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At present, the preparation of highly active, long-term durable, and low cost electrocatalysts toward oxygen evolution reaction is still a challenge for energy conversion and storage. This work reports CoS 1.097 embedded in flower-like biomass derived from red blood cells (RBCs) nanocatalyst, was synthesized via a one-step, hydrothermal method. Compared to pure CoS 1.097 microspheres, the generated flower-like CoS 1.097 -biomass (CoS 1.097 -B) nanosheets exhibits enhanced OER electrocatalytic activity with a onset potential of 1.43 V (vs. RHE), an overpotential of 260 mV at the current density of 10 mA cm−2, and a low Tafel slope of 83 mV dec−1. Moreover, the CoS 1.097 -B displays good OER stability with little decrease after 400 cycles. Our work provides a reference for designing catalysts with high activity and good stability using biomass under mild conditions. Image 1 • Novel synthesis of CoS 1.097 embedded in flower-like biomass nanocatalysts. • More exposed CoS 1.097 particles impart large active area. • The CoS 1.097 -B exhibits excellent activity and stability towards OER. • The CoS 1.097 -B requires an overpotential of 260 mV to reach a current density of 10 mA cm−2. • The Tafel slope of CoS 1.097 -B is only 83 mV dec−1. [ABSTRACT FROM AUTHOR]