Advancing metal cluster-based electrocatalysis for C–N synthesis

Advancing metal cluster-based electrocatalysis for C–N synthesis

Electricity could offer a different route to nitrogen-containing chemicals used in agriculture, healthcare and manufacturing. Electrochemical systems can bring carbon-bearing and nitrogen-bearing feedstocks together at an electrode, potentially reducing dependence on conventional heat-intensive steps. Yet making the intended C–N bond remains difficult: reactive fragments must meet in the correct arrangement before competing reactions consume electrons or redirect the starting materials into unwanted products.

Research on few-atom metal ensembles suggests a way to address this selectivity challenge. This review examines atomic clusters whose neighboring atoms provide distinct positions for activating reactants, unlike isolated single-atom sites or the varied surfaces of larger particles. It surveys preparation methods, cluster composition, protective ligands, interactions with supports, reaction pathways and performance measurements. Applications discussed include electrochemical formation of oximes, urea, amino acids, amines and amides, alongside related investigations of NH₃ synthesis through N₂ reduction, which does not create a C–N bond.

The collected evidence identifies four roles for carefully designed cluster structures: (1) bringing carbon-derived and nitrogen-derived fragments into proximity on the same catalytic surface so they can couple; (2) redistributing charge among nearby metal atoms to influence adsorption and intermediate stability; (3) balancing protective ligands and anchoring supports to preserve active sites without blocking reactants; and (4) directing proton and electron transfer toward targeted products rather than H₂ evolution or separate reduction pathways. These functions vary across compositions and operating conditions, so a promising result for one cluster cannot automatically be generalized to another reaction.

Although published studies describe encouraging catalytic behavior, the authors emphasize that no single performance figure establishes practical usefulness. Faradaic efficiency, production rate, current density, operating voltage and durability all require consideration. A cluster that appears precise before a test may rearrange, dissolve or aggregate when electrolysis begins, obscuring the identity of the working catalyst. The review therefore prioritizes measurements performed during operation, isotope-labeling experiments that establish the sources of incorporated atoms and reproducible comparisons between laboratories. Future progress will also depend on reliable production of clusters, secure attachment to conductive electrodes, adequate feedstock delivery and realistic assessments of cost and energy use. Rather than presenting a newly demonstrated manufacturing process, the article provides a research framework for developing electricity-powered synthesis that is more selective, durable and scalable. The results were published in Chinese Journal of Catalysis (DOI: 10.1016/S1872-2067(26)65185-6)

About the Journal

Chinese Journal of Catalysis is co-sponsored by Dalian Institute of Chemical Physics, Chinese Academy of Sciences and Chinese Chemical Society, and it is currently published by Elsevier group. This monthly journal publishes in English timely contributions of original and rigorously reviewed manuscripts covering all areas of catalysis. The journal publishes Reviews, Accounts, Communications, Articles, Highlights, Perspectives, and Viewpoints of highly scientific values that help understanding and defining of new concepts in both fundamental issues and practical applications of catalysis. Chinese Journal of Catalysis ranks among the top six journals in Applied Chemistry with a current SCI impact factor of 17.2. The Editors-in-Chief are Profs. Can Li and Tao Zhang.

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