The excellent electrolytic water performance of the porous PtNi/amorphous composites was attributed to their submicron honeycomb porous structure and sponge-like nanoporous structure, which exposed more catalytically active sites while ensuring the structural stability of the catalyst. Moreover, the compressive lattice strain effect was introduced due to the replacement of noble metal lattice sites by smaller nickel atoms, thus optimising the hydrogen adsorption energy. This not only opens up new avenues for developing hydrogen evolution reaction (HER) catalysts with self-supporting structures, high flexibility, and low platinum content, but also holds significant scientific importance for gaining deeper insights into alloy effects in catalytic processes.
作者
王晶
于一鹏
皮寿熹
罗曦
刘军凯
张建福
WANG Jing;YU Yipeng;PI Shouxi;LUO Xi;LIU Junkai;ZHANG Jianfu(Department of Functional Material Research,Central Iron and Steel Research Institute,Beijing,100081,China;China State Shipbuilding Corporation Limited(CSSC)Engineering Management Center,Beijing,100097,China)
出处
《金属功能材料》
2025年第3期44-49,共6页
Metallic Functional Materials
基金
钢铁研究总院有限公司自主投入青年基金(23020300B)。
作者简介
王晶(1992-),女,博士,高级工程师,E-mail:wangjing2015s@163.com;通信作者:于一鹏(1982-),男,博士,正高级工程师,E-mail:yuyipeng@cisri.com.cn。
