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Single‐atom catalysts exhibit superior CO2‐to‐CO catalytic activity, but poor kinetics of proton‐coupled electron transfer (PCET) steps still limit the overall performance toward the industrial scale. Here, we constructed a Fe−P atom paired catalyst onto nitrogen doped graphitic layer (Fe1/PNG) to accelerate PCET step. Fe1/PNG delivers an industrial CO current of 1 A with FECO over 90 % at 2.5 V in a membrane‐electrode assembly, overperforming the CO current of Fe1/NG by more than 300 %. We also decrypted the synergistic effects of the P atom in the Fe−P atom pair using operando techniques and density functional theory, revealing that the P atom provides additional adsorption sites for accelerating water dissociation, boosting the hydrogenation of CO2, and enhancing the activity of CO2 reduction. This atom‐pair catalytic strategy can modulate multiple reactants and intermediates to break through the inherent limitations of single‐atom catalysts. [ABSTRACT FROM AUTHOR]

Nitrite (NO 2 −) is present in a variety of foods, but the excessive intake of NO 2 − can indirectly lead to carcinogenic, teratogenic, mutagenicity and other risks to the human body. Therefore, the detection of NO 2 − is crucial for maintaining human health. In this study, an integrated array sensor for NO 2 − detection is developed based on molybdenum single atom material (IMS Mo-SAC) using high-resolution electrohydrodynamic (EHD) printing technology. The sensor comprises three components: a printed electrode array, multichannels designed on polydimethylsiloxane (PDMS) and an electronic signal process device with bluetooth. By utilizing Mo-SAC to facilitate electron transfer during the redox reaction, rapid and efficient detection of NO 2 − can be achieved. The sensor has a wide linear range of 0.1 μM–107.8 mM, a low detection limit of 33 nM and a high sensitivity of 0.637 mA−1mM−1 cm−2. Furthermore, employing this portable array sensor allows simultaneously measurements of NO 2 − concentrations in six different foods samples with acceptable recovery rates. This array sensor holds great potential for detecting of small molecules in various fields. [ABSTRACT FROM AUTHOR]

• Atomically dispersed Ni (A-Ni-NG) electrocatalyst was developed for dechlorination. • A-Ni-NG exhibited highest activities to dechlorination of chloroacetic acids (CAAs). • High activity of A-Ni-NG stems from its specific interactions with intermediate. • The Cl atoms in CAAs are eliminated sequentially through a direct mechanism. • Electron transfer step occurs in a stepwise manner with breaking C–Cl bond. Electrochemical dechlorination offers a promising strategy to convert refractory chlorinated organic pollutants (COPs) to biodegradable chlorine-free organics under mild conditions. In this work, we report atomically dispersed nickel anchored on nitrogenated graphene (A-Ni-NG) as an efficient dechlorination catalyst, and study its underlying dechlorination pathway and catalytic mechanism, using chloroacetic acids (CAAs) as the model COPs. The A-Ni-NG exhibits higher catalytic activity than state-of-the-art Pd and Ag catalysts. Using A-Ni-NG as a catalyst, complete dechlorination of CAAs to acetic acid can be achieved at pH 3, 7 and 11. The Cl atoms in CAAs are eliminated sequentially through a direct dechlorination mechanism. The exceptional electrocatalytic activity of A-Ni-NG stems from the specific interactions between A-Ni-NG and the substrate as well as the primary intermediate generated from the first electron transfer (ET) step, and the ET step occurs in a stepwise manner with breaking C Cl bond. [ABSTRACT FROM AUTHOR]