Title of Paper:Porous TiN-based ceramic electrode with N-modified Co-based Nanorods/ TiN heterointerfaces for efficient overall water splitting

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Affiliation of Author(s):[1]Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, Hefei 230026, Anhui, Peoples R China;[2]Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Anhui, Peoples R China;[3]Univ Elect Sci & Technol China, Sch Energy Sci & Engn, 2006 Xiyuan Rd, Chengdu 611731, Sichuan, Peoples R China;[4]Univ Sci & Technol China, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230026, Anhui, Peoples R China;[5]Hefei Univ, Sch Energy Mat & Chem Engn, Hefei 230601, Anhui, Peoples R China;[6]Univ Ioannina, Dept Mat Sci & Engn, GR-45110 Ioannina, Greece

Journal:JOURNAL OF POWER SOURCES

Key Words:Overall water splitting; Heterointerface; Ceramic electrode; Porous ceramic membrane; Nanorod catalyst

Abstract:The development of high-performance electrocatalytic electrodes for overall water splitting is a crucial issue to realize renewable hydrogen production. This paper presents the in situ growth of N-modified Co-based nanorods on porous TiN ceramic membranes using the hydrothermal method and thermal NH3 3 treatment, resulting in a novel self-supported electrocatalytic electrode with abundant heterointerfaces, denoted as NCTN-x-y (x: nitridation temperature; y: nitridation time). In the alkaline medium (1 M KOH), the NCTN-350-2 electrode displays the best hydrogen evolution reaction (HER) activity (r10 10 = 66 mV), and the NCTN-250-3 electrode manifests the best oxygen evolution reaction (OER) performance (r10 10 = 270 mV). Accordingly, these two electrodes comprise an electrolyzer, which features a current density of 10 mA cm-- 2 at a low cell voltage of 1.63 V. The good electrocatalytic performance can be attributed to the abundant heterointerfaces formed between the porous TiN ceramic membrane and the N-modified Co-based nanorods, in conjunction with the hierarchical pore structure of the TiN ceramic membrane. Theoretical calculations identify that the construction of heterointerfaces modulates the electronic structure of active sites, thereby promoting the dissociation of H2O, 2 O, optimizing the H* adsorption energy (Delta GH*), Delta G H* ), and accelerating the reaction kinetics, which ultimately improve the electrocatalytic activity of electrode.

Document Type:Article

Volume:610

ISSN No.:0378-7753

Translation or Not:no