氧还原(ORR)反应是发生在燃料电池阴极的化学反应,它十分的关键。作为促进氧还原反应的重要因素,研发出性能优异、耐用的氧还原催化剂是尤为重要的。本文的研究内容着重于氧还原催化剂,并聚焦于氮掺杂石墨烯材料。首先,本文详细讲述了燃料电池的工作原理以及结构组成。还介绍了氧还原反应,以及现阶段几种主流氧还原催化剂的现状与不足,包括Pt基催化剂、过渡金属氧化物、金属碳氮化物、钙钛矿型氧化物催化剂和氮掺杂石墨
Graphene (GN) and related nanomaterials have unique optical,electrical,magnetic,thermal and other properties,and they bring new vitality to the development of A
Inorganic nanocrystals exhibit unique size- and shape-dependent properties and are of great interest in many applications.During the past decades,significant pr
算术表达式的精确计算是确保各类复杂计算正确性的基础.然而,由于计算过程中的舍入误差,现有的计算软件或计算设备经常会出现不可接受,甚至完全错误的计算结果.比如,对于2065
In this paper,a flaw of the Laplace decomposition method is investigated.Based on it a modified Laplace decomposition method is presented,the new algorithm can
本文提出了一种能有效保留模型特征的改进的自适应分层算法.基于模型是否可打印,本文又提出了能有效检测STL文件和CLI文件各种错误的方法.基于Qt和OpenGL,用C++开发了一款分
The purpose of this paper is to investigate the rational univariate representations of zero-dimensional systems involving the interval representation.Let F
A commutative ring R is called K-Hermite if,for any rectangular matrix B∈Mm×n(R)(m≤n),there exists Q∈GLn(R) such that BQ is lower trian-gular.This paper inv