Cited by 353Electrocatalysts for Energy ConversionCO2 Reduction Techniques and CatalystsAdvanced Photocatalysis Techniques

Super-Hydrophilic Hierarchical Ni-Foam-Graphene-Carbon Nanotubes-Ni 2 P–CuP 2 Nano-Architecture as Efficient Electrocatalyst for Overall Water Splitting

Riyajuddin, Sk, Azmi, Kashif, Pahuja, Mansi, Kumar, Sushil, Maruyama, Takahiro, Bera, Chandan, Ghosh, Kaushik·2021·ACS Nano

Abstract

Water splitting via an electrochemical process to generate hydrogen is an economic and green approach to resolve the looming energy and environmental crisis. The rational design of multicomponent materials with seamless interfaces having robust stability, facile scalability, and low-cost electrocatalysts is a grand challenge to produce hydrogen by water electrolysis. Herein, we report a superhydrophilic homogeneous bimetallic phosphide of Ni 2 P–CuP 2 on Ni-foam-graphene-carbon nanotubes (CNTs) heterostructure using facile electrochemical metallization followed by phosphorization without any intervention of metal-oxides/hydroxides. This bimetallic phosphide shows ultralow overpotentials of 12 (HER, hydrogen evolution reaction) and 140 mV (OER, oxygen evolution reaction) at current densities of 10 and 20 mA/cm 2 in acidic and alkaline mediums, respectively. The excellent stability lasts for at least for 10 days at a high current density of 500 mA/cm 2 without much deviation, inferring the practical utilization of the catalyst toward green fuel production. Undoubtedly, the catalyst is capable enough for overall water splitting at a very low cell voltage of 1.45 V @10 mA/cm 2 with an impressive stability of at least 40 h, showing a minimum loss of potential. Theoretical study has been performed to understand the reaction kinetics and d-band shifting among metal atoms in the heterostructure (Ni 2 P–CuP 2 ) that favor the HER and OER activities, respectively. In addition, the catalyst demonstrates an alternate transformation of solar energy to green H 2 production using a standard silicon solar cell. This work unveils a smart design and synthesizes a highly stable electrocatalyst against an attractive paradigm of commercial water electrolysis for renewable electrochemical energy conversion.

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Crossref · 10.1021/acsnano.1c00647

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70 of 70 references verified0 citation errors · 0 not checkable

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  • In situ formed micro-sphere graphene-CNTs-Ni2P-CuP2 catalyst on Ni foam endows the electrode with superhydrophilicity and superaerophobicity, allowing bubbles to detach quickly and re-expose active sites, achieving excellent HER performance.

    “The in situ formed micro-sphere graphene-CNTs–Ni2P–CuP2 catalyst on Ni foam endows the electrode with superhydrophilicity and superaerophobicity (Fig. 10d), allowing the bubbles to detach quickly and re-expose the active sites, thus achieving excellent HER performance.”
  • Reported HER catalysts often suffer from substantial energy overhead including that used for iR compensation and/or severe performance decay at long times at current density higher than 500 mA cm−2.

    “the reported HER catalysts often suffer from substantial energy overhead including that used for iR compensation and/or severe performance decay at long times at current density higher than 500 mA cm−2.”

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Authors
Riyajuddin, S., Azmi, K., Pahuja, M., Kumar, S., Maruyama, T., Bera, C., & Ghosh, K.
Affiliations
  • Institute of Nano Science & Technology, Knowledge City, Sector-81, SAS Nagar, Manauli PO 140306, Punjab, India
  • Meijo University (JP)
Corresponding author
Ghosh, Kaushik
Venue
ACS Nano
Published
2021-02-24
Volume
15
Issue
3
Pages
5586-5599
ISSN
  • 1936-0851 (ISSN-L)
  • 1936-086X
OpenAlex
W3132580410
Cited by
353
References
70
Citations by year
2026: 44 · 2025: 50 · 2024: 58 · 2023: 69 · 2022: 104 · 2021: 28
FWCI
12.14
Type
journal article
Language
en
Open access
closed
Locations
  • ACS Nano (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Science and Engineering Research Board (SERB-EEQ/2016/000499)
  • Department of Science and Technology, India (Nanomission-SR-/NM/NS-91/2016)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › CO2 Reduction Techniques and Catalysts
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Advanced Photocatalysis Techniques
Keywords
overall water splitting, electrocatalysts, hydrogen evolution reaction, oxygen evolution reaction, nickel foam, graphene, carbon nanotubes, hierarchical heterostructure, electrochemical metallization, phosphorization, electrochemical hydrogen production, solar hydrogen production, d-band theory, reaction kinetics

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