TY - JOUR
T1 - Self-supporting NiCo2O4 nanoneedle arrays on atomic-layer-deposited CoO nanofilms on nickel foam for efficient and stable hydrogen evolution reaction
AU - Pang, Ning
AU - Tong, Xin
AU - Deng, Yanping
AU - Xiong, Dayuan
AU - Xu, Shaohui
AU - Wang, Lianwei
AU - Chu, Paul K.
PY - 2023/3
Y1 - 2023/3
N2 - Owing to easy recycling and the pollution-free nature of hydrogen fuel, electrochemical hydrogen production is attracting increasing attention. In this work, 3D NiCo2O4 nanoneedle arrays are prepared on porous nickel foam (NF) coated with a cobalt oxide nanofilm (CNF) produced by atomic layer deposition (ALD) to form a stable and robust catalyst for the hydrogen evolution reaction (HER). As a result, the optimized NiCo2O4@C12NF electrode exhibits excellent catalytic activity with a low overpotential of 96 mV versus RHE at a current density of 10 mA cm−2, small Tafel slope of 50.6 mV dec−1, and outstanding stability for over 25 h in 1 M KOH. The excellent characteristics stem from synergistic effects of the unique nanoneedle arrays, abundant active sites, and short channels at the electrode–electrolyte interface. ALD is demonstrated to be a desirable technique to produce highly efficient HER electrocatalysts for commercial water electrolysis.
AB - Owing to easy recycling and the pollution-free nature of hydrogen fuel, electrochemical hydrogen production is attracting increasing attention. In this work, 3D NiCo2O4 nanoneedle arrays are prepared on porous nickel foam (NF) coated with a cobalt oxide nanofilm (CNF) produced by atomic layer deposition (ALD) to form a stable and robust catalyst for the hydrogen evolution reaction (HER). As a result, the optimized NiCo2O4@C12NF electrode exhibits excellent catalytic activity with a low overpotential of 96 mV versus RHE at a current density of 10 mA cm−2, small Tafel slope of 50.6 mV dec−1, and outstanding stability for over 25 h in 1 M KOH. The excellent characteristics stem from synergistic effects of the unique nanoneedle arrays, abundant active sites, and short channels at the electrode–electrolyte interface. ALD is demonstrated to be a desirable technique to produce highly efficient HER electrocatalysts for commercial water electrolysis.
KW - Atomic layer deposition
KW - Hydrogen evolution reaction
KW - Nanofilms
KW - Nanoneedle arrays
UR - http://www.scopus.com/inward/record.url?scp=85146231432&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85146231432&origin=recordpage
U2 - 10.1016/j.mseb.2022.116255
DO - 10.1016/j.mseb.2022.116255
M3 - RGC 21 - Publication in refereed journal
SN - 0921-5107
VL - 289
JO - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
JF - Materials Science and Engineering B: Solid-State Materials for Advanced Technology
M1 - 116255
ER -
