With Joonext we have the option to embed a plugin (paid from another party) that allows you to use infinite scroll on your blog categroy lists. The plugin used is the Ajax infinity scroll plugin that you can download from this website. Just install the plugin, and enable it. 

AJAX Infinity is a plugin for Joomla! 3 that replaces Joomla pagination with auto-loading infinite scroll. Instead of clicking on pagination links, you can now simply scroll down to reach more content. The older articles will auto-populate as you scroll down through the page.

AJAX Infinity offers a whole new experience for your Joomla website. Whether you run a blog site or news site your visitor will appreciate this simple new way of navigating through the articles. And it works both for blog category view and featured articles view.

You can set it up to load the articles automatically as you scroll down, or manually by clicking on a button. You can even choose to load a number of pages automatically and the rest manually. And it can be easily styled with CSS to fit your design.

Unlike the other similar extensions, AJAX Infinity is highly optimised. Instead of the whole site, it will only fetch the actual articles asynchronously, which makes it much more responsive and fast. Now it also features improved back functionality, bringing you back to where you left off.