TY - JOUR
T1 - Crystalline-amorphous interface of mesoporous Ni2P @ FePOxHy for oxygen evolution at high current density in alkaline-anion-exchange-membrane water-electrolyzer
AU - Meena, Abhishek
AU - Thangavel, Pandiarajan
AU - Jeong, Da Sol
AU - Singh, Aditya Narayan
AU - Jana, Atanu
AU - Im, Hyunsik
AU - Nguyen, Duc Anh
AU - Kim, Kwang S.
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/6/5
Y1 - 2022/6/5
N2 - For industrial high-purity hydrogen production, it is essential to develop low-cost, earth-abundant, highly-efficient, and stable electrocatalysts which deliver high current density (j) at low overpotential (η) for oxygen evolution reaction (OER). Herein, we report an active mesoporous Ni2P @ FePOxHy pre-electrocatalyst, which delivers high j = 1 A cm−2 at η = 360 mV in 1 M KOH with long-term durability (12 days), fulfilling all the desirable commercial criteria for OER. The electrocatalyst shows abundant interfaces between crystalline metal phosphide and amorphous phosphorus-doped metal-oxide, improving charge transfer capability and providing access to rich electroactive sites. Combined with an excellent non-noble metal-based HER catalyst, we achieve commercially required j = 500/1000 mA cm−2 at 1.65/1.715 V for full water-splitting with excellent stability in highly corrosive alkaline environment (30% KOH). The alkaline-anion-exchange-membrane water-electrolyzer (AAEMWE) fabricated for commercial viability exhibits high j of 1 A cm−2 at 1.84 V with long-term durability as an economical hydrogen production method, outperforming the state-of-the-art Pt/C–IrO2 catalyst.
AB - For industrial high-purity hydrogen production, it is essential to develop low-cost, earth-abundant, highly-efficient, and stable electrocatalysts which deliver high current density (j) at low overpotential (η) for oxygen evolution reaction (OER). Herein, we report an active mesoporous Ni2P @ FePOxHy pre-electrocatalyst, which delivers high j = 1 A cm−2 at η = 360 mV in 1 M KOH with long-term durability (12 days), fulfilling all the desirable commercial criteria for OER. The electrocatalyst shows abundant interfaces between crystalline metal phosphide and amorphous phosphorus-doped metal-oxide, improving charge transfer capability and providing access to rich electroactive sites. Combined with an excellent non-noble metal-based HER catalyst, we achieve commercially required j = 500/1000 mA cm−2 at 1.65/1.715 V for full water-splitting with excellent stability in highly corrosive alkaline environment (30% KOH). The alkaline-anion-exchange-membrane water-electrolyzer (AAEMWE) fabricated for commercial viability exhibits high j of 1 A cm−2 at 1.84 V with long-term durability as an economical hydrogen production method, outperforming the state-of-the-art Pt/C–IrO2 catalyst.
KW - Electrocatalysts
KW - Energy conversion
KW - High current density
KW - Oxygen evolution reaction
KW - Water-electrolyzer
UR - http://www.scopus.com/inward/record.url?scp=85123612744&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2022.121127
DO - 10.1016/j.apcatb.2022.121127
M3 - Article
AN - SCOPUS:85123612744
SN - 0926-3373
VL - 306
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 121127
ER -