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Niobium pentoxide (Nb2O5) is a promising heterogeneous acid catalyst because of its water‐tolerant acidity. However, the reactivity of Nb2O5 is limited to the surface of a bulk material; thus, its catalytic activity is generally lower than homogeneous catalysts. Nano‐sized Nb2O5 shows superior activity but has low stability and recoverability. We develop spiky‐shaped Nb2O5 composed of radially grown...
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