Highly Reversible Water Splitting Cell Building from Hierarchical 3D Nickel Manganese Oxyphosphide Nanosheets

Publication date: Available online 26 December 2019Source: Nano EnergyAuthor(s): Jayaraman Balamurugan, Thanh Tuan Nguyen, Vanchiappan Aravindan, Nam Hoon Kim, Joong Hee LeeAbstractWhile it is essential to progress highly reversible water splitting cells with hierarchical nanostructures for overall water splitting, meeting large-scale industrial applications remains a key challenge. Herein, for the first time, a new strategy is established to fabricate hierarchical 3D nickel manganese oxyphosphide nanosheets (NiMnOP NSs) with high electroactive sites, numerous nanoporous networks, and plentiful oxygen vacancies for highly reversible water splitting application. When serving as the catalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), the hierarchical 3D NiMnOP catalyst entails the low overpotentials of about 195 and 290 mV, respectively, at a current density of 500 mA cm−2 with long-term durability. Impressively, HER and OER performances of NiMnOP catalyst are highly reversible because of their interconversion characteristics of both catalytic active sites. The assembled NiMnOP||NiMnOP water splitting cell delivers a current density of 10 and 500 mA cm−2 at cell voltages of 1.51 and 1.72 V, respectively, which is superior to state-of-art Pt-C||RuO2 (∼1.53 V at a current density of 10 mA cm−2). Most importantly, the water splitting cell reveals excellent reversibility of both half-reactions in water splitting process at a hig...
Source: Nano Energy - Category: Nanotechnology Source Type: research

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