While the majority of open access journals publish articles for free, many of the most well-known open access publishers do require that authors pay an Article Processing Charge (APC) to offset the cost of publication. The ASU Library is able to provide discounts on APCs with certain publishers as a result of the following partnerships and subscriptions:
ECS has provided these directions: How to publish open access with ECS
Some funding agencies will allow these charges to be paid from grant funds, but of course, not all authors are funded. Many publishers will grant a waiver of the APC upon request if the author is not able to pay, so it is always worth checking to see if that’s a possibility. In addition, there are other ways you can make your work openly available for free.