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Abstract <p>NiO<sub>aq</sub> and NiO<sub>et</sub> nanoparticles (NPs) were produced by treating nickel chloride hexahydrate with aqueous and ethanolic extracts, respectively of <i>Mangifera indica</i> (mango) leaves. Two binary metal nanocomposites (NCs) i.e., (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et1</sub> and (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et2</sub> were also synthesized by calcining NiO<sub>et</sub> with Mn(NO<sub>3</sub>)<sub>2</sub> at 400 and 800 ℃, respectively. The synthesized nanostructures were characterized by XRD, FTIR, SEM, UV-Visible and TGA/DSC analyses. The average crystallite sizes were found to be 13.86 and 13.82&#xa0;nm for NiO<sub>aq</sub> and NiO<sub>et</sub> NPs, respectively. The (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et1</sub> and (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et2</sub> showed cubic structures with crystallite sizes of 31.62 and 31.10&#xa0;nm, respectively. FTIR spectroscopy showed the Ni-O and Mn-O vibrations and coatings of organic moieties upon the surfaces of NPs. The UV-Visible absorption peaks in NiO<sub>aq</sub> and NiO<sub>et</sub> at 276 and 271&#xa0;nm, respectively, were shifted to 278.2 and 296.6&#xa0;nm in (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et1</sub> and (NiMn<sub>2</sub>O<sub>4</sub>) <sub>et2</sub>, respectively. SEM morphologies of NiO<sub>aq</sub> and NiO<sub>et</sub> were changed into layered and more uniform nanosheets in the binary nanocomposites i.e., (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et1</sub> and (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et2</sub>. The average particle sizes of NiO<sub>aq</sub>, NiO<sub>et</sub>, (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et1</sub> and (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et2</sub> were found to be 27.88, 24.09, 20.46 and 31.19&#xa0;mm, respectively. TGA/DSC analysis of NiO<sub>aq</sub>, NiO<sub>et</sub>, (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et1</sub> and (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et2</sub> has shown a total weight loss of 23.36, 57.3, 49.71 and 70.46%, respectively and the enthalpies of 3569.5, 9267.0, 6250.8 and 9584.5&#xa0;J/g, respectively. The synthesized NPs serve as highly efficient electrocatalysts for water splitting as shown by the results of cyclic voltammetry (CV) and linear sweep voltammetry (LSV) curves of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The best electrocatalytic water splitting potential was shown by (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et2</sub> with the highest ECSA (C<sub>dl</sub> value = 17 mFcm<sup>− 2</sup>) and the lowest Tafel slope values of 170 mV dec<sup>−1</sup> and 131 for HER and OER, respectively.</p> Graphic Abstract <p></p> Highlights <p><UnorderedList Mark="Bullet"> <ItemContent> <p>We biosynthesized NiO<sub>aq</sub> and NiO<sub>et</sub> nanoparticles by using aqueous and ethanolic extracts, respectively of Mangifera indica (mango) leaves.</p> </ItemContent> <ItemContent> <p>(NiMn<sub>2</sub>O<sub>4</sub>)<sub>et1</sub> and (NiMn<sub>2</sub>O<sub>4</sub>)<sub>et2</sub> were synthesized by calcining NiO<sub>et</sub> with Mn(NO<sub>3</sub>)<sub>2</sub> at 400 and 800 ℃, respectively.</p> </ItemContent> <ItemContent> <p>The products were characterized by XRD, FTIR, SEM, UV-Visible and TGA/DSC analyses.</p> </ItemContent> <ItemContent> <p>The synthesized NPs are efficient and effective electrocatalysts for water splitting systems as shown by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) curves for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).</p> </ItemContent> <ItemContent> <p>(NiMn<sub>2</sub>O<sub>4</sub>)<sub>et2</sub> exhibited the superior electrocatalytic water splitting potential with the highest ECSA (C<sub>dl</sub> value = 17 mFcm<sup>-2</sup>) and the lowest Tafel slope values of 170 mV dec<sup>−1</sup> and 131 for HER and OER, respectively.</p> </ItemContent> </UnorderedList></p>

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Green Synthesis of Mangifera Indica Mediated NiO and NiMn2O4 Nanomaterials for Electrocatalytic Water Splitting

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Fatima Masood,
  • Shabbir Hussain,
  • Muhammad Arif,
  • Shahzad Murtaza,
  • Muhammad Imran,
  • Muhammad Bilal Tahir,
  • Khurram Shahzad Munawar,
  • Hamad M. Alkahtani,
  • Amer Alhaj Zen,
  • Syed Adnan Ali Shah

摘要

Abstract

NiOaq and NiOet nanoparticles (NPs) were produced by treating nickel chloride hexahydrate with aqueous and ethanolic extracts, respectively of Mangifera indica (mango) leaves. Two binary metal nanocomposites (NCs) i.e., (NiMn2O4)et1 and (NiMn2O4)et2 were also synthesized by calcining NiOet with Mn(NO3)2 at 400 and 800 ℃, respectively. The synthesized nanostructures were characterized by XRD, FTIR, SEM, UV-Visible and TGA/DSC analyses. The average crystallite sizes were found to be 13.86 and 13.82 nm for NiOaq and NiOet NPs, respectively. The (NiMn2O4)et1 and (NiMn2O4)et2 showed cubic structures with crystallite sizes of 31.62 and 31.10 nm, respectively. FTIR spectroscopy showed the Ni-O and Mn-O vibrations and coatings of organic moieties upon the surfaces of NPs. The UV-Visible absorption peaks in NiOaq and NiOet at 276 and 271 nm, respectively, were shifted to 278.2 and 296.6 nm in (NiMn2O4)et1 and (NiMn2O4) et2, respectively. SEM morphologies of NiOaq and NiOet were changed into layered and more uniform nanosheets in the binary nanocomposites i.e., (NiMn2O4)et1 and (NiMn2O4)et2. The average particle sizes of NiOaq, NiOet, (NiMn2O4)et1 and (NiMn2O4)et2 were found to be 27.88, 24.09, 20.46 and 31.19 mm, respectively. TGA/DSC analysis of NiOaq, NiOet, (NiMn2O4)et1 and (NiMn2O4)et2 has shown a total weight loss of 23.36, 57.3, 49.71 and 70.46%, respectively and the enthalpies of 3569.5, 9267.0, 6250.8 and 9584.5 J/g, respectively. The synthesized NPs serve as highly efficient electrocatalysts for water splitting as shown by the results of cyclic voltammetry (CV) and linear sweep voltammetry (LSV) curves of oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The best electrocatalytic water splitting potential was shown by (NiMn2O4)et2 with the highest ECSA (Cdl value = 17 mFcm− 2) and the lowest Tafel slope values of 170 mV dec−1 and 131 for HER and OER, respectively.

Graphic Abstract

Highlights

We biosynthesized NiOaq and NiOet nanoparticles by using aqueous and ethanolic extracts, respectively of Mangifera indica (mango) leaves.

(NiMn2O4)et1 and (NiMn2O4)et2 were synthesized by calcining NiOet with Mn(NO3)2 at 400 and 800 ℃, respectively.

The products were characterized by XRD, FTIR, SEM, UV-Visible and TGA/DSC analyses.

The synthesized NPs are efficient and effective electrocatalysts for water splitting systems as shown by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) curves for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER).

(NiMn2O4)et2 exhibited the superior electrocatalytic water splitting potential with the highest ECSA (Cdl value = 17 mFcm-2) and the lowest Tafel slope values of 170 mV dec−1 and 131 for HER and OER, respectively.