Hierarchical FeCo LDH/NiSe heterostructure electrocatalysts with rich heterointerfaces for robust water splitting at industrial-level current density

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR Inorganic Chemistry Frontiers Pub Date : 2024-11-06 DOI:10.1039/d4qi02426e
Weiwei Han, Wenyi Wang, Jiahong Liao, Yi He, Xingwang Zhang, Chunlin Yu
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Abstract

Sustainable hydrogen production by electrocatalytic water splitting is a promising energy storage technology yet challenging due to the sluggish kinetics of the oxygen evolution reaction (OER). Rationally designed robust and high-efficiency non-noble metal electrocatalysts for large-current-density OER is highly desirable for industrial-grade hydrogen production. Herein, a unique hiereachical heterostructure electrocatalyst composed of FeCo layered double hydroxides nanosheets and NiSe nanowires array grown on Ni foam (FeCo LDH/NiSe@NF) is demonstrated. The optimized FeCo LDH/NiSe@NF exhibits an excellent OER activity with low overpotentials of 230, 266 and 298 mV at current densities of 100, 500 and 1000 mA cm-2 in an alkaline solution. Especially, it can deliver 1000 mA cm-2 without much decay after the long-term stability test for 100 h. Both the experimental results and theoretical calculations reveal that reasonable construction of hiereachical heterostructure, as well as the strong interaction at the heterointerface between NiSe and FeCo LDH not only can offer sufficient exposure of the surface active sites, better electrochemical conductivity and structural stability, but also effectively optimize electronic configurations, lower the reaction energy barriers, consequently facilitating the reaction kinetics especially in large-current-density alkaline water electrolysis. Moreover, a two-electrode electrolyzer using FeCo LDH/NiSe@NF and NiCoP/NiCoSx@NF as anode and cathode only needs a cell voltage of 1.849 V to reach 1000 mA cm-2 in 30wt% KOH solution at 80 °C. The high catalytic activity and long-term stability of the catalyst at large current densities have exceeded most electrocatalysts reported, highlighting its great potential in large-scale applications.
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具有丰富异质界面的分层铁钴 LDH/NiSe 异质结构电催化剂,可在工业级电流密度下实现稳健的水分离功能
通过电催化水分裂实现可持续制氢是一项前景广阔的储能技术,但由于氧进化反应(OER)的动力学缓慢,这项技术具有挑战性。合理设计用于大电流密度氧进化反应的坚固高效非贵金属电催化剂是工业级制氢的理想选择。本文展示了一种由生长在镍泡沫上的铁钴层状双氢氧化物纳米片和镍硒纳米线阵列(FeCo LDH/NiSe@NF)组成的独特的 "hiereachical "异质结构电催化剂。优化后的 FeCo LDH/NiSe@NF 在碱性溶液中的电流密度分别为 100、500 和 1000 mA cm-2 时,具有 230、266 和 298 mV 的低过电位,表现出卓越的 OER 活性。实验结果和理论计算均表明,合理地构建异质结构,以及 NiSe 和 FeCo LDH 在异质界面上的强相互作用,不仅能提供充分的表面活性位点暴露、更好的电化学传导性和结构稳定性,还能有效优化电子构型、降低反应能垒,从而促进反应动力学,尤其是在大电流密度碱性水电解中。此外,以 FeCo LDH/NiSe@NF 和 NiCoP/NiCoSx@NF 作为阳极和阴极的双电极电解槽在 80 °C 的 30wt% KOH 溶液中只需 1.849 V 的电池电压就能达到 1000 mA cm-2。该催化剂在大电流密度下的高催化活性和长期稳定性超过了大多数已报道的电催化剂,凸显了其在大规模应用中的巨大潜力。
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来源期刊
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
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