A binder- and carbon-free hydrogen evolution electro-catalyst in alkaline media based on nitrogen-doped Ni(OH) 2 nanobel
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RESEARCH PAPER
A binder- and carbon-free hydrogen evolution electro-catalyst in alkaline media based on nitrogen-doped Ni(OH)2 nanobelts/3D Ni foam ChuiTao Zeng & KaiLing Zhou & YuHong Jin QianQian Zhang & JingBing Liu & Hao Wang
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Received: 19 May 2020 / Accepted: 6 August 2020 / Published online: 13 August 2020 # Springer Nature B.V. 2020
Abstract Designing a simple method to prepare a binder- and carbon-free catalyst with a highly efficient and stable hydrogen evolution electro-catalytic performance in the alkaline media is necessary and urgent. Herein, we develop a low-temperature hydrothermal nitridation and crystal transformation process for the preparation of nitrogen-doped Ni(OH)2 nanobelts decorated on 3D Ni foam (N-Ni(OH)2/NF), where the precursor of amorphous Ni(OH)2/3D Ni foam is fabricated by a simple electrodeposition process. The hydrogen evolution process of our N-Ni(OH)2/NF electrode is studied by using a classical three-electrode electrochemical measurement in the alkaline media. The as-prepared N-Ni(OH) 2 /NF electrode exhibits a small onset overpotential of 178 mV at 100 mA·cm−2 along with the superior electro-catalytic durability and stability after 10,000 cycles and 24-h continuous operation. The good electrocatalytic hydrogen evolution performance of the N-Ni(OH)2/NF electrode may be attributed to the absence of inactive materials (conducting carbon and binder), the high electrochemical active sites with a double-layer capacitance (Cdl) of 9.33 mF·cm−2, the doping effect of nitrogen atom into Ni(OH)2 crystalline, and the crystal transformation of Ni(OH)2. More importantly, this strategy may be used to modify other transition metal oxides/hydroxides/sulfides/phosphides/ C. Zeng : K. Zhou : Y. Jin (*) : Q. Zhang : J. Liu : H. Wang (*) The College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China e-mail: [email protected] e-mail: [email protected]
selenides for the improved electrocatalytic hydrogen evolution performance.
Keywords Ni(OH)2 . Nitrogen doped . Electro-catalyst . Alkaline hydrogen evolution reaction . Water splitting . Nanostructured catalyst
Introduction Nowadays, the limited reserves of fossil resources are facing depletion. It is very urgent to find new energy sources as alternatives to solve the shortage of resources (Hanif et al. 2019; Jiang et al. 2016; Rosato et al. 2019; Demirbas 2005; Luo et al. 2020; Du et al. 2020). However, there are some limitations in the development and utilization of some new energy sources. The exploitation of solar energy needs sunny daylight, but the night times, rainy days, and cloudy days are unavailable and inefficient. When it comes to windy energy, a strict windy geographical environment is required (Chu and Majumdar 2012; Schloegl 2008). Hydrogen is considered as a renewable fuel with advantages of high-energy density and zero carbon dioxide emission to substitute for the traditional fossil fuels in the future (Li et al. 2019a; Tang et al. 2015; Das et al. 2018; Zhang et al. 2017a; Jing et
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