Real-time CO2 monitoring without batteries or external power

> The core of this new system is an "Inertia-driven Triboelectric Nanogenerator (TENG)" that converts vibrations (with amplitudes ranging from 20-4000 ㎛ and frequencies from 0-300 Hz) generated by industrial equipment or pipelines into electricity. This enables periodic CO2 concentration measurements and wireless transmission without the need for batteries.

Ingenious, I love it.

I was thinking would there be a passive chemical alternative, something that changed color according to CO2 level. Kind of: https://en.wikipedia.org/wiki/Bicarbonate_indicator

anyone can explain why this is such a big breakthrough?

vibration powered electricity generator is not new, neither is CO2 monitoring. so what's the big deal?

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Tangential/Spoiler: I came to know about Kaist (Korea Advanced Institute of Science & Technology) in the Netflix series Devil's Plan (season 2) which had two of its students as the top three contestants.