The seminar at NTU MSE, hosted by Assistant Professor Eason Chen Yi-Sheng, highlighted the critical advancements in green hydrogen production focusing on catalyst design, photoelectrode engineering, and scalable manufacturing. Dr. Doudou Zhang from Macquarie University presented her research on developing one-step, low-cost multi-metallic catalysts for water electrolysis, including NiFeCo, NiNx, NiMoC, and bifunctional NiFe(OH)x/graphene systems. These catalysts exhibit high catalytic activity and stability, showing promise for scale-up to 10 cm × 10 cm electrodes. Solar-powered electrolysis was emphasized as a viable pathway for large-scale green hydrogen production, compared to traditional methods. Integration of catalysts with advanced silicon photoelectrodes, including tandem perovskite/silicon photoelectrodes, aims to improve solar-to-hydrogen efficiencies. The interdisciplinary approach combines catalyst optimization, photovoltaic integration, and techno-economic analysis to advance sustainable hydrogen production from different water sources. Dr. Zhang's research also explores coupling electrolytic hydrogen production with biowaste upgrading to further enhance cost-effectiveness and sustainability. The talk discussed recent progress, remaining challenges, and pathways to translate high-performance catalytic materials into scalable, integrated systems aligned with global carbon neutrality goals.