In situ growth of a GDY–MnO_x heterointerface for selective and efficient ammonia production

Abstract

A heterostructured catalyst of GDY-MnOx was syntheiszed by controlled growth of MnOx on GDY. The incomplete charge-transfer between GDY and Mn atoms effectively increases the number of active sites, improves...

Graphdiyne/metal oxide hybrid materials for efficient energy and environmental catalysis

“…Compared with MnO 2 , the newly appeared peaks at 1382, 1589, 1912 and 2187 cm −1 corresponded to the D band, G band and alkynyl groups for GDY, respectively, which confirmed the successful synthesis of GDY/MnO x . 38 After the GDY was connected with MnO x , the obvious shift of the G band and conjugated diyne link modes towards higher wave numbers can be observed, indicating the strong chemical interaction (charge transfer or chemical bonding) between GDY and metal species. Besides, MnO x /GDY showed a larger I D / I G ratio than pure GDY, which indicated the increase of the defect sites after the combination of GDY and MnO x .…”

“…2a shows the in situ preparation process of the GDY–MnO x on a carbon cloth substrate. 38 Firstly, the GDY nanosheet was synthesized according to the previously reported Glaser–Hay coupling reaction. 40 Secondly, GDY–MnO x was synthesized via a one-step hydrothermal method.…”

Fe(TCNQ)2 nanorod arrays: an efficient electrocatalyst for electrochemical ammonia synthesis via the nitrate reduction reaction

“…The eight electron transfer process associated electrochemical NO 3 − reduction reaction (NO 3 RR) to NH 3 is regarded as a promising means of converting NO 3 − without causing secondary contamination. 15,27–34 Nevertheless, it is possible to mitigate the competitive hydrogen evolution reaction (HER) by designing a suitable electrocatalyst. Transition metal organic complexes, including cobalt phthalocyanine (CoPc), 35,36 copper phthalocyanine (CuPc), 10,37 and nickel phthalocyanine-based composites, 14,38,39 are regarded as promising electrocatalysts where the transition metal center is the active center of the electrochemical reduction reactions and organic ring phthalocyanine inhibits the competing HER.…”

Controlling the Metal–Ligand Coordination Environment of Manganese Phthalocyanine in 1D–2D Heterostructure for Enhancing Nitrate Reduction to Ammonia

“…Nitrogen in nitrate ions has an oxidation state of +5, which can form a number of nitrogenous products in oxidation states from +3 to −3, including nitrite (+3, NO 2 – ), nitric oxide (+2, NO), nitrous oxide (+1, N 2 O), nitrogen (0, N 2 ), hydroxylamine (−1, NH 2 OH), hydrazine (−2, N 2 H 4 ), and ammonia (−3, NH 3 ). ,− Development of numerous electrocatalytic systems using a variety of heterogeneous catalysts including Cu, Ag, Au, Rh, Ru, Ir, Pd, Pt, etc. often converts NO 3 – to N 2 via a five-electron transfer process. − Several research groups have also shown that electrochemically NO 3 – can be converted to hydroxylamine, nitrite, and hydrazine. − Electrocatalytic nitrate to ammonia conversion [NO 3 – + 6H 2 O + 8e – → NH 3 + 9OH – ] via an eight-electron transfer process using metal, nonmetal, and transition-metal-based electrocatalysts would be an alternative option for next-generation ammonia production. − The selectivity toward ammonia synthesis was unsatisfactory, and generally a broad range of products is obtained. This is due to the complexity of the process, strong competition from HER, and the production of various byproducts, which reduce the faradaic efficiency (FE) and selectivity of ammonia .…”