能源化学(英文版) ›› 2020, Vol. 49 ›› Issue (10): 189-197.DOI: 10.1016/j.jechem.2020.02.025

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In situ growth of 3D walnut-like nano-architecture Mo-Ni2P@NiFe LDH/NF arrays for synergistically enhanced overall water splitting

Zhi Yanga, Yu Lina, Feixiang Jiaoa, Jinhui Lia, Jinlei Wanga, Yaqiong Gonga,b   

  1. a Chemical Engineering and Technology,North University of China,Taiyuan 030051,Shanxi,China;
    b State Key Laboratory of Physical Chemistry of Solid Surfaces,Xiamen University,Xiamen 361005,Fujian,China
  • 收稿日期:2020-01-04 修回日期:2020-02-04 出版日期:2020-10-15 发布日期:2020-12-18
  • 通讯作者: Yaqiong Gong
  • 基金资助:
    This work is supported financially by the Key Research and Development Program of Shanxi(201803D421085),Shanxi Scholarship Council of China,Shanxi Graduate Education Innovation Project and State key laboratory of physical chemistry of solid surface,Xiamen University(201912).

In situ growth of 3D walnut-like nano-architecture Mo-Ni2P@NiFe LDH/NF arrays for synergistically enhanced overall water splitting

Zhi Yanga, Yu Lina, Feixiang Jiaoa, Jinhui Lia, Jinlei Wanga, Yaqiong Gonga,b   

  1. a Chemical Engineering and Technology,North University of China,Taiyuan 030051,Shanxi,China;
    b State Key Laboratory of Physical Chemistry of Solid Surfaces,Xiamen University,Xiamen 361005,Fujian,China
  • Received:2020-01-04 Revised:2020-02-04 Online:2020-10-15 Published:2020-12-18
  • Contact: Yaqiong Gong
  • Supported by:
    This work is supported financially by the Key Research and Development Program of Shanxi(201803D421085),Shanxi Scholarship Council of China,Shanxi Graduate Education Innovation Project and State key laboratory of physical chemistry of solid surface,Xiamen University(201912).

摘要: The in situ growth of nano-array on material structure is a novel and high-efficient strategy to design catalysts,however,it still remains a challenge to fabricate unique nano-architecture electrocatalyst with prominent activity and superior durability for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).Herein,a unique nano-architecture catalyst is successfully synthesized by using NiFe LDH nanosheets as framework to the in situ growth Mo-doped Ni2P ultrafine nanosheets (marked as Mo-Ni2P@NiFe LDH/NF).The unique 3D core-shell nano-architecture is favorable for enhancing electron transfer/mass diffusion,providing abundant active sites,prompting O2/H2 gas release,and creating the synergistic effect between Mo-Ni2P and NiFe LDH.Therefore,comparing with pure NiFe LDH/NF and Mo-Ni2P/NF electrodes,walnut-like Mo-Ni2P@NiFe LDH/NF catalyst exhibits significantly improved electrocatalytic activities and durability towards OER (269 mV@40 mA cm-2),HER (82 mV@10 mA cm-2),and overall water splitting (1.46 V@10 mA cm-2),respectively.Such electrocatalytic activity of Mo-Ni2P@NiFe LDH/NF is comparable with that of majority reported non-precious metal catalysts and even precious catalysts (IrO2 and Pt/C).This work presents a new perspective strategy to fabricate ingeniously bifunctional electrocatalysts with well-designed structure and superior performance for clean energy conversion technologies or storage devices.

关键词: Nano-architecture, 3D walnut-like, Synergistic effect, In situ growth, Bifunctional catalyst

Abstract: The in situ growth of nano-array on material structure is a novel and high-efficient strategy to design catalysts,however,it still remains a challenge to fabricate unique nano-architecture electrocatalyst with prominent activity and superior durability for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).Herein,a unique nano-architecture catalyst is successfully synthesized by using NiFe LDH nanosheets as framework to the in situ growth Mo-doped Ni2P ultrafine nanosheets (marked as Mo-Ni2P@NiFe LDH/NF).The unique 3D core-shell nano-architecture is favorable for enhancing electron transfer/mass diffusion,providing abundant active sites,prompting O2/H2 gas release,and creating the synergistic effect between Mo-Ni2P and NiFe LDH.Therefore,comparing with pure NiFe LDH/NF and Mo-Ni2P/NF electrodes,walnut-like Mo-Ni2P@NiFe LDH/NF catalyst exhibits significantly improved electrocatalytic activities and durability towards OER (269 mV@40 mA cm-2),HER (82 mV@10 mA cm-2),and overall water splitting (1.46 V@10 mA cm-2),respectively.Such electrocatalytic activity of Mo-Ni2P@NiFe LDH/NF is comparable with that of majority reported non-precious metal catalysts and even precious catalysts (IrO2 and Pt/C).This work presents a new perspective strategy to fabricate ingeniously bifunctional electrocatalysts with well-designed structure and superior performance for clean energy conversion technologies or storage devices.

Key words: Nano-architecture, 3D walnut-like, Synergistic effect, In situ growth, Bifunctional catalyst