Preparation of Cation Exchange Membrane Using Reduce Graphene Oxide as Additive Made of Battery wasteAssalaam Umar Abdurahman, Heru Susanto, Ari Setiawan, Hesti Noviska Darmayanti, Titik Istirokhatun, Abdullah Malik Islam Filardli and I Nyoman WidiasaE3S Web Conf., 655 (2025) 01004DOI: https://doi.org/10.1051/e3sconf/202565501004