面向燃料电池双极板的不锈钢表相掺杂耐蚀性高通量计算与分析
High-throughput calculation and analysis of surface corrosion resistance of doped stainless steel for bipolar plates in fuel cell
张浩明 1张頔 1徐竹田 1彭林法 1来新民1
作者信息
- 1. 上海交通大学上海市复杂薄板结构数字化制造重点实验室,上海 200240;上海交通大学机械系统与振动国家重点实验室,上海 200240
- 折叠
摘要
通过基于密度泛函理论(DFT)的第一性原理高通量计算,筛选了可以提高不锈钢双极板钝化层在PEMFCs工作环境中的耐蚀性的掺杂元素.基于Cr2O3的(10 12)切面构建计算模型,对其进行了 48种元素的掺杂替换,考虑228种掺杂构型.根据掺杂结构和位移能量、掺杂元素被分为4类,并采用不同的吸附、空位计算方案.根据不同掺杂类型采用不同的吸附、空位计算方案,计算了每种掺杂元素对功函数、F的吸附能和Cr/O的空位形成能的影响.计算结果显示,C、N、In、Ru对于不锈钢钝化层的各项耐蚀性参数提升效果较好;Au、Rh、Pt、Ir、Co、Ni也能较好地提升耐蚀性,但是存在成本高或者危害质子膜的问题;Ag、Cu、Sn、Ge可以抑制空位形成和F吸附,但会造成功函数下降;Zn可以提高功函数并抑制F吸附.此外,对于电子态密度的计算表明,掺杂原子与Cr原子形成的稳定键合是耐蚀性参数提升的重要因素.
Abstract
Via high-throughput first principle calculations based on density functional theory(DFT),doping elements that can improve the corrosion resistance of stainless steel bipolar plates'passivation layer in PEMFCs working environment were screened.Calculation models were constructed based on the(10 12)facet of Cr2O3,and 48 elements were doped and 228 doping structures were considered.According to the doping structure and displacement energy,the doping elements were divided into 4 doping types,so that different adsorption and va-cancy schemes were adopted.Then the effects of each doping element on the work function,F adsorption energy and Cr/O vacancy formation energy were calculated.The calculation result shows that C,N,In,and Ru can im-prove all the corrosion resistance parameters of the stainless steel passivation layer;Au,Rh,Pt,Ir,Co and Ni can also effectively improve the corrosion resistance,but there are problems such as price or harm to the proton membrane;Ag,Cu,Sn,and Ge can inhibit vacancy formation and F adsorption,but reduce the work function;Zn can improve the work function and inhibit F adsorption.In addition,the calculation of the electronic density of states shows that the stable bonding formed between the doping atom and the Cr atoms is an important factor for the improvement of the corrosion resistance parameters.
关键词
高通量计算/不锈钢/双极板/耐蚀性/第一性原理计算Key words
High-throughput calculation/Stainless steel/Bipolar plate/Corrosion resistance/First principle calculation引用本文复制引用
基金项目
国家重点研发计划(2020YFB1505901)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据