Abstract
Green hydrogen produced by water electrolysis in combination with renewable energy is expected to become a key enabler for decarbonization of energy and transportation sectors as well as hard-to-abate industries, contributing to the achievement of carbon neutrality. Compared to the conventional alkaline water electrolysis technology, proton exchange membrane water electrolysis (PEMWE) possesses many advantages for green hydrogen production , but currently relies heavily on the expensive and scarce platinum group metals (PGMs) to catalyze the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), which hinders widespread deployment of the PEMWE technology. This short review article briefly summarizes recent efforts dedicated to developing PGM-free HER and OER catalysts, with a focus on the emerging ones showing promising catalytic performance. Moreover, perspectives of future research on PGM-free catalysts are also outlined.
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