AUTHOR=Xiao Yifan , Deng Sihui , Li Meng , Zhou Qixing , Xu Libang , Zhang Huaifang , Sun Dongmei , Tang Yawen 

TITLE=Immobilization of Fe-Doped Ni2P Particles Within Biomass Agarose-Derived Porous N,P-Carbon Nanosheets for Efficient Bifunctional Oxygen Electrocatalysis

JOURNAL=Frontiers in Chemistry

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00523

DOI=10.3389/fchem.2019.00523

ISSN=2296-2646

ABSTRACT=<p>A feasible and green sol-gel method is proposed to fabricate well-distributed nano-particulate Fe-Ni<sub>2</sub>P incorporated in N, P-codoped porous carbon nanosheets (Fe-Ni<sub>2</sub>P@N,P-CNSs) using biomass agarose as a carbon source, and ethylenediamine tetra (methylenephosphonic acid) (EDTMPA) as both the N and P source. The doped Fe in Ni<sub>2</sub>P is essential for a substantial increase in intrinsic catalytic activity, while the combined N,P-containing porous carbon matrix with a better degree of graphitization endows the prepared Fe-Ni<sub>2</sub>P@N,P-CNSs catalyst with a high specific surface area and improved electrical conductivity. Benefiting from the specific chemical composition and designed active site structure, the as-synthesized Fe-Ni<sub>2</sub>P@N,P-CNSs manifests a satisfying catalytic performance toward both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in an alkaline solution, with low overpotential, small Tafel slope and long-term durability, relative to the counterparts (Fe-free Ni<sub>12</sub>P<sub>5</sub>/Ni<sub>2</sub>P<sub>2</sub>O<sub>7</sub>@N,P-CNSs and CNSs) with single components and even comparable to Pt/C and RuO<sub>2</sub> catalysts. The present work broadens the exploration of efficient bifunctional oxygen electrocatalysts using earth abundant biomass as carbon sources based on non-noble metals for low cost renewable energy conversion/storage.</p>