19 – 24 In a broader perspective, there is an increasing trend for the development of cost-effective metal-free catalysts, to substitute for noble metals.
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Highly effective sites and selectivity of nitrogen-doped graphene/CNT catalysts for CO<sub>2</sub> electrochemical reduction.
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The sentences
The active sites and reaction pathways are difficult to identify experimentally, though such an effort is highly significant for further improvement of product selectivity.