Nowadays, mainstream research on graphene trends towards employing environmentally friendly or green synthesis routes and precursors, and ensuing green graphene nanomaterials are shown to be highly beneficial for a range of scientific applications, from energy/electronics to engineering to biomedical arenas. Specifically, graphene has emerged as a leading contender for designing green or ecological energy conversion (solar cells, fuel cells) and energy storage (supercapacitors, batteries) devices/systems. In this perspective article, we basically aim to highlight state-of-the-art advancements of green-sourced graphene and related nanomaterials in today’s energy sectors. According to scientific endeavors so far on green graphene, its successful design, real-world energy conversion/storage device application, and commercialization depend upon resolving underlying challenges of synthesis/performance. We observe notable applications of green graphene in the fields of photovoltaics, fuel cells, capacitors, and batteries. Herein, we suggest comprehensive future surveys for advanced fabrication techniques and sustainable sources/techniques to develop next-generation green graphene-derived energy systems with superior energy storage capacities and power outputs.
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