Issue 25, 2024

Cr-dopant induced crystal orientation and shape modulation in Ni2P nanocrystals for improving electrosynthesis of methanol to formate coupled with hydrogen production

Abstract

Simultaneously improving the electrochemical methanol oxidation reaction (MOR) and hydrogen evolution reaction (HER) using the electrolysis technique is a significant yet challenging task. To tackle this, we report a colloidal synthesis of Cr-dopant induced crystal orientation and shape modulation in Ni2P nanocrystals (NCs) as an advanced bifunctional electrocatalyst for electrosynthesis of value-added formate from the MOR at the anode and hydrogen at the cathode. We demonstrate that a two-electrode overall methanol splitting (OMeS) system using Cr-doped Ni2P nanorods (NRs) as a bifunctional catalyst can achieve a lowest voltage of 1.16 V to reach a current density of 10 mA cm−2, compared to the cell voltage of 1.65 V for overall water splitting. Combined experimental and theoretical investigations revealed that the Cr-dopant induces shape modulation and crystal orientation in Ni2P, which favors the thermodynamics of the dehydrogenation process in the MOR and hydrogen adsorption in the HER, leading to enhanced electrocatalytic activities. Interestingly, a proof-of-concept solar-driven system fabricated using a commercial Si photovoltaic cell integrated with an OMeS cell employing bifunctional Cr-doped Ni2P NRs generated a stable photocurrent density of ∼12.3 mA cm−2 for 60 min., demonstrating its promise for energy-efficient and selective electrosynthesis, enabling the production of valuable chemicals and clean hydrogen in a sustainable manner.

Graphical abstract: Cr-dopant induced crystal orientation and shape modulation in Ni2P nanocrystals for improving electrosynthesis of methanol to formate coupled with hydrogen production

Supplementary files

Article information

Article type
Paper
Submitted
20 feb 2024
Accepted
28 mar 2024
First published
01 apr 2024

J. Mater. Chem. A, 2024,12, 15127-15136

Cr-dopant induced crystal orientation and shape modulation in Ni2P nanocrystals for improving electrosynthesis of methanol to formate coupled with hydrogen production

U. P. Suryawanshi, U. V. Ghorpade, J. A. Yuwono, P. V. Kumar, M. A. Gaikwad, S. W. Shin, J. S. Jang, H. R. Jung, M. P. Suryawanshi and J. H. Kim, J. Mater. Chem. A, 2024, 12, 15127 DOI: 10.1039/D4TA01147C

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