Sarkar Subhajit, Biswas Ashmita, Siddharthan Erakulan E, Thapa Ranjit, Dey Ramendra Sundar
Institute of Nano Science and Technology (INST), Sector-81, Mohali-140306, Punjab, India.
Department of Physics, SRM University, Andhra Pradesh 522240, India.
ACS Nano. 2022 May 24;16(5):7890-7903. doi: 10.1021/acsnano.2c00547. Epub 2022 Apr 18.
An effective modulation of the active sites in a bifunctional electrocatalyst is essentially desired, and it is a challenge to outperform the state-of-the-art catalysts toward oxygen electrocatalysis. Herein, we report the development of a bifunctional electrocatalyst having target-specific Fe-N/C and Co-N/C isolated active sites, exhibiting a symbiotic effect on overall oxygen electrocatalysis performances. The dualism of N-dopants and binary metals lower the d-band centers of both Fe and Co in the Fe,Co,N-C catalyst, improving the overpotential of the overall electrocatalytic processes (Δ = 0.74 ± 0.02 V vs RHE). Finally, the Fe,Co,N-C showed a high areal power density of 198.4 mW cm and 158 mW cm in the respective liquid and solid-state Zn-air batteries (ZABs), demonstrating suitable candidature of the active material as air cathode material in ZABs.
对双功能电催化剂中的活性位点进行有效调控是十分必要的，而要在氧电催化方面超越现有最先进的催化剂则是一项挑战。在此，我们报道了一种具有目标特异性的Fe-N/C和Co-N/C孤立活性位点的双功能电催化剂的研发，该催化剂在整体氧电催化性能上表现出共生效应。N掺杂剂和二元金属的二元性降低了Fe,Co,N-C催化剂中Fe和Co的d带中心，改善了整个电催化过程的过电位（相对于可逆氢电极，Δ = 0.74 ± 0.02 V）。最后，Fe,Co,N-C在相应的液态和固态锌空气电池（ZABs）中分别显示出198.4 mW cm和158 mW cm的高面积功率密度，证明了该活性材料作为ZABs空气阴极材料的合适候选性。
