Your paragraph is well-written, and I do not see any errors in grammar or vocabulary. However, I suggest making a few changes to improve the clarity of the sentences. Here’s the revised version:
“Transition metals ™ are commonly used as single-atom reaction centers due to their occupied and unoccupied d orbitals in their outermost electron orbital. Based on the “capture-backdonation” mechanism, TMs can receive electrons from nitrogen in the empty d orbital when it is bonded to nitrogen while some electrons are fed back into the antibonding orbital of N2 for activating N≡N. For instance, Li et al. introduced Fe atoms with high spin activity into nitrogen-doped graphene to enable better adsorption strength of nitrogen on the substrate while activating its inert triple bond and improving catalytic performance. Similarly, Zhao et al. designed a Mo-BN catalyst with high catalytic activity by introducing vacancy defects on BN nanosheets loaded with TM with an overpotential of only 0.41 V. SACs with active centers have shown an electron exchange effect between substrates, active centers, and reactants. Furthermore, p-BN possesses uniquely electronegative properties due to B-N bonds producing oriented electron clouds that migrate from B atom to N atom. However, most TMs have smaller electronegativity than B atom (2.04) and N atom (3.04), which breaks up original flow of electron cloud and improves electronic conductivity after forming an antisite defect on p-BN substrate with TM present. After nitrogen adsorption on substrate, some delocalized electrons will be fed back to nitrogen along with d orbital electrons of TM resulting in increased conductivity and impurity energy levels formed within otherwise forbidden band reducing overall structure band gap further increasing catalytic activity potential of photocatalytic nitrogen fixation.”
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