Adding code to the category links and

I need to add an attribute to all the category links in all posts on a site I’m building for someone. Is there a simple way of modifying get_category_links ()?

At the moment I’m using this code in the single.php file:

<div class="entry-meta">
         <?php
	// Get the ID of a given category
		$category_id = get_cat_ID( 'Category Name' );
	// Get the URL of this category
		$category_link = get_category_link( $category_id );
		foreach((get_the_category()) as $category)
		{
		echo '<a onclick="tb_remove()" href="'.$category_link.' ">'.$category->cat_name.'</a>' ;
		}
		?>
</div>

However this is outputting the following

<a href="https://www.xxxx.xxx/?cat=0 " onclick="tb_remove()">1960s</a>

Which works to an extent but why is it returning a cat=0?

Is there another way to add onclick=”tb_remove()” to the links?

Any help greatly appreciated as I’m getting worried now that I won’t be able to do it in time