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Hollow Nanocages of Ni_xCo_1-xSe for Efficient Zinc-Air Batteries and Overall Water Splitting.

ABSTRACT: Developing Earth-abundant, highly efficient, and anti-corrosion electrocatalysts to boost the oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and hydrogen evolution reaction (HER) for the Zn-air battery (ZAB) and for overall water splitting is imperative. In this study, a novel process starting with Cu₂O cubes was developed to fabricate hollow Ni_xCo_1-xSe nanocages as trifunctional electrocatalysts for the OER, ORR, and HER and a reasonable formation mechanism was proposed. The Ni_0.2Co_0.8Se nanocages exhibited higher OER activity than its counterparts with the low overpotential of 280 mV at 10 mA cm^-2. It also outperformed the other samples in the HER test with a low overpotential of 73 mV at 10 mA cm^-2. As an air-cathode of a self-assembled rechargeable ZAB, it exhibited good performance, such as an ultralong cycling lifetime of > 50 h, a high round-trip efficiency of 60.86%, and a high power density of 223.5 mW cm^-2. For the application in self-made all-solid-state ZAB, it also demonstrated excellent performance with a power density of 41.03 mW cm^-2 and an open-circuit voltage of 1.428 V. In addition, Ni_0.2Co_0.8Se nanocages had superior performance in a practical overall water splitting, in which only 1.592 V was needed to achieve a current density of 10 mA cm^-2. These results show that hollow Ni_xCo_1-xSe nanocages with an optimized Ni-to-Co ratio are a promising cost-effective and high-efficiency electrocatalyst for ZABs and overall water splitting in alkaline solutions.

SUBMITTER: Qian Z

PROVIDER: S-EPMC7770759 | biostudies-literature |

REPOSITORIES: biostudies-literature

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