TY - JOUR
T1 - Experimental and Theoretical Investigation of Reconstruction and Active Phases on Honeycombed Ni3N-Co3N/C in Water Splitting
AU - Huang, Chao
AU - Zhang, Biao
AU - Wu, Yuzheng
AU - Ruan, Qingdong
AU - Liu, Liangliang
AU - Su, Jianjun
AU - Tang, Yunqi
AU - Liu, Rugeng
AU - Chu, Paul Kim Ho
PY - 2021/11/15
Y1 - 2021/11/15
N2 - Honeycombed Ni3N-Co3N decorated with carbon speckles (Ni3N-Co3N/C) is prepared on nickel foam as a potent, economical, and durable water-splitting catalyst. The Ni3N-Co3N/C system has excellent properties in the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), such as low overpotentials of 320/175 mV at 100 mA cm−2, small Tafel slopes of 55.2/70.2 mV dec−1, as well as excellent stability for over 7 days. To demonstrate the commercial practicality, an overall water splitting cell composed of the bifunctional Ni3N-Co3N/C catalyst as both the anode and cathode is assembled and can be driven by a standard 1.5 V battery. Based on experimental and theoretical results obtained by in situ Raman scattering, ex situ XPS, and density-functional theory, the precise effects of the active sites and conductivity, roles of Ni3N, Co3N, and C, and reaction mechanism in HER and OER, are investigated and described.
AB - Honeycombed Ni3N-Co3N decorated with carbon speckles (Ni3N-Co3N/C) is prepared on nickel foam as a potent, economical, and durable water-splitting catalyst. The Ni3N-Co3N/C system has excellent properties in the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), such as low overpotentials of 320/175 mV at 100 mA cm−2, small Tafel slopes of 55.2/70.2 mV dec−1, as well as excellent stability for over 7 days. To demonstrate the commercial practicality, an overall water splitting cell composed of the bifunctional Ni3N-Co3N/C catalyst as both the anode and cathode is assembled and can be driven by a standard 1.5 V battery. Based on experimental and theoretical results obtained by in situ Raman scattering, ex situ XPS, and density-functional theory, the precise effects of the active sites and conductivity, roles of Ni3N, Co3N, and C, and reaction mechanism in HER and OER, are investigated and described.
KW - Water splitting
KW - Ni3N-Co3N/C
KW - Interface effect
KW - Surface reconstruction
UR - http://www.scopus.com/inward/record.url?scp=85109452213&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85109452213&origin=recordpage
U2 - 10.1016/j.apcatb.2021.120461
DO - 10.1016/j.apcatb.2021.120461
M3 - RGC 21 - Publication in refereed journal
SN - 0926-3373
VL - 297
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 120461
ER -
