Stable, Efficient, Copper Coordination Polymer-Derived Heterostructured Catalyst for Oxygen Evolution under pH-Universal Conditions

Abstract

The constructure of a heterostructured interface is an effective way to design highly durable and efficient water oxidation electrocatalysts. Herein, Cu/CuCN with heterointerfaces is the first synthesized case through a simple epitaxial-like growth method, displaying superior activity and stability under pH-universal media. Associated with high electron transport and transfer of the epitaxial interfacial area, the Cu/CuCN pre-catalyst is applied to deliver the oxygen evolution reaction (OER) with lower overpotentials of 250 mV (forward scan) and 380 mV (backward scan) at 10 mA cm –2 and demonstrates better intrinsic activity ( j ECSA of 1.0 mA cm –2 at 420 mV) and impressive stability (136 h) in 1.0 M KOH, which exceeds most previous catalysts. Even using a nominal voltage of 1.5 V of a AA battery can drive the overall water-splitting setup. Experiments combined with theoretical simulations further uncover the existence of CuO species at the heterointerface during basic OER, which is evidence of better OER performance with abundant active sites that accelerate the conversion kinetics.

Selective Cu and Ni-MOFs as pre-catalysts for the hydrogenation of furfural to furfuryl alcohol

“…The binding energy values were consistent with the literature values for Cu 2+ compounds. 56–58 The Ni 2p XPS spectra for MOF 2 also depicted the binding energies peaks of Ni 2p 1/2 and Ni 2p 3/2 at 873.7 eV and 856.2 eV, respectively. The two visible shake-up satellites for Ni 2p orbitals levels which were attributed to Ni 2+ , close to values reported for other Ni 2+ species.…”

NiMo-MOF-Derived Carbon-Armored Ni4Mo Alloy of an Interwoven Nanosheet Structure as an Outstanding pH-Universal Catalyst for Hydrogen Evolution Reaction at High Current Densities

“…In addition to cost, activities, and stability, application convenience is also a worthy noting factor to consider for catalyst design. There are a wide range of water electrolysis technologies developed for hydrogen production, including alkaline and acidic electrolyte-based solution electrolysis, − anion exchange membrane electrolysis, proton exchange membrane electrolysis, and microbial electrolysis, covering reaction environments from acidic to neutral and to alkaline. − Developments of pH-universal catalysts would be advantageous for further advancement of the electrolytic water splitting technology …”

An unusual zig-zag 2D copper(i) coordination polymer as an outstanding catalyst for azide–alkyne “click” chemistry at room temperature

“…Among CPs, copper coordination polymers (CuCPs) have recently emerged as efficient materials for various applications such as gas storage, 4,5 sensing 6–8 and catalysis. 9,10 Especially in the last two decades, CuCPs have attracted considerable interest as heterogeneous catalysts for various organic reactions due to their low cost, low toxicity, straight-forward preparation, high tolerance to solvents, good thermal stability, recyclability and high catalytic activity. 11,12 The ease of recovery from the reaction mixture and recyclability provide particular advantages over homogenous counterparts.…”