【摘 要】
：
Development of active and non-noble metal-based catalyst for H2 production via NH3 decomposition is crucial for the implementation of NH3 as a H2 carrier. Co-based catalysts have received increasing at-tention because of its high intrinsic activity and mo
【机 构】
：
Dalian Institute of Chemical Physics,Dalian National Laboratory for Clean Energy,Chinese Academy of
论文部分内容阅读
Development of active and non-noble metal-based catalyst for H2 production via NH3 decomposition is crucial for the implementation of NH3 as a H2 carrier. Co-based catalysts have received increasing at-tention because of its high intrinsic activity and moderate cost. In this work, we examined the effect of BaNH, CaNH and Mg3N2 on the catalytic activity of Co in the NH3 decomposition reaction. The H2 forma-tion rate ranks the order as Co-BaNH > Co-CaNH > Co-Mg3N2 ≈ Co/CNTs within a reaction temperature range of 300–550 ℃. It is worth pointing out that the H2 formation rate of Co-BaNH at 500 ℃ reaches 20 mmolH2 gcat–1 min–1, which is comparable to those of the active Ru/Al2O3 (ca. 17 mmolH2 gcat–1 min–1) and Ru/AC (21 mmolH2 gcat–1 min–1) catalysts under the similar reaction conditions. In-depth research shows that Co-BaNH exhibits an obviously higher intrinsic activity and much lower Ea (46.2 kJ mol–1) than other Co-based catalysts, suggesting that BaNH may play a different role from CaNH, Mg3N2 and CNTs during the catalytic process. Combined results of XRD, Ar-TPD and XAS show that a [Co–N–Ba]-like intermediate species is likely formed at the interface of Co metal and BaNH, which may lead to a more energy-efficient reaction pathway than that of neat Co metal for NH3 decomposition.
其他文献
O3-type NaNiO2-based cathode materials undergo irreversible phase transition and serious capacity decay at high voltage above 4.0 V in sodium-ion batteries.To address these challenges,effects of F-substitution on the structure and electrochemical performa
Raman probing of carbon electrode and electrolyte under dynamic conditions is performed here using different aqueous electrolytes to elucidate the fundamental events occurring in electrochemical superca-pacitor during charge-discharge processes.The areal
The approach of substituting electrochemically active with inactive elements has widely been used to improve the electrochemical performance of Li-rich intercalation cathode materials.This especially is true for Li-rich compounds where almost all of the L
As a substitute for synthetic ammonia under mild condition,electrocatalytic nitrogen reduction reaction(NRR)provides a hopeful approach for the development of ammonia.Nevertheless,the current develop-ment of NRR electrocatalysts is far from enough and a s
An experimental investigation of the crystallographic,Raman and transport properties of the Ce1-x(Nd0.74Tm0.26)xO2-x/2(0.1≤x≤0.6)doped ceria system was performed with the aim of setting out correlations between structural features and ionic conductivity o
Electrocatalytic nitrogen reduction reaction (NRR) at ambient conditions holds great promise for sustain-ably synthesizing ammonia (NH3), while developing highly-efficient, long-term stable, and inexpensive catalysts to activate the inert N≡ N bond is a k
The conventional Li–O2 battery (LOB) has hardly been considered as a next-generation flexible electronics thus far, since it is bulk, inflexible and limited by the absence of an adjustable cell configuration. Here, we present a flexible Li–O2 cell using N
Several challenging issues, such as the poor conductivity of sulfur, shuttle effects, large volume change of cathode, and the dendritic lithium in anode, have led to the low utilization of sulfur and hampered the commercialization of lithium–sulfur batter
For the applications of aqueous Li-ion hybrid capacitors and Na-ion hybrid capacitors, potassium ions are pre-inserted into MnO2 tunnel structure, the as-prepared K1.04Mn8O16 materials consist of nanoparticles and nanorods were prepared by facile high-tem