首页|Modulating Fe/P ratios in Fe-P alloy through smelting reduction for long-term electrocatalytic overall water splitting

Modulating Fe/P ratios in Fe-P alloy through smelting reduction for long-term electrocatalytic overall water splitting

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Owing to strong Fe-P interaction that differs the electron distribution beneath metal/phosphide interface of Fe-P alloy,the charge transfer of Fe-P alloy has been accelerated during the electrocatalytic oxidation process and improved the efficiency and durability of overall water splitting.In this work,a novel metal-lurgical technology in combination with smelting reduction and Single Roller Melting Spinning(SRMS)for the purpose of electrochemical overall water splitting where High-phosphorus Oolitic Iron Ore(HPOIO)has been directly used as the main raw material is developed for preparing amorphous Fe-P alloys strips.The rational modulation on the Fe/P ratio can alter the crystal structure and crystallinity of Fe-P alloy,favor electron transfer,and further trap the positively charged H+.The obtained FeP electrocatalyst ex-hibits 436 and 527 mV at 10 mA cm-1 with Tafel slopes of 102.3 and 77.2 mV dec-1 for HER and OER in 1.0 mol/L KOH solution,respectively,especially with long-term stability(～207 h for HER and～42 h for OER).Specifically,the DFT calculation displaying structural advantages and componential superiorities exhibited that P in Fe-P amorphous alloy regulated by systematic P addition optimization might increase the energy density in the Fermi level.Furthermore,the phosphorus content brought about high active surface areas,low impedance,and variable reaction paths-caused low reaction energy barriers with the improved amorphicity and absorption and desorption of intermediates,thereby boosting the overall wa-ter splitting activity.This study displays a novel strategy to develop Fe-P amorphous alloy for the stable and efficient overall water splitting.

High-phosphorus Oolitic Iron OreFe-P alloySmelting reductionElectrocatalysisOverall water splitting

Tian Zhang、Xiaohui Ren、Shuai Mo、Wenzhe Cao、Chaogang Zhou、Feng Ma、Rongsheng Chen、Chao Zeng、Li Shi、Tao Liu、Hua Zhang、Hongwei Ni

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The State Key Laboratory of Refractories and Metallurgy,Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education & Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steel Making,Faculty of Materials,Wuhan University of Science and Technology,Wuhan 430081,China

College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,China

School of Chemical Engineering and Technology,Wuhan University of Science and Technology,Wuhan 430081,China

Institute of Advanced Materials,Jiangxi Normal University,Nanchang 330022,China

School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China

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2024

10.1016/j.jmst.2024.02.037

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.199(32)