Изучение влияния микроструктуры Pt/С материалов на электрохимические характеристики полученных на их основе PtCo/С электрокатализаторов
Аннотация
Цель статьи: В работе проведено исследование влияния равномерности пространственного распределения наночастиц Pt по поверхности носителя в Pt/C материалах на микроструктуру и электрохимическое поведение получаемых на их основе PtCo/C катализаторов.
Экспериментальная часть: Для синтеза PtCo/C катализаторов используется метод пропитки Pt/C с последующей термической обработкой в атмосфере Ar/H2.
Выводы: Применение Pt/C материала с массовой долей платины около 20 % и равномерным распределением наночастиц Pt по поверхности углеродного носителя позволяет получить PtCo/C катализатор, активность которого в реакции восстановления кислорода при 0.90 В составляет 1215 А/г (Pt), что превышает аналогичный показатель для коммерческого Pt/C катализатора в 4.8 раза. При этом использование Pt/C материала с неравномерным распределением наночастиц приводит к получению PtCo/C катализатора с крупным размером частиц и низкой величиной активной площади поверхности, что значительно ухудшает его активность в реакции восстановления кислорода.
Скачивания
Литература
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