Details

Autor(en) / Beteiligte

• Zeng, ChuiTao
• Zhou, KaiLing
• Jin, YuHong
• Zhang, QianQian
• Liu, JingBing
• Wang, Hao

Titel

A binder- and carbon-free hydrogen evolution electro-catalyst in alkaline media based on nitrogen-doped Ni(OH)2 nanobelts/3D Ni foam

Ist Teil von

• Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology, 2020, Vol.22 (8)

Ort / Verlag

Dordrecht: Springer Netherlands

Erscheinungsjahr

2020

Quelle

2022 ECC(Springer)

Beschreibungen/Notizen

• 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 (C dl ) 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/selenides for the improved electrocatalytic hydrogen evolution performance. We firstly proposed a facile two-step preparation route to fabricate the nitrogen-doped Ni(OH) 2 nanobelts that have been decorated on nickel foam (N-Ni(OH) 2 /NF). Benefiting from the doping effect of nitrogen atom into Ni(OH) 2 crystalline, the N-Ni(OH) 2 /NF electrode delivers the very low-onset overpotential along with superior electro-catalytic durability and stability. More importantly, this strategy can be developed to modify the other metal hydroxides, metal phosphides, and metal selenide for the increased HER performance.