Nickel Phthalocyanine Modified Fruit -Peel -Derived Carbon Framework Selectively Electro-Catalyzes Co2-to-Co Conversion

Abstract

Developing a robust catalyst for CO 2 reduction reaction (CO 2 RR) is key to closing the carbon cycle and achieving energy sustainability. Yet, the CO 2 RR still faces major challenges, partly due to the lack of highly active, selective, and stable electrocatalysts. Herein, we reported an effective strategy to immobilize nickel phthalocyanine ( Ni-Pc) molecules on the fruit -peel-derived carbon framework surface (denoted as Ni-Pc/CF and carbon framework denoted as CF) with exceptional CO production performances. Dispersed Ni-Pc molecules on the carbon materials are verified by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman, and X-ray photoelectron spectroscopy (XPS) measurements. The as-prepared Ni-Pc/CF catalyst delivers the high faradaic efficiency (FE) of > 95.0% over a potential of -0.7 to -0.9 V ( vs reversible hydrogen electrode (RHE), V RHE ), the maximum FE (99.1%) can close to 100 % at -0.8 V, as well as the excellent durability over a 10 h reaction period. This work offers valuable insights into the immobilization of stabilized, high dispersed molecule catalysts on carbon materials surfaces for electrocatalytic and selective reduction of CO 2 .

Keywords: Keywords: CO2 reduction, Electrocatalysis, Nickel phthalocyanine, Fruit-peel, carbon materials